Ford OBD/OBD2 Codes

Accessing Ford OBD1 Trouble Codes

Using Analog Voltmeter

Exc. EEC-V, DI 7.3L Turbo Diesel & Villager

Connect analog voltmeter to data link connector located in engine compartment. When a diagnostic trouble code is reported on the analog voltmeter for a functional test, it will represent itself as a pulsing or sweeping movement of the voltmeter’s needle across the dial face. Accessing diagnostic trouble codes. Use the Analog voltmeter or Test light method, not both.

Using Check Engine/ MIL

Exc DI 7.3L Turbo Diesel, Merkur (2.9L), Villager & 85–88 2.3L Engine

The MIL lamp is intended to alert the driver of certain malfunctions in the engine control system. If such a fault occurs, the EEC-IV processor will substitute a value or values and continue operating. In some cases this action may result in a slight change in vehicle driveability. The Check Engine lamp can be used to read DTCs. The instrument panel Check Engine lamp will remain on when a hard fault is present. During the Self test sequence, a DTC is reported by the Check Engine lamp. It will represent itself as a flash on the Check Engine lamp display on the instrument panel. A single digit number of three will be reported by three flashes. However, as previously stated, a DTC is represented by a two digit number, such as 2–3. As a result, DTC 2–3 will appear on the Check Engine lamp display as two flashes, then after a two second pause, the lamp will flash three times. DTC interpretation. Check engine lamp Continuous Memory DTCs are separated from Key On Engine Off DTCs by a six second delay, a single half second flash, then another six second delay.

Villager

1. Disconnect Diagnostic Test Connector (DTC) located on LH side of engine compartment, on transaxle behind coolant reservoir.
2. Using suitable jumper wire, jump BL/W and GY/BL wires.

Accessing DTCs. MIL

1. Wait about two seconds.
2. Remove jumper wire and reconnect DTC.
3. Record DTCs by reading MIL flashes.

Using Message Center

Continental

1. Using electronic instrument cluster, hold in all three buttons (select, checkout and reset buttons) at same time.
2. To conduct Key-ON/Engine-OFF (KOEO) Self test portion, hold in all three buttons and turn ignition On, then release three buttons.
3. To conduct Key-ON/Engine-Running (KOER) Self test portion, hold in all three buttons, turn ignition On and release three buttons.
4. On 87–90 models, press select button three times
5. On 91–95 models, depress gauge select button three times until ‘‘DEALER 4’’ is displayed.
6. On all models, to initiate Self test, using a jumper wire, jump self test connectors STI to SIG RTN.

Accessing DTCs. Message center See Image above

1. On 87–90 models, a base readout of 4255 indicates that KOEO self test has been entered.
2. On 87–90 models, a base readout of 4030 indicates engine running self test has been entered.
3. On 87–90 models, DTC output will be the RH three digits displayed. Service pass code is 4011.
4. On 91–97 models, DTCs will be displayed on message center.
5. On all models, to exit Self test, turn ignition Off.

Using Overdrive Cancel/Transmission MIL (OCIL/TMIL)

On 89–98 models equipped with 7.3L diesel engine and E4OD transmission, perform KOEO Self Test if the OCIL/TMIL lamp flashes. The lamp stays off when OSC is toggled once to indicate vehicle can attain overdrive gear position. The lamp stays on when OSC is toggled to prevent vehicle from shifting into overdrive position. DTC 99 indicates a fault in the E4OD transmission Electronic Pressure Control (EPC) circuit. Under this condition, the lamp serves as the Transmission Malfunction Indicator Lamp (TMIL).

Clearing Codes

Except MCU System

EEC-V & DI 7.3L Turbo Diesel

The PCM can be reset using the New Generation Star (NGS) Tester or by disconnecting the battery ground cable for five minutes. If the battery ground cable was disconnected to clear DTCs, the vehicle may operate rough for the first few miles until adaptive values are relearned.

EEC-IV Continuous Memory

1. Perform KOEO self test. 2. When DTCs begin to display, deactivate self test as follows:

a. STAR tester, position center button in up position. b. Analog Volt/Ohmmeter, remove jumper wire from self test input connector and signal return pin of self test connector. c. NGS tester, depress STOP button. d. Check engine lamp, remove jumper wire from self test input connector and signal return pin of self test connector. e. Message center, remove jumper wire from self test input connector and signal return pin of self test connector. f. OCIL, remove jumper wire from self test connector and signal return pin of self test connector.

3. Continuous DTCs should now be erased.

Keep Alive Memory (KAM)

To clear keep alive memory, disconnect and isolate negative battery cable for a minimum of five minutes. After clearing memory, it is necessary to drive vehicle a minimum of 10 miles to allow processor time to relearn value.

Merkur 2.9L & 85–88 2.3L Engine

1. Initiate KOEO self test. 2. Remove jumper wire from self test input terminal as soon as first diagnostic trouble code is received (even if an 11 is the first DTC). 3. Repeat self test with jumper wire to verify DTCs have been erased.

Aspire, Capri (1.6L), Escort & Tracer (1.8L), Probe (2.0L w/4EAT, 2.2L & 2.5L) & 88–93 Festiva

1. Initiate KOEO self test. 2. Unlatch push button on Super Star II Tester as soon as first diagnostic trouble code is received. 3. Disconnect and isolate battery ground cable, then depress brake pedal for 5–10 seconds. 4. Conduct self test to ensure DTCs have been erased.

Villager

Except Malfunction Indicator Lamp DTCs may be erased using one of two methods. Disconnect battery ground cable, DTCs will be erased from back-up memory after 24 hours. When using NGS tester, select Diagnostic Test Mode Results, then depress CLEAR. Malfunction Indicator Lamp 1. Activate diagnostic test mode. 2. Disconnect DTC. 3. Using suitable jumper wire, jump BL/W and GY/BL wires. 4. Wait about two seconds. 5. Remove jumper wire and reconnect DTC. 6. MIL will stay on, and DTCs will be erased.

MCU System

To clear DTCs, turn ignition Off. MCU system does not have KAM to retain service DTCs

Also see this page EEC IV Diagnostic page for more Ford information.

Ford Trouble Codes By Year

88-95	1.3L EFI, 1.6L, 1.8L, 2.0L w/4EAT & 2.5L
93-95	probe
93-95	EEC Villager
96-97	1.3L EFI, 1.8L & 2.5L
96-01	OBD2/MIL
96-present	Full OBD2 Generic Codes
EEC	1.3L FBC Engine exc. Villager
EEC-IV	EEC-IV/OBD2
EEC-V	EEC-V/OBD2
MCU	MCU
7.3L Turbo Diesel	7.3L Turbo Diesel

(R) = Engine Running test (M) = Memory code  (O)=Key On Engine Off test

Ford OBD1 Codes
		2 Digit Codes
11		System OK
12		Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too low) – ISC
13	(O)	ISC did not respond properly (extends to touch throttle then retracts for KOEO) – ISC
	(R)	Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too high)
	(M)	ISC sticking, open ITS circuit or TP sticking
14		Ignition pickup (PIP) was erratic – Ignition Systems
		E4OD Transmission diesel RPM sensor – Diesel RPM sensor
15	(O)	No Keep Alive Memory power to PCM pin 1 or bad PCM (Memory Test Failure)
	(M)	KAM (pin 1) was interrupted (was battery disconnected ?)
16		1 9L & 2 5L – Throttle stop set too high – IDLE or Idle Set Procedures
		2 3L – RPM’s too low – IDLE
	(O)	Electronic ignition – IDM circuit fault – Ignition Systems
17		1 9L & 2 5L – Throttle stop set too low – IDLE
18	(R)	Check base timing & advance function – Timing Tests
	(M)	Ignition TACH signal erratic – Ignition Systems
		Spark Angle Word (SAW) circuit failure (1 9L SFI)
19	(O)	No Vehicle Power (pins 37 + 57) or bad PCM VPWR Diagnosis
	(R)	Erratic idle during test (reset throttle & retest) – Idle Set Procedures
		Electronic ignition Cylinder ID sensor/circuit problem – Ignition Systems
21		Engine Coolant Temperature (ECT) sensor out of range – ECT
22		MAP (vacuum) or BARO signal out of range – MAP
23		Throttle sensor out of range or throttle set too high – TPS
24		Intake Air Temperature (IAT) or Vane Air Temperature (VAT) sensor out of range – IAT VAT
25		Knock sensor not tested (ignore if not pinging) – KS
26		Mass Air Flow (MAF) or Vane Air Flow (VAF) out of range – MAF VAF
		Transmission Oil Temperature (TOT) sensor out of range, Transmissions
27		Vehicle Speed Sensor problem – VSS
28		Vane Air Temperature (VAT) sensor out of range – VAT
		2 3L w/Electronic Ignition – Cyl ID, IDM low or right coil pack failure – Ignition Systems
29		Vehicle Speed Sensor problem – VSS
31	(O,R,M)	EVP – EVP signal is/was out of range – EVP
	(O,R,M)	EVR – EVP signal is/was low – EVR
	(O,R,M)	PFE – PFE signal is/was low – PFE
32	(R)	EVP – EGR not responding properly during test – EVP
	(O,R,M)	EVR – EVP signal is/was low – EVR
	(R,M)	PFE – PFE shows low pressure, EGR not seating or memory, not   seating   intermittently – PFE
33	(O,M)	ALL – EGR did not open/ respond during test or if memory code, did not open intermittently – EVP EVR PFE
34	(R)	EVP – EGR did not respond properly during test – EVP
	(O,R,M)	EVR – EVP sensor is/was high – EVR
	(O,R,M)	PFE – PFE sensor is/was out of range – PFE
35	(R)	EVP – Engine RPM’s too low to test EGR system – EVP
	(O,R,M)	EVR – EVP sensor signal is/was high – EVR
	(O,R,M)	PFE – PFE sensor signal is/was high – PFE
38		Idle Tracking Switch signal was intermittent – ISC
39		Transmission Torque Converter clutch not engaging – Transmissions
41	(R)	System lean – Fuel control
	(M)	System was lean for 15 seconds or more (no HO2S switching) – Fuel control
42	(R)	System rich – Fuel control
	(M)	System was rich for 15 seconds or more (no HO2S switching) – Fuel control
43	(R)	HO2S sensor not reading (run at 2000 rpm’s for 2 minutes and retest – check  for HO2S switching)
	(M)	Was lean at WOT for 3 seconds or more – Fuel control
44		AIR system inoperative – Air Injection
45		AIR not Diverting (AIRD) – Air Injection
		Electronic Ignition – coil primary circuit failure – Ignition Systems
46		AIR Bypass (AIRB) not working – Air Injection
		Electronic Ignition – primary circuit failure coil 2 – Ignition Systems
47		Low flow unmetered air (check for small vacuum leaks, injector o’rings, gaskets etc )
		E4OD transmission 4×4 switch/circuit problem – Transmissions
48		High flow unmetered air (check for large vacuum leak, inlet hoses etc )
		Electronic Ignition – coil primary circuit failure – Ignition Systems
49		Electronic Ignition – spout signal circuit problem – Ignition Systems
		Transmission 1/2 shift problem – Transmissions
51		Engine Coolant Temperature (ECT) sensor signal is/was too high – ECT
52		Power Steering Pressure Switch/circuit open – PSP
	(R)	Did you turn wheel during test ?
53		Throttle Position sensor too high – TPS
54		Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal high – IAT VAT
55		No or low (under 7 5 V) Key Power to PCM pin 5
56		Vane Air Flow (VAF) or Mass Air Flow (MAF) sensor high – VAF MAF
		Transmission Oil Temperature sensor too high – Transmissions
57		Intermittent in Park/Neutral/ Switch or Neutral Pressure switch circuit – PNP or Transmissions
58		Idle Tracking Switch (ITS) signal problem ISC
		Vane Air Temperature (VAT) sensor out of range or open – VAT
59		AXOD 4/3 circuit fault – Transmissions
		3 0L SHO – Low speed fuel pump circuit problem – Power / Fuel Pump Circuits
		Transmission 2/3 shift problem – Transmissions
61		Engine Coolant Temperature (ECT) sensor is or was too low – ECT
62		AXOD (KOEO only) 3/2 circuit short to ground – Transmissions
		AXOD (KOEO AND KOER) 4/3 circuit failure – Transmissions
		E4OD excessive converter clutch slippage – Transmissions
63		Throttle Position Sensor (TPS) signal too low TPS
64		Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal low or grounded – IAT VAT
65		Check intermittent HO2S (signal or ground) – Fuel Control
	(R)	E4OD truck – cycle OD cancel switch after engine ID is received – Transmissions
		1984 3 8L ONLY – O, M Battery voltage high (check for electrical system overcharging)
66		Vane Air Flow (VAF) or Mass Air Flow (MAF) signal low – VAF MAF
		Transmission Oil Temperature (TOT) signal low (possibly grounded) – Transmissions
67		Park/Neutral circuit fault – PNP
		Transmission Manual Lever Position (MLP) sensor circuit – Transmissions
	(M)	Intermittent Park Neutral Position (PNP) sensor fault – PNP
68		Idle Tracking Switch (ITS) circuit (possibly grounded) – ISC
		Vane Air Temperature (VAT) sensor out of range or grounded – VAT
		3 8L AXOD -Transmission Temperature Switch (TTS) open – Transmissions
		Electronic Transmission – Transmission Oil Temperature (TOT) sensor was overheated -Transmissions
69		AXOD transmission (O) 3/2 switch closed (possible short circuit) – Transmissions
		AXOD (M) 3/2 switch open (poss short to power) – Transmissions
		E4OD 3/4 shift problem – Transmissions
70	(M)	3 8L AXOD – Data link to instrument cluster fault Service any other EEC codes, erase memory and retest   If code is still present refer to instrument cluster diagnosis manual
71	(M)	1 9L TBI, 2 3L TBI, 2 5L TBI – ITS signal was grounded when throttle should have been opening  ITS-ISC ISC motor problem or Idle Tracking Switch (ITS) signal wire shorted to  ground – ISC
	(M)	1 9L MFI – PCM re-initialized  Possible electrical noise, case ground or intermittent  VPWR problem – VPWR Diagnosis
	(M)	3 8L AXOD – Data link to instrument cluster fault – See code 70
72	(R)	No MAP or MAF change in “goose” test – retest, check for frequency or   voltage change – MAP MAF
	(M)	1 9L MFI – VPWR circuit to PCM was intermittent – VPWR Diagnosis
	(M)	2 3L T/C – PCM re-initialized  Possible electrical noise, case ground or  intermittent VPWR problem – VPWR Diagnosis
	(M)	3 8L AXOD – Message center data link circuit fault – See code 70
73	(O)	Rerun test, if 73 is still output replace TPS
	(R)	No Throttle Position Sensor (TPS) change in “goose” test  Must get at least 25% throttle rotation – TPS
74		Was brake depressed after engine ID was received ?
		Brake On Off (BOO) signal open or short to ground – BOO
75		Brake On Off (BOO) signal shorted to power – BOO
76		Vane Air Flow (VAF) did not respond to “goose” test – VAF
77		System did not receive “goose” test – see TESTS
78	(M)	VPWR circuit to PCM was intermittent or the PCM is bad VPWR Diagnosis
79		A/C is on or pin 10 is shorted to power
81		Boost control solenoid – Solenoids
		AIRD solenoid – Solenoids and Air Injection
		3 0L SHO – Inlet Air Solenoid – Solenoids
82		2 3L TC – Fan Control wire shorted to ground – A/C and Fan Circuits
		AIRB solenoid – Solenoids and Air Injection
		3 8L SC – Super Charger Bypass Solenoid – Solenoids
83		High Electro Drive Fan circuit fault – A/C and Fan Circuits
		EGR Control solenoid – Solenoids
		3 0L SHO – Low Speed Fuel Pump Relay circuit – Power / Fuel Pump Circuits
84		EGR Vacuum Regulator – Solenoids
		EGR cutoff solenoid – Solenoids
		EGR Vent solenoid – Solenoids
85		2 3L T/C Automatic – 3/4-4/3 Shift solenoid – Transmissions
		CANP solenoid (ALL 1989) – Solenoids
	(M)	1 9L MFI – System has corrected rich condition – Fuel control
86		2 3L or 2 9L Truck – A4LD 3/4 shift solenoid – Transmissions
		(M) 1 9L MFI – System has corrected lean condition – Fuel control
87	(O)	Fuel pump circuit fault (check inertia switch) – Power / Fuel Pump Circuits
		Vehicles with 2BBL carb – Temperature Compensated Accelerator Pump  Solenoid – Solenoids (M) intermittent in fuel pump primary circuit – Power / Fuel  Pump Circuits NOTE: On some Escorts with automatic seat belts this code is normal IN MEMORY due to the wiring
88		Throttle Kicker Solenoid – Solenoids
		Variable Voltage Choke relay circuit fault – VVC
		Fan Control circuit fault – A/C and Fan Circuits
		A4LD – Converter Clutch Override solenoid – Transmissions
		Electronic Ignition – IDM, DPI or spout circuit fault – Ignition Systems
89		A4LD – Converter Clutch Override solenoid – Transmissions
		AXOD Torque Converter Control solenoid circuit – Transmissions
		Exhaust Heat Control (heat riser) solenoid circuit – Solenoids
91	(R, M)	System running lean – Fuel control
		Transmission SS 1 circuit/solenoid problem – Transmissions
92	(R)	System running rich – Fuel control
		Transmission SS 2 circuit/solenoid problem – Transmissions
93	(O,R)	Throttle linkage binding or bad ISC motor ISC HO2S not reading Fuel control
		Transmission TCC circuit/solenoid problem – Transmissions
94		AIR system inoperative – Air Injection
		Transmission TCC circuit/solenoid problem – Transmissions
95	(O)	Fuel pump: open, bad ground or always on – Power / Fuel Pump Circuits
	(R)	AIR not Diverting (AIRD) – Air Injection
	(M)	Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM  (Fuel Pump Monitor signal) – Power / Fuel Pump Circuits
96	(O)	Fuel pump monitor circuit shows no power – Power / Fuel Pump Circuits
	(R)	AIR Bypass (AIRB) not working – Air Injection
	(M)	(Service 87 code first if present) Fuel pump relay or battery power feed was open – Power / Fuel Pump Circuits
97		E4OD OD cancel light circuit failure – Transmissions
98	(R)	Did not pass KOEO yet (Get 11 in KOEO first)
		Transmission EPC circuit/solenoid failure – Transmissions
99	(R)	ISC needs to learn (Let idle for 2 minutes, Erase memory and retest)
		Transmission EPC circuit/solenoid failure – Transmissions
		3 Digit codes
111		System checks OK
112	(O,M)	Intake Air Temperature (IAT) sensor is/was low or grounded – IAT
113	(O,M)	IAT sensor is/was high or open – IAT
114	(O,R)	IAT sensor out of range – IAT
116	(O,R)	Engine Coolant (ECT) sensor out of range – ECT
117	(O,M)	ECT sensor is/was low or grounded – ECT
118	(O,M)	ECT sensor is/was high or open – ECT
121	(O,R,M)	Throttle Position (TP) sensor out of range – TPS
122	(O,M)	TP low (possibly grounded or open circuit) – TPS
123	(O,M)	TP is/was high or short to power – TPS
124	(M)	TP voltage was higher than expected – Fuel control
125	(M)	TP voltage was lower than expected – Fuel control
126	(O,R,M)	MAP or BARO sensor out of range – “>MAP
128	(M)	MAP vacuum has not been changing – check vacuum lines – “>MAP
129	(R)	No MAP or Mass Air Flow sensor change during “goose” test – MAP MAF
136	(R)	Oxygen sensor not switching/system lean Left or Front HO2S – Fuel control
137	(R)	Oxygen sensor not switching/system rich Left or Front HO2S – Fuel control
138	(R)	Fault in Cold Start Injector circuit – Fuel control
139	(M)	Oxygen sensor not switching Left or Front HO2S – Fuel control
144	(M)	Oxygen sensor not switching Single, Right or Rear HO2S – Fuel control
157	(R,M)	Mass Air Flow signal is/was low or grounded – MAF
158	(O,R,M)	MAF sensor is/was high or short to power – MAF
159	(O,R)	MAF sensor is/was out of range – MAF
167	(R)	No Throttle Position sensor change in “goose” test (must get at least 25% rotation) – TPS
171	(M)	Oxygen sensor not switching – system was at adaptive limits – Single, Right or Rear HO2S – Fuel control
172	(R,M)	Oxygen sensor not switching – system is or was lean – Single, Right or Rear HO2S – Fuel control
173	(R,M)	Oxygen sensor not switching – system is or was rich – Single, Right or Rear HO2S – Fuel control
174	(M)	Oxygen sensor was slow in switching Single, Right or Rear HO2S – Fuel control
175	(M)	Oxygen sensor not switching – system was at adaptive limits – Left or Front HO2S – Fuel control
176	(M)	Oxygen sensor not switching – system is or was lean Left or Front HO2S – Fuel control
177	(M)	Oxygen sensor not switching – system was rich Left or Front HO2S – Fuel control
178	(M)	Oxygen sensor was slow in switching Left or Front HO2S – Fuel control
179	(M)	Fuel system was rich at part throttle Single, Right or Rear HO2S – Fuel control
181	(M)	Fuel system was lean at part throttle Single, Right or Rear HO2S – Fuel control
182	(M)	Fuel system was rich at idle Single, Right or Rear HO2S – Fuel control
183	(M)	Fuel system was lean at idle Single, Right or Rear HO2S – Fuel control
184	(M)	Mass Air (MAF) output higher than expected – Fuel control
185	(M)	Mass Air (MAF) output lower than expected – Fuel control
186	(M)	Injector pulse width longer than expected or Mass Air Flow (MAF) lower than expected – Fuel control
187		Injector pulse width shorter than expected or Mass Air Flow (MAF) higher than  expected – Fuel control
188	(M)	Fuel system was rich at part throttle – Left or Front HO2S – Fuel control
189	(M)	Fuel system was lean at part throttle – Left or Front HO2S – Fuel control
191	(M)	Fuel system was rich at idle – Left or Front HO2S – Fuel control
192	(M)	Fuel system was lean at idle – Left or Front HO2S – Fuel control
193		Failure in Flexible Fuel (FF) sensor circuit – Fuel control
194	(M)	Perform cylinder balance test to check for inoperative injectors
195	(M)	Perform cylinder balance test to check for inoperative injectors
211	(M)	Ignition PIP signal was erratic or missing – Ignition Systems
212	(M)	Ignition TACH signal was erratic (module/wiring) or SPOUT circuit fault – Ignition Systems
213	(R)	Ignition SPOUT or SAW circuit open or shorted – Ignition Systems
214	(M)	Error in Cylinder ID (CID) circuit or signal – Ignition Systems
215	(M)	Primary circuit failure – ignition coil 1 – Ignition Systems
216	(M)	Primary circuit failure – ignition coil 2 – Ignition Systems
217	(M)	Primary circuit failure – ignition coil 3 – Ignition Systems
218	(M)	IDM signal open or high or left coil pack failure – Ignition Systems
219	(M)	SPOUT circuit failure, timing defaulted to 10 degrees – follow code 213 diagnosis
222	(M)	IDM open or high or right coil pack failure – Ignition Systems
223	(M)	Dual Plug (DPI), SPOUT or IDM circuit fault – Ignition Systems
224	(M)	Failure in ignition coil primary circuit – Ignition Systems
225	(R)	Knock sensor not tested (ignore if not pinging) – KS
226	(O)	Ignition Diagnostic Monitor (IDM) signal fault – Ignition Systems
232	(M)	EI primary coil circuit failure – Ignition Systems
238	(M)	EI primary circuit failure – ignition coil 4 – Ignition Systems
311	(R)	AIR system not working – Single, Right or Rear HO2S – Air Injection
312	(R)	AIR not diverting – Air Injection
313	(R)	AIR not bypassing – Air Injection
314	(R)	AIR inoperative, Left or Front HO2S – Air Injection
326	(R,M)	Pressure Feedback EGR shows low pressure EGR not seating or not seating intermittantly – PFE
327	(O,R,M)	EGR feedback signal is/was low – EVR or PFE
328	(O,R,M)	EGR Valve Position (EVP) is/was low – EVR
332	(R,M)	EGR did not open/respond during test or if memory code, did not open intermittantly – EVR or PFE
334	(O,R,M)	EVP sensor is/was high – EVR
335	(O)	EGR feedback signal is/was out of range – EVR or PFE
336	(O,R,M)	PFE sensor signal is/was was high – “>PFE
337	(O,R,M)	EGR feedback signal is/was was high – EVR
338	(M)	Cooling system did not heat up (check cooling system / thermostat operation)
339	(M)	Cooling system overheated (check cooling system / thermostat operation)
341	(O)	Octane jumper installed (information only code to notify you if it is installed)
411	(R)	Idle speed system not controlling idle properly (generally idle too high) – ISC
412	(R)	Idle speed system not controlling idle properly (generally idle too low) – ISC
452	(M)	Vehicle Speed Sensor (VSS) problem
511	(O)	No power to PCM pin 1 or bad PCM (processor)
512	(M)	Memory power (PCM pin 1) was interrupted – Was battery disconnected ?
513	(O)	Replace processor (PCM) (internal failure)
519	(O)	PSP switch/circuit open – PSP h Pedal Position (CPP) circuit fault – PNP
528	(M)	System shows voltage at pin 10 (is A/C on ?) or pin 30 (PNP, CPP switch) – PNP
529	(M)	Data Communications Link to processor failure Service any EEC codes, erase memory and retest  If code is still present refer to instrument cluster diagnosis manual
533	(M)	Data Communications Link to instrument cluster failure – see 529
536	(O,R,M)	Brake On Off open or shorted to ground – BOO
538	(R)	System did not receive “goose” test – TESTS
539	(O)	System shows voltage at PCM pin 10  Is A/C on ?
542	(O,M)	Fuel pump open, bad ground or always on – – Power / Fuel Pump Circuits
543	(O)	Fuel pump monitor circuit shows no power – Power / Fuel Pump Circuits
	(M)	(Service 556 code first if present) Fuel pump relay or battery power feed was open – Power / Fuel Pump Circuits
551		Problem in Intake Manifold Runner Control (IMRC) solenoid/circuit – Solenoids
552	(O)	AIRB solenoid/circuit failure – Solenoids
553	(O)	AIRD solenoid/circuit failure – Solenoids
554	(O)	Fuel Press Regulator Control solenoid/circuit fault – Power / Fuel Pump Circuits
556	(O,M)	Fuel pump relay primary circuit fault – Power / Fuel Pump Circuits
557	(O,M)	Low speed pump relay primary circuit fault – Power / Fuel Pump Circuits
558	(O)	EGR vacuum regulator solenoid/circuit failure – EVR or PFE or Solenoids
559	(O)	A/C relay primary circuit fault – A/C and Fan Circuits
563	(O)	High Fan Control (HFC) circuit failure – A/C and Fan Circuits
564	(O)	Fan Control (FC) circuit failure – A/C and Fan Circuits
565	(O)	Canister Purge 1 solenoid/circuit failure – Solenoids
566	(O)	transmission 3/4 shift solenoid/circuit – Transmissions
569	(O)	Canister Purge 2 solenoid/circuit failure – Solenoids
578	(M)	A/C pressure sensor VREF short to ground – A/C and Fan Circuits
579	(M)	ACP sensor did not change with A/C on – A/C and Fan Circuits
581	(M)	Cooling fan current was excessive – A/C and Fan Circuits
582	(O)	Open cooling fan circuit – A/C and Fan Circuits
583	(M)	Fuel pump current was excessive – Power / Fuel Pump Circuits
584	(M)	Open power ground circuit – Power / Fuel Pump Circuits
585	(M)	A/C clutch current was excessive – A/C and Fan Circuits
586	(M)	Open circuit in A/C clutch – A/C and Fan Circuits
587	(O, M)	Communication problem between PCM and Variable Control Relay Module (VCRM) – Power / Fuel Pump Circuits
617	(M)	Transmission shift failure (1/2 shift) – Transmissions
618	(M)	Transmission shift failure (2/3 shift) – Transmissions
619	(M)	Transmission shift failure (3/4 shift) – Transmissions
621	(O)	Solenoid/circuit failure – shift solenoid 1 – Transmissions
622	(O)	Solenoid/circuit failure – shift solenoid 2 – Transmissions
624	(O,M)	Solenoid/circuit failure -Electronic Pressure Control (EPC) current is high – Transmissions
625	(O,M)	Solenoid/circuit failure – Electronic Pressure Control (EPC) current is low – Transmissions
626	(O)	Transmission Coast Clutch (CCS) Solenoid/circuit fault – Transmissions
627	(O)	Torque Converter Clutch circuit fault – Transmissions
628	(M)	Excessive converter clutch slippage – Transmissions
629	(O,M)	Torque Converter Clutch circuit fault – Transmissions
631	(O)	Overdrive Cancel Light circuit problem – Transmissions
632	(R)	E4OD – Transmission Control Switch (TCS) should be cycled once between engine ID and  Goose test
633	(O)	4x4L switch should be in 4×2 or 4×4 high for the test
634	(O,M)	Park/Neutral Position (PNP) or Clutch Pedal Position (CPP) circuit fault  Electronic shift transmission – Manual Lever Position (MLP) sensor out of range in Park-Transmissions
636	(O,R)	Transmission Oil Temperature (TOT) sensor out of range – Transmissions
637	(O,M)	TOT sensor is/was high or open – Transmissions
638	(O,M)	TOT sensor is/was low or grounded – Transmissions
639	(R,M)	Transmission Speed sensor (TSS) circuit fault – Transmissions
641	(O)	Transmission solenoid/circuit failure Shift Solenoid 3 – Transmissions
643	(O,M)	Torque Converter Clutch (TCC) circuit – Transmissions
645	(M)	Transmission 1st gear failure – Transmissions
646	(M)	Transmission 2nd gear failure – Transmissions
647	(M)	Transmission 3rd gear failure – Transmissions
648	(M)	Transmission 4th gear failure – Transmissions
649	(M)	Transmission EPC system failure – Transmissions
651	(M)	Transmission EPC solenoid/circuit fault – Transmissions
652	(O)	Torque Converter Clutch (TCC) circuit fault – Transmissions
654	(O)	Transmission selector not in PARK – Transmissions
656	(M)	Torque Converter Clutch (TCC) slip – Transmissions
657	(M)	Transmission temperature was excessive – Transmissions

(R) = Engine Running test (M) = Memory code  (O)=Key On Engine Off test

Ford OBD/OBD2 Trouble Codes By Model