Accessing Diagnostic Trouble Codes 96 & later are OBD2 systems

The check engine warning light will come on when the ignition switch is turned On and the engine is not running. When the engine is started, the check engine warning light should go off. If light remains on, the self-diagnosis system has detected a fault in the system.

1. Battery voltage must be 11 volts or more. Throttle valve must be fully closed. Transmission must be in Neutral position. All accessories must be turned Off.
2. On pre-OBD II models, turn ignition to On, then use a jumper wire to connect terminals TE1 and El of the data link connector, located under the left hand side of the instrument panel. Codes are indicated by the number of flashes of the check engine warning light. On models with OBD II, utilize an OBDII scan tool , then connect to data link connector (DLC). Turn ignition and scan tool to On, and write down any codes and “freeze-frame data” that appear.

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Reading Trouble Codes

If the ECU has detected a system malfunction, the check engine light will blink every .5 second. The first number of blinks will equal the first digit of a two digit diagnostic trouble code and after a 1.5 second pause, the second number of blinks will equal the second digit of same diagnostic trouble code. If there are two or more DTC’s, there will be a 2.5 second pause between each. After all DTC’s have been output there will be a 4.5 second pause and all DTC’s will be repeated as long as the terminals TE1 and El of the data link connector are connected. In the event of two or more DTC’s, indication will begin from smaller numbered code and continue in order to the larger. After all DTC have been recorded, remove jumper wire.

Clearing Trouble Codes

After service, the diagnostic trouble code or DTC’s retained in the ECU memory must be cleared by remove the EFI fuse for approximately 10 seconds or more, depending on ambient temperature (the lower the temperature, the longer the fuse must be left out) with the ignition switch off. The OBD II scan tool has a feature to clear DTC’s. Refer to the manufacturer’s manual for procedures. DTC clearing can also be done by removing the battery ground cable, other memory systems (clock) will also be cleared. If the diagnostic trouble code is not cleared, it will be retained by the ECU and appear along with a new DTC in future trouble codes. If it is necessary to work on engine components requiring removal of the battery ground cable, confirm no DTC’s are stored. After clearing codes, road test the vehicle to check that a normal operation. If the same diagnostic trouble code appears, the trouble has not been corrected.

Without OBD2

12	RPM Signal
13	RPM Signal
14	Ignition Signal
15	Ignition Signal
16	Electronically Controlled Transmission Control Signal
17	CMP No. 1
18	CMP No. 2
21	Main O2S & Heater Signal
22	ECT Sensor Signal
24	IAT Sensor Signal
25	Air–Fuel Ratio Lean Malfunction
26	Air–Fuel Ratio Rich Malfunction
27	Sub O2S Signal
28	Main O2S
29	Sub O2S
31 & 32	Air Flow Meter Signal
35	HAC/Barometric Pressure Sensor Signal
41	TP Sensor Signal
42	VSS Signal
43	Starter Signal
47	Sub TP Sensor
48	Secondary Injection System Malfunction
51	Switch Condition Signal
52	KS Signal
53	Knock Control Signal
55	KS Signal
70	EGR System Malfunction
71	EGR System Malfunction
78	Fuel Pump Control

With OBD2

P0100	MAF Malfunction
P0101	MAF Circuit Range/Performance
P0110	IAT Circuit Malfunction
P0115	ECT Circuit Malfunction
P0116	ECT Circuit Range/Performance
P0120	TP Position Sensor/Switch ‘‘A’’ Circuit Malfunction
P0121	TP Position Sensor/Switch ‘‘A’’ Circuit Range/Performance
P0125	Insufficient Coolant Temperature For Closed Loop Fuel Control
P0130	HO2S Circuit Malfunction, Bank 1 Sensor 1
P0133	HO2S Circuit Slow Response, Bank 1 Sensor 1
P0135	HO2S Heater Circuit Malfunction, Bank 1 Sensor 1
P0136	HO2S Circuit Malfunction, Bank 1 Sensor 2
P0141	HO2S Heater Circuit Malfunction, Bank 1 Sensor 2
P0150	HO2S Circuit Malfunction, Bank 2 Sensor 1
P0153	HO2S Circuit Slow Response, Bank 2 Sensor 1
P0155	HO2S Heater Circuit Malfunction, Bank 2 Sensor 1
P0156	HO2S Sensor Circuit Malfunction, Bank 2 Sensor 2
P0161	HO2S Heater Circuit Malfunction, Bank 2 Sensor 2
P0170	Fuel Trim Malfunction
P0171	System Too Lean (Fuel Trim)
P0172	System Too Rich (Fuel Trim)
P0174	System Too Lean (A/F Lean Malfunction, Bank 2)
P0175	System Too Rich (A/F Rich Malfunction, Bank 2)
P0300	Random Misfire Detected
P0301	Misfire Detected, Cylinder 1
P0302	Misfire Detected, Cylinder 2
P0303	Misfire Detected, Cylinder 3
P0304	Misfire Detected, Cylinder 4
P0305	Misfire Detected, Cylinder 5
P0306	Misfire Detected, Cylinder 6
P0307	Misfire Detected, Cylinder 7
P0308	Misfire Detected, Cylinder 8
P0325	KS 1 Circuit Malfunction
P0330	KS 2 Circuit Malfunction
P0335	CKP Sensor ‘‘A’’ Circuit Malfunction
P0340	CMP Circuit Malfunction
P0385	CKP Sensor ‘‘B’’ Circuit Malfunction
P0401	EGR Insufficient Flow
P0402	EGR Excessive Flow
P0403	EGR Circuit Malfunction
P0420	Catalyst System Efficiency Below Threshold Bank 1
P0430	Catalyst System Efficiency Below Threshold Bank 2
P0440	EVAP Emission Control System Malfunction
P0441	EVAP Emission Control System Improper Purge Flow
P0446	EVAP Emission Control System Vent Control Malfunction
P0450	EVAP Emission Control System Pressure Switch Malfunction
P0451	EVAP Control System Pressure Sensor Range/Performance
P0500	VSS Malfunction
P0505	Idle Control System Malfunction
P0510	Closed TP Switch Malfunction
P0550	Power Steering Pressure Sensor Circuit Malfunction
P1100	BARO Sensor Circuit Malfunction
P1120	Accelerator Pedal Position Sensor Circuit Malfunction
P1121	Accelerator Pedal Position Sensor Range/Performance Problem
P1125	Throttle Control Motor Circuit Malfunction
P1126	Magnetic Clutch Circuit Malfunction
P1127	ECTS Actuator Power Source Circuit Malfunction
P1128	Throttle Control Motor Lock Malfunction
P1129	Electronic Throttle Control System
P1130	Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (Bank 1 Sensor 1)
P1133	Air/Fuel Ratio Sensor Circuit Response Malfunction (Bank 1 Sensor 1)
P1135	Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P1150	Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (Bank 2 Sensor 1)
P1153	Air/Fuel Ratio Sensor Circuit Response Malfunction (Bank 2 Sensor 1)
P1155	Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P1200	Fuel Pump Relay/ECU Circuit Malfunction
P1300	Igniter Circuit Malfunction (Bank 1 Or No. 1)
P1305	Igniter Circuit Malfunction, (Bank 2 Or No. 2)
P1310	Igniter Circuit Malfunction (No. 3)
P1315	Igniter Circuit Malfunction (No. 4)
P1320	Igniter Circuit Malfunction (No. 5)
P1325	Igniter Circuit Malfunction (No. 6)
P1330	Igniter Circuit Malfunction (No. 7)
P1335	CKP Sensor Circuit Malfunction During Engine Running
P1340	Igniter Circuit Malfunction (No. 8)
P1345	VVT Sensor Circuit Malfunction (Bank 1)
P1346	VVT Sensor Rang/Performance Problem (Bank 1)
P1349	VVT System Malfunction (Bank 1)
P1350	VVT Sensor Circuit Malfunction (Bank 2)
P1351	VVT Sensor Range/Performance Problem (Bank 2)
P1354	VVT System Malfunction (Bank 2)
P1400	Sub-TP Sensor Malfunction
P1401	Sub-TP Sensor Range/Performance
P1410	EGR Valve Position Sensor Circuit Malfunction
P1411	EGR Valve Position Sensor Circuit Range/Performance Malfunction
P1500	Starter Signal Circuit Malfunction
P1520	Stop Lamp Switch Malfunction
P1565	Cruise Control Main Switch Circuit Malfunction
P1566	Cruise Control Main Switch Circuit Malfunction
P1600	ECM BATT Malfunction
P1605	Knock Control CPU Malfunction
P1633	ECM Malfunction (ETCS Circuit)
P1645	Body ECU Malfunction
P1656	OCV Circuit Malfunction (Bank 1)
P1663	OCV Circuit Malfunction (Bank 2)
P1780	PNP Switch Malfunction
B2785	Ignition Switch On Malfunction (Immobilizer System)
B2786	Ignition Switch Off Malfunction (Immobilizer System)
B2785	Ignition Switch On Malfunction (Immobilizer System)
B2791	Key Unlock Warning Switch Malfunction (Immobilizer System)
B2795	Unmatch Key Code (Immobilizer System)
B2796	No Communication In Immobilizer System
B2797	Communication Malfunction No. 1 (Immobilizer System)
B2798	Communication Malfunction No. 2 (Immobilizer System)