Chevrolet >> Camaro 3.4L – Camaro 5.7L – Caprice 5.7L – Caprice Wagon 4.3L – Corvette 5.7L (OBD-II)

Model Year Engine identification System
Camaro 3.4L 1993-95 VIN  position 8 = S GM
Camaro 5.7L 1993-94 VIN  position 8 = P GM
Caprice 5.7L 1993-95 VIN  position 8 = P GM
Caprice Wagon 4.3L 1993-95 VIN  position 8 = W GM
Corvette 5.7L  (OBO-I) 1994 VIN  position 8 = P GM

General information

  • Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.
  • Trouble codes can be displayed by the MIL or by using a Scan Tool connected to the data link connector (DLC).

Accessing

Models with data link connector (DLC) terminal B connected
  • Access data link connector (DLC).
  • Jump data link connector (DLC) terminals A and B [1].
  • Switch ignition ON. Do NOT start engine.
  • Count MIL flashes. Note trouble codes. Compare with trouble code table.
  • Firstly trouble code 12 will be displayed 3 times.
  • Trouble codes consist of 2 groups, displayed as follows:
o First group indicates the ‘tens’ of the trouble code 2 [A].
o Second group indicates the ‘units’ of the trouble code 2 [C].
o A short pause separates each group 2 [B].
o A long pause separates each trouble code 2 [D].
o For example: Trouble code 12 displayed [2] . Start of diagnosis.
• Each additional trouble code will now be displayed 3 times, in ascending order.
 
NOTE: If no additional trouble codes are stored, code 12 will continue to be displayed.
• Trouble codes can also be displayed by using a Scan Tool connected to the data link connector (DLC) 1.
Models without data link connector (DLC) terminal B connected
• Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC) 1.

Erasing

NOTE: Disconnecting battery ground lead may cause driveability problems until the engine management system relearns basic values.
  • Ensure ignition switched OFF.
  • Disconnect battery ground cable for 30 seconds.
  • Reconnect battery ground cable .
  • Repeat checking procedure to ensure no trouble codes remain in ECM fault memory.
NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio.
• Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC) 1.

Trouble code  identification

Flash code Fault location Probable cause
11 Malfunction indicator lamp (MIL) -circuit malfunction Wiring open circuit/short circuit to ground, MIL, ECM
12 Start of diagnosis No engine speed (RPM) signal received
13 Oxygen sensor (02S), bank 2 Wiring open circuit, 025, ECM
13 Oxygen sensor (02S), bank 1 Wiring open circuit, 025, ECM
14 Engine coolant temperature (ECT) sensorvoltage low Wiring short circuit to ground, ECT sensor, ECM
15 Engine coolant temperature (ECT) sensor voltage high Wiring open circuit, ECT sensor, ECM
16 System voltage low Wiring, alternator
16 Distributor ignition system, low resolution signal -circuit malfunction Wiring, distributor, ECM
17 Camshaft position (CMP) sensor -circuit malfunction Wiring, CMP sensor, mechanical fault, ECM
18 Injector(s) -circuit malfunction Wiring, injector(s)
21 Throttle position (TP) sensor -voltage high Wiring open circuit/short circuit to positive, TP sensor, ECM
22 Throttle position (TP) sensor -voltage low Wiring open circuit/short circuit to ground, TP sensor, ECM
23 Intake air temperature (IAT) sensor -voltage high Wiring open circuit, IAT sensor, ECM
24 Vehicle speed sensor (VSS) -no signal Wiring, VSS, ECM
25 Intake air temperature (IAT) sensor -voltage low Wiring short circuit to ground, IAT sensor, ECM
26 Evaporative emission (EVAP) canister purge valve -open!short circuit Wiring, EVAP canister purge valve, ECM
26 Engine control module (ECM), quad driver! output driver -circuit malfunction Wiring, ECM controlled components, ECM (!)
27 Engine control module (ECM), quad driver! output driver -circuit malfunction Wiring, ECM controlled components, ECM (!)
27 Exhaust gas recirculation (EGR) solenoid Wiring, poor connections, EGR valve, ECM
28 Engine control module (ECM), quad driverl output driver -circuit malfunction Wiring, ECM controlled components, ECM m
28 Transmission range (TR) switch -malfunction Wiring, TR switch, ECM
29 Secondary air injection (AIR) pump relay circuit malfunction Wiring, AIR pump relay, ECM
32 Exhaust gas recirculation (EGR) solenoid Wiring, poor connections, EGR valve, ECM
33 Manifold absolute pressure (MAP) sensor voltage high Wiring short circuit to positive, hose blocked/leaking, MAP sensor, ECM
34 Manifold absolute pressure (MAP) sensor voltage low Wiring open circuit/short circuit to ground, MAP sensor, ECM
35 Idle air control (lAC) valve I Wiring open circuit/short circuit to groundl shortcircuit to positive, lAC valve, intake system leaking, fuel system, PCV valve, A/C system, mechanical fault, ECM
36 Crankshaft position (CKP) sensor. at crankshaft pulley -24X signal circuit malfunction Wiring, CKP sensor, ECM
36 Distributor ignition system. high resolution signal -circuit malfunction Wiring, distributor, ECM
37 Brake pedal position (BPP) switch for torque converter clutch (TCC) Wiring, incorrectly adjusted, BPP switch, ECM
38 Brake pedal position (BPP) switch, torque converter clutch (TCC) -low voltage Wiring open circuit, incorrectly adjusted, BPPswitch, ECM
39 Clutch pedal position (CPP) switch Wiring, incorrectly adjusted, CPP switch, ECM
41 Ignition control. timing signal -circuit malfunction Wiring, poor connections, ICM, ECM
42 Ignition control. bypass signal -circuit malfunction Wiring, poor connections, ICM, ECM
43 Knock sensor (KS) -circuit malfunction Wiring, KS, ECM
44 Oxygen sensor (02S). bank 2 -mixture lean Wiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 025, ECM
44 Oxygen sensor (02S)/heated oxygen sensor(H02S). bank 1 -mixture lean Wiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 02S/H02S,ECM
45 Oxygen sensor (02S), bank 2 -mixture rich Wiring open circuit, fuel pressure high, injector(s) leaking, 025, EVAP purge valve, TP sensor, EGR system, ECM
450 Oxygen sensor (02S)/heated oxygen sensor(H02S). bank 1 -mixture rich Wiring open circuit, fuel pressure high, injector(s)leaking, 02S/H02SEVAP purge valve, TP sensor, EGR system, ECM
46 Immobilizer system, code -malfunction Incorrect key, immobilizer control module, ECM
47 Knock control module, removable part in engine control module (ECM) -circuit malfunction Wiring, poor connection, missing knock control module, ECM
48 Mass air flow (MAF) sensor -no signal Wiring, poor connections, MAF sensor, ECM
50 System voltage low Alternator
51 Engine control module (ECM), PROMmalfunction Poor connections, incorrect programming, ECM
52 Engine oil temperature (EOT) sensor -voltagehigh Wiring, EOT sensor, ECM
53 System voltage high Alternator
54 Fuel pump circuit -voltage low Wiring open circuit/short circuit to ground, fuel pump relay, engine oil pressure warning lamp/fuel pump switch
55 Engine control module (ECM), fuel lean monitor Fuel filterllines blocked, fuel contamination
58 Transmission fluid temperature (TFT) sensor voltage low Wiring short circuit to ground, TFT sensor, ECM
59 Transmission fluid temperature (TFT) sensor voltage high Wiring open circuit, TFT sensor, ECM
61 A/C system -performance Refrigerant low, wiring, A/C refrigerant pressure sensor, A/C evaporator temperature sensor, ECM
62 Engine oil temperature (EOT) sensor -voltage low Wiring, EOT sensor, ECM
63 Oxygen sensor (02S), bank 1 Wiring open circuit, 025, ECM
63 Oxygen sensor (02S)/heated oxygen sensor (H02S), bank 2 Wiring open circuit, 025/H025, ECM
64 Oxygen sensor (02S), bank 1 -mixture lean Wiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 025, ECM ·
64 Oxygen sensor (02S)/heated oxygen sensor(H02S), bank 2 -mixture lean , Wiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 025/H025,ECM
65 Oxygen sensor (02S), bank 1 -mixture rich Wiring open circuit, fuel pressure high, injector(s) leaking, 025, EVAP purge valve, TP sensor, EGR system, ECM
65 Oxygen sensor (02S)/heated oxygen sensor (H02S), bank 2 -mixture rich Wiring open circuit, fuel pressure high, injector(s) leaking, 025/H025, EVAP purge valve, TP sensor, EGR system, ECM
66 A/C refrigerant pressure sensor -voltage low Wiring open circuit/short circuit to ground, A/C refrigerant pressure sensor, ECM
67 A/C refrigerant pressure sensor -circuit malfunction Wiring open circuit, A/C refrigerant pressuresensor, ECM
68 A/C compressor clutch relay -circuit malfunction Wiring short circuit, A/C compressor clutch relay, ECM
69 A/C compressor clutch relay -circuit malfunction Wiring open circuit, A/C compressor clutch relay, ECM
70 A/C refrigerant pressure sensor -voltage high Wiring open circuit/short circuit to positive, ‘A/C refrigerant pressure sensor, ECM
71 A/C evaporator temperature sensor -voltage high Wiring, poor connections, A/C evaporator temperature sensor
72 Vehicle speed sensor (V88) -circuit malfunction Wiring, V55, ECM
73 A/C evaporator temperature sensor -voltage low Wiring, poor connections, A/C evaporator temperature sensor
73 Transmission fluid pressure (TFP) control solenoid -circuit malfunction Wiring, poor connection, TFP solenoid
74 Traction control system (TC5), active signal malfunction Wiring short to ground, AB5ITC5, ECM
75 Exhaust gas recirculation (EGR) solenoid 1 circuit malfunction Wiring, EGR valve, ECM
75 8ystem voltage low, engine control module (ECM) Wiring, battery, alternator, ECM
76 Exhaust gas recirculation (EGR) solenoid 2 circuit malfunction Wiring, EGR valve, ECM
77 Exhaust gas recirculation (EGR) solenoid 3 circuit malfunction Wiring, EGR valve, ECM
77 Engine coolant blower motor relay -circuit malfunction Wiring, engine coolant blower motor relay, ECM
78 Engine coolant blower motor relay 2 -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, engine coolant blower motor relay, ECM
79 Transmission fluid temperature (TFT) high Transmission mechanical fault, towing weight limit exceeded
80 Torque converter clutch (TCC) -slipping Wiring, TCC solenoid, transmission mechanical fault, ECM
81 Brake pedal position (BPP) switch , torque converter clutch (TCC) -circuit malfunction Wiring, BPP switch, ECM
81 Transmission shift solenoid (88), 2nd-3rd circuit malfunction Wiring, 55, ECM
82 Crankshaft position (CKP) sensor, in cylinder block -3X signal circuit malfunction Wiring open circuit/short circuit to ground, CKP sensor, ICM
82 Transmission shift solenoid (88), 1st-2nd -circuit malfunction Wiring, 55, ECM
83 Reyerse gear inhibit solenoid -circuit malfunction Wiring, reverse gear inhibit solenoid, ECM
83 Torque converter clutch (TCC) solenoid, pulse width modulated -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to pOSitive, TCC solenoid, ECM
84 Transmission 3rd-2nd control solenoid -circuit malfunction Wiring, control solenoid, ECM
84 2nd-3rd gear inhibit relay -circuit malfunction Wiring, inhibit relay, ECM
85 Engine control module (ECM), PROM -malfunction Poor connections, incorrect programming, ECM
85 Torque converter clutch (TCC) solenoid -stuck ON Wiring open circuit/short circuit to ground, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM
86 Engine control module (ECM) -analogue! digital converter A/C refrigerant pressure sensor/KSI ECT sensor/fuel pump monitor circuit short circuit to battery voltage
87 Engine control module (ECM), EEPROMmalfunction Poor connections, incorrect programming, ECM
90 Torque converter clutch (TCC) solenoid -circuit malfunction Wiring, TCC solenoid, ECM
91 5kip shift warning lamp -circuit malfunction Wiring, skip shift warning lamp, ECM
93 Transmission fluid pressure (TFP) control solenoid -circuit malfunction Wiring, poor connection, TFP solenoid
95 Change oil lamp -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, instrument panel, engine oil life lamp bulb, ECM
96 Engine control module (ECM) -ignition supply voltage low Wiring open circuit, alternator, ECM
96 Engine oil level warning lamp -circuit malfunction Wiring open circuit/short circuit to groundl short circuit to positive, instrument panel, engine oil level lamp bulb, oil level sensor, ECM
97 Engine control module (ECM), vehicle speed sensor (VS5) output signal circuit malfunction Wiring, poor connections, ECM
98 Engine control module (ECM) incorrectly coded ECM incorrectly coded, ECM
99 Engine control module (ECM) incorrectly coded ECM incorrectly coded, ECM
99 Engine control module (ECM), tachometer output signal -circuit malfunction Wiring, poor connections, ECM
  Use of the vehicle wiring diagram is recommended to confirm which components are fitted .
o A/C compressor clutch relay0 Exhaust gas recirculation (EGR) solenoid
o A/C condenser blower motor relay0 Malfunction indicator lamp (MIL)
o Engine coolant blower motor rela 0 Torque converter clutch (TCC) solenoid
o Engine coolant ‘hot’ warning lamp0 Transmission shift solenoids (55)
o Evaporative emission (EVAP) canister purge0 Transmission shift warning lamp (MT) valve