GM Import / GEO

ModelYearEngine identificationSystem
Geo 1.6L90
Geo 1.6L91
Geo 1.6L95
Prizm 1.6L1992-97VIN position 8 =6TCCS
Prizm 1.8L1992-97VIN position 8 =8TCCS
Tracker 1.6L1992-97G16EPI

GM Import Trouble Code Info

87-88 Sprint Turbo,89 & later Metro, Tracker, Storm.

12Diagnostic function working
13Oxygen sensor or circuit
14Coolant temperature sensor or circuit (open)
15Coolant temperature sensor or circuit (shorted)
21Throttle position sensor or circuit (open)
22Throttle position sensor or circuit (shorted)
23Intake air temperature sensor or circuit (open)
24Vehicle speed sensor (VSS) or circuit
25Intake air temperature sensor or circuit (shorted)
31High turbo pressure (87 – 88)
31Barometric pressure sensor or circuit (89 -95)
32Barometric pressure sensor or circuit (89 – 95)
32EGR system (91 – 93)
33Airflow meter (turbo)
33Manifold Absolute Pressure (MAP) sensor (90 – 91)
41Ignition signal problem
42Crank angle sensor (except Storm)
42Camshaft position sensor circuit (94-95)
42Electronic Spark Timing (EST) (Storm)
44ECM idle switch circuit open
44Oxygen sensor or circuit – lean exhaust
45Oxygen sensor or circuit – rich exhaust
46Idle speed control motor
51EGR system (except Storm)
51ECM (Storm)
53ECM ground circuit
ON SteadyECM faulty

89 – 92 GEO Metro TBI

13Oxygen Sensor circuit.
14Coolant Temperature Sensor circuit. High temperature indicated.
15Coolant Temperature Sensor circuit. Low temperature indicated.
21Throttle Switch circuit (Manual Transmission).
21Throttle Position Sensor Signal Voltage High (Automatic Transmission).
22Throttle Position Sensor Signal Voltage Low.
23Intake Air temperature (MAT) Sensor. Low temperature indicated.
24Vehicle Speed Sensor circuit.
25Intake Air temperature (MAT) Sensor. High temperature indicated.
31MAP Sensor circuit – Signal Voltage Low Vacuum.
32MAP Sensor circuit – Signal Voltage High Vacuum.
33MAP Sensor circuit.
41Ignition Signal circuit.
42Crank Angle Sensor.
46Idle Speed Control Motor circuit.
51EGR circuit.
53Ground circuit.
93 – 95
13Oxygen Sensor circuit. Signal voltage does not change.
14Engine Coolant Temperature Sensor circuit High Voltage Input. Low temperature indicated.
15Engine Coolant Temperature Sensor circuit Low Voltage Input. High temperature indicated.
21Throttle Position Sensor circuit High Voltage Input.
22Throttle Position Sensor circuit Low Voltage Input.
23Intake Air temperature Sensor circuit – High Voltage Input. Low temperature indicated.
24Vehicle Speed Sensor circuit.
25Intake Air temperature Sensor circuit – Low Voltage Input. High temperature indicated.
31MAP Sensor circuit Low Voltage Input – Low manifold pressure.
32MAP Sensor circuit High Voltage Input – High manifold pressure.
41Ignition Signal circuit.
42Crankshaft Position Sensor circuit – No Signal for 2 seconds.
46Idle Speed Control Motor circuit.
51EGR circuit.

Sprint(non-turbo)

12Diagnostic function working
13Oxygen sensor circuit
14Coolant temperature sensor circuit
21Throttle position switches or circuit
23Intake air temperature circuit
32Barometric Pressure circuit
51Possible faulty ECM
52Fuel cut solenoid or circuit
53Secondary air circuit
54Mixture control solenoid or circuit
55Bowl vent solenoid or circuit

GEO, Sprint, Nova & Spectrum

12No distributor reference pulse to ECM
13Oxygen sensor circuit
14Coolant sensor – high or low temp
21Throttle Position Sensor (TPS) voltage high or low
23Intake Air Temperature IAT sensor circuit voltage high or low
24Vehicle Speed Sensor (VSS) or circuit
32EGR (Exhaust gas recirculation) EVRV shorted to ground on start-up
33Manifold Absolute Pressure (MAP) sensor voltage high or low
42Electronic Spark Timing (EST) circuit
44Oxygen sensor or circuit indicates lean exhaust (heated type)
45Oxygen sensor or circuit indicates rich exhaust
51ECM or EEPROM
43Detonation (knock) sensor or circuit–Turbo type

Spectrum

12No distributor reference pulses to ECM
13Oxygen sensor circuit
14Coolant sensor circuit shorted.
15Coolant sensor circuit open.
16Coolant sensor circuit open.
21Idle switch out of adjustment (or open circuit) non-Turbo t
21Throttle Position Sensor (TPS) voltage high– Turbo
22Fuel cut off relay or circuit open–non-Turbo
22Throttle Position Sensor (TPS) voltage low–Turbo
23Open or grounded Mixture Control(M/C) solenoid or circuit– non-Turbo
23Manifold Air Temperature MAT sensor or circuit–Turbo
24Vehicle Speed Sensor (VSS) or circuit–Turbo
25Open or grounded vacuum switching valve or circuit–non-Turbo
25Air Switching Valve (ASV) or circuit–Turbo
31Wastegate control–Turbo
33Manifold Absolute Pressure (MAP) sensor voltage high–Turbo
34Manifold Absolute Pressure (MAP) sensor voltage low–Turbo
42Electronic Spark Timing (EST) circuit EST circuit is grounded or open. Turbo
42Fuel cut off relay or circuit non-Turbo type
44Oxygen sensor or circuit indicates lean exhaust non-Turbo
45Oxygen sensor or circuit indicates rich exhaust
51ECM or PROM
53Shorted switching unit or faulty ECM non-Turbo
54Mixture Control (M/C) solenoid or circuit, or faulty ECM non-Turbo
55Faulty ECM non-Turbo
0 0 votes
Article Rating
Subscribe
Notify of
guest

This site uses Akismet to reduce spam. Learn how your comment data is processed.

0 Comments
Inline Feedbacks
View all comments