GM Import / GEO >> Tracker 1.6L (1992 – 1997)

ModelYearEngine identificationSystem
Tracker 1.6L1992·97G16EPI

General information

  • Refer to the front of this manual for general test conditions, terminology, detailed descriptions of wiring faults and a general trouble shooter for electrical and mechanical faults.
  • 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.
  • 1992-95: Trouble codes can be displayed by the MIL or by using a Scan Tool connected to the 12 pin data link connector (DLC).
  • 1996-97: Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC).

Accessing

  • Access data link connector (DLC) [1].
  • Jump data link connector (DLC) terminals 2 and 3 (Federal) [2] 1, or terminals 2 and 4 (California) [2] 2.
  • Switch ignition ON. Do NOT start engine.
  • Count MIL flashes. Note trouble codes. Compare with trouble code table.
  • Each trouble code consists of two groups of one or more flashes [3] A, displayed as follows:
  1. o The first group of flashes indicate the ‘tens’ of the trouble code.
  2. o The second group of flashes indicate the ‘units’ of the trouble code.
  3. o A short pause separates ‘tens’ and ‘units’ [3] [B].
  4. o A long pause separates each trouble code [3] [C].
  5. o For example: Trouble code 21 displayed [3].
• Each trouble code will be displayed three times, in ascending order.  
NOTE: If no trouble codes are stored, code 12 will be displayed.
• Trouble codes can also be displayed by using a Scan Tool connected to the 12 pin data link connector (DLC) [4].

1996-97

• Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC) [5]

Erasing

  • Ensure ignition switched OFF.
  • Remove TAIL/DOME fuse F10 (15A) from fascia fuse box for at least 30 seconds [6].
  • Reinstall fuse.
  • Repeat accessing procedure to ensure no trouble codes remain in ECM fault memory.
  • Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC): 1992-95 -12 pin, 1996-97 -16 pin.

Method 2

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 at least 30 seconds.
  • Reconnect battery ground cable.
  • Repeat accessing procedure to ensure no trouble codes remain in ECM fault memory.
  • Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC): 1992-95 -12 pin, 1996-97 -16 pin.
NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio.

Trouble code  identification

Scan codeFault locationProbable cause
PO,P2, UORefer to OBO-II trouble code tables–
P1408Manifold absolute pressure (MAP) sensor circuit malfunctionWiring, hose leak/blockage, MAP sensor, ECM
P1410Fuel tank pressure control system malfunctionWiring, fuel tank pressure control solenoid, ECM
P1450Barometric pressure (BARO) sensor -circuit malfunctionECM
P1451Barometric pressure (BARO) sensor -range! performance problemECM
P1500Starter signal -circuit malfunctionWiring, ignition switch, ECM
P1510Engine control module (ECM) -supply voltageWiring, ECM
P1530Ignition timing adjustment connector -circuit malfunCtionWiring, ECM
P1600Engine control module (ECM) -supply voltageWiring, ECM
 
Trouble codeFault locationProbable cause
12Start of diagnosisNo engine speed (RPM) signal received
13Oxygen sensor (02S)/heated oxygen sensor (H02S)-signal not fluctuatingWiring, 02S/H02S, ECM
14Engine coolant temperature (ECT) sensor -high voltage signalWiring open circuit/short circuit to positive, ECT sensor, ECM
15Engine coolant temperature (ECT) sensor -lowvoltage signalWiring short circuit to ground, ECT sensor, ECM
21Throttle position (TP) sensor high voltage signalWiring, TP sensor, ECM
22Throttle position (TP) sensor -low voltage signalWiring, TP sensor, ECM
23Intake air temperature (IAT) sensor -high voltage signalWiring open circuit/short circuit to positive, IAT sensor, ECM
24Vehicle speed sensor (VSS) -circuit malfunctionWiring, VSS, ECM
25Intake air temperature (IAT) sensor -low voltage signalWiring short circuit to ground, IAT sensor, ECM
31Manifold absolute pressure (MAP) sensor -low voltage signalWiring open circuit/short circuit to ground, MAP sensor, ECM
32Manifold absolute pressure (MAP) sensor -high voltage signalWiring short circuit to positive, hose leak, MAP sensor, ECM
41Ignition fail safe signalWiring, noise suppressor, ignition module, ECM
42Crankshaft position (CKP) sensor -circuit malfunctionWiring, CKP sensor, ECM
44Throttle position (TP) sensor closed throttle position (CTP) switch contacts -circuit malfunctionIncorrectly adjusted TP sensor, wiring open circuit, TP sensor, ECM
45Throttle position (TP) sensor closed throttle position (CTP) switch contacts -circuit malfunctionIncorrectly adjusted TP sensor, wiring short circuit, CTP switch, ECM
51Exhaust gas recirculation (EGR) system -circuitHose leak/blockage, wiring, EGR valve, EGRT sensor, ECM
53Engine control module (ECM) -ground circuitWiring open circuit, ECM