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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport, 2002 Isuzu Rodeo, 2002 Isuzu Axiom, and 2002 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
  2. Perform ELECTRIC THROTTLE CONTROL SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing electronic throttle control system check, go to next step.
  3. Turn ignition on. On scan tool, observe MAP sensor parameter. If MAP parameter is less than 65 kPa, go to next step. If MAP parameter is not as specified, go to step  7.
  4. Disconnect MAP sensor 3-pin harness connector. MAP sensor is located at rear of intake manifold. Using jumper wire, jumper MAP sensor harness connector terminals No. 2 (Red wire) and No. 3 (Black wire). Using scan tool, observe MAP sensor voltage parameter. If voltage parameter is about 5 volts, go to step  6. If voltage parameter is not as specified, go to next step.
  5. Check for open or short circuit in Red wire (MAP signal circuit) between PCM and MAP sensor. See WIRING DIAGRAMS article. Check for short to each other in MAP signal and ground circuits. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to step  13.
  6. Replace MAP sensor. See ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION article. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  7. Ensure engine is at operating temperature, minimum 176°F (80°C). Turn ignition on. On scan tool, observe TPS angle parameter while accelerator pedal is pressed slowly to floor. TPS angle should increase smoothly and evenly as specified. See CHECKING THROTTLE POSITION SENSORS table. If TPS angle parameter displays as specified, check for intermittent problem. See DIAGNOSTIC AIDS . If TPS angle parameter does not display as specified, go to next step.
    CHECKING THROTTLE POSITION SENSORS

    Throttle Position Sensor Specification (%)
    Throttle Position Sensor No. 1
    Closed Throttle 8-10
    Wide Open Throttle 90-92
    Throttle Position Sensor No. 2
    Closed Throttle 90-92
    Wide Open Throttle 8-10
  8. Turn ignition off. Disconnect TPS 8-pin harness connector. TPS is located on throttle body, at front of intake manifold. Using scan tool, observe TPS voltage parameter. If TPS voltage parameter is about zero volts, leave harness connector disconnected and go to next step. If voltage parameter is not as specified, go to step  10.
  9. Connect test light between TPS harness connector terminals No. 7 (Blue/White wire) and No. 8 (Red/White wire). See Figure. Using scan tool, observe TPS voltage parameter. If TPS voltage parameter is about 5 volts, leave harness connector disconnected and go to step  12. If voltage parameter is not as specified, go to step  11.
  10. Check TPS2 signal circuit for a short to voltage. See WIRING DIAGRAMS article. Check TPS2 sensor ground circuit for high resistance or faulty connection between PCM harness connector and TPS sensor harness connector. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to step  13.
  11. Check TPS2 signal circuit or 5-volt reference circuit for faulty connection or high resistance between PCM harness connector and TPS sensor harness connector. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to step  13.
  12. Replace TPS. See ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION article. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  13. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT  under POWERTRAIN CONTROL MODULE. Use scan tool to clear DTC and verify repair.
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