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Home >> Jaguar >> 2000 >> XJ8 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Code Identification >> DTC P1121: Pedal Position Sensor Circuit Range/Performance >> Diagnostic Test Procedure

Diagnostic Test Procedure

  1. Disconnect negative battery cable. Disconnect ECM connector EM81. Disconnect the PPS connector. Measure resistance between ECM harness connector EM81 terminal No. 9 and PPS harness connector terminal No. 4. Is resistance greater than 5 ohms? If yes, repair high resistance between ECM harness connector EM81 terminal No. 9 and PPS harness connector terminal No. 4. If no, go to next step.
  2. Reconnect negative battery cable. Turn ignition on. Measure voltage between PPS terminal No. 4 and ground. Is voltage greater than 5 volts? If yes, repair short to voltage. If no, go to next step.
  3. Turn ignition off. Measure resistance between PPS terminal No. 4 and ground. Is resistance less than 10,000 ohms? If yes, repair short to ground. If no, go to next step.
  4. Reconnect ECM connector EM81. Turn ignition on. Measure voltage between PPS terminal No. 1 and ground. Is voltage less than 4 volts? If yes, go to next step. If no, go to step  6.
  5. Turn ignition off. Disconnect ECM connector EM83. Measure resistance between ECM harness connector EM83 terminal No. 5 and PPS harness connector terminal No. 1. Is resistance greater than 5 ohms? If yes, repair high resistance between ECM harness connector EM83 terminal No. 5 and PPS harness connector terminal No. 1. If no, check ECM power supplies. See DTC P0560: VEHICLE VOLTAGE MALFUNCTION .
  6. Measure resistance between PPS terminal No. 3 and ground. Is resistance greater than 5 ohms? If yes, go to next step. If no, install a new APP sensor.
  7. Disconnect ECM connector EM83. Measure resistance between ECM harness connector EM83 terminal No. 13 and PPS harness connector terminal No. 3. Is resistance greater than 5 ohms? If yes, repair high resistance between ECM harness connector EM83 terminal No. 13 and PPS harness connector terminal No. 3. If no, check ECM grounds. If ECM grounds are okay, possible ECM failure.
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