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Home >> Jaguar >> 2000 >> XJ8 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Code Identification >> DTC P1631: Throttle Motor Relay Coil Activation Circuit Failure >> Diagnostic Test Procedure

Diagnostic Test Procedure

  1. Disconnect negative battery cable. Remove the throttle motor relay. Disconnect ECM connector EM80. Measure resistance between the throttle motor relay connector terminal No. 5 and ECM harness connector EM80 terminals No. 8 and 9. Is either resistance greater than 5 ohms? If yes, repair high resistance in appropriate circuit. If no, go to next step.
  2. Reconnect negative battery cable. Turn ignition on. Measure voltage between the throttle motor relay connector terminal No. 5 and ground. Is voltage greater than 1 volt? If yes, repair short to voltage. If no, go to next step.
  3. Turn ignition off. Measure resistance between the throttle motor relay connector terminal No. 5 and ground. Is resistance less than 10,000 ohms? If yes, repair short to ground. If no, install a new throttle body.
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