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Home >> Jaguar >> 2002 >> XKR Base, 2D Convertible >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Code Identification >> DTC P1658: Throttle Motor Power Relay On Failure >> Diagnostic Test Procedure

Diagnostic Test Procedure

NOTE: Before beginning this test procedure, make sure the throttle motor power relay contacts are not stuck on.
  1. Disconnect negative battery cable. Remove the throttle motor power relay. Disconnect ECM connector EM82. Measure resistance between the throttle motor power relay connector terminal No. 2 and ECM harness connector EM82 terminal No. 6. Is resistance greater than 5 ohms? If yes, repair high resistance between the throttle motor power relay connector terminal No. 2 and ECM harness connector EM82 terminal No. 6. If no, go to next step.
  2. Reconnect negative battery cable. Turn ignition on. Measure voltage between the throttle motor power relay connector terminal No. 2 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 power relay connector terminal No. 2 and ground. Is resistance less than 10,000 ohms? If yes, repair short to ground. If no, go to next step.
  4. Disconnect ECM connector EM80. Measure voltage between the throttle motor power relay connector terminal No. 5 and ground. Is voltage greater than 1 volt? If yes, repair short to voltage. If no, clear codes and retest system. If DTC resets, possible ECM failure.
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