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Home › Saturn › 1998 › SC2 Automatic, MP6 › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › Diagnostic Trouble Codes › DTC P1693 - Tachometer Circuit Fault › Diagnostic Procedures

Diagnostic Procedures

  1. Start engine. Using scan tool, check if DTC P1693 is active. If DTC is active, go to next step. If DTC is not active, problem is intermittent. See DIAGNOSTIC AIDS.
  2. Turn ignition off for 10 seconds. Turn ignition on. Check if DTC P1693 is still active. If DTC is active, go to next step. If DTC is not active, go to step 4).
  3. Using a DVOM, backprobe tachometer diagnostic feedback circuit at PCM harness connector. If battery voltage is present, check for terminal tightness or faulty PCM. If battery voltage is not present, check circuit for open or short to ground. Repair as necessary. If circuit is okay, check for terminal tightness at instrument cluster, open or short to ground in PC board to tachometer.
  4. Turn ignition off. Disconnect I/P harness connector. Turn ignition on. If DTC P1693 is still active, check PC board in instrument cluster for short to voltage or faulty tachometer. If DTC P1693 is not active, check circuit between tachometer and PCM for short to voltage or faulty PCM.
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