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1997 FORD EXPLORER
5.0L V8•AWD•AUTOMATIC•gas
12 active safety recalls on this vehicle — view recalls
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Repairs0Labor539Torque3620Fluid9DTC683Battery1Maintenance0Recalls12
P1309moderate severityPowertrain

Misfire Detection Monitor Disabled

on 1997 Ford Explorer 5.0L V8 · AWD

What this code means

The PCM misfire detection monitor is disabled or not functioning. The camshaft position sensor synchronizer may not be providing the correct signal needed for accurate misfire detection. Common on Ford 3.0L, 3.8L, and 4.2L engines.

Symptoms

  • Check Engine Light
  • Possible rough running
  • Other misfire codes may not set properly
  • Failed emissions test

Common causes

  • Incorrectly installed camshaft position sensor synchronizer
  • Faulty camshaft position sensor
  • Damaged CMP sensor wiring
  • CMP sensor synchronizer gear misaligned

Diagnostic steps

  1. Check camshaft position sensor signal on scan tool
  2. Verify CMP synchronizer is correctly installed and aligned
  3. Test CMP sensor resistance and signal
  4. Inspect CMP wiring and connector

Repair notes

Verify CMP synchronizer alignment. Replace CMP sensor if signal is weak or absent.

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