1351

Possible Causes

• •Adaptive dwell is disabled
• •Ambient conditions exceeding 85C on a continuous basis or 125C for short intervals
• •Ambient conditions exceeding 85°C on a continuous basis or 125°C for short intervals
• •Ambient temperatures exceeding 85C continuously or 125C for short intervals
• •Charring or arcing around the spark plugs
• •Coil resistance out of specifications
• •Dwell time set too long in diagnostic calibration
• •Dwell time set too long in the diagnostic calibration
• •Ignition/spark drive circuitry (internal to the ECM) is overheating
• •Incorrect plug gap
• •Incorrect plug gap on the associated cylinder
• •Loose connections at the coil and spark plugs
• •Low-quality coils with a history of internal arcing or other failures
• •Short internal to the coil
• •Spark plug or coil failure
• •Use of low-quality coils with a history of internal arcing or other failures

Suggested Actions

1. 1Check coil resistance and verify that it is within specifications
2. 2Check coil resistance and verify that it is within specifications.
3. 3Check for loose connections at the coil and spark plugs
4. 4Check for loose connections at the coil and spark plugs.
5. 5Check plug gap on the cylinder associated with the fault
6. 6Check plug gap on the cylinder associated with the fault.
7. 7Ensure the use of high-quality coils without a history of internal arcing or other failures
8. 8Ensure the use of high-quality coils without a history of internal arcing or other failures.
9. 9Look for a short internal to the coil
10. 10Look for a short internal to the coil.
11. 11Look for evidence of charring or arcing around the spark plugs
12. 12Look for evidence of charring or arcing around the spark plugs.
13. 13Verify that adaptive dwell is enabled
14. 14Verify that ambient conditions are not exceeding 85C on a continuous basis or 125C for short intervals, and verify if the fault stops occurring when ambient temperatures are lower
15. 15Verify that ambient conditions are not exceeding 85C on a continuous basis or 125C for short intervals.
16. 16Verify that ambient conditions are not exceeding 85°C on a continuous basis or 125°C for short intervals, and check if the fault stops occurring when ambient temperatures are lower
17. 17Verify that this fault stops occurring when ambient temperatures are lower.
18. 18Verify the dwell time set in the diagnostic calibration is not set too long
19. 19Verify the dwell time set in the diagnostic calibration is not set too long and that adaptive dwell is enabled
20. 20Verify the dwell time set in the diagnostic calibration is not set too long and that adaptive dwell is enabled.

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