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DTC P1398: Misfire Adaptive Numerator At Limit: Testing

NOTE: Check for any technical service bulletins that may apply to this DTC.
  1. Turn ignition on. Using scan tool, select MISCELLANEOUS MENU, then CLEAR PCM BATTERY DISCONNECT to reset PCM. Select MISFIRE PRETEST. Road test vehicle to relearn adaptive numerator. Adaptive numerator is learned when ADAPTIVE NUMERATOR DONE LEARNING line on scan tool screen changes to YES. If adaptive numerator relearned, go to next step. If adaptive numerator did not relearn, go to step  3 .
  2. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
    • With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
    • Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
    • Refer to any technical service bulletins that may apply.
    • Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
    • Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.

    If a problem is found, repair as necessary. If no problems are found, test is complete.

  3. Visually inspect CKP sensor wiring harness. Check for chafed, pierced, pinched or partially broken wires. See Figure . Visually inspect CKP sensor harness connector for broken, bent, pushed out or corroded terminals. Ensure CKP sensor is properly installed and mounting bolts are tight. Refer to any technical service bulletins that may apply. If any problems are found, repair as necessary. If no problems are found, go to next step.
  4. Turn ignition off. Remove CKP sensor. Inspect tone wheel/flex plate slots for damage, foreign material or excessive movement. If any problems are found, repair or replace tone wheel/flex plate as necessary. If no problems are found, go to next step.
  5. If no other possible causes are remaining, replace CKP sensor.
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