LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chrysler >> 2000 >> Intrepid R/T >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1398: Misfire Adaptive Numerator At Limit >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P1398: Misfire Adaptive Numerator At Limit: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If GLOBAL GOOD TRIP counter is not displayed or displayed count is not "0", go to next step. If GLOBAL GOOD TRIP counter is displayed and displayed count is "0", go to step  4.
  2. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Turn ignition on, with engine off. Using scan tool in miscellaneous menu, select CLEAR PCM (battery disconnected) to reset PCM. Using scan tool, choose MISFIRE PRETEST screen. Road test vehicle and relearn adaptive numerator. Adaptive numerator is learned when ADAPTIVE NUMERATOR DONE LEARNING line on MISFIRE PRETEST screen changes to YES. Also the 200 REV CNTR line will start to count. If adaptive numerator relearn occurs, go to next step. If adaptive numerator relearn does not occur, go to step  4.
  3. Turn ignition off. Disconnect CKP sensor connector. CKP sensor is mounted to passenger side of transaxle housing, above the differential housing. See Figure. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Ensure CKP sensor mounting bolts are tight. If connector is okay and CKP sensor is tight, no problem is indicated at this time. Test is complete.
  4. Turn ignition off. Disconnect CKP sensor connector. CKP sensor is mounted to passenger side of transaxle housing, above the differential housing. See Figure. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Ensure CKP sensor mounting bolts are tight. If connector is okay and CKP sensor is tight, go to next step.
  5. Remove CKP sensor. Inspect tone wheel/flexplate for damage, foreign material or excessive movement. Repair or replace tone wheel/flexplate as necessary. If tone wheel/flexplate is okay, go to next step.
  6. At this time, CKP sensor is assumed to be defective. Replace CKP sensor.
scientia non olet · About LEMON Manuals