
5-21
7. CKP sensor check
-1. Connect the Dr. H and clear the DTC once.
-2. Start the engine and let it run at idling under no load.
Check the DTC with the Dr. H.
Does the DTC 4-1 appear?
YES – Replace the CKP sensor and recheck. If
the DTC 4-1 appears again, substitute a
known-good ECM and recheck.
NO – End of the check
DTC 4-2: CKP pulse is abnormal
1. Symptom reproduction test
-1. Connect the Dr. H and clear the DTC once. If the
DTC can not be cleared, go on the troubleshooting.
-2. Start the engine and let it run at idling under no load.
-3. Check the DTC with the Dr. H.
Does the DTC 4-2 appear?
YES – Check the crank pulse plate for deforma-
tion and damage. Replace the crank pulse
plate with a new one if it is deformed or
damaged, and check again. If abnormal,
replace the CKP sensor and check. If the
DTC 4-2 still appears, replace the ECM.
NO – Temporary failure (Disappeared)
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