Is a problem found?
YES – Repair in the signal wire between ECM and the CKP sensor. 
NO – Go to step 8.
- Connect the CKP sensor 3P connector.
- Turn the ignition switch ON (II).
- Check the CKP sensor ground circuit for open or short to ground.
Is about 0 V indicated?
YES – Go to step 11.
NO – Repair in the ground wire between ECM and the CKP sensor.
- Check for the following conditions:
- Damage to the CKP sensor (A)
- CKP sensor fixing condition.
Is a problem found?
YES – Repair as necessary.
NO – Go to step 12.
- Replace the CKP sensor.
- Check the engine speed (cranking speed) with the scan tool.
Turn the ignition switch to start (III).
Is about 0 rpm (min-1) indicated?
YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.
NO – Repair the CKP signal plate.