1.
Check Knock sensor
(1)
Substitute with a known - good Knock sensor and check for proper operation.
(2)
Is the signal normal?
YES
a.
Replace Knock sensor and go to "Verification of Vehicle Repair" procedure.
NO
a.
Substitute with a known - good ECM and check for proper operation.
If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure.
