Circuit Test Aa - Electronic Control Module (ECM) Diagnosis
- Code 11 And/Or 88 Or 89: Electrical Disturbance Check Record all trouble codes. Drive vehicle above 25 MPH to clear memory. Recheck for trouble codes. If Codes 11 and/or 88 or 89 set again, replace ECM. If no trouble codes are indicated or any other code appears, service appropriate code.
- Code 12: ECM Failure If trouble Code 12 appears, replace ECM.