Engine Control Module, Verifying Repairs: Conditions
- If the engine control module (ECM) has been without power the engine must be started a few times before the test is carried out
- If the vehicle has been without power and misfire-related diagnostic trouble codes (DTCs) are being verified, a flywheel adaptation must be carried out before verification. See MISFIRE DIAGNOSTIC
- The test must take place on a road with little traffic where it is possible to drive slowly and stop at the side of the road
- The air conditioning (A/C) can be on when the engine is running (at part load) but must be switched off before the engine is run at idle speed
- Ensure that there are no diagnostic trouble codes (DTCs) stored in the system before commencing test driving
- Start the engine. Drive according to driving schedule below
- Some equipment, such as air conditioning (A/C) and automatic transmission, is model specific. Ignore these in the driving schedule if the equipment is not present.