Running Through The Diagnostic Operating Cycle

Check all diagnostic functions as follows.

• 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
• For all diagnostics to be carried out, the engine coolant temperature (ECT) must be between -7 °C and +35 °C when the engine is started before the test
• Ensure that there are no diagnostic trouble codes (DTCs) stored in the engine control module (ECM) before carrying out verification.

Schedule: 

• Switch on the ignition for 5 seconds
• Switch off the air conditioning (A/C)
• Start the engine. Allow the engine to idle for 10-20 seconds
• Accelerate gently to 70-80 km/h
• Drive at a steady throttle opening at 70-80 km/h for 15 minutes
• Engine brake down to 30 km/h (fully released accelerator pedal (AP))
• Stop the car. Leave the engine running
• Idle the engine for 1 minute
• Accelerate to 70-80 km/h (for manual transmissions, first gear up to 40 km/h in 5 seconds)
• Switch on the air conditioning (A/C)
• Drive at a steady throttle opening at 70-80 km/h for 5 minutes
• Stop the car. Leave the engine running. Read off the data.