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Engine Control System (4JH1) 6E-75 4 1. Test the signal circuit between the engine • A short to ground 2. Repair the circuit(s) as necessary. Did you find and correct the condition? — Go to Step 8 Go to Step 6 5 Replace the IAT sensor. Refer to Mass Air Flow Did you complete the replacement? — Go to Step 8 — 6 1. Turn OFF the ignition. 2. Disconnect the ECM harness connector. 3. Inspect connections on the IAT sensor circuits 4. Repair or clean the connection(s) as Did you find and correct the condition? — Go to Step 8 Go to Step 7 7 Important: Replace the ECM. Refer to Engine Control Module Did you complete the replacement? — Go to Step 8 — 8 1. Reconnect all previously disconnected 2. Clear the DTCs with the Tech 2. 3. Turn OFF the ignition for 30 seconds. 4. Start the engine. 5. Monitor the DTC Information with the Tech 2. Did the DTC fail this ignition? — Go to Step 2 Go to Step 9 9 Observe the DTC Information with the Tech 2. Are there any DTCs that you have not diagnosed? — Go to Diagnostic Trouble Code (DTC) List System OK Step Action Value(s) Yes No |