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6E-86 Engine Control System (4JH1) Step Action Value(s) Yes No 5 1. Turn OFF the ignition. signal circuit and the low reference circuit of the 3. Turn ON the ignition, with the engine OFF. 110°C (230°F) Go to Step 9 Go to Step 6 6 1. Turn OFF the ignition. signal circuit of the IAT sensor harness (pin 1 of 3. Turn ON the ignition, with the engine OFF. 110°C (230°F) Go to Step 8 Go to Step 7 7 1. Test the signal circuit between the ECM (pin 84 of C-57 connector) and the IAT sensor (pin 1 of 2. Repair the circuit(s) as necessary. Go to Step 14 Go to Step 11 8 1. Test the low reference circuit between the ECM (pin 92 of C-57 connector) and the IAT sensor 2. Repair the circuit(s) as necessary. Go to Step 14 Go to Step 11 9 1. Test the signal circuit between the ECM (pin 84 of C-57 connector) and the IAT sensor (pin 1 of 2. Repair the circuit(s) as necessary. Go to Step 14 Go to Step 10 10 1. Turn OFF the ignition. connections at the harness connector of the IAT 3. Repair the connection(s) as necessary. Go to Step 14 Go to Step 12 11 1. Turn OFF the ignition. connections on the IAT sensor circuits at the 4. Repair the connection(s) as necessary. Go to Step 14 Go to Step 13 12 Replace the IAT sensor. Refer to Mass Air Flow Go to Step 14 13 Important: Replacement ECM must be Go to Step 14 |