Measure voltage between ECM/PCM connector terminal A26 and body ground. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (A26) and TDC sensor. NO - Go to step 11. Turn the ignition switch OFF. Disconnect ECM/PCM connector A (31P). Check for continuity between ECM/PCM connector terminal A26 and body ground. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Is there continuity? YES - Repair short in the wire between the ECM/PCM (A26) and the TDC sensor. NO - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM.

DTC 10: IAT Sensor Circuit Malfunction Reset the ECM/PCM (see page 11-468). Turn the ignition switch ON (II). Is the MIL on and does it indicate DTC 10? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the IAT sensor and at the ECM/PCM. Turn the ignition switch OFF. Disconnect the IAT sensor 2P connector. Measure resistance between the IAT sensor 2P connector terminals No. 1 and No. 2. IAT SENSOR 2P CONNECTOR Terminal side of male terminals Is there 0.4-4.0 kohms? YES - Go to step 6. NO - Replace the IAT sensor.