|
|
• When Monitored: • Set Condition: Possible Causes (G31) AAT SIGNAL CIRCUIT SHORTED TO GROUND (G31) ATT SIGNAL CIRCUIT SHORTED TO THE (K300) SENSOR GROUND CIRCUIT AMBIENT AIR TEMPERATURE SENSOR CAN C BUS CIRCUITS OPEN OR SHORTED BCM PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. AAT SENSOR VOLTAGE BELOW 0.078 OF A VOLT NOTE: Diagnose any CAN C Bus Communication DTCs before continuing. With a scan tool, read the Ambient Air Temperature Sensor voltage. Is the voltage below 0.078 of a volt? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. CHECKING AAT SENSOR Turn the ignition off. Disconnect the Ambient Air Temperature Sensor harness connector. Ignition on, engine not running. With a scan tool, read the AAT Sensor voltage. Is the voltage above 4.6 volts? Yes >> Replace the Ambient Temperature Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 3 9 - 54 ENGINE ELECTRICAL DIAGNOSTICS KJ |