For a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on. Battery voltage greater than 10 volts.Set Condition:The Ambient Temperature Sensor voltage is greater than 4.98 volts at the PCM for 2.8 seconds. One Trip Fault. Three good trips to turn off the MIL.Possible Causes(G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE(G31) AAT SIGNAL CIRCUIT OPEN(G931) SENSOR GROUND CIRCUIT OPENAMBIENT AIR TEMPERATURE SENSORTOTALLY INTEGRATED POWER MODULEAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).1. AAT SENSOR VOLTAGE ABOVE 4.98 VOLTSIgnition on, engine not running.With a scan tool, read the Ambient Air Temperature Sensor voltage.Is the voltage above 4.98 volts?YesGo To2NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. AAT SENSOR

Turn the ignition off.Disconnect the Ambient Air Temperature Sensor harness connector.Connect a jumper wire between the (G31) AAT Signal circuit and the (G931) Sensor ground circuit in the AAT Sensor harness connector.Ignition on, engine not running.With a scan tool, read AAT Sensor voltage.Is the voltage below 1.0 volt with the jumper wire installed?YesReplace the Ambient Air Temperature Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoGo To 3Remove the jumper wire before continuing.3. (G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Turn the ignition off.Disconnect the C4 TIPM harness connector.Ignition on, engine not running.Measure the voltage on the (G31) AAT Signal circuit in the AAT Sensor harness connector.Is the voltage above 0 volts?YesRepair the short to battery voltage in the (G31) AAT Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoGo To 44. (G31) AAT SIGNAL CIRCUIT OPEN

Turn the ignition off.Measure the resistance of the (G31) AAT Signal circuit from the AAT Sensor harness connector to the C4 TIPM harness connector.Is the resistance below 5.0 ohms?YesGo To 5NoRepair the open in the (G31) AAT Signal circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 5. (G931) SENSOR GROUND CIRCUIT OPEN

Measure the resistance of the (G931) Sensor ground circuit from the AAT Sensor harness connector to the C4 TIPM harness connector.Is the resistance below 5.0 ohms?YesGo To 6NoRepair the open in the (G931) Sensor ground circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 6. TOTALLY INTEGRATED POWER MODULEBefore continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were there any problems found?YesRepair as necessary.Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)NoReplace the Totally Integrated Power Module per Service Information.Perform BODY VERIFICATION TEST VER - 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)