Totally Integrated Power Module (TIPM)
P0073-AMBIENT AIR TEMPERATURE SENSOR CIRCUIT HIGH
- When Monitored:
With the ignition on.
Battery voltage greater than 10.4 volts.
- Set Condition:
The Totally Integrated Power Module (TIPM) detects that the Ambient Air Temperature Sensor input voltage is above the maximum acceptable value.
1. DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
NOTE: Diagnose and repair any system voltage DTCs before continuing with this test.
1. Start the engine and allow it to reach normal operating temperature.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
2. With the scan tool, select View DTCs.
Is the DTC Active at this time?
Yes
- Go To 2
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
2. (G31) AAT SIGNAL CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Ambient Air Temperature Sensor harness connector.
3. Disconnect the TIPM C4 harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (G31) AAT Signal circuit in the Ambient Air Temperature Sensor harness connector.
Is there any voltage present?
Yes
- Repair the short to voltage in the (G31) AAT Signal circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test
No
- Go To 3
3. (G31) AAT SIGNAL CIRCUIT OPEN
1. Turn the ignition off.
2. Measure the resistance of the (G31) AAT Signal circuit between the Ambient Air Temperature Sensor harness connector and the TIPM C4 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Go To 4
No
- Repair the open in the (G31) AAT Signal circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
4. (G931) SENSOR GROUND CIRCUIT OPEN
1. Measure the resistance of the (G931) Sensor Ground circuit between the Ambient Air Temperature Sensor harness connector and the TIPM C4 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Go To 5
No
- Repair the open in the (G931) Sensor Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
5. AMBIENT AIR TEMPERATURE SENSOR
1. Turn the ignition off.
2. Connect the TIPM C4 harness connector.
3. Connect a jumper wire between the (G31) AAT Signal circuit and the (G931) Sensor Ground in the Ambient Air Temperature Sensor harness connector.
4. Turn the ignition on.
5. With the scan tool, read the Ambient Air Temperature Sensor signal voltage.
Is the voltage below 1.0 volt with the jumper wire in place?
Yes
- Verify there is good pin to terminal contact in the AAT Sensor and TIPM connectors. If OK, replace the Ambient Air Temperature Sensor if no problems were found with the connectors.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Go To 6
6. TOTALLY INTEGRATED POWER MODULE (TIPM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Ambient Air Temperature Sensor and the Totally Integrated Power Module (TIPM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Verify that there is good pin to terminal contact in the AAT Sensor and Totally Integrated Power Module connectors.
5. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
6. Look for the data to change or for the DTC to reset during the wiggle test.
7. Perform any Technical Service Bulletins (TSB)s that may apply.
Were any problems found?
Yes
- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.
No
- Replace and program the TIPM.
- Perform the BODY VERIFICATION TEST. Body Verification Test.