P0073-AMBIENT AIR TEMPERATURE SENSOR CIRCUIT HIGH
P0073-AMBIENT AIR TEMPERATURE SENSOR CIRCUIT HIGH
For a complete wiring diagram, refer to the Wiring Information.
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When Monitored:
With the ignition on. Battery voltage greater than 10.4 volts.
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Set Condition:
The Ambient Air Temperature (AAT) sensor circuit voltage at the Totally Integrated Power Module (TIPM) is greater than 4.98 volts for more than 2.8 seconds. One Trip Fault. Three good trips to turn off the MIL.
Possible Causes |
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| (G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE |
| (G31) AAT SIGNAL CIRCUIT OPEN |
| (G931) AAT RETURN CIRCUIT OPEN |
| AAT SENSOR |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
1. AAT SENSOR VOLTAGE ABOVE 4.98 VOLTS
| 1. | Ignition on, engine not running. |
| 2. | With a scan tool, read the AAT voltage. |
Is the voltage above 4.98 volts?
Yes
- Go To 2
No
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Refer to the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
 |
| 1. | Turn the ignition off. |
| 2. | Disconnect the AAT harness connector. |
| 3. | Connect a jumper wire between the (G31) AAT Signal circuit and the (G931) AAT Return circuit in the AAT harness connector. |
| 4. | Ignition on, engine not running. |
| 5. | With a scan tool, read AAT voltage. |
Is the voltage below 1.0 volt with the jumper wire installed?
Yes
- Replace the AAT Sensor.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
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Go To 3
NOTE: Remove the jumper wire before continuing.
3. (G31) AAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
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| 1. | Turn the ignition off. |
| 2. | Disconnect the C4 TIPM harness connector. |
| 3. | Ignition on, engine not running. |
| 4. | Measure the voltage on the (G31) AAT Signal circuit in the AAT Sensor harness connector. |
Is voltage present?
Yes
- Repair the short to battery voltage in the (G31) AAT Signal circuit.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
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Go To 4
4. (G31) AAT SIGNAL CIRCUIT OPEN
 |
| 1. | Turn the ignition off. |
| 2. | Measure the resistance of the (G31) AAT Signal circuit between the AAT Sensor harness connector and C4 TIPM harness connector. |
Is the resistance below 10.0 ohms?
Yes
- Go To 5
No
- Repair the open in the (G31) AAT Signal circuit.
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Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)
- Standard Procedure).
5. (G931) AAT RETURN CIRCUIT OPEN
 |
| 1. | Measure the resistance of the (G931) AAT Return circuit between the AAT Sensor harness connector and the C4 TIPM harness connector. |
Is the resistance below 10.0 ohms?
Yes
- Go To 6
No
- Repair the open in the (G931) AAT Return circuit.
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Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)
- Standard Procedure).
6. TOTALLY INTEGRATED POWER MODULE (TIPM)
| NOTE: | Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. |
| 1. | 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?
Yes
- Repair as necessary.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Replace and program the Totally Integrated Power Module in accordance with the Service Information.
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Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM)
- Standard Procedure).