Diagnostic Test
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FOR AN ACTIVE DTC NOTE:
After the wiring harness is repaired, or the Ambient Air Temperature (AAT) Sensor is replaced, the vehicle MUST be operated for at least five minutes, at above 15 mph (24 km/h). If this is not performed, the AAT Sensor data in the BCM will NOT be updated and may lead to the incorrect replacement of the BCM.
- With the scan tool, read the Body Control Module (BCM) DTCs and record on the repair order.
Is the DTC active?
Yes
- Go To 2
No
- 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. If no problems are found, test complete.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- With the scan tool, read the Body Control Module (BCM) DTCs and record on the repair order.
- CHECK THE AMBIENT AIR TEMPERATURE SENSOR
- Turn the ignition off.
- Disconnect the Ambient Air Temperature Sensor harness connector.
- Turn the ignition on.
- With the scan tool, read the BCM DTCs.
Is the DTC active?
Yes
- Go To 3
No
- Replace the Ambient Air Temperature Sensor in accordance with the Service Information. Refer to SENSOR, AMBIENT TEMPERATURE, REMOVAL .
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- CHECK THE (G31) AAT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
- Turn the ignition off.
- Disconnect the BCM C4/D harness connector.
- Check the continuity between ground and the (G31) AAT Sensor Signal circuit at the Ambient Air Temperature Sensor harness connector.
Is there continuity between ground and the (G31) AAT Sensor Signal circuit?
Yes
- Repair the short to ground in the (G31) AAT Sensor Signal circuit.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
No
- Go To 4
- CHECK THE (G31) AAT SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE (G931) SENSOR GROUND CIRCUIT
- Check the continuity between the (G31) AAT Sensor Signal circuit and the (G931) Sensor Ground circuit at the Ambient Air Temperature Sensor harness connector.
Is there continuity between the (G31) AAT Sensor Signal circuit and the (G931) Sensor Ground circuit?
Yes
- Repair the short between the (G31) AAT Sensor Signal circuit and the (G931) Sensor Ground circuit.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
No
- Replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
- Check the continuity between the (G31) AAT Sensor Signal circuit and the (G931) Sensor Ground circuit at the Ambient Air Temperature Sensor harness connector.