5000 - 5999: 5106

5106-IMPLAUSIBLE AMBIENT TEMPERATURE MESSAGE RECEIVED

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on and battery voltage greater than 10 volts.

- Set Condition:
The PCM detects that the Ambient Air Temperature (AAT) Sensor input voltage is not within a specified range based on operating conditions.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

Diagnostic Test

1. DTC IS ACTIVE

NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.

Turn the ignition on.
With the scan tool, read DTCs.
Record all DTC and applicable Freeze Frame information.
With the scan tool, clear DTCs.
Cycle the ignition off for at least one minute.
Start the engine and allow it to reach 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 fitting clothing. Failure to follow these instructions can result in personal or fatal injury.

With the scan tool, read DTCs.
Does this DTC reset?

Yes

- Go to 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Component Tests and General Diagnostics

2. AMBIENT TEMPERATURE SENSOR WIRING AND CONNECTORS
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Ambient Temperature Sensor and the Body Control Module.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Inspect the Ambient Temperature Sensor for any condition that would result in an incorrect signal, such as damage, corrosion, or contamination.
Were any problems found?

Yes

- Repair as necessary.
- Perform the Body Verification Test Ver. 1.Verification Tests

No

- Go to 3

3. AAT SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the Ambient Temperature Sensor connector.
Disconnect the Body Control Module connector.
Measure the resistance between ground and the AAT Signal circuit in the Ambient Temperature Sensor harness connector.
Is the resistance above 100 ohms?

Yes

- Go to 4

No

- Repair the AAT Signal circuit for a short to ground.
- Perform the Body Verification Test Ver. 1.Verification Tests

4. AAT SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
Measure the resistance between the AAT Signal circuit and the Sensor Ground circuit in the Ambient Temperature Sensor harness connector.
Is the resistance above 100 ohms?

Yes

- Go to 5

No

- Repair the AAT Signal circuit for a short to the Sensor Ground circuit.
- Perform the Body Verification Test Ver. 1.Verification Tests

5. AAT SIGNAL CIRCUIT OPEN CIRCUIT OR HIGH RESISTANCE

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the AAT Signal circuit between the Ambient Temperature Sensor harness connector and the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?

Yes

- Go to 6

No

- Repair the AAT Signal circuit for an open circuit or high resistance.
- Perform the Body Verification Test Ver. 1.Verification Tests

6. AMBIENT TEMPERATURE SENSOR
Turn the ignition off.
Connect the Body Control Module connector.
Turn the ignition on.
With the scan tool, read the Ambient Temperature Sensor signal voltage.

NOTE: The sensor voltage should be greater than 4.8 volts with the connector disconnected.

Does the scan tool display the voltage as described above?

Yes

- Replace the Ambient Temperature Sensor.
- Perform the Body Verification Test Ver. 1 Verification Tests.

No

- Go to 7

7. BODY CONTROL MODULE
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Ambient Temperature Sensor and the Body Control Module.
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the Body Verification Test Ver. 1Verification Tests.

No

- Replace and program the Body Control Module.
- Perform the Body Verification Test Ver. 1 Verification Tests.