Ambient Air Temperature Sensor, Checking

Ambient Air Temperature Sensor, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis

- Connect the scan tool.

- Engine MUST be at room temperature.

- Turn the ignition switch On.

- Using the scan tool, check the ambient air temperature:






- Turn the ignition switch OFF.

If the specified value was obtained:

- Fault may be intermittent. Check for proper connection, damaged wiring or loose terminals.

• On some models the display in the cluster may default to 419 °F if the circuit is open or shorted to ground. The display on the cluster may show 3 dashes on older models when signal voltage is out of range.

If the specified value was Not obtained:

Checking internal resistance

- Disconnect the Ambient Air Temperature Sensor (G17) electrical harness connector.

- Using a multimeter, check the Ambient Air Temperature Sensor (G17) terminals 1 to 2 for resistance.

Use the chart below for the specified values:

Specified values:






If the specified value was Not obtained:

- Replace the Ambient Air Temperature Sensor (G17). Refer to the Repair Information.

If the specified values are obtained, continue the test according to the following table:

Checking wiring

- Turn the ignition switch ON.

- Connect a multimeter to terminals 1 and 2 of the Ambient Air Temperature Sensor (G17) electrical harness connector.

Specified value: near 5.02 V

- Turn the ignition switch OFF.

If the specified value was Not obtained:

- Remove the Instrument Cluster. Refer to the Repair Information.

- Disconnect the Instrument Cluster harness.

- Using a multimeter, check the Ambient Air Temperature Sensor (G17) electrical harness connector terminals 1 and 2 to the Instrument Cluster electrical harness connector for an open circuit or a short, refer to the wiring diagram. Refer to Wiring Diagrams for pin locations.






Specified value: 1.5 ohms max.

If the specified value was Not obtained:

- Check the wiring for an open, high resistance or short circuit to Battery (+) or ground.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Replace the Instrument Cluster. Refer to the Repair Information.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.