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.

- Switch the ignition on.

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





If the specified value was obtained:

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

• The reading will default to 419 °F if the circuit is open or shorted to ground.

If the specified value was Not obtained:

Checking internal resistance

- Turn the key off.

- 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 values were Not obtained:

- Replace the Ambient Air Temperature Sensor (G17). Refer to the appropriate service manual.

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

Checking wiring

- Turn the key 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

If the specified value was Not obtained:

- Turn the key off.

- Remove the Instrument Cluster. Refer to the appropriate service manual.

- 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 T36 for an open circuit or a short, refer to the appropriate wiring diagram.





Specified value: 1.5 ohms max.

If the specified value was obtained:

Replace the Instrument Cluster. Refer to the appropriate service manual.

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.

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 ] Scan Tool Testing and Procedures.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Scan Tool Testing and Procedures.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Readiness Code.