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.

- Go to Final procedures

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

If the specified value was Not obtained:

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

- Switch the ignition ON.

Specified value: About 5.0 V

- Switch the ignition OFF.

If the specified value was obtained:

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

- Go to Final procedures

If the specified value was Not obtained:

- Remove the Vehicle electrical system control module (J519). Refer to the appropriate service manual.






- Disconnect the Vehicle electrical system control module (J519) electrical harness connector T32a

- Using a Multimeter, check the Ambient Air Temperature Sensor (G17) electrical harness connector to the Vehicle electrical system control module (J519) electrical harness connector T32a for an open circuit or a short, refer to the appropriate wiring diagram.






Specified value: 1.5 ohms max.

If the specified values were Not obtained:

- Check the wiring connection for an open circuit.

- Check the wiring connection for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

- Go to Final procedures

If the specified value was obtained:

- Replace the Vehicle electrical system control module (J519). Refer to the appropriate service manual.

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 ] Programming and Relearning.