Ambient Air Temperature Sensor, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test procedure 

-- Perform a preliminary check to verify the customers complaint. Refer to 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:

Diagnostic text		Specified value
Ambient Air Temperature (AAT)		approx. 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

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 information.

-- Go to Final procedures

If the specified value was Not obtained:

-- Remove the Vehicle electrical system control module -J519-. Refer to the appropriate service information.

-- 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.

Ambient Air Temperature Sensor -G17- harness connector terminals	Vehicle electrical system control module -J519- connector T32a terminals
1	25
2	10

Specified value: 1.5 Ω 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 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 .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .