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)		approximate, ambient air temperature

If the specified value was obtained:

-- Fault may be intermittent.

-- Check the wiring connection for an open circuit, short circuit to Battery voltage or Ground

-- 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 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:

AAT Temperature vs Resistance
Temp (C)	min. value ohms	max. value ohms
- 40	31811	37560
- 35	22941	26863
- 25	12415	14289
- 15	6958	7880
- 5	4036	4495
0	3120	3442
5	2422	2655
15	1519	1623
25	968	1031
35	629	676
45	419	455
55	286	314
65	195	217
75	136	155

If any of the specified values were Not obtained:

-- Replace the Ambient Air Temperature Sensor -G17-. Refer to the appropriate service information.

-- Go to Final procedures

If the specified values are obtained:

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

Ambient Air Temperature Sensor -G17- electrical harness connector terminals	Instrument Cluster - J285- electrical connector T32 terminals
1	28
2	24

Specified value: 1.5 Ω max.

If the specified value was obtained:

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

If the specified value was Not obtained:

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

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

-- If necessary, repair the faulty wiring connection.

Final procedures 

-- Reinstall the engine cover with air filter, if necessary. Refer to the appropriate service information.

-- 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 .