Outside Air Temperature Sensor -G17-, CHECKING
WARNING: This page is about a different car, the 2010 Audi Q7, 2009 Audi Q7, 2008 Audi Q7, and 2007 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.
General Description
The ambient or Outside Air Temperature Sensor -G17- is a negative temperature coefficient (NTC) sensor that informs the semiautomatic / automatic temperature control system of outside air temperature. An NTC sensor resistance decreases as the temperature increases. The computer uses this input along with different in-car temperature sensors to control temperature and blower speed. When there is a problem with this sensor, performance will suffer and the A/C compressor clutch may not engage.
Special tools and workshop equipment required
- Multimeter.
- Wiring Diagram.
- Scan Tool.
Test Requirements
- Fuses OK.
- Battery voltage OK.
- Switch OFF all electrical and electronic accessories.
- Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
- Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
- Coolant Temperature: ≥ 80° C.
- Observe all safety precautions:
.
- View clean working conditions:
.
- For Hybrid vehicles refer to:
.
Test Procedure
| Step |
Procedure |
Result / Action to Take |
| 1 |
- PERFORM: Preliminary Check to verify the customers complaint. Refer to
.
-- Was Complaint verified? |
-- YES:
-- NO:
- GATHER more information from customer about the complaint.
|
| 2 |
- IGNITION: OFF.
- DISCONNECT: Outside Air Temperature Sensor -G17- harness connector.
- CHECK: Outside Air Temperature Sensor -G17- component connector terminals 1 to 2 for resistance.
- SPECIFIED VALUE: 1, 300 Ω (+/- 500 Ω @ approx. 20° C).
-- Was Value obtained? |
-- YES:
-- NO:
- REPLACE: Outside Air Temperature Sensor -G17-. Refer to appropriate repair information.
- GO TO: Step 4
|
| 3 |
- REMOVE: Vehicle Electrical System Control Module -J519-. Refer to appropriate repair information.
- CHECK: Outside Air Temperature Sensor -G17- harness connector terminal 1 to the Instrument Cluster Control Module -J285- harness connector T32a / 5 for resistance.
- CHECK: Outside Air Temperature Sensor -G17- harness connector terminal 2 to the Instrument Cluster Control Module -J285- harness connector T32a / 9 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- Were Values obtained? |
-- YES:
- TIP: The Outside Air Temperature Sensor -G17- may fail under loaded operation; please swap a known good Outside Air Temperature Sensor -G17- prior to continuing to the next step.
- GO TO: Step 4
-- NO:
- PERFORM: Visual Inspection of wiring and component.
- CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals.
- REPAIR: Faulty wiring or connector.
- GO TO: Step 4
|
| 4 |
- Final Procedure
- Perform a road test to verify repair.
-- Does the original DTC return? |
-- YES:
- CHECK: Instrument Cluster Control Module -J285- harness connector for any damaged, pushed-out pins.
- REPAIR: As necessary.
- If all electrical connections are OK:
- REPLACE: Instrument Cluster Control Module -J285-. Refer to appropriate repair information.
- Clear the DTCs. Refer to
.
- Repair is complete. Generate Readiness Code. Refer to
.
- Return vehicle to Customer.
-- NO:
- Perform the diagnostic procedure for any DTC's.
- If no DTC's return, the repair is complete.
- Return vehicle to customer.
|