Knock Sensor 1 -G61-, 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 Knock Sensor 1 -G61- is a tuned accelerometer on the engine which converts engine vibration to an electrical signal. The Engine Control Module -J623- uses this signal to determine the presence of engine knock and to retard spark timing, if necessary.
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: Knock Sensor 1 -G61- harness connector.
- CHECK: Knock Sensor 1 -G61- component connector terminals 1 to 2 for resistance.
- SPECIFIED VALUE: 2, 250 Ω (+/- 750 Ω @ approx. 20° C).
-- Was Value obtained? |
-- YES:
-- NO:
- REPLACE: Knock Sensor 1 -G61-. Refer to appropriate repair information.
- GO TO: Step 4
|
| 3 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
- CHECK: Knock Sensor 1 -G61- harness connector terminal 1 to the Engine Control Module - J623- harness connector T60 / 9 for resistance.
- CHECK: Knock Sensor 1 -G61- harness connector terminal 2 to the Engine Control Module - J623- harness connector T60 / 24 for resistance.
- CHECK: Knock Sensor 1 -G61- harness connector terminal 3 to the Engine Control Module - J623- harness connector T60 / 52 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- Were Values obtained? |
-- YES:
- TIP: The Knock Sensor 1 -G61- may fail under loaded operation; please swap a known good Knock Sensor 1 -G61- 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: Engine Control Module -J623- harness connector for any damaged, pushed-out pins.
- REPAIR: As necessary.
- If all electrical connections are OK:
- REPLACE: Engine Control Module -J623-. 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.
|