Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Knock sensor and knock sensor control, checking: Continuation
1996 Audi A4 Base, StandardSECTION Continuation
WARNING: This page is about a different car, the 2001 Audi A6, 2000 Audi A6, 1999 Audi A6, and 1998 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect 3-pin connector from Knock Sensor (KS) 1 - G61-.
- Connect multimeter US1119 (Fluke 83 or equivalent) to measure resistance between connector terminals, using adapters from VW1594 connector test kit.
- Knock sensor terminals 1 and 2
- Knock sensor terminals 1 and 3
- Knock sensor terminals 2 and 3
- Specified value: INIFINITY Ξ©
If resistance is OK (no continuity):
- Connect VAG1598/22 test box to Motronic ECM harness connector. See VAG1598/22 TEST BOX, CONNECTING .
- Check wiring for open circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram.
- Connector terminal 1 to ECM/test box socket 68
- Connector terminal 2 to ECM/test box socket 67
- Connector terminal 3 to ECM/test box socket 67
- Specified value: max. 1.5 Ξ©
- Check wiring for short circuits between terminals of 3 -pin connector, and between connector and ECM/test box.
- Connector terminal 2 to ECM/test box socket 68
- Connector terminal 3 to ECM/test box socket 68
- Specified value: INIFINITY Ξ©
If the wiring is OK:
- Loosen knock sensor and tighten to 20 Nm (15 ft lb).
If the malfunction still exists (stored in DTC memory):
- Replace Knock Sensor (KS) 1 -G61-.
- Check readiness code. See READINESS CODE .
- If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See READINESS CODE, CHECKING .
- Disconnect 3-pin connector from Knock Sensor (KS) 2 -G66-.
- Connect multimeter US1119 (Fluke 83 or equivalent) to measure resistance between connector terminals, using adapters from VW1594 connector test kit.
- Knock sensor terminals 1 and 2
- Knock sensor terminals 1 and 3
- Knock sensor terminals 2 and 3
- Specified value: INIFINITY Ξ©
If resistance is OK (no continuity):
- Connect VAG1598/22 test box to Motronic ECM harness connector. See VAG1598/22 TEST BOX, CONNECTING .
- Check wiring for open circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram.
- Connector terminal 1 to ECM/test box socket 60
- Connector terminal 2 to ECM/test box socket 67
- Connector terminal 3 to ECM/test box socket 67
- Specified value: max. 1.5 INIFINITY Ξ©
- Check wiring for short circuits between terminals of 3 -pin connector, and between connector and ECM/test box.
- Connector terminal 2 to ECM/test box socket 60
- Connector terminal 3 to ECM/test box socket 60
- Specified value: INIFINITY Ξ©
If the wiring is OK:
- Loosen knock sensor and tighten to 20 Nm (15 ft lb).
If the malfunction still exists (stored in DTC memory):
- Replace Knock Sensor (KS) 2 -G66-.
- Check readiness code. See READINESS CODE .
- If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See READINESS CODE, CHECKING .
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.