Knock Sensors, Checking
Knock Sensors, Checking
NOTE:
- Contact surfaces between knock sensor and cylinder block must be free of corrosion, dirt and grease.
- For the Knock Sensors to function properly, it is important for tightening torque to be exactly 20 Nm.
- Use only gold-plated terminals when servicing terminals in the harness connector.
Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram
Test requirements
- Fuses on E-box in engine compartment, left side, must be OK.
NOTE: Fuses on this fuse holder are labelled "SB" in the wiring diagram.
- Fuses on fuse holder in instrument panel, left side, must be OK.
NOTE: Fuses on this fuse holder are labelled "SC" in the wiring diagram.
- Ground (GND) connections between engine and chassis must be OK.
- mounting bolts of knock sensors tightened to 20 Nm.
- Ignition switched off.
Test sequence:
- Knock Sensor (KS) 1 -G61-
- Knock Sensor (KS) 2 -G66-
Test procedure, Knock Sensor (KS) 1 -G61-
Observe safety precautions
Observe rules for cleanliness
- Disconnect black 3-pin harness connector for Knock Sensor (KS) 1 -G61-.
Checking wires to Engine Control Module (ECM)
- Connect test box to 60-pin connector of wiring harness, connecting test box for wiring test. Test Box, Connecting For Wiring Test
Engine Control Module (ECM) is not connected.
- Check wires between test box and 3-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Terminal 1 + socket 39
Terminal 2 + socket 54
Terminal 3 + socket 52
Wire resistance: max. 3.0 ohms
- Also check wires for short circuit to each other.
Specified value: infinity ohms
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
If no malfunctions are found in wires:
- Replace Knock Sensor (KS) 1 -G61-.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
Test procedure, Knock Sensor (KS) 2 -G66-
Observe safety precautions.
Observe rules for cleanliness.
- Disconnect 2-pin connector from Knock Sensor (KS) 2 -G66- (on intake side at cylinder block).
Checking wires to Engine Control Module (ECM)
- Connect test box to 60-pin connector of wiring harness, connecting test box for wiring test. Test Box, Connecting For Wiring Test
Engine Control Module (ECM) is not connected.
- Check wires between test box and 2-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Terminal 1 + socket 9
Terminal 2 + socket 24
Wire resistance: max. 3.0 ohms
- Also check wires for short circuit to each other.
Specified value: infinity ohms
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
If no malfunctions are found in wires: Replace Knock Sensor (KS) 2 -G66-.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes