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 harness connector of knock sensors.
Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram
Test requirements
- Mounting bolts of knock sensors tightened to 20 Nm.
- Ignition switched off.
Test sequence
Knock Sensor (KS) 1 -G61-
- Disconnect black 3-pin harness connector for knock sensor 1 (arrow).
Knock Sensor (KS) 2 -G66-
- Disconnect black 2-pin harness connector for knock sensor 2 (arrow).
Checking wires to Engine Control Module (ECM)
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test
Knock Sensor (KS) 1 -G61-
- Check wires between test box and 3-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohms
Component Connector Test box
Knock Sensor (KS)
1 -G61- Terminal 1 Socket 106
Terminal 2 Socket 99
Terminal 3 Socket 108
- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: infinity ohm
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. Readiness Code
Knock Sensor (KS) 2 -G66-
- Check wires between test box and 2-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohms
- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: infinity ohm
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. Readiness Code