Checking resistances and wires (Vehicles with engine code BDF)
Knock Sensor (KS) 1 -G61-
- Disconnect 3-pin harness connector at right cylinder head for knock sensor 1 (arrow).
- Measure resistance between terminals 1 + 2, 1 + 3, and 2 + 3 at harness connector for Knock Sensor (KS) 1 -G61-.
Specified value: INFINITY Ω
Courtesy of VOLKSWAGEN OF AMERICA, INC.
Knock Sensor (KS) 2 -G66-
- Disconnect 2-pin harness connector from knock sensor 2 (arrow, at intake manifold side of cylinder block)
- Now measure resistance between terminals 1 + 2 at connector for Knock Sensor (KS) 2 -G66-.
Specified value: INFINITY Ω
- Connect test box to control module wiring harness. See CONNECT TEST BOX FOR WIRING TEST
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Knock Sensor (KS) 1 -G61-
- Check wires between test box and 3-pin connector for open circuits according to wiring diagram.
Terminal 2 + socket 106
Terminal 2 + socket 99
Terminal 3 socket 108
Wire resistance: max: 1.5 Ω
- Also check wires for short circuit to each other.
Specified value: INFINITY Ω
Knock Sensor (KS) 2 -G66-
- Now check wires between test box and 2-pin connector for open circuits according to wiring diagram.
Terminal 2 + socket 107
Terminal 2 + socket 99
Wire resistance: max: 1.5 Ω
- Also check wires for short circuit to each other.
Specified value: INFINITY Ω
If no malfunctions are found in wires:
- Replace the respective knock sensor:
- Erase DTC memory of Engine Control Module (ECM). See DIAGNOSTIC MODE 4: RESET/ERASE DIAGNOSTIC DATA .
- Generate readiness code. See READINESS CODE, GENERATING .
Fig 1: Disconnecting 3-Pin Harness Connector At Right Cylinder Head For Knock Sensor 1 (Engine Code BDF)
Fig 4: Measuring Resistance Between Terminal 1 & 2 At Connector For Knock Sensor 2 (Engine Code BDF)