Checking Knock Sensors Audi A8 D3

Component location of connectors. See COMPONENT LOCATIONS, OVERVIEW .

Scheme 15

1. Disconnect harness connector for relevant knock sensor in engine compartment.
2. Check for short circuits between all three terminals in knock sensor connector (terminals 1 + 2, 1 + 3 and 2 + 3). Specification: There must be no contact between wires (infinite ohms).

If there is a connection between the terminals.

1. Replace knock sensor.

If there is no short circuit

1. Check wiring for knock sensors.

Scheme 16

1. Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to engine control module itself. See «WIRING AND COMPONENT CHECK WITH VAG1598/31 TEST BOX»(ref-216438-S11057563412006020800000) .
2. Check wiring connection from relevant sensor connector to engine control module for open circuit and/or short to B+ or Ground (GND). KNOCK SENSOR - OPEN CIRCUIT AND/OR SHORT TO GROUND CHECK Knock Sensor (KS) 1 -G61- (Bank 1) 3-pin connector on wiring harness, socket VAG1598/31 test box, socket 1 (Ground (GND)) 99 2 (signal) 106 3 (shielded) 108 Knock sensor (KS) 2 -G66 (Bank 2) 3-pin connector on wiring harness, socket VAG1598/31 test box, socket 1 (Ground (GND)) 99 2 (signal) 107 3 (shielded) 108 Resistance in wiring: max. 1.5 ohm See SYSTEM WIRING DIAGRAM .
3. Repair any open/short circuit as necessary.
4. Display readiness code. See «READINESS CODE, CHECKING»(ref-216437-S40758807032006020800000) . If DTC memory was erased generate readiness code. See «READINESS CODE, GENERATING»(ref-216437-S25676712792006020800000) .