With Manufacturer's Scan Tool
Knock Sensors, Checking
NOTE:
- Intake manifold must be removed to remove and install the knock sensors.
- Knock sensor tightening torque of 20 Nm (15 ft lb) must be maintained to ensure the knock sensors perform perfectly.
- Only gold-plated terminals may be used when servicing the knock sensor connector terminals.
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
- VAG 1551/1552 Scan Tool using VAG 1551/3 adaptor cable
- VAG 1598/22 Test Box
- Fluke 83 multimeter
- VW 1594 Adaptor kit
- Wiring diagram
Test conditions
- On Board Diagnostic must store a malfunction for one or both knock sensors.
Function, checking
- Connect VAG 1551/1552 Scan Tool. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks" Testing and Inspection
- Start engine and let idle.
- Press 0 and 1 buttons to select "Address word" 01: "Engine electronics"
06A906018AB Motronic M5.9.2 HS V06
-> Coding 00000 WSC 00000
Display will appear as shown (example only)
- Press -> button.
Rapid data transfer HELP
Select function XX
Display will appear as shown
- Press 0 and 8 buttons to select Function 08: "Read measuring value block"
- Press Q button to enter input.
Read measuring value block HELP
Input Display group number XXX
Display will appear as shown
- Press 0, 2 and 2 buttons to select "Display group 22" (cylinders 1 and 2),
and/or
- Press 0, 2 and 3 buttons to select "Display group 23" (cylinders 3 and 4).
- Press Q button to enter input.
Read measuring value block 22 ->
1 2 3 4
Display will appear as shown (1 to 4 = Display zones)
- Take a test drive and check specified values for knock control on Scan Tool display (display fields 3 and 4).
NOTE: Knock sensor checking must be conducted during a test drive since the knock sensor diagnostic is active at an engine speed greater than 3000 RPM and an engine load greater than 3 ms.
Observe the appropriate safety precautions during test drive.
If specifications obtained
- Press -> button.
Rapid data transfer HELP
Select function XX
Display will appear as shown
- Press 0 and 6 buttons to select Function 06: "End output."
- Press Q button to enter input.
- Switch OFF ignition.
- Display Readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Displaying Readiness Code", Testing and Inspection
If DTC memory has been erased or ECM was disconnected from Battery + :
- Set Readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Setting Readiness Code", Testing and Inspection
Display group 22/23, evaluating
Wiring resistance, checking
- Disconnect 2-pin harness connector to knock sensor -1- G61 and/or 2-pin harness connector to knock sensor -2- G66.
- Measure resistance between terminals 1 + 2 at knock sensor connections.
- Specification Infinity Ohms
- Connect VAG 1598/22 Test Box to ECM harness connector.
- Check wiring for open circuit between Test Box and 2-pin harness connector using wiring diagram.
- G61:
Terminal 1 + socket 68, Terminal 2 + socket 67
- G66:
Terminal 1 + socket 60, Terminal 2 + socket 67
- Wire resistance: 1.5 Ohms maximum
- Check wiring at socket 67 for short to sockets 60 and 68.
- Specification: Infinity Ohms
If wiring OK
- Loosen knock sensor and re-torque to 20 Nm (15 ft lb).
- Take test drive and check VAG 1551/1552 Scan Tool display for knock control specified values using a second technician.
NOTE: Perform knock sensor checks during a test drive since knock sensor diagnosis is active at an engine speed greater than 2600 RPM and an engine load greater than 3 ms.
- Observe appropriate safety precautions during test drive.
- Check DTC memory.
If malfunction still present:
- Replace knock sensors.
- Display Readiness. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Displaying Readiness Code", Testing and Inspection
If DTC memory has been erased or ECM was disconnected from Battery + :
- Set Readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Setting Readiness Code", Testing and Inspection