Knock Sensor 1 G61, Checking
Special tools and workshop equipment required
- Multimeter.
- Wiring diagram.
Test requirements
- The mounting bolt of Knock Sensor (KS) 1 -G61- tightened to 20 Nm.
- The Engine Control Module (ECM) - J623- fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.
Test procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .
Start diagnosis
-- Disconnect the Knock Sensor (KS) 1 -G61- electrical harness connector.
Checking internal resistance
-- Using aMultimeter, check the Knock Sensor (KS) 1 -G61- terminals 1 to 2 for an internal short.
Specified value: ∞ (Infinity).
If the specified value was not obtained:
-- Replace Knock Sensor (KS) 1 -G61-.
If the specified value was obtained:
Checking wiring
If the specified value was not obtained:
If the manufacturers test box is being used. Perform the following step.
-- Install the test box.
If the manufacturers test box is not being used. Perform the following step.
-- Remove the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE J623, REPLACING .
-- Using a Multimeter, Check the Knock Sensor (KS) 1 -G61- electrical harness connector to the Engine Control Module (ECM)J623 electrical harness connector T121 for resistance.
| Knock Sensor (KS) 1 -G61- electrical harness connector terminals | Engine Control Module (ECM) electrical harness connector T121 terminals or test box sockets |
|---|---|
| 1 | 106 |
| 2 | 99 |
| 3 | 108 |
Specified value: 1.5 Ω Max.
If the specified value was not obtained:
-- Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
-- Check the wiring connection for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
-- Perform a road test to verify repair.
If the DTC does not return:
Repair complete, Generate readiness code. Refer to READINESS CODE DESCRIPTION .
-- End diagnosis.
If the DTC returns and no malfunction is found in the wiring and the voltage supply was OK:
-- Replace the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE J623, REPLACING .
-- Assembly is performed in the reverse of the removal.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .
End of diagnosis