Knock Sensor 4
The following procedure is used to diagnose Knock Sensor 4 G199 which is controlled by Engine Control Module (ECM) 2 J624.
Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.
Test requirements
- The mounting bolt of Knock Sensor 4 G199 tightened to 20 Nm.
- The Engine Control Module (ECM) 2 J624 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.
Procedure
- Remove the front engine cover - 1 -.
- Disconnect the blue Knock Sensor 4 G199 electrical harness connector - 7 -.
Checking internal resistance
- Using a Multimeter, check the Knock Sensor 4 G199 terminals 1 to 2 for an internal short.
Specified value: ∞ (Infinity).
If the specified value was not obtained:
- Replace Knock Sensor 4 G199. Refer to → .
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
- Install the test box. Refer to → .
If the manufacturers test box is not being used. Perform the following step.
- Remove the Engine Control Module (ECM) 2 J624. Refer to → .
- Using a Multimeter, check the Knock Sensor 4 G199 electrical harness connector to the Engine Control Module (ECM) 2 J624 electrical harness connector T60d for an open circuit.
| Knock Sensor 4 G199 electrical harness connector terminals | Engine Control Module (ECM) 2 J624 electrical harness connector T60d terminals or test box sockets |
|---|---|
| 1 | 9 |
| 2 | 24 |
| 3 | 52 (Shield) |
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, lose or broken terminals.
- If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and the resistance was not OK:
- Replace Knock Sensor 4 G199. Refer to → .
If no malfunction is found in the wiring and the resistance was OK:
- Replace the Engine Control Module (ECM) 2 J624. Refer to → .
- Assembly is performed in the reverse order of removal.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
- Check the 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.