Camshaft Position Sensor, Checking
Observe all safety precautions: SAFETY PRECAUTIONS
View clean working conditions: CLEAN WORKING CONDITIONS
Prior to repair work, perform a preliminary check to verify the condition. Refer to PRELIMINARY CHECK .
Use only gold-plated terminals when servicing terminals in harness connector of Camshaft Position (CMP) Sensor -G40-.
Special tools and workshop equipment required
- multimeter.
- Wiring diagram.
Test requirements
- The Motronic 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 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
-- Remove the engine cover. Refer to the Repair information.
-- Disconnect the Camshaft Position (CMP) Sensor -G40- electrical harness connector.
-- Switch the ignition on.
-- Using a multimeter, Check the Camshaft Position (CMP) Sensor -G40- electrical harness connector terminals 1 to 3 for voltage.
Specified value: near 5.0 V
-- Using a multimeter, Check the Camshaft Position (CMP) Sensor -G40- electrical harness connector terminals 2 to 3 for voltage.
Specified value: near 4.90 V
-- Switch the ignition off.
If any specified values were Not obtained:
Checking wiring
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 Motronic Engine Control Module (ECM) -J623-. Refer to the Repair information.
-- Using a multimeter, Check the Camshaft Position (CMP) Sensor -G40- electrical harness connector to the Motronic Engine Control Module (ECM) electrical harness connector T60 for an open circuit.
| Camshaft Position (CMP) Sensor -G40- electrical harness connector terminals | Motronic Engine Control Module (ECM) electrical harness connector T60 terminals or test box sockets |
|---|---|
| 1 | 10 |
| 2 | 44 |
| 3 | 51 |
Specified value: 1.5 Ω Max.
If any specified values were Not obtained:
-- Check the wiring connection for an open circuit, high resistance, short circuit to Battery (+) or Ground.
-- Check the wiring connection for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and voltage supply was OK:
-- Replace the Camshaft Position (CMP) Sensor -G40-. Refer to the Repair information.
If no malfunction is found in the wiring and voltage supply was Not OK:
-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to the Repair information.
-- Install the engine cover with air filter. Refer to the Repair information.
Final procedures
After the 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 .