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 .

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.

-- 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

-- Remove the Motronic Engine Control Module (ECM) -J623-.

-- 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. Refer to Appropriate Wiring Diagrams for Pin locations.

Camshaft Position (CMP) Sensor -G40- electrical harness connector terminals	Motronic Engine Control Module (ECM) electrical harness connector T60 terminals
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-.

If no malfunction is found in the wiring and voltage supply was Not OK:

-- Replace the Motronic Engine Control Module (ECM) -J623-.

-- Install the engine cover with air filter.

Final Procedures 

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .