Camshaft Adjustment Actuators, Exhaust, Checking

The following procedure is used to diagnose Cam Adjustment Actuators -F370, F371, F372, F373- which are controlled by Engine Control Module - J623-.

Special tools and workshop equipment required 

• multimeter.
• Wiring diagram.

Test requirements 

• The Engine Control Module - 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 appropriate Cam Adjustment Actuators -F370, F371, F372, F373- electrical harness connectors -item 26-.

Checking internal resistance 

-- Using a multimeter, check the Cam Adjustment Actuators -F370, F371, F372, F373- terminals 1 to 2 for resistance.

Specified value: 5.0 to 10.0 Ω (at approx. 20° C)

If the specified value was not obtained:

-- Replace the appropriate Cam Adjustment Actuators -F370, F371, F372, F373-. Refer to appropriate service information.

If the specified value was 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 Engine Control Module -J623-. Refer to appropriate service information.

-- Using a multimeter, Check the Cam Adjustment Actuators -F370, F371, F372, F373- electrical harness connector to the Engine Control Module - J623- electrical harness connector for resistance.

Cam Adjustment Actuators -F370, F371, F372, F373- electrical harness connector terminals	Engine Control Module - J623- electrical harness connector T60 terminals or test box sockets
F370 1	T 60- 18
F370 2	Fuse SB7
F371 1	T 60- 3
F371 2	Fuse SB7
F372 1	T 60- 19
F372 2	Fuse SB7
F373 1	T 60- 4
F373 2	Fuse SB7

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.

If no malfunction is found in the wiring and the resistance was OK:

-- Replace the Engine Control Module -J623-. Refer to appropriate service information.

Assembly is performed in the reverse order of the removal, Note The Following  :

Final procedures 

After 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 .