Slow Regulation/Faulty Signal
Slow regulation/Faulty signal
Checking the status
- Start the engine.
Read off the camshaft shift angle and the camshaft shift angle, desired value.
At idle and at 4000 rpm, check that the camshaft's shift angle (desired value) corresponds with the camshaft's shift angle by an accuracy of ±3 degrees. The difference between the values can be read off in the lower display.
Carry out the check at stable engine speed (RPM).
Note! Before the engine speed (RPM) stabilizes, the difference between the values can be greater than ±3 degrees for approximately 1 second, this is normal.
If the values correspond by an accuracy of ±3 degrees, this means that the fault is intermittent. If the values deviate more than ±3 degrees, this means that the fault is permanent.
Do the values match?
Yes - Intermittent fault
No - Checking the components and wiring
-------------------------------------------------
Checking the components and wiring
Check the resistance on camshaft reset valve between terminals #1 and #2. Resistance must be approximately 3.7 ohms.
Check the signal cable between Engine control module (ECM) terminal #A13 and camshaft reset valve terminal #2. Check for an open-circuit, short-circuit to ground and short-circuit to voltage.
Check the power supply cable between system relay terminal #5 and camshaft reset valve terminal #1. Check for an open-circuit.
Remedy as necessary.
Other information:
- Checking wiring and terminals Checking Wiring and Terminals
- Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box
- Signal specification Signal Specifications
Was a fault detected?
Yes - Verification
No - Checking components
-------------------------------------------------
Checking components
- Check the engine oil level and quality. Check for contaminants in particular.
- Check the engine oil pressure.
- Remove the camshaft reset valve. Check the oil ducts in the cylinder head for the camshaft's reset valve. Check for blockage and contamination.
Note! If it is suspected that there are any contaminants in the camshaft reset valve it should be replaced.
Try with a new camshaft reset valve if no fault is found in the above troubleshooting.
Hint: If the fault persists after carrying out the above checks or corrective action, this can mean a damaged VVT unit.
Remedy as necessary.
Other information:
- Checking oil pressure, B5234T9, B5244T7 Checking Oil Pressure
- To access/replace the camshaft reset valve, see: Variable valve timing solenoid, replacing, B5234T9, B5244T7 Variable Valve Timing Solenoid, Replacing Variable valve timing solenoid, replacing Removal and Replacement
- Replacing the camshaft seals / variable valve timing (VVT) unit Camshaft Seal/Variable Valve Timing (VVT) Unit, Replacing
- Variable valve timing control Variable Valve Timing Control
Continue - Verification
-------------------------------------------------
Intermittent fault
Check the resistance on camshaft reset valve between terminals #1 and #2. Resistance must be approximately 3.7 ohms.
Check the signal cable between Engine control module (ECM) terminal #A13 and camshaft reset valve terminal #2. Check for an open-circuit, short-circuit to ground and short-circuit to voltage.
Check the power supply cable between system relay terminal #5 and camshaft reset valve terminal #1. Check for an open-circuit.
Check the engine oil level and quality. Check for contaminants in particular.
Check the engine oil pressure.
Remove the camshaft reset valve. Check the oil ducts in the cylinder head for the camshaft's reset valve. Check for blockage and contamination.
Note! If it is suspected that there are any contaminants in the camshaft reset valve it should be replaced.
Hint: The diagnostic trouble code (DTC) can also be caused by a damaged variable valve timing (VVT) unit.
Remedy as necessary.
Other information:
- Checking wiring and terminals Checking Wiring and Terminals
- Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box
- Signal specification Signal Specifications
- Checking oil pressure, B5234T9, B5244T7 Checking Oil Pressure
- To access/replace the camshaft reset valve, see: Variable valve timing solenoid, replacing Removal and Replacement Variable valve timing solenoid, replacing, B5234T9, B5244T7 Variable Valve Timing Solenoid, Replacing
- Replacing the camshaft seals / variable valve timing (VVT) unit Camshaft Seal/Variable Valve Timing (VVT) Unit, Replacing
- Variable valve timing control Variable Valve Timing Control
Continue - Verification
-------------------------------------------------
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Start the engine.
Read off the camshaft shift angle and the camshaft shift angle, desired value.
Check at idle speed and at approximately 4000 rpm that the camshaft shift angle, desired value, corresponds to the camshaft shift angle to an accuracy of ±3°. The difference between the values can be read off in the lower display.
Carry out the check at stable engine speed (RPM).
Note! Before the engine speed stabilizes, the difference between the values may be ±3° over approximately 1 second. This is normal.
If the values correspond with an accuracy of ±3°, it indicates that the fault is intermittent. If the values deviate by more than ±3° it indicates that the fault is permanent.
Is the function OK?
Yes - VERIFIED
No - VERIFICATION FAILED
------------------------
VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
-------------------------------------------------
Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
------------------------
Attempt New Test - Checking the status
-------------------------------------------------