Fault-Tracing
Fault tracing
Checking the status
- Start the engine.
Read the diagnostic status and fault status for the diagnostic trouble code by selecting the diagnostic trouble code in the list.
Check whether the fault is permanent or intermittent by reading the fault status of the trouble code when the diagnostic status is "Completed".
If the fault status is "Fault found", the fault is permanent. If the fault status is "No fault found", the fault is intermittent and not currently active.
Note! The fault status cannot switch from "Fault found" to "No fault found" within the same operating cycle.
Continue - Checking components and wiring
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Checking components and wiring
Hint: Bank 1 (cylinder row nearest the front): cylinders 1, 3, 5 and 7. Bank 2 (cylinder row furthest to the rear, nearest the passenger compartment): cylinders 2, 4, 6, and 8.
- Ignition off
Check the fuse for the circuit. If the fuse is blown, check the cable for short-circuit to ground.
Check changeover valve resistance.
Disconnect the engine control module (ECM).
Check the signal cable of the relevant changeover valve camshaft for open-circuit.
Measure between:
- Control module #A87 (#B27) and reset valve camshaft #2, inlet (bank 1).
- Control module #A86 (#B26) and reset valve camshaft #2, inlet (bank 2).
Check the power cable of the relevant changeover valve camshaft for open-circuit.
Measure between:
- System relay and reset valve camshaft #1, inlet (bank 1).
- System relay and reset valve camshaft #1, inlet (bank 2).
Remedy as necessary.
Other information
- Connecting the breakout box, B8444S Connecting the Breakout Box
- Signal specification, engine control module (ECM), B8444S Signal Specification
- Variable valve timing solenoid, replacing Removal and Replacement
- Component specifications, B8444S [1][2]Computers and Control Systems
- Checking wiring and terminals Checking Wiring and Terminals
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reconnect the connectors, components, etc.
- Start the engine.
- Test drive the car on the road in different driving conditions with high and low loads so that the engine control module (ECM) can carry out diagnostics.
- Connect VCT2000 to the data link connectorwithout switching off the engine.
- Read the diagnostic status and fault status for the diagnostic trouble code by selecting the diagnostic trouble code in the list.
Note! If the engine is switched off, the stored fault status will be erased and the test drive will have to be repeated.
Check the fault status for the diagnostic trouble code when the scan is "Implemented". When the function is correct the fault status should be "No fault found" when the scan is implemented.
Is the function OK?
Yes - Troubleshooting procedure complete
No - Fault-tracing information
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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
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Attempt New Test - Checking components and wiring
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