Signal Too Low or Signal Missing

Signal too low or signal missing

Checking the status

Hint: The diagnostic trouble code (DTC) may be caused by a defective fuse. If the engine does not start, check the fuse for the power supply to the camshaft reset valve.




- Start the engine
- Read off the value for the camshaft shift angle and the desired value for the camshaft shift angle
- Active the quick test of camshaft control by clicking the start button
- Increase the engine speed (RPM) to approximately 2000 rpm and keep the engine running at this speed.
When the engine speed (RPM) increases, the control module will start the quick test to control the shift angle of the camshaft to the different target values. There is a fault if the control module does not operate the camshaft shift angle to the different target values.
During the quick test, check that the shift angle of the camshaft (actual value) corresponds to the target values to an accuracy of ±10°. If the shift angle of the camshaft (target value) does not change, or if the actual value does not correspond to the target value, the function is faulty.
Deviation between the values can be read off in the lower display.
Carry out the check for approximately 15 seconds at an engine speed (RPM) of 2000 rpm. The test is completed when the shift angle of the camshaft returns to 0°. To restart the test, let the engine return to idle speed, then increase the engine speed to approximately 2000 rpm.
The fault is intermittent if the function is OK.

Note! The test is active until the ignition is switched off. Switch off the ignition before the car is delivered to the customer.






Continue - Checking the wiring

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Checking the wiring
Check the fuse before the circuit. If the fuse is blown, check the circuit. Check for a short-circuit to ground.
Check the resistance of the camshaft reset valve between terminals #1 and #2.
The resistance must be approximately 3.7 ohms.
Check the signal cable between engine control module (ECM) terminal #A21 (#A21) and camshaft reset valve terminal #2. Check for an open-circuit. Check for a short-circuit to ground.
Check the power supply cable between system relay terminal #5 and camshaft reset valve terminal #1. Check for an open-circuit.

Hint: With the ignition on and the reset valve and camshaft connector disconnected, the voltage at connector terminal #1 must be approximately Ubat.

Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- To replace the camshaft reset valve, see Variable valve timing solenoid, replacing [1][2]Removal and Replacement
- For information about signals on 5 cylinder engines, see Signal specification Signal Description / Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Description / Specification
- Checking wiring and terminals Checking Wiring And Terminals.














Continue - Verification

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.




- Start the engine
- Read off the value for the camshaft shift angle and the desired value for the camshaft shift angle
- Active the quick test of camshaft control by clicking the start button
- Increase the engine speed (RPM) to approximately 2000 rpm and keep the engine running at this speed.
When the engine speed (RPM) increases, the control module will start the quick test to control the shift angle of the camshaft to the different target values. There is a fault if the control module does not operate the camshaft shift angle to the different target values.
During the quick test, check that the shift angle of the camshaft (actual value) corresponds to the target values to an accuracy of ±10°. If the shift angle of the camshaft (target value) does not change, or if the actual value does not correspond to the target value, the function is faulty.
Deviation between the values can be read off in the lower display.
Carry out the check for approximately 15 seconds at an engine speed (RPM) of 2000 rpm. The test is completed when the shift angle of the camshaft returns to 0°. To restart the test, let the engine return to idle speed, then increase the engine speed to approximately 2000 rpm.

Note! The test is active until the ignition is switched off. Switch off the ignition before the car is delivered to the customer.





Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

PAPER - No Fault Found

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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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the wiring

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