Low
Low
Checking the diagnostic trouble codes (DTCs)
Hint: The fault code has been stored because the engine control module (ECM) has registered that catalytic converter heating has not been completed satisfactorily.
This fault code is probably the result of other detected faults. These diagnostic trouble codes (DTCs) must be fault-traced and any faults remedied first.
- Ignition on.
- Click on the VCT2000 symbol to read off the diagnostic trouble codes (DTCs).
Check whether any fault codes for the throttle module or mass air flow sensor have been stored in the engine control module (ECM).
Are other diagnostic trouble codes (DTCs) stored in the engine control module (ECM)?
Yes - ANOTHER TEST
No - Checking the throttle unit
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Checking the throttle unit
Note! Dirt, ice build-up or objects can cause the throttle disc to jam momentarily. This may cause the diagnostic trouble code (DTC) to be stored.
Check that the throttle module throttle is not dirty, blocked or sticking. Clean as necessary.
Hint: A film of oil covering the throttle may mean that the flame trap is not functioning correctly.
Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation.
Other information
- Connecting the breakout box Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification Signal Specification, Engine Control Module (ECM)
- Throttle body, cleaning Procedures
- Throttle body Removal and Replacement
- Checking wiring and terminals Checking Wiring and Terminals
Was a fault detected?
Yes - Verification
No - Checking intake system and mass air flow sensor
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Checking intake system and mass air flow sensor
Check the intake system for blockages.
Check the connector and terminals for the mass air flow (MAF) sensor. Check for contact resistance. Check for oxidation.
Other information
- Connecting the breakout box Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification Signal Specification, Engine Control Module (ECM)
- Mass air flow (MAF) sensor Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
Was a fault detected?
Yes - Verification
No - Information
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Activate reading off the position of the throttle.
Check that both sensors indicate values within the permitted range at different deployments.
Are these values within their permitted ranges?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Information
VERIFIED - DONE
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off the signal from the mass air flow (MAF) sensor.
Check that the signal is between 0.5 - 4.5 V.
Is the signal within its permitted range?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFICATION FAILED - Information
VERIFIED - DONE
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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 the diagnostic trouble codes (DTCs)
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