Faulty Signal
Faulty signal
Fault-tracing information
Fault-tracing information
Fault-tracing information
Caution! The male and female pins on the electronic throttle unit connectors are gold plated. Great care must be taken when measuring. Damage to the gold plating can result in operating difficulties.
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Continue - Checking the diagnostic trouble codes (DTCs)
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Checking the diagnostic trouble codes (DTCs)
- Ignition on
- Read off diagnostic trouble codes (DTCs).
Check if any diagnostic trouble codes (DTCs) are stored for the electronic throttle unit or the throttle position (TP) sensor.
If any of these diagnostic trouble codes (DTCs) are stored, these must be remedied first.
Are any of the above diagnostic trouble codes (DTCs) stored?
Yes - Fault-tracing information
No - Checking components and wiring
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Fault-tracing information
Remedy any diagnostic trouble codes (DTCs) that are stored.
Remedy as necessary.
Continue - DONE
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Checking components and wiring
- Ignition off
- Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation.
Check the resistance value of the damper motor winding in the throttle unit. Take readings between throttle unit terminals #1 and #4 (component side). Check for an open-circuit. Check for a short-circuit.
Note! The resistance of the motor winding in the damper motor is very low.
Replace the throttle unit if necessary.
Check the damper motor (+) and (-) cables. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Check between:
- Engine control module (ECM) terminal #A74 (#B14) and throttle unit terminal #4
- Engine control module (ECM) terminal #A75 (#B15) and throttle unit terminal #1.
Also check the damper motor cables (+) and (-). Check for a short-circuit to each other.
If no faults are found during the checks and the diagnostic trouble code (DTC) recurs, try replacing the throttle unit.
Note! When replacing the throttle unit or the engine control module (ECM), adaptation of the throttle unit must be carried out. See VIDA vehicle communication (Adaptation of the throttle unit).
Remedy as necessary.
Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- Component specifications, B5254T7 [1][2]Engine Control Module
- Throttle body, B5254T7 Removal and Replacement
- Engine control module (ECM), B5254T7 Service and Repair
- 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
- Reinstall the connectors, components etc.
- Start the engine.
Read off diagnostic trouble codes (DTCs).
If the status of the diagnostic trouble code (DTC) is intermittent the fault has been remedied.
Is the status of the diagnostic trouble code (DTC) intermittent?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - 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 - Fault-tracing information
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