Faulty Signal. Permanent Fault

Faulty signal. Permanent fault

Checking ABS diagnostic trouble codes (DTCs)
Read off the diagnostic trouble codes (DTCs) in the ABS control module for a missing signal from the left front wheel.





Was a diagnostic trouble code (DTC) found?

Yes - ABS diagnostic trouble codes (DTCs)

No - Checking vehicle speed signal

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ABS diagnostic trouble codes (DTCs)
Remedy the fault according to Section 5 Brakes S40/V40.

The parameter should display battery voltage.

Continue - Verification

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Checking vehicle speed signal




- Ignition on.
Raise the front wheels and check the vehicle speed signal at the engine control module (ECM) terminal #52.

Other information
- To connect the breakout box, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000.





The value should oscillate between approximately 0 volts and just on battery voltage when the left front wheel is spun.

OK - Checking terminals

Not OK - Checking wiring and terminals

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Checking terminals
Check the ABS control module and engine control module (ECM) connectors for contact resistance and oxidation Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.





Select Continue.

Continue - Verification

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Checking wiring and terminals
Check the cable between engine control module (ECM) terminal 52 and ABS control module terminal #25 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault. Check for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Remedy as necessary.









Select Continue.

Continue - Verification

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Verification

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

- Raise the car so that the drive wheels are clear of the ground. Ensure that the car is secure.
- Start the engine and let it idle.
- Activate reading off the vehicle speed: Click on the VCT 2000 symbol.
- Shift gear selector to position D so that the drive wheels begin to rotate
Depress the accelerator pedal (AP) and check that the speed is updated.

Note! Ensure that the wheels are not rotating when the gear selector is moved.

Note! Diagnostic trouble codes (DTCs) may be stored in the ABS system when the rear wheels are stationary and the front wheels rotate.





Was the signal updated?

Yes - FAULT FOUND

No - No Fault FoundFault-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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking ABS diagnostic trouble codes (DTCs)

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