Operation CHARM: Car repair manuals for everyone.
Home >> Volvo >> 1998 >> C70 Convertible L5-2.4L Turbo VIN 56 B5254T >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> ABS Codes (Antilock Brake System Control Module) >> ABS-143 >> Vehicle Speed Signal. Fault In Circuit >> Fault In Circuit

Fault In Circuit






Fault in circuit

Other diagnostic trouble codes (DTCs)
- Read off other diagnostic trouble codes (DTCs).

Hint: To guarantee the correct diagnostic trouble code (DTC) status, if any of the following DTCs are stored, the DTC status must be established by a status check.





Are diagnostic trouble codes (DTCs) ABS-141, ABS-142, ABS-144 or ABS-423 stored?

Yes - Status check

No - Fault in circuit. Permanent fault Fault In Circuit. Permanent Fault

-------------------------------------------------

Status check
- Test drive the car.
- Disconnect the Volvo Scan Tool (ST) to interrupt diagnostics.

Warning! The ABS and EBD functions are not available when the Volvo on-board diagnostic (OBD) system is activated. Take care when test driving the car as the wheels may lock when braking.

Check that speedometer is operating correctly.





Is the speedometer working?

OK - INT

Not OK - PER

-------------------------------------------------

PER





Fault in circuit. Permanent fault

Connecting breakout box and checking ground terminals





Connecting the breakout box

Connecting the breakout box




- Ignition off.
- Disconnect the ABS control module by pressing in the catch on the rear edge of the cover (wheel arch side). Carefully turn the cover upwards so that the locking catches release.
- Check control module and control module connector to ensure that: Male and female terminals are undamaged and properly attached (cannot be pressed in). Female terminal cables are correctly connected to the terminals.
- Pay particular attention to the terminals related to the diagnostic trouble code (DTC)/symptom.
- Connect adapter 951 1354 Adapter 25-pin ABS 850 951 1354 Adapter 25-Pin ABS 850 to the control module connector (wiring side) and connect breakout box 951 1428 Breakout box 951 1428 Breakout Box to the adapter.
- Control module disconnected.
- Then check ground terminals.





Continue - Checking ground terminals

------------------------

Checking ground terminals








- Ignition off.
- Switch off all equipment that takes power from the battery (courtesy lighting, radio etc).




- Connect an ohmmeter between battery negative terminal and #8 and #24 on the breakout box.

The ohmmeter should read approximately 0 ohms for all readings.

OK - Return to the fault-tracing procedure where it was interrupted.
Reading is OK

Not OK - Check ground terminal 1/1 (battery negative terminal) and cable between ground terminal and control module #8 and #24, for an open-circuit and contact resistance.-Return to the fault-tracing procedure where it was interrupted.
Value is not OK

------------------------

Reading is OK
- Return to the fault-tracing procedure where it was interrupted.

Continue - FAULT FOUND

------------------------

Value is not OK
- Check ground terminal 1/1 (battery negative terminal) and cable between ground terminal and control module #8 and #24, for an open-circuit and contact resistance.
- Return to the fault-tracing procedure where it was interrupted.

Continue - FAULT FOUND

------------------------

Then continue with:

FAULT FOUND - Checking signal cable resistance

FAULT-TRACING FAILED - Checking signal cable resistance

No Fault Found - Checking signal cable resistance

-------------------------------------------------

Checking signal cable resistance












- Ignition off.
- Control module disconnected.
- Expose combined instrument panel.
- Disconnect combined instrument panel connector A.
Connect an ohmmeter between #6 on the breakout box and combined instrument panel connector A terminal 3.









The ohmmeter should read approximately 0 ohms.

OK - Checking signal cable resistance to ground

Not OK - Checking for an open-circuit in the cable

-------------------------------------------------

Checking for an open-circuit in the cable
Check cable between combined instrument panel connector A terminal 3 and control module #6 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.









Select "Continue" when the fault has been repaired.

Continue - Verification

-------------------------------------------------

Checking signal cable resistance to ground












- Ignition off.
- Combined instrument panel connector A disconnected.
- Control module disconnected.
Connect an ohmmeter between #6 and #8 on the breakout box.









The ohmmeter should read infinite resistance.

OK - Checking short-circuit to supply voltage in signal cable

Not OK - Checking for a short-circuit

-------------------------------------------------

Checking for a short-circuit
Check cable between combined instrument panel connector A terminal 3 and control module #6 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.









Select "Continue" when the fault has been repaired.

Continue - Verification

-------------------------------------------------

Checking short-circuit to supply voltage in signal cable












- Ignition off.
- Combined instrument panel connector A disconnected.
- Control module disconnected.
- Ignition on.
Connect a voltmeter between #6 and #8 on the breakout box.









The voltmeter should read approximately 0 V.

OK - Checking the combined instrument panel

Not OK - Checking for a short-circuit

-------------------------------------------------

Checking for a short-circuit
Check cable between combined instrument panel connector A terminal 3 and control module #6 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.









Select "Continue" when the fault has been repaired.

Continue - Checking the combined instrument panel

-------------------------------------------------

Checking the combined instrument panel








- Ignition off.
- Connect control module.
- Connect combined instrument panel.
- Raise car so that front wheels are free of the ground.
- Remove front wheels during the test.
- Engine idling.
- Select a gear so the front wheels start to rotate.

Note! When the rear wheels are stationary and the front wheels rotate, diagnostic trouble codes (DTCs) may be stored in the ABS system. Erase any diagnostic trouble codes (DTCs) stored in the ABS system after fault-tracing.

Check that speedometer is operating correctly.

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





Is the speedometer working?

Yes - Fault cause and checking for contact resistance and oxidation

No - Replacing component

-------------------------------------------------

Fault cause and checking for contact resistance and oxidation
The cause of the diagnostic trouble code (DTC) has been loose connections in control module and combined instrument panel connectors.
Check connectors for contact resistance and oxidation and remedy in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.





Select "Continue" when the fault has been repaired.

Continue - FAULT FOUND

-------------------------------------------------

Replacing component
Try a new combined instrument panel.

Select "Continue" when the component has been replaced.

Continue - Verification

-------------------------------------------------

Checking the combined instrument panel

Hint: The combined instrument panel may have been damaged if there has been a short-circuit to supply voltage in its signal cable.








- Ignition off.
- Connect control module.
- Connect combined instrument panel.
- Raise car so that front wheels are free of the ground.
- Remove front wheels during the test.
- Engine idling.
- Select a gear so the front wheels start to rotate.

Note! When the rear wheels are stationary and the front wheels rotate, diagnostic trouble codes (DTCs) may be stored in the ABS system. Erase any diagnostic trouble codes (DTCs) stored in the ABS system after fault-tracing.

Check that speedometer is operating correctly.

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





Is the speedometer working?

Yes - Speedometer working

No - Replacing component

-------------------------------------------------

Speedometer working
Combined instrument panel is OK

Select "Continue"

Continue - FAULT FOUND

-------------------------------------------------

Verification

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

Hint: An alternative to the following method is to test drive the car.












- Ignition off.
- Reconnect connectors, reinstall components.
- Raise car so that front wheels are free of the ground.
- Remove front wheels during the test.
- Engine idling.
- Select a gear so the front wheels start to rotate.

Note! When the rear wheels are stationary and the front wheels rotate, diagnostic trouble codes (DTCs) may be stored in the ABS system. Erase any diagnostic trouble codes (DTCs) stored in the ABS system after fault-tracing.

Check that speedometer is operating correctly.

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





Is the speedometer working?

Yes - FAULT FOUND

No - Fault-tracing information

-------------------------------------------------

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

------------------------

Attempt New Test - Connecting breakout box and checking ground terminals

-------------------------------------------------

No Fault Found - No Fault Found

-------------------------------------------------

INT





Fault in circuit. Intermittent fault

Checking cables and terminals
Check combined instrument panel and control module connectors for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Check cable between combined instrument panel connector A terminal 3 and control module #6 for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults , and an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.





Select "Continue" when the fault has been repaired.

Continue - Fault-tracing information

------------------------

Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

------------------------

Attempt New Test - Checking cables and terminals

-------------------------------------------------

No Fault Found - No Fault Found

-------------------------------------------------

pro multis · About Operation CHARM