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Home >> Volvo >> 2001 >> C70 Convertible L5-2.4L Turbo VIN 56 B5244T >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Checking Control Module Power Supply And Ground Terminals

Checking Control Module Power Supply And Ground Terminals






Checking control module power supply and ground terminals

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

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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

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

Continue - FAULT FOUND

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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

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FAULT FOUND - Checking 15-supply to control module

FAULT-TRACING FAILED - Checking 15-supply to control module

No Fault Found - Checking 15-supply to control module

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Checking 15-supply to control module








- Ignition off.
- Control module disconnected.
- Ignition on.
Connect a voltmeter between #4 and #8 on the breakout box.









The voltmeter should read approximately battery voltage.

OK - Checking 30-supply (valves) to control module

Not OK - Checking fuse 11/25

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Checking fuse 11/25
Check that fuse 11/25 is intact.





Is fuse 11/25 intact?

Yes - Checking the voltage before the fuse

No - Checking for a short-circuit and replacing component

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Checking for a short-circuit and replacing component
Check cable between control module #4 and fuse 11/25 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Then replace fuse.





Select Continue when the fault has been remedied.

Continue - Verification

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Checking the voltage before the fuse




- Ignition on.
Connect a voltmeter between the rear socket (windshield side) on the fuse holder for fuse 11/25 and ground.





The voltmeter should read approximately battery voltage.

OK - Checking for an open-circuit in the cable

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

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Checking for an open-circuit in the cable
Check cable between control module #4 and fuse 11/25 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 remedied.

Continue - Verification

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Checking for an open-circuit in the cable
Check cable between ignition switch terminal 15I and fuse 11/25 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 remedied.

Continue - Verification

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Checking 30-supply (valves) to control module




- Ignition off.
Connect a voltmeter between #9 and #8 on the breakout box.









The voltmeter should read approximately battery voltage.

OK - No Fault Found

Not OK - Checking fuse

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Checking fuse
Check that fuse 11/14 is intact.





Is the fuse intact?

Yes - Checking the voltage before the fuse

No - Checking for a short-circuit and replacing component

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Checking for a short-circuit and replacing component
Check cable between control module #25 and fuse 11/4 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Then replace fuse.





Select Continue when the fault has been remedied.

Continue - Verification

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Checking the voltage before the fuse




- Ignition on.
Connect a voltmeter between the rear socket (windshield side) on the fuse holder for fuse 11/4 and ground.





The voltmeter should read approximately battery voltage.

OK - Checking for an open-circuit in the cable

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

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Checking for an open-circuit in the cable
Check cable between control module #25 and fuse 11/4 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 remedied.

Continue - Verification

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Checking for an open-circuit in the cable
Check the cable between battery positive terminal and fuse 11/4 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 remedied.

Continue - Verification

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Verification




Verification

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




- Ignition off.
- Reconnect connectors, reinstall components.
- Ignition on.
When the ignition is switched on the control module lights the ABS warning lamp. Check that the warning lamp goes out after approximately 2 seconds.

Note! The warning lamp will not go out if a fault has been stored in the control module.





Does the ABS warning lamp light and go out shortly afterwards?

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 be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.

Do you want to terminate fault-tracing at this time?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking ground terminals

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