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Home >> Volvo >> 2000 >> S40 L4-1.9L Turbo VIN 25 B4204T2 >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Testing Components And Functions >> Checking Power Supply

Checking Power Supply






Checking the power supply

Connecting the breakout box





Connecting the breakout box
951 1426 31-pin adapter 951 1426 31-Pin Adapter 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428
Connecting the breakout box to the ABS control module





Is the breakout box connected to the ABS control module?

Yes - FAULT FOUND

No - Connecting the breakout box

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Connecting the breakout box








- Ignition off.
- Disconnect the ABS control module.
- Check the control module and the control module connector to ensure that:
The male and female terminals are undamaged and properly attached (cannot be pressed in).
The wiring for the female terminals are securely connected.
Check in particular those terminals that are relevant to the stored diagnostic trouble code (DTC) / symptoms.
Connect adapter 951 1426 31-pin adapter 951 1426 31-Pin Adapter to the control module connector (wiring side). Connect breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to the adapter.

Note! ABS control module terminals 1-40 correspond to terminals 1-40 on the breakout box.





Select Continue.

Continue - Checking the ground terminal

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Checking the ground terminal




- Ignition off.
- Switch of all power consuming components, such as the passenger compartment lighting and the radio.
Connect an ohmmeter between terminal 16 on the breakout box and the battery negative terminal.









The ohmmeter should read approximately 0 ohms.

OK - No Fault FoundFault-tracing information

Not OK - Checking for an open-circuit and contact resistance

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Checking for an open-circuit and contact resistance
Check ground terminal 31/2. Check the cable between ground terminal 31/2 and control module terminal 16 for:
an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
contact resistance according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Check the ground lead between the battery and the bodywork for:
an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
contact resistance according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.













Select "Continue" when the fault has been remedied.

Continue - Verification
Verification

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Verification




Verification

Verification

Hint: Check after repair that the fault has been rectified.
Proceed as follows:




- Switch off the ignition.
- Switch off all power consuming components such as the courtesy lighting and the radio.








- Connect an ohmmeter between terminal 16 on the breakout box and the battery negative terminal.

The ohmmeter should read approximately 0ohms.

OK - VERIFIED

Not OK - 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 - FAULT-TRACING FAILED

No - Attempt New Test

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Attempt New Test - Connecting the breakout box

FAULT-TRACING FAILED - FAULT-TRACING FAILED

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FAULT FOUND - Checking the 15-supply to the control module

No Fault Found - Checking the 15-supply to the control module

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

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Checking the 15-supply to the control module








- Switch off the ignition.
- Control module disconnected.
- Ignition on.
Connect a voltmeter between terminals 13 and 16 on the breakout box.









The voltmeter should read approximately battery voltage.

OK - No Fault Found

Not OK - Checking fuse 23

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Checking fuse 23
Check that fuse 23 in the integrated relay / fusebox is intact.









Is the fuse intact?

Yes - Checking the voltage before the fuse 23

No - Checking for a short-circuit

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Checking for a short-circuit
Check the cable between fuse 23 in the integrated relay/fusebox and control module terminal 15 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Then replace the fuse.













Select Continue when the fault has been remedied.

Continue - Verification
Verification

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Checking the voltage before the fuse 23




- Ignition on.
Connect a voltmeter between the rear socket (windshield side) on the fuse holder for fuse 23 in the integrated relay/fusebox and ground.









The voltmeter should read battery voltage.

OK - Checking for an open-circuit

Not OK - Checking for an open-circuit

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Checking for an open-circuit
Check the cable between control module terminal 15 and fuse 23 in the integrated relay/fusebox 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
Verification

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Checking for an open-circuit
Check the circuit after fuse 23 in the integrated relay/fusebox for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
For information about the circuit after fuse 23, see Service Manual Section 3 (39) Wiring diagram.














Continue - Verification
Verification

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Verification




Verification

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












- Switch off the ignition.
- Disconnect the breakout box if this has not already been done.
- Reinstall the connectors, components etc.
- Switch on the ignition.
When the ignition is switched on, the control module lights the ABS warning lamp. The ABS warning lamp should go out again after approximately 4 seconds.

Hint: The lamp does not go out if the control module has detected a fault.





Is the function of the ABS warning lamp OK?

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
Attempt New Test - Connecting the breakout box

FAULT-TRACING FAILED - FAULT-TRACING FAILED

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