Extrapolation Counter. Permanent Fault
Extrapolation counter. 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
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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 resistance in wheel sensor circuit
No Fault Found - Checking resistance in wheel sensor circuit
FAULT-TRACING FAILED - Checking resistance in wheel sensor circuit
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Checking resistance in wheel sensor circuit
- Ignition off.
- Control module disconnected.
Connect an ohmmeter between breakout box:
- #2 and #10 (diagnostic trouble code (DTC) ABS-323).
- #1 and #17 (diagnostic trouble code (DTC) ABS-324).
The ohmmeter should read 1040-1160 ohms.
OK - Checking signal cables
Not OK - Checking resistance in wheel sensor
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Checking resistance in wheel sensor
- Ignition off.
- Disconnect wheel sensor.
Connect an ohmmeter between wheel sensor connector 24/19 terminal:
- #1 and #3 (diagnostic trouble code (DTC) ABS-323).
- #2 and #4 (diagnostic trouble code (DTC) ABS-324).
The ohmmeter should read 1040-1160 ohms.
OK - Checking for contact resistance and oxidation
Not OK - Checking for an open-circuit, short-circuit and replacing component
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Checking for contact resistance and oxidation
- The diagnostic trouble code (DTC) has been caused by loose connections in the wheel sensor connector.
Check wheel sensor connectors 24/19, 24/4B and 24/2B for contact resistance and oxidation and remedy 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, short-circuit and replacing component
Check cables between wheel sensor and connector 24/19 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and a short-circuit to each other.
If the cables are OK: Try a new wheel sensor according to Rear wheel sensor, with integrated cabling, replacement Rear Wheel Sensor, With Integrated Cabling, Replacement.
Select Continue when the fault has been remedied.
Continue - Verification
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Checking signal cables
- Ignition off.
- Connect control module.
- Ignition on.
Connect a voltmeter between breakout box:
- #8 and #10 (diagnostic trouble code (DTC) ABS-323).
- #8 and #17 (diagnostic trouble code (DTC) ABS-324).
The voltmeter should read approximately 2.3 V.
OK - Checking wheel bearings
High - Checking for a short-circuit
Low - Checking for a short-circuit
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Checking for a short-circuit
Check wheel sensor for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check cable between connector 24/19 terminal:
- 1 and control module #2 (diagnostic trouble code (DTC) ABS-323)
- 3 and control module #10 (diagnostic trouble code (DTC) ABS-323)
- 2 and control module #1 (diagnostic trouble code (DTC) ABS-324)
- 4 and control module #17 (diagnostic trouble code (DTC) ABS-324)
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 remedied.
Continue - Verification
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Checking for a short-circuit
Check cable between connector 24/19 terminal:
- 1 and control module #2 (diagnostic trouble code (DTC) ABS-323)
- 3 and control module #10 (diagnostic trouble code (DTC) ABS-323)
- 2 and control module #1 (diagnostic trouble code (DTC) ABS-324)
- 4 and control module #17 (diagnostic trouble code (DTC) ABS-324)
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 remedied.
Continue - Verification
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Checking wheel bearings
Check wheel bearing on relevant wheel for play and sticking.
Is the wheel bearing OK?
OK - Checking wheel sensor
Not OK - Action
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Action
Remedy as necessary.
Select Continue when the fault has been remedied.
Continue - Verification
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Checking wheel sensor
- Ignition off.
Note! Do not disconnect wheel sensor.
Check that wheel sensor is fitted tightly against shaft/hub. Check that there is no dirt between the sensor and mating surface.
- Remove wheel sensor according to Rear wheel sensor, with integrated cabling, replacement Rear Wheel Sensor, With Integrated Cabling, Replacement. Check that the tip of the wheel sensor is intact.
Is the wheel sensor OK?
OK - Checking pulse wheel
Not OK - Remedying or replacing component
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Remedying or replacing component
Reinstall loose wheel sensors according to Rear wheel sensor, with integrated cabling, replacement Rear Wheel Sensor, With Integrated Cabling, Replacement.
Replace damaged wheel sensors according to Rear wheel sensor, with integrated cabling, replacement Rear Wheel Sensor, With Integrated Cabling, Replacement.
Select Continue when the fault has been remedied.
Continue - Verification
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Checking pulse wheel
- Remove wheel for the relevant pulse wheel.
Check that pulse wheel is mounted properly, is not damaged (all teeth present) or scratched etc.
Is the pulse wheel OK?
OK - Checking cables and terminals
Not OK - Replacing component
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Replacing component
Replace pulse wheel.
Select Continue when the fault has been remedied.
Continue - Verification
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Checking cables and terminals
Check control module connectors 24/19, 24/4B and 24/2B and wheel sensor connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check wiring between wheel sensor and control module:
- #2 and #10 (diagnostic trouble code (DTC) ABS-323).
- #1 and #17 (diagnostic trouble code (DTC) ABS-324).
for an intermittent short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault an intermittent short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault and an intermittent 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 - Checking for interference
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Checking for interference
Check that wheel sensor wiring is not too close to sources of interference such as electric motors, ignition cables, car-phone cables etc.
Select Continue when the fault has been remedied.
Continue - Verification
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Verification
Verification
Hint: After repair it is necessary to check that the fault has been rectified
- Ignition off
- Reconnect the connections, components etc.
- Disconnect Volvo System Tester so that the diagnosis is aborted.
Warning! The ABS and EBD systems are not available while Volvo Diagnostics is activated. Take great care when test driving as there is a serious risk of the wheels locking when braking.
- Test drive the vehicle as per Test driving Test Driving.
- Stop the vehicle.
Note the DTC status.
Is the fault 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 - Connecting breakout box and checking ground terminals
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