ABS-141

Fault in circuit. Permanent fault

Connecting breakout box and checking ground terminals
Connecting the breakout box
Then continue with:

FAULT FOUND - Checking for resistance in the EBD pressure switch circuit

FAULT-TRACING FAILED - Checking for resistance in the EBD pressure switch circuit

No Fault Found - Checking for resistance in the EBD pressure switch circuit

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Checking for resistance in the EBD pressure switch circuit








- Ignition off.
- Control module disconnected.
- Connect an ohmmeter between #5 and #7 on the breakout box.
- Start the engine to pump up a vacuum in the power brake booster.
- Switch off the engine.
- Push brake pedal down hard.
Read off the ohmmeter.









With the brake pedal up the reading should be approximately 0 ohms. With the brake pedal fully depressed the ohmmeter should read infinite resistance.

OK - Checking EBD pressure switch circuit

Not OK - Checking resistance in the EBD pressure switch

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Checking resistance in the EBD pressure switch








- Ignition off.
- Disconnect EBD pressure switch.
- Connect an ohmmeter between EBD-pressure switch connector terminals 1 and 2.
- Start the engine to pump up a vacuum in the power brake booster.
- Switch off the engine.
- Push brake pedal down hard.
Read off the ohmmeter.









With the brake pedal up the reading should be approximately 0 ohms. With the brake pedal fully depressed the ohmmeter should read infinite resistance.

OK - Checking resistance in signal cable (+)

Not OK - Replacing component

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Replacing component
Try a new EBD pressure switch.

Select "Continue" when the component has been replaced.

Continue - Verification

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Checking resistance in signal cable (+)












- Ignition off.
- EBD pressure switch disconnected.
- Control module disconnected.
Connect an ohmmeter between EBD pressure switch connector terminal 1 and #5 on the breakout box.









The ohmmeter should read approximately 0 ohms.

OK - Checking resistance in signal 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 EBD pressure switch connector terminal 1 and control module #5 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

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Checking resistance in signal cable (-)












- Ignition off.
- EBD pressure switch disconnected.
- Control module disconnected.
Connect an ohmmeter between EBD pressure switch connector terminal 2 and #7 on the breakout box.









The ohmmeter should read approximately 0 ohms.

OK - Checking signal cable (+) resistance to signal 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 EBD pressure switch connector terminal 2 and control module #7 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

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Checking signal cable (+) resistance to signal cable (-)












- Ignition off.
- EBD pressure switch disconnected.
- Control module disconnected.
Connect an ohmmeter between #7 and #5 on the breakout box.









The ohmmeter should read infinite resistance.

OK - Checking for contact resistance and oxidation

Not OK - Checking for a short-circuit

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Checking for contact resistance and oxidation
The cause of the diagnostic trouble code (DTC) has been loose connections in the EBD pressure switch connector.
Check the EBD pressure switch connector 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 repaired.

Continue - Verification

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Checking for a short-circuit
Check cable between EBD pressure switch connector terminal:
- 1 and control module #5
- 2 and control module #7
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

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Checking EBD pressure switch circuit








- Ignition off.
- Connect control module.
- Ignition on.
- Brake pedal up.
Connect a voltmeter between #5 and #8 on the breakout box.









The voltmeter should read 5-6 V.

OK - Checking for contact resistance and oxidation

Low - Checking for a short-circuit

High - Checking for a short-circuit

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Checking for contact resistance and oxidation
The cause of the diagnostic trouble code (DTC) has been loose connections in the control module connector.
Check control module connector 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 repaired.

Continue - Verification

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Checking for a short-circuit
Check cable between EBD pressure switch connector terminal:
- 1 and control module #5
- 2 and control module #7
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

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Checking for a short-circuit
Check cable between EBD pressure switch connector terminal:
- 1 and control module #5
- 2 and control module #7
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 - Verification

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Verification

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




- Start the engine to pump up a vacuum in the power brake booster.
- Switch off the engine.
- Ignition on.
- Push brake pedal down hard.
Read off EBD pressure switch position.









With the brake pedal up this value should be OFF. With the brake pedal fully depressed this value should be ON.

OK - FAULT FOUND

Not OK - Fault-tracing information

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Fault-tracing information
Information
Attempt New Test - Connecting breakout box and checking ground terminals

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