ABS 5.4

Solenoids. Open Circuit.

Fault symptoms
ABS warning light on. ABS not functioning.

Conditions
- If there is no current to three or more of the valves.
- If the control module's internal voltage relay is defective.
- No +30 power supply to the control module (pins 17 & 18).

Diagnostic help
The solenoid valves can be activated using the diagnostic tool.

- Select: "Activate".
- Select: "Valves"

Select the valve from the submenu. The selected valve will be activated at a frequency of 1 Hz for about 30 s.

Diagnostic procedure
1. Checking the power supply





Unplug the connector
^ Control module, ABS (547)

Go To Step 2

2. Checking the power supply

Part 1 Of 2:

Part 2 Of 2:

Take a voltage reading.
Between Pin 17 of connector and B+ (batt. positive)

The reading should be 0 V - 0.5 V

Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO
Go To Step 3

YES
Go To Step 4

3. Rectifying The Lead





Repair or replace the lead between fuse 1 in the engine bay's electrical distribution box and pin 17 of the control module.

When repair is complete
Go To Step 6

4. Checking the power supply

Part 1 Of 2:

Part 2 Of 2:

Take a voltage reading.
Between Pin 18 of connector and B+ (batt. positive)

The reading should be 0 V - 0.5 V

Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO
Go To Step 5

YES
Go To Step 6

5. Rectifying The Lead





Repair or replace the lead between fuse 1 in the engine bay's electrical distribution box and pin 18 of the control module.

When repair is complete
Go To Step 6

6. Final Check





^ Clear the diagnostic trouble codes in all systems.





Carry out a drive cycle
^ Drive the car at varying engine loads and engine rpm for five minutes.

Evaluate the drive cycle:





^ Check that the diagnostic trouble code has not recurred

Is the function correct?

NO
Go To Step 8

YES
Go To Step 7

7. Final Check
The steps taken to correct the fault were correct.
^ Diagnosis is complete.

8. Final Check
See Before changing a control module, refer to General Fault Diagnosis.
^ Diagnosis for this fault code is complete.