Test 07 - Control Unit, Rear Wheel Simulation

TEST SEQUENCE
1. Connections needed:
- T-plug (4a) with adapter (A) at Antilock Brake System (ABS) wire harness (1)
- T-plug (4b) and adapter (B) at ABS control unit (2)
- Connecting lead from adapter (A) and (B) to cigar lighter - red telltale lamp must come "On"
- Switch position at adapter (A) on '3' model and test step 07 (left), at adapter (B) on '3' model and 5 A - compare with nominal pressure drop values
2. Switch "On" ignition; note voltage between lines 1 and 10.
3. When pressure buildup values appear, press acknowledge key.
4. When pressure drop values appear, press acknowledge key. Compare with nominal values.
5. Repeat test step with switch position 2 A (adapter "B") and compare with nominal pressure retention values.





Nominal Values

6. Compare the displayed actual values obtained from the test equipment with the nominal values provided above. If nominal values are not obtained, proceed with the troubleshooting procedures below as needed.

TROUBLESHOOTING
Voltage Between Wires 1 And 10
- Turn on ignition.
- Run engine.

Battery charged (check).

Solenoid Valve
Pressure Buildup, Drop, Hold
- Due to high switching "On" power, possibly repeat test step with engine running.

Replace control unit and repeat test step.

- If in test steps 08, 09 and 10 valves do not "Switch" or pump does not "Run".

Replace hydraulic unit.

NOTE: It might be necessary to repeat this test step to reach the nominal values due to the high switching-on power and short switching phase.