DIAGNOSIS
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-67
STEP 12. Voltage measurement at A-05 ASC-ECU
connector
(1) Disconnect the ASC-ECU connector, connect the ASC
check harness (Special tool: MB991997) to the
ASC-ECU-side connector and the wiring harness-side
connector, and then measure at the special tool connector
side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the wheel speed sensor
circuit power supply terminal (signal terminal) No. 43 and
the body ground.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 13.
NO : Go to Step 15.
STEP 13. Connector check: A-05 ASC-ECU connector,
C-47 intermediate connector, D-09 wheel speed sensor
<RR> connector
Q: Is the check result normal?
YES : Go to Step 14.
NO : Repair the defective connector. Then go to Step 16.
STEP 14. Wiring harness check between A-05 ASC-ECU
connector terminal No. 43 and D-09 wheel speed sensor
<RR> connector terminal No. 1, and between A-05
ASC-ECU connector terminal No. 42 and D-09 wheel speed
sensor <RR> connector terminal No. 2
• Open circuit check of wheel speed sensor <RR> circuit
Q: Is the check result normal?
YES : Go to Step 15.
NO : Repair the wiring harness. Then go to Step 16.
AC400817CM
ASC-ECU
MB991997
Check harness
A-05 ASC-ECU
harness connector