ABS DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-109
STEP 7. Resistance measurement at A-01 ABS-ECU
connector
(1) Disconnect the ABS-ECU connector, connect special tool
ABS check harness (MB991974) to the harness-side
connector, and then measure the resistance at the special
tool connector side.
NOTE: Do not connect the special tool ABS check harness
(MB991974) to ABS-ECU.
(2) Disconnect the fusible link No.27.
(3) Measure the resistance between the terminal No.26 and the
body ground.
OK: No continuity
Q: Is the check result normal?
YES : Replace the fusible link No.27. Then go to Step 11.
NO : The short circuit may be present in the power supply
circuit. Repair the wiring harness between the A-01
ABS-ECU connector terminal No.26 and the fusible
link No.27, and then replace the fusible link No.27.
Then go to Step 11.
STEP 8. Voltage measurement at the A-01 ABS-ECU
connector
(1) Disconnect the ABS-ECU connector, connect special tool
ABS check harness (MB991974) to the harness-side
connector, and then measure the resistance at the special
tool connector side.
NOTE: Do not connect the special tool ABS check harness
(MB991974) to ABS-ECU.
(2) Measure the voltage between the terminal No.26 and the
body ground.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 9.
NO : The open circuit may be present in the power supply
circuit. Repair the wiring harness between the A-01
ABS-ECU connector terminal No.26 and the fusible
link No.27. Then go to Step 11.
AC606869 HJ
ABS-ECU
MB991974
Check harness
A-01 ABS-ECU
harness connector
AC606869AM
ABS-ECU
MB991974
Check harness
A-01 ABS-ECU
harness connector