DTC 53

DTC 53: Motor Relay Problem (Stays off)






CIRCUIT OPERATION
Power is continuously supplied to the ABS-ECU through fusible link number 3 to operate the solenoid valve and motor.

ABS DTC SET CONDITIONS
These codes are displayed if the power supply circuit of solenoid valve or motor is open or shorted.

TROUBLESHOOTING HINTS
The most likely causes for these DTCs to set are:
^ Damaged wiring harness or connector
^ Malfunction of the brake modulator hydraulic unit (integrated with ABS-ECU)

DIAGNOSIS
Required Special Tools:
^ MB991223: Harness Set
^ MB991529: Diagnostic Trouble Code Check Harness
^ MB991958: Scan Tool (MUT-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: MUT-III USB Cable
^ MB991911: MUT-III Main Harness B

STEP 1. Check the solenoid valve or motor power supply circuit. Measure the voltage at ABS-ECU connector B-118.





1. Disconnect ABS-ECU connector B-118 and measure at the harness side.
2. Measure the voltage between terminal 11 and ground, and 33 and ground. It should measure approximately 12 volts (battery positive voltage).
Q: Is battery positive voltage (approximately 12 volts) present?
YES: Replace the brake modulator hydraulic unit (integrated with ABS-ECU). Then go to Step 4.
NO: Go to Step 2.

STEP 2. Check the following connectors.





^ ABS-ECU connector B-118





^ Intermediate connector A-12 Check the connectors, for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES: Go to Step 3.
NO: Repair it and then go to Step 4.

STEP 3. Check the following harness wires.








^ The wire between fusible link No.3 and ABS-ECU connector B-118 (terminal 11)
^ The wire between fusible link No.3 and ABS-ECU connector B-118 (terminal 33)
Q: Is any harness wire damaged?
YES: Repair or replace it and then go to Step 4.
NO: Go to Step 4.

STEP 4. Recheck for diagnostic trouble code.





Check again if the DTC is set.
1. Turn the ignition switch to the ON position.
2. Erase the DTC.
3. Turn the ignition switch to the LOCK (OFF) position.
4. Turn the ignition switch to the ON position.
5. Check if the DTC is set.
6. Turn the ignition switch to the LOCK (OFF) position.
Q: Do diagnostic trouble codes 41, 42, 43, 44, 52, 53 or 55 reset?
YES: Return to Step 1.
NO: The procedure is complete.