DTC 16

DTC 16: ABS-ECU Power Supply System (abnormal voltage drop or rise)









CIRCUIT OPERATION
The ABS-ECU power is supplied to the ABS-ECU (terminal 10) from the ignition switch (IG2) through the multi-purpose fuse number 12 in the junction block.

ABS DTC SET CONDITIONS
Output is provided when ABS-ECU power supply voltage drops below or rises above the normal value. Output is not provided if power supply voltage returns to normal voltage.

TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
^ Malfunction of battery
^ Damaged wiring harness and connector
^ Malfunction of brake modulator hydraulic unit and 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 battery.
Q: Is the battery damaged?
YES: Charge or replace the battery and then go to Step 5.
NO: Go to Step 2.

STEP 2. Check the charging system.
Refer to Charging System - Charging System Diagnosis.
Q: Is the charging system damaged?
YES: Repair the Charging System and then go to Step 5.
NO: Go to Step 3.

STEP 3. Check the following connectors.





^ ABS-ECU connector B-118





^ Intermediate connector C-124





^ Junction block connectors C-210, C-211 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 4.
NO: Repair it and then go to Step 5.

STEP 4. Check the following harness wire.








The wire between ABS-ECU connector B-118 (terminal 10) and junction block connector C-211 (terminal 2)
Q: Is the harness wire damaged?
YES: Repair or replace it and then go to Step 5.
NO: Go to Step 5.

STEP 5. 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: Does DTC 16 reset?
YES: Start over at Step 1.
NO: The procedure is complete.