Code No. 16: ABS-ECU Power Supply System (ABS-ECU Power Supply Voltage or Valve Relay Power Supply Voltage below or above the Specified Value)

CIRCUIT OPERATION

The ABS-ECU power is supplied to the ABS-ECU (terminal 20) from the ignition switch (IG2) through the multi-purpose fuse number 12 in the junction block.

DIAGNOSIS CODE 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 diagnosis code is to set are:

Malfunction of battery

Damaged wiring harness and connector

Malfunction of hydraulic unit and ABS-ECU

DIAGNOSIS

STEP 1. Check the battery.

Refer to GROUP 54A, Battery - On-vehicle Service - Battery Testing Procedure

Q: Is the battery damaged?

YES: Charge or replace the battery and then go to Step 4

.
NO: Go to Step 2

STEP 2. Check the charging system.

Refer to GROUP 16, Charging System - Diagnosis

Q: Is the charging system damaged?

YES: Repair the Charging System and then go to Step 4

.
NO: Go to Step 3

STEP 3. Check the harness wire between junction block connector C-203 terminal 2 and ABS-ECU connector B-03 terminal 20.

NOTE: After inspecting intermediate connector C-202 and C-106, inspect the wire. If intermediate connector C-202 and C-106 is damaged, repair or replace it. Then go to Step 4

Q: Is the harness wire between junction block connector C-203 terminal 2 and ABS-ECU connector B-03 terminal 20 damaged?

YES: Repair it and go to Step 4

.
NO: Erase the diagnosis code memory, and recheck if any diagnosis code sets. If diagnosis code No. 16 sets, replace the hydraulic unit (integrated with ABS-ECU) and then go to step 4

. If diagnosis code No. 16 is not output then an intermittent malfunction is suspected. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction

STEP 4. Check whether the diagnosis code is reset.

Q: Does diagnosis code No. 16 reset?

YES: Start over at Step 1

.
NO: The procedure is complete.


Code No. 16: ABS-ECU Power Supply System (ABS-ECU Power Supply Voltage or Valve Relay Power Supply Voltage below or above the Specified Value)

CIRCUIT OPERATION The ABS-ECU power is supplied to the ABS-ECU (terminal 20) from the ignition switch (IG2) through the multi-purpose fuse number 12 in the junction block.
DIAGNOSIS CODE 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 diagnosis code is to set are: Malfunction of battery Damaged wiring harness and connector Malfunction of hydraulic unit and ABS-ECU
	DIAGNOSIS

	STEP 1. Check the battery. Refer to GROUP 54A, Battery - On-vehicle Service - Battery Testing Procedure . Q: Is the battery damaged? YES: Charge or replace the battery and then go to Step 4. NO: Go to Step 2.
	STEP 2. Check the charging system. Refer to GROUP 16, Charging System - Diagnosis . Q: Is the charging system damaged? YES: Repair the Charging System and then go to Step 4. NO: Go to Step 3.
	STEP 3. Check the harness wire between junction block connector C-203 terminal 2 and ABS-ECU connector B-03 terminal 20. NOTE: After inspecting intermediate connector C-202 and C-106, inspect the wire. If intermediate connector C-202 and C-106 is damaged, repair or replace it. Then go to Step 4 . Q: Is the harness wire between junction block connector C-203 terminal 2 and ABS-ECU connector B-03 terminal 20 damaged? YES: Repair it and go to Step 4. NO: Erase the diagnosis code memory, and recheck if any diagnosis code sets. If diagnosis code No. 16 sets, replace the hydraulic unit (integrated with ABS-ECU) and then go to step 4 . If diagnosis code No. 16 is not output then an intermittent malfunction is suspected. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .
	STEP 4. Check whether the diagnosis code is reset. Q: Does diagnosis code No. 16 reset? YES: Start over at Step 1 . NO: The procedure is complete.