ABS – Troubleshooting
35B-5
Code No.16: ABS-ECU power supply system (abnormal
voltage drop or rise)
Probable cause
This code is output if the ABS-ECU or valve relay power supply voltage drops below
or rises above the rated values.
The valve relay power supply voltage is detected based on the voltage in the valve
relay monitor line.
D Malfunction of battery
D Malfunction of wiring harness or connector
D Malfunction of valve relay
D Malfunction of ABS-ECU
Caution
If battery voltage drops or rises during inspection, this code will be output as well, making it
impossible to obtain correct diagnostic results.
Before carrying out the following inspection, check the battery level, and refill it if necessary.
OK
Replace ABS-ECU.
OK
Replace the ABS-ECU.
OK
Check the trouble symptom.
NG
Check the harness wire, and repair
if necessary.
D Between ignition switch and
ABS-ECU
OK
Check the trouble symptom.
NG
Check the harness wire, and repair
if necessary.
D Between general-purpose fuse
No. 6 and valve relay
NG
Repair
OK
Check the harness wire for short
circuit, and repair if necessary.
D Between valve relay and hydraulic
unit
D Between valve relay and motor
relay
NG
Repair
OK
NG
Check the harness wire, and repair
if necessary.
D Between valve relay and ABS-ECU
NG
Repair
OK
Check the trouble symptom.
OK
Check the trouble symptom.
NG
Check the harness wire, and repair
if necessary.
D Between general-purpose fuse
No. 6 and valve relay
OK
Measure at the ABS-ECU connector
B-25.
D Connector connected
D Ignition switch: ON
(1) Voltage between 37 and body
ground
OK: Battery voltage
(2) Voltage between 48 and body
ground
OK: Battery voltage
(1) NG
Check the following connectors:
A-76, B-25
NG
Repair
(2) NG
Check the following connectors:
A-76, B-25
NG
Repair
OK
Check the valve relay.
NG
Replace
OK
Check the trouble symptom.
NG
Check the harness wire, and repair
if necessary.
D Between fusible link No. 8 and
valve relay
OK
Measure at the valve relay connector
A-76.
D Disconnect the connector, and
measure at the harness side
connector.
D Ignition switch: ON
(1) Voltage between 6 and body
ground
OK: Battery voltage
(2) Voltage between 2 and body
ground
OK: Battery voltage
(1) NG
Check the following connector:
A-76
NG
Repair
(2) NG
Check the following connector:
A-76
NG
Repair
Measure at the ABS-ECU connector
B-24.
D Disconnect the connector, and
measure at the harness side
connector.
D Start the engine.
D Voltage between 13 and body
ground
OK: Battery voltage
NG
Check the following connectors:
B-24, B-52, B-74, B-76
NG
Repair
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