Diagnostic Trouble Codes (DTCs): 20, 22, 24, 28
—The 4WS indicator light has
been reported on.
—With service check connector
jumped codes 20, 22, 24, 28
are indicated.
Disconnect the front main steering
angle sensor connector.
Turn the ignition switch ON.
Measure voltage between the
4WS control unit side connector
No. 1 terminal (BLK/YEL) and
body ground.
Is there battery voltage?
Measure the voltage between the
4WS control unit side of the sensor
connector No. 4 terminal (LT
GRN) and body ground.
Is there approximately 4.5 V?
(To page
17-56)
FRONT MAIN STEERING ANGLE SENSOR
4WS CONTROL UNIT SIDE CONNECTOR
View from terminal side.
FRONT MAIN STEERING ANGLE SENSOR
4WS CONTROL UNIT SIDE CONNECTOR
Repair open in the harness wire
between the No. 22 4WS fuse
and the front main steering angle
Disconnect the 4WS control unit
18P connector.
Check for continuity between the
4WS control unit No. 8 terminal
(GRN) and body ground.
Is there continuity?
Connect the 4WS control unit
18P connector.
Measure voltage between the
4WS control unit No. 8 terminal
(GRN) and body ground.
Is there approximately 4.5 V?
Repair open in the GRN wire between
the 4WS control unit and
the front main steering angle
sensor.
View from terminal side.
4WS CONTROL UNIT 18P
SENSOR SIDE CONNECTOR
Continuity?
View from terminal side.
Repair short in the GRN wire between
the 4WS control unit and
the main steering angle sensor.
4WS CONTROL UNIT 18P CONNECTOR
Replace the 4WS control unit.
View from terminal side.
Battery Voltage?
4.5 V?
4.5 V?
Troubleshooting (4WS)
Diagnostic Trouble Codes (DTCs): 20, 22, 24, 28 (cont'd)
(From page
17-55)
Measure the voltage between the
4WS control unit side of the sensor
connector No.3 terminal (BLU)
and body ground.
Is there approximately 4.5 V?
(To page 17-57)
FRONT MAIN STEERING ANGLE SENSOR
4WS CONTROL UNIT SIDE CONNECTOR
Disconnect the 4WS control unit
18P connector.
Check for continuity between the
4WS control unit No. 3 terminal
(BLU) and body ground.
Is there continuity?
Is there approximately 4.5 V?
View from terminal side.
4WS CONTROL UNIT 18P
SENSOR SIDE CONNECTOR
View from terminal side.
Repair short in the BLU wire between
the 4WS control unit and
the main steering angle sensor.
4WS CONTROL UNIT 18P CONNECTOR
View from terminal side.
Replace the 4WS control unit.
Repair open in the BLU wire between
the 4WS control unit and
the front main steering angle
sensor.
Connect the 4WS control unit
18P connector.
Continuity
(From page
17-56)
Measure the voltage between the
4WS control unit side of the sensor
connector No. 2 terminal
(YEL/RED) wire and body ground.
Is there approximately 4.5 V?
(To page 17-58)
FRONT MAIN STEERING ANGLE SENSOR
4WS CONTROL UNIT SIDE CONNECTOR
Disconnect the 4WS control unit
18P connector.
Check for continuity between the
4WS control unit No. 1 5 terminal
(YEL/RED) and body ground.
Is there continuity?
Is there approximately 4.5 V?
View from terminal side.
4WS CONTROL UNIT 18P
SENSOR SIDE CONNECTOR
View from terminal side.
Repair short in the YEL/RED wire
between the 4WS control unit and
the main steering angle sensor.
4WS CONTROL UNIT 18P CONNECTOR
Replace the 4WS control unit.
Repair open in the YEL/RED wire
between the 4WS control unit and
the front main steering angle
sensor.
Measure voltage between the
4WS control unit No. 1 5 terminal
(YEL/RED) and body ground.
Connect the 4WS control unit
18P connector.
View from terminal side.
Troubleshooting (4WS)
Diagnostic Trouble Codes (DTCs): 20, 22, 24, 28 (cont'd)
(From page
17-57)
Check for voltage between the
No.2 terminal (YEL/RED) and the
No. 5 terminal (BLK) of the 4WS
control unit side connector of the
front main steering angle sensor.
Is there approximately 4.5 V?
Reconnect the front main steering
angle sensor 5P connector.
While turning the steering wheel,
check for the signals between the
following 4WS control unit terminals
and the body ground with an
analog voltmeter on the DC range.
A-phase:
Between the No. 8 terminal (GRN)
and body ground: should pulse
0 4.5 V rapidly (every 2°)
B-phase:
Between the No. 15 terminal
(YEL/RED) and body ground:
should pulse 0 4.5 V rapidly (every
2°)
Z-phase:
Between the No. 12 terminal
(BLU) and body ground: should
pulse 0 4.5 V once per steering
wheel revolution
Are the signals available between
the respective terminal
and the body ground?
Check the Z-phase neutral position
(see page
17-146).
Is the Z-phase in the straight
driving position?
Perform troubleshooting for DTCs
10, 12, 16.
(see page
17-45).
Repair the poor ground (G 401,
402,404) or open in the BLK wire
between the front main steering
angle sensor and body ground.
FRONT MAIN STEERING ANGLE SENSOR
4WS CONTROL UNIT SIDE CONNECTOR
4.5 V?
View from terminal side
4WS CONTROL UNIT 18P CONNECTOR
View from terminal side
Replace the front main steering
angle sensor.
Adjust the front main steering angle
sensor neutral position
(see page 17-15).