Page 783 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-531
724 Author: Date:
2004 LAND CRUISER (RM1071U)
DTCC0278 / 11, C0279 / 12ABS Solenoid Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
C0278 / 11
Conditions 1. and 2. continue for 0.2 sec. or more:
1. ECU terminal IG1 voltage is 9.5 V to 17.0 V and the
solenoid relay is ON, however, the contact point of the
solenoid relay is OFF.
2. With solenoid relay ON, ECU terminal IG1 voltage be-
comes 9.5 V or less and the contact point of the sole-
noid relay does not become ON.
ABS solenoid relay
ABS solenoid relay circuit
C0279 / 12
Immediately after ECU terminal IG1 becomes ON, and
solenoid relay is OFF, however, when the condition that
the solenoid relay due to the contact point is ON continues
for 0.2 sec. or more.
WIRING DIAGRAM
Refer to DTC C0226/21 on page DI-528.
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
1 Check ABS solenoid relay operation.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the hand-held tester.
CHECK:
Check the operation sound of the ABS solenoid relay when operating it with the hand-held tester.
OK:
The operation sound of the ABS solenoid relay should be heard.
OK Go to step 6.
NG
DIC98-02
Page 791 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-539
732 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check whether zero point calibration of yaw rate sensor has been done or not.
PREPARATION:
Shift the shift lever in the P position and turn the ignition switch ON. Repeat connecting and releasing Ts
and E
1 terminals of the DLC1 4 times or more for 8 sec. After that do not move the vehicle for 15 sec. or more.
CHECK:
Check that theºVSC TRACº warning light and ºVSC OFFº indicator light light up for 15 sec.
OK No problem.
NG
2 Check for open and short circuit in harness and connector between PNP switch
(P position) and skid control ECU and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
3 Check for open and short circuit in harness and connector between yaw rate
sensor and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
4 Check yaw rate sensor (See page DI-553).
NG Replace yaw rate sensor.
OK
Check and replace skid control ECU.
Page 794 of 3115
F02807
ON
NEO
(+)
(-)
F03007
(Reference)
10 to 14 V
Below 1 V
DI-542- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
735 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check voltage between terminal NEO of skid control ECU and body ground.
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminal NEO of the skid con-
trol ECU and body ground for the engine conditions be-
low.
OK:
Engine conditionVoltage
OFF (IG ON)10 to 14 V or below 1 V
ON (Idling)10 to 14 V e below 1 V (Pulse)
NG Check and replace skid control ECU or ECM.
OK
If the same codes are still output after the DTC is deleted, check the contact condition of each
connection.
Page 799 of 3115
F17753
ABS & BA & TRAC
& VSC ECU C17
Combination Meter
B-R B-W14
A43
23
A43
1
F16 SS1+
SS1-
IG1
ESS3
11
1
2W
GWW
G
G
6II3 27
IG1 15
IG1 16
IH2II3
L-B
W-B SB2C1 39
16
37 2E
2E 2Q
3
215B-GSS1+
SS1-
Battery
IFIF
2Q Cowl Side J/B LHIH29 42IG1
AM1
ALTFL Block AM1
ECU-IG1 26
23Cowl Side J/B LH
IG1 No.2 Relay
I18
Ignition SW SB
J/B No.2
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-547
740 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
Page 800 of 3115
F17609
ESS (-)
IG (+)
BAT (+)
DI-548- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
741 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
1 Check output value of the steering angle sensor.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the DATALIST mode on the hand-held tester.
CHECK:
Check that the steering wheel turning angle value of the steering angle position sensor displayed on the
hand-held tester is changing when turning the steering wheel.
HINT:
After certifying ºZeroº point calibration of the steering angle sensor (Speed: 21 mph (35 km/h), driving straight
ahead for 10 sec. or more), the value will change.
OK:
Steering wheel turning angle value must be changing.
OK Go to step 5.
NG
2 Check input voltage of the steering angle sensor.
PREPARATION:
Remove the column lower cover.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals 1 and 2, 2 and 9 of
the combination switch wire harness side connector.
OK:
Voltage: 10 to 14 V
NG Check and replace harness and connector.
OK
Page 803 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-551
744 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1232 / 32 Deceleration Sensor Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1232 / 32
Detection of either of the conditions 1. or 2.:
1. At a vehicle speed of 6 mph (10 km/h) or more, when
the condition that ECU terminal GL1 signal change
range is less than 20 mV, and ECU terminal GL2 signal
change range swings by 468 mV or more occurs for 30
sec. or more.
2. At a vehicle speed of 6 mph (10 km/h) or more, when
the condition that ECU terminal GL2 signal change
range is less than 20 mV, and ECU terminal GL1 signal
change range swings by 468 mV or more occurs for 30
sec. or more.
Deceleration sensor
Deceleration sensor circuit
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
1 Check output value of the yaw rate (deceleration) sensor.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the DATALIST mode on the hand-held tester.
CHECK:
Check that the deceleration value of the deceleration sensor displayed on the hand-held tester is changing
when tilting the vehicle.
OK:
Deceleration value must be changing.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
DIC9K-02
Page 807 of 3115
F12727
F13720
1
65ON
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-555
748 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check output value of the yaw rate sensor.
In case of using the hand-held tester:
PREPARATION:
(a) Remove the 2 bolts and yaw rate sensor with connectors
still connected.
(b) Connect the hand-held tester to the DLC3.
(c) Turn the ignition switch ON and push the hand-held tes-
ter main switch ON.
(d) Select the DATALIST mode on the hand-held tester.
CHECK:
Check that the yaw rate value of the yaw rate sensor displayed
on the hand-held tester changes. Place the yaw rate sensor
vertically to the ground and turn the sensor pivoted on its center.
OK:
Yaw rate value must be changing.
In case of not using the hand-held tester:
PREPARATION:
(a) Remove the yaw rate sensor with the connector still con-
nected to it.
(b) Turn the ignition switch to ON.
CHECK:
Measure voltage between terminals YAW2 (1) - GYAW (5), and
terminals YD (6) - GYAW (5) of the yaw rate sensor.
OK:
Terminals 1 and 5
(YAW2 - GYAW)About 2.42 V to 2.58 V
Terminals 6 and 5
(YD - GYAW)About 4.5 V to 5.3 V
NG Replace yaw rate sensor.
OK
Page 808 of 3115
F02864
ON
GND1
(-)YD
(+)
DI-556- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
749 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check voltage between terminals YD and GND of ABS & BA & TRAC & VSC ECU.
PREPARATION:
Remove the ABS & BA & TRAC & VSC ECU with connectors
still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals YD and GND of the
ABS & BA & TRAC & VSC ECU.
OK:
Voltage: 4.5 to 5.3 V
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
5 Check for open and short circuit in harness and connector between yaw rate
sensor and ABS & BA & TRAC & VSC ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
