1986 TOYOTA LAND CRUISER ignition

F17758
Cowl Side J/B LH BatteryEngine Room J/B
Cowl Side J/B LH
Cowl Side J/B RH J4
J/C
Cowl Side J/B LH
IG1 No. 2 Relay
ECU-IG1
AM1
ALT
MAINFL Block
EE IFIG2
IG1
GND4
GND3
GND1
GND2 A44
A42
A42 A42
A41
A41 2A
2B3
13 J/B No. 2
IFF15 F16
2 12C1
2E 2E
2B
3918 37
12
533B 3E22 4IGN2A
2E41 10 1
1C 1B9 AM2
W-R
B-R B-R
B-R B-G
W-R
L-B
B-R
AA
B-G
W-B B-W
W-B
W-B 4
62
7 IG1
AM1
AM2 IG2
W-B
22
6
17
8
31
6 ABS & BA & TRAC
& VSC ECU
W-B
W-B
W-B
W-B
W-B I18
Ignition SW
DI-558- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
751 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1241 / 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1241 / 41
Detection of any of the conditions 1. through 4.:
1. Vehicle speed is 1.9 mph (3 km/h) or more and voltage
of ECU terminal IG remains below 9.5 V for more than
10 sec.
2. While the condition that the solenoid relay is ON contin-
ues, ECU terminal IG1 voltage becomes 9.5 V or less,
and the condition that the contact point of the solenoid
relay is OFF continues for 0.2 sec. or more.
3. The condition that ECU terminal IG1 voltage is more
than 17.0 V continues for 1.2 sec. or more.
4. While the solenoid relay outputs ON signal, ECU termi-
nal IG1 voltage becomes more than 17.0 V, and the
condition that the contact point of the solenoid relay is
OFF continues for 0.2 sec. or more.

Battery

IC regulator

Power source circuit
WIRING DIAGRAM
DIC9N-01

F09165
GND1GND2
IG1 GND3
GND4
(-)(+) ON
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-559
752 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check battery positive voltage.
OK:
Voltage: 10 to 14 V
NG Check and repair the charging system.
OK
2 Check voltage of the ECU IG power source.
In case of using the hand-held tester:
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 the voltage condition output from the ECU displayed on the hand-held tester.
OK:
ºNormalº is displayed.
In case of not using the hand-held tester:
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals IG1 and GND of the
skid control ECU connector.
OK:
Voltage: 10 to 14 V
OK Turn ignition switch OFF, check and replace
skid control ECU.
NG

F17758
Cowl Side J/B LH BatteryEngine Room J/B
Cowl Side J/B LH
Cowl Side J/B RH J4
J/C
Cowl Side J/B LH
IG1 No. 2 Relay
ECU-IG1
AM1
ALT
MAINFL Block
EE IFIG2
IG1
GND4
GND3
GND1
GND2 A44
A42
A42 A42
A41
A41 2A
2B3
13 J/B No. 2
IFF15 F16
2 12C1
2E 2E
2B
3918 37
12
533B 3E22 4IGN2A
2E41 10 1
1C 1B9 AM2
W-R
B-R B-R
B-R B-G
W-R
L-B
B-R
AA
B-G
W-B B-W
W-B
W-B 4
62
7 IG1
AM1
AM2 IG2
W-B
22
6
17
8
31
6 ABS & BA & TRAC
& VSC ECU
W-B
W-B
W-B
W-B
W-B I18
Ignition SW
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-561
754 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1242 / 42 IG2 Power Source Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1242 / 42With the vehicle running, open circuit in IG2 is detected for
more than 7 sec.
Battery

IC regulator

Power source circuit
WIRING DIAGRAM
DIC9O-01

F09165
GND1GND2
IG1 GND3
GND4
(-)(+) ON
DI-562- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
755 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check battery positive voltage.
OK:
Voltage: 10 to 14 V
NG Check and repair the charging system.
OK
2 Check voltage of the ECU IG power source.
In case of using the hand-held tester:
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 the voltage condition output from the ECU displayed on the hand-held tester.
OK:
ºNormalº is displayed.
In case of not using the hand-held tester:
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals IG2 and GND of the
skid control ECU connector.
OK:
Voltage: 10 to 14 V
OK Turn ignition switch OFF, check and replace
skid control ECU.
NG

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-565
758 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step1 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 skid control ECU.
NG

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-571
764 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 master cylinder pressure 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 DATA LIST mode on the hand-held tester.
CHECK:
Check that the brake fluid pressure value of the master cylinder pressure sensor displayed on the hand-held
tester is changing when depressing the brake pedal.
OK:
Brake fluid pressure value must be changing.
OK Go to step 4.
NG
2 Check master cylinder pressure sensor.
PREPARATION:
(a) Install the LSPV gauge to the front caliper bleeder plug portion, and bleed the LSPV gauge.
SST 09709-29018
(b) Remove the air cleaner inlet and battery clamp cover.
CHECK:
Start the engine and depress the brake pedal, then check the relation between the fluid pressure and voltage
of PMC and E2 terminals of the skid control ECU with connectors still connected.
OK:
Front brake caliper fluid pressureVoltage
0 kPa (0 Kgf/cm2, 0 psi)0.37 to 0.63 V
5,883 kPa (60 kgf/cm2, 853 psi)1.57 to 1.83 V
11,768 kPa (120 kgf/cm2, 1,706 psi)2.77 to 3.03 V
HINT:
Voltage between terminals VCM and E2: 4.7 to 5.3 V
NG Replace master cylinder pressure sensor.
OK

F17712
ABS & BA & TRAC
& VSC Actuator
Engine Room R/B
FL Block
Cowl Side J/B LH
Battery ABS MTR2 Relay
ABS MTR1 RelayMTT A4127
MT+ A4128
MT- A4118
MR2
A442
R2+
A443
W-L
1
1C 1
1 1
2ABS No.2
3 41
2 1
1
1
1B-R
L
GR
Y-B A387
A385
A388
A383
L-R
R
A372
A371
A386
A401
W-BW-BW-B
W-B W-B
EE2A3
IF
GND GND2GND1BM1 BM2 MT- MT+MTT
B-GF152
MAIN
P
R
A41MR1 29 A41
R1+ 1
W-B 43
21ABS & BA & TRAC
& VSC ECU
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-577
770 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1251 / 51 Hydraulic Brake Booster Pump Motor
Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1251 / 51
Either of the following 1. or 2. is detected:
1. After turning the ignition switch ON, the current of more
than 30 A flows to the motor for more than 1 sec.
2. After turning the ignition switch ON, less than 7 A
change in current is detected more than 3 times in a row
when the motor is ON.
Hydraulic brake booster pump motor
WIRING DIAGRAM
DIC9T-02

F17712
ABS & BA & TRAC
& VSC ECU ABS & BA & TRAC
& VSC Actuator
Engine Room R/B
FL Block
Cowl Side J/B LH
Battery ABS MTR2 Relay
ABS MTR1 RelayMTT A4127
MT+ A4128
MT- A4118
MR2
A442
R2+
A443
W-L
1
1C 1
1 1
2ABS No.2
3 41
2 1
1
1
1B-R
L
GR
Y-B A387
A385
A388
A383
L-R
R
A372
A371
A386
A401
W-BW-BW-B
W-B W-B
EE2A3
IF
GND GND2GND1BM1 BM2 MT- MT+MTT
B-GF152
MAIN
P
R
A41MR1 29 A41
R1+ 1
W-B 43
21 DI-580
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
773 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1252 / 52 Hydraulic Brake Booster Pump Motor
ON Time Abnormally Long
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1252 / 52After the ignition switch is turned ON, the power is supplied
to the pump motor for more than 5 minutes.
Hydraulic brake booster pump motor

Hydraulic brake booster pump motor circuit

Pressure switch (PH or PL)
WIRING DIAGRAM
DIC9U-02