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DI-300
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6BS-08
DTC C1251 / 51 Hydraulic Brake Booster Pump Motor
Malfunction
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
Either of the condition 1. or 2. is detected:
1. After the ignition switch is turned ON, the current of
more than 30 A flows to the motor for more than 1 sec.
C1251 / 51 Hydraulic brake booster pump motor
2. After the ignition switch is turned ON, less than 7 A
change in current is detected more than 3 times continu-
ously when the motor is ON.
WIRING DIAGRAM
Skid Control ECU
1
VSC R/B R-B
V16 R1+
TRC MTR Relay 2
Y-B
5 V17 R2+
R2+ MR2 5
3 4 1
R P-B
BM2 V17 MR2
5 +BM2 5
1 2 Hydraulic Brake Booster
ABS MTR Relay 3
W
R V11
BM1 BM2
5 5
1 +BM1 2 2 7 27
L P-B
V10 V11 V16 MMT
5 R1+ MR1 5 BM1 MTT
3 4
F13 5 28
6 GR
Fuse Box W-B GHD2 V11 V16 MT+
V11 MT+
R ABS2 W-R
1 2 1 18
8
O
Engine Room J/B V10 V11 V16 MT-
GND1 MT-
29
W L-B
2 2 V16 MR1
A A
W-B W-B
J2 J1
Battery EA EB
J/C
F14348
2002 4RUNNER (RM887U)
Author : Date : 476
DI-301
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Check operation of hydraulic brake booster pump motor.
PREPARATION:
BM2 Disconnect the 2 connectors from the hydraulic brake booster.
(-) (+)
CHECK:
EM2 Connect battery positive (+) lead to BM1 or BM2 terminal and
battery negative (-) lead to EM1 or EM2 terminal of the hydrau-
(-)
lic brake booster (pump motor) connector.
OK:
(+) EM1 The operation sound of the pump motor should be
BM1
F02859 heard.
NG Go to step 4.
OK
2 Check hydraulic brake booster resistance.
BM2 PREPARATION:
MT+ EM2 Disconnect the 2 connectors from the hydraulic brake booster.
MT-
CHECK:
Check resistance between terminals MT+ and MT-, BM1 and
BM1
MT, BM2 and MT, EM1 and MT+, EM2 and MT+ of the hydraulic
MT brake booster connector.
EM1 OK:
30 - 36
F04505
NG Replace hydraulic brake booster assembly.
OK
2002 4RUNNER (RM887U)
Author : Date : 477
DI-302
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
3 Check for open circuit in harness and connector between hydraulic brake boost-
er (MT+, MT-) and skid control ECU (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
4 Check for open and short circuit in harness and connector between hydraulic
brake booster pump motor and hydraulic brake booster (See page IN-28 ).
NG Replace wire harness.
OK
5 Check hydraulic brake booster pump motor (See page BR-42 ).
NG Replace hydraulic brake booster pump motor.
OK
Replace hydraulic brake booster.
2002 4RUNNER (RM887U)
Author : Date : 478
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