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DI-303
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6BT-08
DTC C1252 / 52 Hydraulic Brake Booster Pump Motor
ON Time Abnormally Long
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
S Hydraulic brake booster pump motor
After the ignition switch has been turned ON, the power is
C1252 / 52 S Hydraulic brake booster pump motor circuit
supplied to the pump motor for more than 5 minutes.
S Pressure switch (PH or PL)
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 : 479
DI-304
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Check operation of hydraulic brake booster pump motor.
PREPARATION:
V11 Disconnect the 2 connectors from (V10, V11) the hydraulic
(-) (+)
BM2 brake booster.
EM2 CHECK:
Connect battery positive (+) lead to BM1 or BM2 terminal and
(-)
V10 battery negative (-) lead to EM1 or EM2 terminal of the hydrau-
lic brake booster (pump motor) connector.
(+) EM1 OK:
BM1
F02859 The operation sound of the pump motor should be
heard.
NG Go to step 9.
OK
2 Check for short circuit (to B+) in harness and connector between BM1 or BM2 of
hydraulic brake booster and ABS MTR relay or TRC MTR relay (See page
IN-28 ).
NG Repair or replace harness or connector.
OK
3 Check for short circuit (to B+) in harness and connector between MT of hydrau-
lic brake booster and skid control ECU (See page IN-28 ).
NG Repair or replace harness or connector.
OK
2002 4RUNNER (RM887U)
Author : Date : 480
DI-305
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
4 Check pressure switch (PH).
In case of using the hand-held tester:
PREPARATION:
(a) Connect the hand-held tester to 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:
Depress the brake pedal more than 40 times with the ignition switch OFF then turn the ignition switch ON
and check the pressure switch (PH) condition.
HINT:
When the pressure in power supply system is released, reaction force becomes heavy and stroke becomes
shorter.
OK:
"OFF" turns to "ON".
HINT:
OFF: Low pressure
ON: High pressure
In case of not using the hand-held tester:
PREPARATION:
(a) Disconnect the connector (V10) from the hydraulic brake
LOCK ON booster.
PH (b) With the ignition switch OFF, depress the brake pedal
V10 more than 40 times to decrease the accumulator pres-
sure.
HINT:
PHG When the pressure in power supply system is released, reac-
F02861 tion force becomes heavy and stroke becomes shorter.
CHECK:
Measure resistance between terminals PH and PHG of the hy-
draulic brake booster connector.
OK:
Resistance: 1.0 k
PREPARATION:
(a) Connect the connector (V10) to the hydraulic brake
booster.
(b) Disconnect the connector (V10) after the ignition switch
has been ON and the pump motor has stopped.
CHECK:
Measure resistance between terminals PH and PHG of the hy-
draulic brake booster connector.
OK:
Resistance: 0
HINT:
After inspection, connect the connector and clear the DTC (See
page DI-224 ).
NG Replace hydraulic brake booster assembly.
2002 4RUNNER (RM887U)
Author : Date : 481
DI-306
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
OK
5 Check pressure switch (PL).
In case of using the hand-held tester:
PREPARATION:
(a) Connect the hand-held tester to 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:
Depress the brake pedal more than 40 times with the ignition switch OFF then turn the ignition switch ON
and check the pressure switch (PL) condition.
HINT:
When the pressure in power supply system is released, reaction force becomes heavy and stroke becomes
shorter.
OK:
"OFF" turns to "ON".
HINT:
OFF: Low pressure
ON: High pressure
In case of not using the hand-held tester:
PREPARATION:
V11
(a) Disconnect the connector (V11) from the hydraulic brake
PL booster.
LOCK ON
(b) With the ignition switch OFF, depress the brake pedal
PLG more than 40 times to decrease the accumulator pres-
sure.
HINT:
When the pressure in power supply system is released, reac-
F02863 tion force becomes heavy and stroke becomes shorter.
CHECK:
Measure resistance between terminals PL and PLG of the hy-
draulic brake booster connector.
OK:
Resistance: 5.7 k
PREPARATION:
(a) Connect the connector (V11) to the hydraulic brake
booster.
(b) Disconnect the connector (V11) after the ignition switch
has been ON and the pump motor has stopped.
CHECK:
Measure resistance between terminals PL and PLG of the hy-
draulic brake booster connector.
OK:
Resistance: 1.0 k
2002 4RUNNER (RM887U)
Author : Date : 482
DI-307
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
HINT:
After inspection, connect the connector and clear the DTC (See
page DI-224 ).
NG Replace hydraulic brake booster assembly.
OK
6 Check for short circuit (to B+) in harness and connector between pressure
switch and skid control ECU (See page IN-28 ).
NG Repair or replace harness or connector.
OK
7 Check ABS MTR relay and TRC MTR relay.
PREPARATION:
Remove the ABS MTR relay and TRC MTR relay from VSC R/B.
2 1 CHECK:
Check continuity between each pair of terminals of the motor
4 3 relay.
OK:
Open
Continuity
1 Terminals 3 and 4
(Reference value 1)
2 Terminals 1 and 2 Open
*1: ABS MTR relay 62
TRC MTR relay 54
4
Continuity
3
Continuity
1
CHECK:
2 (a) Apply battery positive voltage between terminals 3 and 4.
(b) Check continuity between terminals.
OK:
(-) 4 3
Terminals 1 and 2 Continuity
(+)
F00044
2002 4RUNNER (RM887U)
Author : Date : 483
DI-308
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
NG Replace ABS MTR relay or TRC MTR relay.
OK
8 Check for short circuit in harness and connector between ABS MTR relay or TRC
MTR relay and skid control ECU (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
9 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
10 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 : 484
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