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DI-314
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6BV-08
DTC C1254 / 54 Pressure Switch Circuit
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, short or open
circuit in pressure switch (PL) continues for more than 1 S Pressure switch (PH or PL)
C1254 / 54
sec. S Pressure switch circuit
2. After the ignition switch is turned ON, open circuit in
pressure switch (PH) continues for more than 1 sec.
WIRING DIAGRAM
Skid Control ECU
1
R-B
V16 R1+
2
Y-B
V17 R2+
VSC R/B
P-B 1
TRC MTR Relay V17 MR2
R2+ Hydraulic Brake Booster
5 MR2 5 3
3 4 W BM2
+BM2 V11
R
5 BM2 5
1 2 2
L BM1
ABS MTR Relay V10
R BM1 2 4 8
5 5 PLG L-W
1 +BM1 2 V11
Pressure PL
V11 V17 PL
Sensor (PL)
MR1
5 R1+ 5 6 3 11
3 4 GND2 Pressure PH LG-B
V11 Sensor (PH) V10 V16 PH
F13 Fuse Box 7 27
MTT P-B
R ABS2 W-R V11 V16 MMT
1 2 5 28
PHG
MT+ GR
Engine Room J/B V10 V11 V16 MT+
5
8 18
W MT- O
2 2 W-B V10 V11 V16 MT-
1 GND1 29
L-B
V16 MR-
W-B A A
W-B W-B
J2 J1
Battery EA A EB
W-B
J2
J/C
F14349
2002 4RUNNER (RM887U)
Author : Date : 490
DI-315
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Check pressure switch (PL) resistance.
PREPARATION:
PL
(a) Disconnect the connector (V11) from the hydraulic brake
booster.
LOCK V11
(b) With the ignition switch OFF, depress the brake pedal
more than 40 times to decrease the accumulator pres-
PLG
sure.
HINT:
When the pressure in power supply system is released, reac-
F09987 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: 5.1 - 6.3 k
HINT:
After inspection, connect the connector and clear the DTC (See
page DI-224 ).
NG Replace hydraulic brake booster assembly.
OK
2 Check pressure switch (PH) resistance.
PREPARATION:
(a) Disconnect the connector (V10) from the hydraulic brake
LOCK booster.
(b) With the ignition switch OFF, depress the brake pedal
PH more than 40 times to decrease the accumulator pres-
sure.
HINT:
When the pressure in power supply system is released, reac-
PHG V10
F06043 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: 0.9 - 1.1 k
HINT:
After inspection, connect the connector and clear the DTC (See
page DI-224 ).
2002 4RUNNER (RM887U)
Author : Date : 491
DI-316
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
NG Replace hydraulic brake booster assembly.
OK
3 Check for open and short circuit in harness and connector between pressure
switch and skid control ECU (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
2002 4RUNNER (RM887U)
Author : Date : 492
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