Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne di abswebdb cic12565
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DI-317
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6BW-08
DTC C1256 / 56 Accumulator Low Pressure Malfunc-
tion
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
Any of the conditions 1. through 5. is detected:
1. With the vehicle running and ABS, TRAC or VSC not in
operation, the pressure switch (PL) detects low pressure
for 1.4 sec. or more while the pressure switch (PH) de-
tects high pressure.
2. With the vehicle running and ABS, TRAC or VSC not in
operation, the pressure switch (PL) detects low pressure
for 0.2 sec. or more while the pressure switch (PH) de-
S Accumulator
tects high pressure.
C1256 / 56 S Pressure switch (PH or PL)
3. After the ignition switch is turned ON, the pressure
S Hydraulic brake booster pump motor
switch (PL) detects low pressure for 60 sec. or more.
4. With the vehicle running and after the ignition switch is
turned ON, the pressure switch (PL) remains ON while
ABS, TRAC or VSC does not operate for 1.4 sec. or
more.
5. With the vehicle running and after the ignition switch is
turned OFF, the pressure switch (PL) remains ON while
ABS, TRAC or VSC operates for 0.2 sec. or more.
2002 4RUNNER (RM887U)
Author : Date : 493
DI-318
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
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 2 5
1 2
L BM1
ABS MTR Relay V10
R BM1 2 4 8
5 +BM1 5 PLG Pressure PL L-W
1 2 V11 V11 V17 PL
Sensor (PL)
5 MR1 5
3 R1+ 4 6
GND2 Pressure PH
3
LG-B
11
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 : 494
DI-319
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Check accumulator operation.
PREPARATION:
(a) Turn the ignition switch OFF, and depress the brake pedal 40 times or more.
HINT:
When the pressure in the power supply system is released, reaction force becomes heavy and stroke be-
comes shorter.
(b) Install the LSPV gauge (SST) to the rear wheel cylinder and bleed air.
SST 09709-29018
CHECK:
Depress the brake pedal with force of more than 343 N (35 kgf, 77 lbf) and turn the ignition switch ON, then
check the rear wheel cylinder pressure when an increase of pressure changes from acutely to mildly.
OK:
5,099 - 8,924 kPa (52 - 91 kgf/cm2, 740 - 1,294 psi) at 20◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo