Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 abswebdb cic12465
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DI-31 1
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI8AW-01
DTC C1246 / 53 Master Cylinder Pressure Sensor Circuit
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
When any of the following 1. through 3. is detected:
1. The voltage of sensor signal is out of range (less than
S Master cylinder pressure sensor
0.25 V, more than 4.75 V).
C1246 / 53 S Master cylinder pressure sensor circuit
2. The sensor supply voltage is out of range (above 5.6 V,
S Stop light switch circuit
below 4.4 V).
3. The sensor signal offset value is out of range.
WIRING DIAGRAM
M4 Master Cylinder
Pressure Sensor Skid Control ECU
7
3 R-W VCM
VCM V14
8
2 R-L
PMC V14 PMC
9
1 BR-Y
E2 V14 E2
F13456
2001 SIENNA (RM787U)
Author : Date : 465
DI-312
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the TOYOTA hand-held tester and start from step 2 in case
of not using the TOYOTA hand-held tester.
1 Check output value of the master cylinder pressure sensor.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the DATALIST mode on the TOYOTA hand-held tester.
CHECK:
Check that the brake fluid pressure value of the master cylinder pressure sensor displayed on the TOYOTA
hand-held tester is changing when depressing the brake pedal.
OK:
Brake fluid pressure value must be changing.
Voltage: 0.25 - 4.75 V
OK Go to step 4.
NG
2 Check master cylinder pressure sensor.
PREPARATION:
E2
Install LSPV gauge to the front caliper bleeder plug portion, and
PMC
bleed the air from LSPV gauge.
SST 09709-29018
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 master cylinder pressure sensor with connector
F13424 still connected.
OK:
Front brake caliper fluid pressure Voltage
0 kPa (0 Kgf/cm2, 0 psi) 0.44 - 0.76 V
5,883 kPa (60 kgf/cm2, 853 psi) 1.34 - 1.66 V
11,768 kPa (120 kgf/cm2, 1,706 psi) 2.24 - 2.56 V
HINT:
Voltage between terminals VCM and E2: 4.7 - 5.3 V
NG Replace master cylinder pressure sensor.
OK
2001 SIENNA (RM787U)
Author : Date : 466
DI-313
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
3 Check for open and short circuit in harness and connector between master cyl-
inder pressure sensor and skid control ECU (See page IN-31 ).
NG Repair or replace harness or connector.
OK
4 Check voltage between terminal STP (48) of skid control ECU and body ground
when the brake pedal is depressed and released.
PREPARATION:
48
Disconnect the connector from the skid control ECU.
CHECK:
Measure the voltage between terminal 48 of skid control ECU
harness side connector and body ground when the brake pedal
is depressed and released.
OK:
Brake pedal Voltage
F07897
depressed (Measure cylinder pressure valve y 1.5 Mpa) 7.5 - 14 V
released below 2.0 V
NG Check the stop light switch circuit (See page
BE-35 ) and stop light switch.
OK
Check and replace skid control ECU.
2001 SIENNA (RM787U)
Author : Date : 467
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