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DI-294
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6BQ-04
DTC C1246 / 46 Master Cylinder Pressure Sensor
Circuit
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
Any of the conditions 1. through 5. is detected:
1. At the vehicle speed of 7 km/h (4 mph) or more, ECU
terminal PMC voltage becomes more than 0.86 V and
the condition that 0.01 V or less does not change con-
tinues for 30 sec.
2. Interference occurs to ECU terminal PMC 7 times or
more in 5 sec.
3. ECU terminal STP is OFF, and the condition that termi- S Master cylinder pressure sensor
C1246 / 46
nal PMC voltage becomes more than 0.86 V or less than S Master cylinder pressure sensor circuit
0.3 V continues for 5 sec. or more.
4. The condition that ECU terminal IG1 voltage is 9.5 V to
17.0 V, and terminal VCM voltage is out of the range
from 4.4 V to 5.6 V continues for 1.2 sec. or more.
5. The condition that ECU terminal VCM voltage is 4.4 V to
5.6 V, and terminal PMC voltage is out of the range from
0.14 V to 4.85 V continues for 1.2 sec. or more.
WIRING DIAGRAM
M4 Skid Control ECU
Master Cylinder
Pressure Sensor
24
BR
V16 MSS
(Shielded)
23
R
E2 V16 E2
3
22
W
PMC V16 PMC
2
10
B
VCM V16 VCM
1
F14345
2002 4RUNNER (RM887U)
Author : Date : 470
DI-295
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
1 Check output value of master cylinder pressure sensor.
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:
Check that the brake fluid pressure value of the master cylinder pressure sensor displayed on the hand-held
tester is changing when the brake pedal is depressed.
OK:
Brake fluid pressure value must be changing.
OK Go to step 4.
NG
2 Check master cylinder pressure sensor.
PREPARATION:
Install LSPV gauge to the front caliper bleeder plug portion, and
bleed LSPV gauge.
PMC
SST 09709-29018
CHECK:
Start the engine and depress the brake pedal, then check the
E2 relation between the fluid pressure and voltage of PMC and E2
terminals of the master cylinder pressure sensor with the con-
F12700 nector still connected.
OK:
Front brake caliper fluid pressure Voltage
0 kPa (0 Kgf/cm2, 0 psi) 0.37 - 0.63 V
5,883 kPa (60 kgf/cm2, 853 psi) 1.57 - 1.83 V
11,768 kPa (120 kgf/cm2, 1,706 psi) 2.77 - 3.03 V
HINT:
Voltage of between terminals VCM and E2: 4.7 - 5.3 V
NG Replace master cylinder pressure sensor.
OK
2002 4RUNNER (RM887U)
Author : Date : 471
DI-296
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-28 ).
NG Repair or replace harness or connector.
OK
4 Check whether or not ECU terminal STP input voltage is changed when stop
light switch is turned on and off.
NO Check stop light switch circuit (See page
BE-40 ).
YES
Check and replace skid control ECU.
2002 4RUNNER (RM887U)
Author : Date : 472
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