cic13193.pdf

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05–1074
DIAGNOSTICS
–
ELECTRONICALLY CONTOROLLED BRAKE SYSTEM
05IZR–01
DTC
C1319/35
CHANGEOVER SOLENOID MALFUNCTION
CIRCUIT DESCRIPTION
The stroke simulator solenoid (SCSS) generates pedal reactive effort during ECB control. If one of the 4
wheels loses brake booster function, the stroke simulator operation is prohibited.
DTC No.
Detailed Code
DTC Detecting Condition
Trouble Area
SCSS drive circuit is malfunction-
ing for 0.05 sec. or more.
Short to +B in SCSS.
Stroke simulator
C1319/35
71
Skid control ECU
Harness and connector
Stroke simulator
Skid control ECU
Harness and connector
Current leaks for 0.05 sec. or
more when SCSS is off.
C1319/35
72
Stroke simulator
Skid control ECU
Open circuit in SCSS continues for
0.05 sec. or more.
C1319/35
73
Harness and connector
Stroke simulator
Skid control ECU
Harness and connector
Over current in SCSS continues
for 0.05 sec. or more.
C1319/35
74
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1238
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05–1075
DIAGNOSTICS
–
ELECTRONICALLY CONTOROLLED BRAKE SYSTEM
WIRING DIAGRAM
B17
Brake Master Stroke
Simulator Cylinder Assembly
A2
Brake Actuator
Skid Control ECU
Short Connector
2
2
BR
BR
BCSS
S2
S3
S7
SCSS
2
J1 J/C
1
1
P
P
B
BS1
BSR
S2
S3
S7
1
B
B
B
B
BS1
19
B
B
Engine Room R/B
B18
Brake Control Power Supply
ABS NO.1 Relay
J/C
7
A
C
Y
Y
Y
IN1
J8
J7
3
3
OUT
1
5
3
2
P
3
3
R1+
S7
2
1
12
L
SR1
S7
Driver Side J/B
Center Connector NO.2
ECU–IG
8
7
15
7
B
B
O
IG
IM1
5I
5H
1L
5
IG1 Relay
1
1B
5
3
Power Source
Control ECU
Center Connector NO.1
34
7
7
3
17
B
B
W–B
IG1D
P6
4J
4G
1J
1E
2
1
AM1
33
8
8
1
R
R
AM1
P6
4J
4G
1J
Engine Room R/B and J/B
DC/DC
1
1
1
W
B
B
3D
3M
BE1
2
1
5
ABS MAIN 3
L
L
BC
IN1
3
F15
FL Block
8
2
1
IH
Auxiliary Battery
1
MAIN
F47496
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1239
751526365.009.png
05–1076
DIAGNOSTICS
–
ELECTRONICALLY CONTOROLLED BRAKE SYSTEM
INSPECTION PROCEDURE
1
INSPECT BRAKE MASTER STROKE SIMULATOR CYLINDER ASSY
(a)
Disconnect brake master stroke simulator cylinder assy
connector.
Brake Master Stroke Simulator
Cylinder Assy
(b)
Measure the resistance according to the value(s) in the
table below.
Standard:
Tester Connection
Specified Condition
1 (BSR) – 2 (BCSS)
22.3 to 38 W
BCSS
BSR
NG
REPLACE
BRAKE
MASTER
STROKE
SIMULATOR CYLINDER ASSY
F47498
OK
2
INSPECT BRAKE MASTER STROKE SIMULATOR CYLINDER ASSY(BSR
TERMINAL VOLTAGE)
(a)
Connect the brake master stroke simulator cylinder assy
connector.
Brake Master Stroke Simulator
Cylinder Assy
(b)
Measure the voltage according to the value(s) in the table
below.
B18
HINT:
Measure the voltage from the behind the connector with the
connector connected.
Standard:
Tester Connection
BSR
Condition
Specified Condition
F47498
B17–1 (BSR) – Body
ground
Power switch ON
(READY)
10 to 14 V
NG
REPAIR
OR
REPLACE
HARNESS
OR
CONNECTOR
OK
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1240
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05–1077
DIAGNOSTICS
–
ELECTRONICALLY CONTOROLLED BRAKE SYSTEM
3
INSPECT SKID CONTROL ECU TERMINAL VOLTAGE(SCSS TERMINAL)
(a)
Connect the hand–held tester to the DLC3.
(b)
Select the ACTIVE TEST mode on the hand–held tester.
Item
Vehicle Condition / Test Details
Diagnostic Note
Operation of solenoid
(clicking sound) can be
heard
ACC PATTERN
Stroke simulator cut valve pattern activation ON / OFF
(c)
Using hand–held tester, turn the stroke simulator cylinder assy ON/OFF.
(d)
Measure the voltage according to the value(s) in the table
below.
Standard:
Tester Connection
Skid Control ECU
SCSS
Condition
Specified Condition
Brake Master Stroke
Simulator Cylinder assy
ON
S7–13 (SCSS) –
Body ground
Below 1.5 V
S7
Brake Master Stroke
Simulator Cylinder assy
OFF
S7–13 (SCSS) –
Body ground
10 to 14 V
F47485
NG
REPAIR
OR
REPLACE
HARNESS
OR
CONNECTOR
OK
REPLACE SKID CONTROL ECU ASSY (SEE PAGE 32–68 )
NOTICE:
When replacing the skid control ECU assy, perform initialization of linear solenoid valve and calibra-
tion (see page 05–958 ).
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
1241
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