2001 TOYOTA PRIUS Service Repair Manual

F12676
B±G
F101
3 Engine Room R/B No. 3
DC/DC FL Block No. 1
7Brake ECU
L W22
+BS
B13
8 ABS No. 4
1
F13
Battery2
B3 1
8 1
7 B3
B3
B3B13
B13
B13 B13
LG
P
V1
16 L
3
1
2
FL
Block
No. 2
Brake ActuatorSLA+
SLA±
SLR+
SLR± MAIN DI±392
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U)
DTCC1215/15, C1216/16 Linear Solenoid Positive Voltage Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1215/15
When any of the following 1. or 2. is detected:
1. When the ignition switch is ON, the condition that the
voltage of the terminal +BS in brake ECU is 2.5 V or
less continues for 0.5 sec. or more.
2. While a vehicle is driven at a speed of 3 km/h (5 mph) or
more, the condition that the voltage of the terminal +BS
in brake ECU is 9 V or less continues for 10 sec. or
more.

Battery

Charging system

Power source circuit
C1216/16
When the ignition switch is ON, the condition that the volt-
age of the terminal +BS in brake ECU is 17 V or more con-
tinues for 1.2 sec. or more.
WIRING DIAGRAM
DI7ON±01

F12445
Engine Room R/B No. 3
ABS No. 4
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±393
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check ABS No. 4 fuse.
PREPARATION:
Remove the ABS No. 4 fuse from engine room R/B No. 3.
CHECK:
Check continuity of ABS No. 4 fuse.
OK:
Continuity
NG Check for short circuit in all the harness and
components connected to ABS No. 4 fuse (See
attached wiring diagram).
OK
2 Check battery positive voltage.
OK:
Voltage: 10 ± 14 V
NG Check and repair the charging system (See
page HV±39).
OK

F10937
GND+BS
DI±394
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U)
3 Check voltage of the ECU +BS power source.
In case of using the TOYOTA hand±held tester:
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 the voltage condition output from the ECU displayed on the TOYOTA hand±held tester.
OK:
ºNormalº is displayed.
In case of not using TOYOTA hand±held tester:
PREPARATION:
Remove the ABS ECU with connectors still connected.
CHECK:
Measure voltage between terminals +BS and GND of ABS ECU
connector.
OK:
Voltage: 10 ± 14 V
OK Check and replace brake ECU.
NG
4 Check for open circuit (to +BS) in harness and connector between brake ECU
and battery (See page IN±41).
NG Repair or replace harness or connector.
OK

F12406
LOCK
GNDB11
B10
F10936
SLA+
SLR+
SLR±
SLA±
B3
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±395
2001 PRIUS (RM778U)
5 Check continuity between terminal GND of brake ECU connector and body
ground.
PREPARATION:
Disconnect the 2 connectors (B10, B11) from the brake ECU.
CHECK:
Measure resistance between terminals GND of brake ECU har-
ness side connector and body ground.
OK:
Resistance: 1 W or less
NG Repair or replace harness or connector.
OK
6 Check brake actuator solenoid.
PREPARATION:
Disconnect the connector (B3) from the brake actuator.
CHECK:
Check continuity between each of terminals SLA+ and SLA±,
and terminals SLR+ and SLR± of brake actuator.
OK:
Continuity
HINT:
Resistance of each solenoid approx. 2.3 W at 20 °C (68 °F).
NG Replace brake actuator.
OK