2001 TOYOTA PRIUS relay

DI28U±10
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±363
2001 PRIUS (RM778U)
DIAGNOSTIC TROUBLE CODE CHART
NOTICE:
When removing the part, turn the ignition switch OFF.
HINT:

Using SST 09843±18040, connect the terminals Tc and CG of DLC3.

If any abnormality is not found when inspecting parts, inspect the ECU.

If a malfunction code is displayed during the DTC check, check the circuit listed that code. For details
of each code, turn to the page referred to under the ºSee pageº for respective ºDTC No.º in the DTC
chart.
DTC No.
(See Page)Detection ItemTrouble Area
C0200/31*1
(DI±366)Right front wheel speed sensor signal malfunction
C0205/32*1
(DI±366)Left front wheel speed sensor signal malfunction
Right front, left front, right rear and left rear speed sensor
Eh d i itC0210/33*1
(DI±366)Right rear wheel speed sensor signal malfunction

Each speed sensor circuit

Sensor rotor
C0215/34*1
(DI±366)Left rear wheel speed sensor signal malfunction
C0226/21
(DI±373)Malfunction in ABS solenoid (SFR) circuit
SFRR or SFRH circuit

Brake actuator
C0236/22
(DI±373)Malfunction in ABS solenoid (SFL) circuit
SFLR or SFLH circuit

Brake actuator
C0246/23
(DI±373)Malfunction in ABS solenoid (SR) circuit
SRR or SRH circuit

Brake actuator
C0278/11
(DI±376)Open circuit in ABS solenoid relay circuit
ABS solenoid relay
C0279/12
(DI±376)Short circuit in ABS solenoid relay circuit

ABS solenoid relay

ABS solenoid relay circuit
C1202/58
(DI±380)Brake fluid level low
Open circuit in brake fluid level warning switch circuit
Brake fluid level

Brake fluid level warning switch

Brake fluid level warning switch circuit
C1211/61
(DI±382)Malfunction in linear solenoid (SLA) circuit
SLA+ or SLA± circuit

Brake actuator
C1212/62
(DI±382)Malfunction in linear solenoid (SLR) circuit
SLR+ or SLR± circuit

Brake actuator
C1213/63
(DI±384)Malfunction in HV ECU communication circuit

HVI+ or HVI± circuit

HVO+ or HVO± circuit

HV ECU
C1214/64
(DI±386)Malfunction in hydraulic system

Each pressure sensor

Each pressure sensor circuit

Fluid leakage
C1215/15
(DI±387)Low positive voltage of linear solenoid
Battery
Ch i tC1216/16
(DI±387)High positive voltage of linear solenoid

Charging system

Power source circuit
C1217/25
(DI±373)Malfunction in regenerative solenoid (SMC1) circuit
Regenerative solenoid (SMC1) circuit

Brake actuator
C1218/26
(DI±373)Malfunction in regenerative solenoid (SMC2) circuit
Regenerative solenoid (SMC2) circuit

Brake actuator

DI±364
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U)C1219/27
(DI±373)
Malfunction in regenerative solenoid (SS) circuit
Regenerative solenoid (SS) circuit

Brake actuator
C1220/46
(DI±392)Malfunction in regulator (REG) pressure sensor
C1221/46
(DI±392)Malfunction in front (FR) pressure sensor

Each pressure sensor

Each pressure sensor circuit

Brake actuatorC1222/46
(DI±392)Malfunction in rear (RR) pressure sensor

Brake actuator
C1241/41
(DI±397)Low or abnormally high battery positive voltage in IG1 circuit

Battery

Charging system

Power source circuit
C1242/42*2
(DI±400)Open circuit in IG2 circuit

Battery

Charging system

Power source circuit
C1246/46
(DI±392)Malfunction in master cylinder (M/C) pressure sensor
Master cylinder (M/C) pressure sensor

Master cylinder (M/C) pressure sensor circuit
C1249/49
(DI±403)Open circuit in stop light switch circuit
Stop light switch

Stop light switch circuit
C1251/51*2
(DI±406)Malfunction in hydraulic brake booster pump motorHydraulic brake booster pump motor
C1252/52*2
(DI±409)Hydraulic brake booster pump motor ON time abnormally long

Hydraulic brake booster pump motor

Hydraulic brake booster pump motor circuit

Pressure switch (PH or PL)
C1253/53*2
(DI±416)Malfunction in hydro motor relay circuit
Hydro motor relay

Hydro motor relay circuit
C1254/54*2
(DI±421)Malfunction in pressure switch
Pressure switch (PH or PL)

Pressure switch circuit
C1256/56*2
(DI±424)Malfunction of accumulator low pressure

Accumulator

Pressure switch (PH or PL)

Hydraulic brake booster pump motor
C1257/57*2
(DI±430)Malfunction in power supply drive circuit
Battery

Power Source circuit
C1259/59
(DI±433)Malfunction in regenerative of HV ECU
HV control system

HV ECU
Always ON
(DI±434)Malfunction in brake ECU

Battery

Charging system

Power source circuit

Brake ECU
*1: As the DTC cannot be erased by replacing parts alone do either of the following operations.
(1) Clear DTC (See page DI±353).
(2) At the vehicle speed of 20 km/h (12 mph), drive the vehicle for 30 sec. or more.
*
2: Using the following table, troubled parts can be specified.

ECU
Power source* Hydraulic brake booster Motor relay circuit Accumulator malfunction
Pump motor circuit Pressure switchPH
PL
Pump motor
MTT wire harness
MT+ wire harness
MT± wire harness
MR1 open circuit
MR2 open circuit
MR1 welded contact
MR2 welded contact
Pressure leaks
IG2 open circuit
Power suplly circuit
Light Buzzer Light Light Light Light Light LightBuzzer Buzzer Buzzer Buzzer Buzzer Buzzer
DTC
BRAKE warning light and buzzerC1242/42
C1251/51 C1252/52 C1253/53C1254/54
C1256/56C1257/57
*: When IG1 circuit is open, ABS warning light and BRAKE warning light come on.




  
   






± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±365
2001 PRIUS (RM778U)
Table of Trouble Part and DTC:

DI±368
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U) MTT (B10 ± 27) ± GND (B10 ±
WLWBIG switch ON, pump motor rotatesAbove 8.0MTT (B10 27) GND (B10
6, 31, B11 ± 8, 17)W±L e W±BIG switch ON, pump motor stopsBelow 1.5
MT+ (B10 ± 28) ± GND (B10 ±
6, 31, B11 ± 8, 17)Y±G e W±BIG switch ON (Motor relay is OFF)Below 1.5
MR1 (B10 ± 29) ± GND (B10 ±
6, 31, B11 ± 8, 17)LG±R e W±BIG switch ON, ABS motor stops10 ± 14
STP (B11 ± 1) ± GND (B10 ± 6,GWWBStop light switch OFFBelow 1.5STP (B11 1) GND (B10 6,
31, B11 ± 8, 17)G±W e W±BStop light switch ON8 ± 14
SP1 (B11 ± 2) ± GND (B10 ± 6,
31, B11 ± 8, 17)V±R e W±BVehicle driving at about 30 km/h (19 mph)Pulse generation
Tc (B11 ± 3) ± GND (B10 ± 6,
31, B11 ± 8, 17)P±B e W±BIG switch ON10 ± 14
Ts (B11 ± 4) ± GND (B10 ± 6,
31, B11 ± 8, 17)GR±G e W±BIG switch ON10 ± 14
BRL (B11 ± 5) ± GND (B10 ± 6,
31, B11 ± 8, 17)R±Y e W±BIG switch OFF " ON (Parking brake switch OFF)10 ± 14 for about 3
sec., then Below 2
IG1 (B11 ± 6) ± GND (B10 ± 6,
31, B11 ± 8, 17)B±Y e W±BIG switch ON10 ± 14
R1+ (B11 ± 7) ± GND (B10 ± 6,
31, B11 ± 8, 17)Y±B e W±BIG switch ON10 ± 14
D/G (B11 ± 10) ± GND (B10 ±
6, 31, B11 ± 8, 17)W±L e W±BIG switch ON10 ± 14
RR+ (B11 ± 11) ± RR± (B11 ±
12)Y e BRIG switch ON, slowly turn right rear wheelPulse generation
HVO+ (B11 ± 14) ± GND (B10
± 6, 31, B11 ± 8, 17)G e W±BIG switch ONAbout 2.5
RLO (B11 ± 15) ± GND (B10 ±
6, 31, B11 ± 8, 17)W e W±BVehicle driving at about 30 km/h (19 mph)Pulse generation
HVI± (B11 ± 16) ± GND (B10 ±
6, 31, B11 ± 8, 17)V e W±BIG switch ONAbout 2.5
WA (B11 ± 18) ± GND (B10 ± 6,BWWBIG switch ON, ABS warning light ON10 ± 14WA (B11 18) GND (B10 6,
31, B11 ± 8, 17)B±W e W±BIG switch ON, ABS warning light OFFBelow 2.0
RL+ (B11 ± 19) ± RL± (B11 ±
20)P e LIG switch ON, slowly turn left rear wheelPulse generation
RSS (B11 ± 21) ± GND (B10 ±
6, 31, B11 ± 8, 17)BR±B e W±BIG switch OFFContinuity
HVO± (B11 ± 22) ± GND (B10 ±
6, 31, B11 ± 8, 17)R e W±BIG switch ONAbout 2.5
RRO (B11 ± 23) ± GND (B10 ±
6, 31, B11 ± 8, 17)B e W±BVehicle driving at about 30 km/h (19 mph)Pulse generation
HVI+ (B11 ± 24) ± GND (B10 ±
6, 31, B11 ± 8, 17)LG e W±BIG switch ONAbout 2.5
IG2 (B12 ± 1) ± GND (B10 ± 6,
31, B11 ± 8, 17)B±W e W±BIG switch ON10 ± 14
LBL (B12 ± 7) ± GND (B10 ± 6,
31, B11 ± 8, 17)LG±R e W±BIG switch ON, fluid in master cylinder reservoir above MIN level4.5 ± 6.4
VFR (B12 ± 9) ± GND (B10 ± 6,
31, B11 ± 8, 17)B e W±BIG switch ON4.5 ± 5.5
PKB (B12 ± 13) ± GND (B10 ±RYWBIG switch ON, parking brake switch ONBelow 1.5PKB (B12 13) GND (B10
6, 31, B11 ± 8, 17)R±Y e W±BIG switch ON, parking brake switch OFF10 ± 14

F12671
Brake ECU
SFRH
SFRR
SFLH
SFLR Engine Room
R/B No. 3
19
5 1121
4 W±R
2 1 4
3
7 14
IER1+
SR
8 W±B
F102
Brake Actuator 1
A
Battery10R±W
Y±B
G±W
G±O G±B
B39
32 5
12
R±Y ABS No. 1
BS
SFRR
SFLH
SFLR
SRRH
SRRR
SMC1
SS J1
J/C1
4 W
3 FL
Block
No. 1 2
1
B3 B3 B2
B3 B2 B3 B3B3B11 IA2
R±L R±G R±B SFRH
SMC2Y±B
Y±B
3
B10SRRH
SRRR
SMC1
SS SMC2 9
B10B10 B10B10 B10B10 B10B10 B10 B±L7
3
3
3
3 36
J7
J/C
W±B AA
B2 3
3Engine
Room
R/B No. 3
F131
1
B±G
1
FL
Block
No. 2ABS Solenoid Relay
R
DC/DC
MAIN
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±379
2001 PRIUS (RM778U)
WIRING DIAGRAM

F12672
Brake ECU
AST Engine Room R/B No. 3
ABS Solenoid
Relay 3 W
DC/DCW±R
Y±B
R1+
SR 14
W±BBrake Actuator FL
Block
No. 11
1
1ABS No. 1
F10
MAIN
BatteryA
A B±G
J7
J/CB±L
BS7
21
1
B±O 3
Engine Room
R/B No. 3
FL
Block
No. 2F13
A
IEJ1
J/C W±B
B10
B13 B11 B1
Brake
ECU 3
3 3
3 33
64
B2
B3 AST6 6
Y±B
19 2 1
R
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±381
2001 PRIUS (RM778U)
DTCC0278/11, C0279/12ABS Solenoid Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
C0278/11
When the terminal SR in brake ECU is 2 V or less, the ter-
minal AST in brake ECU continues to be in other than the
range from 10 ± 14 V for 0.2 sec. more.

ABS solenoid relay
C0279/12
When the voltage of the terminal SR in brake ECU is 10 ±
14 V, the terminal AST in brake ECU continues to be in the
range from 10 ± 14 V for 0.2 sec. more.

ABS solenoid relay

ABS solenoid relay circuit
WIRING DIAGRAM
DI290±08

F12662
LOCK
1 2
Engine Room R/B No. 3
DI±382
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U)
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 ABS solenoid relay operation.
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 ACTIVE TEST mode on the TOYOTA hand±held tester.
CHECK:
Check the operation sound of the ABS solenoid relay when operating it with the TOYOTA hand±held tester.
OK:
The operation sound of the ABS solenoid relay should be heard.
OK Go to step 4.
NG
2 Check voltage between terminals 1 and 2 of engine room R/B No. 3 (for ABS so-
lenoid relay).
PREPARATION:
Remove the ABS solenoid relay from engine room R/B No. 3.
CHECK:
Measure the voltage between terminals 1 and 2 of engine room
R/B No. 3 (for ABS solenoid relay).
OK:
Voltage: 10 ± 14 V
NG Check and repair harness or connector.
OK

F00042
1 34
6 Open
(+)(±)1 2 3
4
4 5 6
1 2
3
2 5 6
5 Continuity
ContinuityContinuity
Open
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±383
2001 PRIUS (RM778U)
3 Check ABS solenoid relay.
CHECK:
Check continuity between each terminal of ABS solenoid relay.
OK:
Terminals 4 and 6Continuity
(Reference value 80 W)
Terminals 2 and 3Continuity
Terminals 1 and 3Open
CHECK:
(a) Apply battery positive voltage between terminals 4 and 6.
(b) Check continuity between each terminal of ABS solenoid
relay.
OK:
Terminals 2 and 3Open
Terminals 1 and 3Continuity
NG Replace ABS solenoid relay.
OK