2001 TOYOTA PRIUS ABS

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

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:

DI1GG±06
F02094
B13 B12
B11 B10
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±367
2001 PRIUS (RM778U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
SFRH (B10 ± 1) ± GND (B10 ±
6, 31, B11 ± 8, 17)R±B e W±BIG switch ON, ABS warning light OFF10 ± 14
SFRR (B10 ± 2) ± GND (B10 ±
6, 31, B11 ± 8, 17)R±W e W±BIG switch ON, ABS warning light OFF10 ± 14
SMC2 (B10 ± 3) ± GND (B10 ±
6, 31, B11 ± 8, 17)G±B e W±BIG switch ON, ABS warning light OFF (Brake pedal released)10 ± 14
SMC1 (B10 ± 4) ± GND (B10 ±
6, 31, B11 ± 8, 17)G±W e W±BIG switch ON, ABS warning light OFF (Brake pedal released)10 ± 14
SS (B10 ± 5) ± GND (B10 ± 6,
31, B11 ± 8, 17)G±O e W±BIG switch ON, ABS warning light OFF (Brake pedal released)10 ± 14
SFLR (B10 ± 7) ± GND (B10 ±
6, 31, B11 ± 8, 17)R±G e W±BIG switch ON, ABS warning light OFF10 ± 14
SRRH (B10 ± 8) ± GND (B10 ±
6, 31, B11 ± 8, 17)R±Ye W±BIG switch ON, ABS warning light OFF10 ± 14
SRRR (B10 ± 9) ± GND (B10 ±
6, 31, B11 ± 8, 17)R±L e W±BIG switch ON, ABS warning light OFF10 ± 14
VCM (B10 ± 10) ± GND (B10 ±
6, 31, B11 ± 8, 17)B e W±BIG switch ON4.5 ± 5.5
PH (B10 ± 11) ± GND (B10 ± 6,GRWBVehicle stops, pump motor rotates5 ± 7PH (B10 11 ) GND (B10 6,
31, B11 ± 8, 17)GR eW±BVehicle stops, pump motor stopsBelow 1.0
SG1 (B10 ± 12) ± GND (B10 ±
6, 31, B11 ± 8, 17)Shielded eW±BIG switch OFFContinuity
FR+ (B10 ± 14) ± FR± (B10 ±
13)P e LIG switch ON, slowly turn right front wheelPulse generation
FL+ (B10 ± 16) ± FL± (B10 ±
15)R e GIG switch ON, slowly turn left front wheelPulse generation
MT± (B10 ± 18) ± GND (B10 ±
6, 31, B11 ± 8, 17)Y e W±BIG switch OFFContinuity
SR (B10 ± 19) ± GND (B10 ± 6,
31, B11 ± 8, 17)B±L e W±BIG switch ON, ABS warning light OFFBelow 1.5
SFLH (B10 ± 21) ± GND (B10 ±
6, 31, B11 ± 8, 17)Y±B e W±BIG switch ON, ABS warning light OFF10 ± 14
PMC (B10 ± 22) ± GND (B10 ±
6, 31, B11 ± 8, 17)W e W±BIG switch ON, stop light switch OFFBelow 1.0
E2 (B10 ± 23) ± GND (B10 ± 6,
31, B11 ± 8, 17)R e W±BIG switch OFFContinuity
FSS (B10 ± 24) ± GND (B10 ±
6, 31, B11 ± 8, 17)BR e W±BIG switch OFFContinuity

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

± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±369
2001 PRIUS (RM778U) SG2 (B12 ± 15) ± GND (B10 ±
6, 31, B11 ± 8, 17)
Shielded e W±BIG switch OFFContinuity
VREG (B12 ± 16) ± GND (B10
± 6, 31, B11 ± 8, 17)B e W±BIG switch ON4.5 ± 5.5
SG3 (B12 ± 18) ± GND (B10 ±
6, 31, B11 ± 8, 17)Shielded e W±BIG switch OFFContinuity
BZ (B12 ± 20) ± GND (B10 ± 6,GWBIG switch ON, buzzer soundsBelow 1.5BZ (B12 20) GND (B10 6,
31, B11 ± 8, 17)G e W±BIG switch ON, buzzer does not sound10 ± 14
EREG (B12 ± 24) ± GND (B10
± 6, 31, B11 ± 8, 17)R e W±BIG switch OFFContinuity
PREG (B12 ± 25) ± GND (B10
± 6, 31, B11 ± 8, 17)W e W±BIG switch ON, brake pedal releasedBelow 1.0
EFR (B12 ± 27) ± GND (B10 ±
6, 31, B11 ± 8, 17)R e W±BIG switch OFFContinuity
PFR (B12 ± 28) ± GND (B10 ±
6, 31, B11 ± 8, 17)W e W±BIG switch ON, brake pedal releasedBelow 1.0
SLA+ (B13 ± 1) ± GND (B10 ±
6, 31, B11 ± 8, 17)L e W±BIG switch ONPulse generation
MR2 (B13 ± 2) ± GND (B10 ± 6,YGWBIG switch ON, pump motor rotatesBelow 1.0MR2 (B13 2) GND (B10 6,
31, B11 ± 8, 17)Y±G e W±BIG switch ON, pump motor stops10 ±14
R2+ (B13 ± 3) ± GND (B10 ± 6,
31, B11 ± 8, 17)L±O e W±BIG switch ON10 ± 14
VRR (B13 ± 5) ± GND (B10 ± 6,
31, B11 ± 8, 17)B e W±BIG switch ON4.5 ± 5.5
AST (B13 ± 6) ± GND (B10 ± 6,
31, B11 ± 8, 17)B±O e W±BIG switch ON, ABS warning light OFF10 ± 14
SLR± (B13 ± 7) ± GND (B10 ±
6, 31, B11 ± 8, 17)V e W±BIG switch ONBelow 1.5
SLA± (B13 ± 8) ± GND (B10 ±
6, 31, B11 ± 8, 17)LG e W±BIG switch ONBelow 1.5
PL (B13 ± 9) ± GND (B10 ± 6,
31, B11 ± 8, 17)Y±R e W±BIG switch OFF, depress brake pedal more than 40 times " IG
switch ON6.5 ± 10 " 2.5 ± 5.0
PRR (B13 ± 13) ± GND (B10 ±
6, 31, B11 ± 8, 17)W e W±BIG switch ON, brake pedal releasedBelow 1.0
SLR+ (B13 ± 16) ± GND (B10 ±
6, 31, B11 ± 8, 17)P e W±BIG switch ONPulse generation
SG4 (B13 ± 19) ± GND (B10 ±
6, 31, B11 ± 8, 17)Shielded e W±BIG switch OFFContinuity
ERR (B13 ± 20) ± GND (B10 ±
6, 31, B11 ± 8, 17)R e W±BIG switch OFFContinuity
+BS (B13 ± 22) ± GND (B10 ±
6, 31, B11 ± 8, 17)Le W±BIG switch ON10 ± 14

DI7OK±01
BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
±VHigh Speed
Low Speed
CoilNS
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±371
2001 PRIUS (RM778U)
CIRCUIT INSPECTION
DTC
C0200/31 ± C0215/34Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used for control
of both the ABS & EBD control system. The front and rear rotors
each have 48 serrations.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.

DTC No.DTC Detecting ConditionTrouble Area
C0200/31
C0205/32
C0210/33
C0215/34
Detection of any of conditions 1. through 4.:
1. At vehicle speed of 10 km/h (6 mph) or more, pulses are
not input for 15 sec. or more.
2. While a vehicle is driven at a speed of 15 km/h (24 mph)
or more, pulse signals from the speed sensor are
instantly omitted 7 times or more.
3. While a vehicle is driven at a speed of 20 km/h (32 mph)
or more, error signals from the speed sensor are trans-
mitted consecutively 75 time or more within 5 min.
4. When the ignition switch is ON, an open circuit in the
speed sensor continues for 0.5 sec. or more.

Right front, left front, right rear and left rear speed sensor

Each speed sensor circuit

Sensor rotor
HINT:
DTC No. C0200/31 is for the right front speed sensor.
DTC No. C0205/32 is for the left front speed sensor.
DTC No. C0210/33 is for the right rear speed sensor.
DTC No. C0215/34 is for the left rear speed sensor.

DI±378
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U)
DTCC0226/21 ± C0246/23ABS Solenoid Circuit
DTC
C1217/25 ± C1219/27Regenerative Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders thus controlling the braking force.
DTC No.DTC Detecting ConditionTrouble Area
C0226/21Open or short circuit in SFRH or SFRR circuit continues for
0.05 sec. or more.
SFRH or SFRR circuit

Brake actuator
C0236/22Open or short circuit in SFLH or SFLR circuit continues for
0.05 sec. or more.
SFLH or SFLR circuit

Brake actuator
C0246/23Open or short circuit in SRR or SRH circuit continues for
0.05 sec. or more.
SRR or SRH circuit

Brake actuator
C1217/25Open or short circuit in SMC1 circuit continues for 0.05 sec.
or more.
SMC1 circuit

Brake actuator
C1218/26Open or short circuit in SMC2 circuit continues for 0.05 sec.
or more.
SMC2 circuit

Brake actuator
C1219/27Open or short circuit in SS circuit continues for 0.05 sec. or
more.
SS circuit

Brake actuator
DI28Z±13

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