TOYOTA PRIUS 2001 Service Repair Manual

BR3893
Malfunction Code (Example Code 72, 76)
72 67
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec.
2.5 sec.4 sec.
Repeat
F12396
TOYOTA
Hand±held Tester
DLC3
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±361
2001 PRIUS (RM778U)
(8) Stop the vehicle.
(9) Using SST, connect terminals Tc and CG of DLC3.
SST 09843±18040
(10) Read the number of blinks of the ABS warning light.
HINT:

See the list of DTC shown on the next page.

If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).

If 2 or more malfunctions are indicated at the same time,
the lowest numbered code will be displayed 1st.
(11) After doing the check, turn ignition switch OFF, and
disconnect the SST from terminals Ts and CG, Tc
and CG of DLC3.
SST 09843±18040
(b) In case of using TOYOTA hand±held tester:
Check the DTC.
(1) Hook up the TOYOTA hand±held tester to the
DLC3.
(2) Do step (3) to (8) on the previous page and this
page.
(3) Read the DTC by following the prompts on the tes-
ter screen.
HINT:
Please refer to the TOYOTA hand±held tester operator's manu-
al for further details.

DI±362
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U)
DTC of sensor check function:
Code No.DiagnosisTrouble Area
C1271/71Low output voltage of right front speed sensor

Right front speed sensor

Sensor installation

Right front speed sensor rotor
C1272/72Low output voltage of left front speed sensor

Left front speed sensor

Sensor installation

Left front speed sensor rotor
C1273/73Low output voltage of right rear speed sensor

Right rear speed sensor

Sensor installation

Right rear speed sensor rotor
C1274/74Low output voltage of left rear speed sensor

Left rear speed sensor

Sensor installation

Left rear speed sensor rotor
C1275/75Abnormal change in output voltage of right front speed sen-
sorRight front speed sensor rotor
C1276/76Abnormal change in output voltage of left front speed
sensorLeft front speed sensor rotor
C1277/77Abnormal change in output voltage of right rear speed
sensorRight rear speed sensor rotor
C1278/78Abnormal change in output voltage of left rear speed sensorLeft rear speed sensor rotor
C1281/81Master cylinder (M/C) pressure sensor output signals is
faultyMaster cylinder (M/C) pressure sensor
C1282/82Regulator (REG) pressure sensor output signal is faultyRegulator (REG) pressure sensor
C1283/83Front (FR) pressure sensor output signal is faultyFront (FR) pressure sensor
C1284/84Rear (RR) pressure sensor output signal is faultyRear (RR) pressure sensor

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:

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.

F12670
Brake ECU
A4
Speed Sensor
Front LH
P
L15 16
11 2 1 2
1
1
2
2 1FR+FL±
FR±
RR+ FL+
RR±RL+
RL± 5R
G
BR
14 B10
13
Y
BR19
20
B1112 (Shielded)
BR±B IB1

B11B11 B11 B11
RSS 21FSS 24 B10
B10
B10
B10
(Shielded)
(Shielded) (Shielded)
(Shielded)
(Shielded)P
L P
LIB1 IB1 2
1 A5
Speed Sensor
Front RH
A23
Speed Sensor
Rear LH
A24
Speed Sensor
Rear RH DI±372
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U)
WIRING DIAGRAM