2001 TOYOTA PRIUS Service Repair Manual

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