power steering TOYOTA PRIUS 2001 Service Owner's Guide
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 2001, Model line: PRIUS, Model: TOYOTA PRIUS 2001Pages: 1943, PDF Size: 18.26 MB
Page 1036 of 1943
F12396
TOYOTA
Hand±held Tester
DLC3
F12827
Tc
CG
Ts
F12864
Tc
CG
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
DI±463
2001 PRIUS (RM778U)
(2) Hook up the TOYOTA hand±held tester to the
DLC3.
(3) Select the ºTRQ SENS ADJUSTº mode on the TOY-
OTA hand±held tester.
(4) Select the ºZERO POINT INITIALIZEº.
(5) Following the screen instructions, perform the
torque sensor zero point initialization.
HINT:
Please refer to the TOYOTA hand±held tester operator's manu-
al for further details.
(c) In case of not using TOYOTA hand±held tester:
Perform the torque sensor zero point initialization.
HINT:
If the EMPS ECU is replaced, however, this operation is not
necessary.
(1) Stop the vehicle.
(2) Using SST, connect terminals Ts and CG of DLC3.
SST 09843±18040
(3) Using SST, connect terminals Tc and CG of DLC3.
SST 09843±18040
(4) ON and OFF the terminal Tc of DLC3 20 times within
20 sedonds.
(5) Check that the DTC C1515/15.
(d) In case of using TOYOTA hand±held tester:
Perform the torque sensor zero point calibration.
HINT:
Don't touch the steering wheel.
(1) Select the ºTRQ SENS ADJUSTº mode on the TOY-
OTA hand±held tester.
(2) Select the ºZERO POINT ADJUSTº.
(3) Following the screen instructions, perform the
torque sensor zero point calibration.
HINT:
Please refer to the TOYOTA hand±held tester operator's manu-
al for further details.
(e) In case of not using TOYOTA hand±held tester:
Perform the torque sensor zero point calibration.
HINT:
Don't touch the steering wheel.
Check the DTC except C1515/15 is not output.
(1) Stop the vehicle and turn the ignition switch OFF.
Page 1037 of 1943
F12848
CG
Ts
DI±464
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
(2) Using SST, connect terminals Ts and CG of DLC3
and ignition switch ON.
SST 09843±18040
(3) Disconnect the SST.
SST 09843±18040
Page 1038 of 1943
DI7QX±01
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
DI±465
2001 PRIUS (RM778U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843±18040, connect terminals Tc and CG of the DLC3.
If a malfunction code is displayed during the DTC check, check the circuit listed for the 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
C1511/11
(DI±465)
C1512/12
(DI±465)
T i it lf tiTorque sensor
C1513/13
(DI±465)Torque sensor circuit malfunctionTorque sensor
EMPS ECU
C1514/14
(DI±465)
C1521/21
(DI±471)
C1522/22
(DI±471)
Mt i it lf tiPower steering gear assembly with motor
C1523/23
(DI±471)Motor circuit malfunctionPower steering gear assembly with motor
EMPS ECU
C1524/24
(DI±471)
C1531/31
(DI±473)
C1532/32
(DI±473)EMPS ECU malfunctionEMPS ECU
C1533/33
(DI±473)
C1541/41
(DI±474)
C1542/42
(DI±474)Speed sensor malfunction
Speed sensor
Brake ECU
EMPS ECUC1543/43
(DI±474)EMPS ECU
C1551/51
(DI±476)IG power source circuit malfunction
EMPS ECU
Power source circuit
Charging system
C1552/52
(DI±479)PIG power source drop voltage malfunctionEMPS ECU
Power source circuit
C1553/53
(DI±482)When resetting voltage, vehicle is being drivenEMPS ECU
C1554/54
(DI±483)EMPS relay circuit malfunction
EMPS relay
EMPS ECU
EMPS relay circuit
C1555/55
(DI±473)EMPS ECU malfunctionEMPS ECU
C1556/56
(DI±486)P/S warning light circuitMultiinformation display
EMPS ECU
Page 1039 of 1943
DI±466
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)C1557/57
(DI±488)
Memory of overheat prevention control±
C1558/58
(DI±488)Memory of voltage drop at motor power supply±
C1559/59
(DI±488)Memory of continuous control under high load±
Always ON
(DI±489)Malfunction in EMPS ECU
Power source circuit
EMPS ECU
PS warning light circuit
Page 1040 of 1943
DI7R1±01
F12832
I01
E3
E3
E3
E31
4
2
3EMPS ECU
TRQV
TRQ1
TRQ2
TRQG (Shielded)
W
R
G
B 1 2
3
4 VCC
VT1
VT2
GND Steering Shaft
Torque Sensor
W±B 5
J/C
J18 J19AA
W±B W±B
J17 J/C
A
IG DI±470
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
CIRCUIT INSPECTION
DTC
C1511/11±C1514/14Torque Sensor Circuit Malfunction
CIRCUIT DESCRIPTION
Steering torque is detected from output current of torque sensor.
DTC No.Detection ItemTrouble Area
C1511/11
C1512/12Torque sensor malfunctionPower steering gear assembly with motor
C1513/13
Torque sensor malfunctionPower steering gear assembly with motor
EMPS ECU
C1514/14Open or short torque sensor circuit
WIRING DIAGRAM
Page 1041 of 1943
F12270
ON
TRQV
TRQG
F12271
VT1
VT2
GND
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
DI±471
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check voltage between terminals TRQV and TRQG of EMPS ECU.
PREPARATION:
Remove the EMPS ECU with connectors still connected.
CHECK:
Measure the voltage between terminals TRQV and TRQG of
EMPS ECU connector.
OK:
Voltage: 4.5 ± 5.5 V
NG Check and replace the EMPS ECU.
OK
2 Check for open and short circuit in harness and connector between terminals
TRQV and TRQG of EMPS ECU connector (See page IN±41).
NG Repair and replace harness or connector.
OK
3 Check voltage between terminals VT1 and GND, VT2 and GND of torque sensor
connector.
PREPARATION:
Remove the torque sensor with connectors still connected.
CHECK:
Measure the voltage between terminals VT1 and GND, VT2 and
GND of torque sensor connector.
OK:
Steering PositionVT1VT2
Center position2.1 ± 2.9 V2.1 ± 2.9 V
Right turned0.15 ± 2.9 V2.1 ± 4.85 V
Left turned2.1 ± 4.85 V0.15 ± 2.9 V
Page 1042 of 1943
DI±472
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
NG Check and replace power steering gear assem-
bly with motor (See page SR±17).
OK
4 Check for open and short circuit in harness and connector between terminals
VT
1 of torque sensor connector and TRQ1 of EMPS ECU connector, VT2 of torque
sensor connector and TRQ
2 of EMPS ECU connector (See page IN±41).
NG Repair and replace harness or connector.
OK
Check and replace EMPS ECU.
Page 1043 of 1943
DI±474
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
DTC C1516/16 Calibration of Torque Sensor Zero Point Not
Completed
CIRCUIT DESCRIPTION
This DTC does not indicated trouble. This is detected when the torque sensor zero point calibration is not
completed normally.
DTC No.DTC Detecting ConditionTrouble Area
C1516/16This is detected when the torque sensor zero point calibra-
tion is not completed normally.±
INSPECTION PROCEDURE
1 Perform calibration of torque sensor zero point (See page DI±454).
2 Is DTC C1516/16 output?
Check DTC on page DI±460.
NO No problem.
YES
3 Is DTC C1532/32 output?
YES Check and replace EMPS ECU.
NO
4 Perform calibration of torque sensor zero point again (See page DI±454).
DI7R3±01
Page 1044 of 1943
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
DI±475
2001 PRIUS (RM778U)
5 Is DTC C1516/16 output after attempted 3 times or more?
YES Replace the power steering gear assembly with
motor.
NO
No problem.
Page 1045 of 1943
F12834
2
1DC Motor1
2
E4 E4 M1
M2EMPS ECU
B±YY
F12819
ON
M1
M2
DI±476
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
DTCC1521/21±C1524/24Motor Circuit Malfunction
CIRCUIT DESCRIPTION
DTC No.Detection ItemTrouble Area
C1521/21
C1522/22Short circuit of motor terminal or abnormal voltage or current inPower steering gear assembly with motor
C1523/23
Short circuit of motor terminal or abnormal voltage or current in
motor circuit.
Power steering gear assembly with motor
EMPS ECU
C1524/24
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals M1 and M2 of EMPS ECU connector.
PREPARATION:
Remove the EMPS ECU with connectors still connected.
Turn the ignition switch ON.
CHECK:
Turn the steering wheel to left and right and measure the volt-
age between terminals M
1 and M2 of EMPS ECU connector.
OK:
Voltage: 9 ± 14 V
NG Check and replace the EMPS ECU.
DI7R4±01