TOYOTA PRIUS 2001 Service Repair Manual
Manufacturer: TOYOTA, Model Year: 2001, Model line: PRIUS, Model: TOYOTA PRIUS 2001Pages: 1943, PDF Size: 18.26 MB
Page 1031 of 1943
F09679
ON
DLC3 (+) (±)
Ts
CG
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±455
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and CG of DLC3.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals Ts and CG of DLC3.
OK:
Voltage: 10 ± 14 V
OK If ABS warning light does not blink even after Ts
and CG are connected, the ECU may be defec-
tive.
NG
2 Check for open and short circuit in harness and connector between brake ECU
and DLC3, DLC3 and body ground (See page IN±41).
NG Repair or replace harness or connector.
OK
Check and replace brake ECU.
Page 1032 of 1943
DI7QW±01
F12845
F12874
F12846
Tc
CG
F12873
WL
PGND
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
DI±459
2001 PRIUS (RM778U)
PRE±CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator.
When the ignition switch is turned ON, check that the PS
warning light goes on for 1.5 seconds.
HINT:
If the indicator check result is not normal, proceed to trou-
bleshooting for the PS warning light circuit (See page
DI±486).
When the EMPS system is faulty, the master warning light
in the combination meter and the PS warning light in the
multiinformation display lights up.
(b) In case of not using TOYOTA hand±held tester:
Check the DTC.
(1) Using SST, connect terminals Tc and CG of the
DLC3.
SST 09843±18040
(2) Remove the EMPS ECU with connector still con-
nected.
(3) Connect the both terminals of the 1kW resistance
and LED (Light Emitting Diode) circuit to terminals
WL and PGND of the EMPS ECU.
(4) Turn the ignition switch ON.
(5) Read the DTC from the PS warning light.
Page 1033 of 1943
F12870
Normal Code
0.25 sec.
0.25 sec.
ON
OFF
ON
OFF0.5 sec.
0.5 sec.
Codes 21 and 22
1.5 sec.2.5 sec.
Code 21Code 22
4 sec.0.5 sec.
F12396
TOYOTA
Hand±held Tester
DLC3
F12861
Ts
CG
DI±460
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
HINT:
If no code appears, inspect the diagnostic circuit and PS
warning light circuit (See page DI±491 or DI±486).
As an example, the blinking patterns for normal code and
codes 21 and 22 are shown on the left.
(6) Codes are explained in the DTC chart on page
DI±460.
(7) After completing the check, disconnect terminals Tc
and CG of the DLC3, and turn off the display.
If 2 or more malfunctions are indicated at the same
time, the lowest numbered DTC will be displayed
first.
(c) In case of using TOYOTA hand±held tester:
Check the DTC.
(1) Hook up the TOYOTA hand±held tester to the
DLC3.
(2) Turn the ignition switch ON.
(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.
(d) In case of not using TOYOTA hand±held tester:
Clear the DTC.
(1) Using SST, connect terminals Ts and CG of DLC3.
SST 09843±18040
(2) Turn the ignition switch ON.
(3) ON and OFF the terminal CG of the DLC3 4 times
or more within 8 seconds, delete DTC of the EMPS
ECU.
(4) Check that the PS warning light shows the normal
code.
(5) Remove the SST from the DLC3.
SST 09843±18040
Page 1034 of 1943
F12396
TOYOTA
Hand±held Tester
DLC3
F12848
Tc
CG
Ts
F12871
Malfunction Code (Example Code 72)
7
2
ON
OFF
0.5 sec. 0.5 sec.
0.5 sec.
1.5 sec.4 sec.
Repeat
0.5 sec. ON
OFF
0.25 sec.
0.25 sec. Normal Code
A Cycle
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
DI±461
2001 PRIUS (RM778U)
(e) In case of using TOYOTA hand±held tester:
Clear the DTC.
(1) Hook up the TOYOTA hand±held tester to the
DLC3.
(2) Turn the ignition switch ON.
(3) Operate the TOYOTA hand±held tester to erase the
codes. (See TOYOTA hand±held tester operator's
manual.)
2. INPUT SIGNAL CHECK (TEST MODE)
(a) In case of not using TOYOTA hand±held tester:
Check the input signal.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and CG of DLC3.
SST 09843±18040
(3) Check the warning light goes off with driving more
than 20 km/h (12 mph).
HINT:
If the warning light goes off during driving, the sensor can be
judged to normal.
(4) Stop the vehicle.
(5) Using SST, connect terminals Tc and CG of DLC3.
SST 09843±18040
(6) Read the number of blinks of the PS warning light.
HINT:
See the list of DTC shown on the next page.
Even a sensor is normal, it output codes 71 and 72 during
test mode.
(7) After doing check, disconnect the SST from the ter-
minals Ts and CG, Tc and CG of DLC3, and turn the
ignition switch OFF.
SST 09843±18040
Page 1035 of 1943
F12396
TOYOTA
Hand±held Tester
DLC3
DI±462
± DIAGNOSTICSELECTRIC MOTOR POWER STEERING
2001 PRIUS (RM778U)
(b) In case of using TOYOTA hand±held tester:
Check the input signal.
(1) Hook up the TOYOTA hand±held tester to the
DLC3.
(2) Check the warning light goes off with driving more
than 20 km/h (12 mph).
(3) Read the DTC by following the prompts on the tes-
ter screen.
HINT:
Please refer to the TOYOTA hand±held tester operator's
manual for further details.
See the list of DTC shown on the bottom of this page.
Even a sensor is normal, it output codes 71 and 72 during
test mode.
DTC of input signal check function:
Code No.
(See page)DiagnosisTrouble Area
C1515/15
(DI±468)Calibration of torque sensor zero point Not Performed±
C1516/16
(DI±469)Calibration of torque sensor zero point Not completed±
C1571/71
C1572/72
(DI±474)
Speed sensor malfunction (Test mode)
Right rear or left rear speed sensor
Sensor installation
Right rear or left rear speed sensor rotor
Right rear or left rear speed sensor circuit
Brake ECU
EMPS ECU
3. CALIBRATION OF TORQUE SENSOR ZERO POINT
HINT:
Perform this operation in the following cases.
When removing and installing ºsteering wheelº, ºtilt steer-
ing columnºand ºelectric power steering gearº.
When replacing EMPS ECU.
(a) Place front wheels and steering wheel facing straight
ahead.
(b) In case of 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.
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