2001 TOYOTA PRIUS Service Repair Manual

A15566
72
65431
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
DI±355
2001 PRIUS (RM778U)
3 Check resistance of HV battery current sensor (In system main relay).
CHECK:
Using an ohmmeter, measure the resistance between terminals.
OK:
Standard resistance:
Terminal No. (Tester+)Terminal No. (Tester±)Resistance
6730 ± 50 kW
62More than 10 MW
7630 ± 50 kW
72More than 10 MW
26300 ± 400 kW
273 ± 5 MW
NG Replace the system main relay.
OK
Check fitting of connector S8 of system main
relay and correct if necessary.

DI7OJ±01
F12426
USA:
CANADA:
F09750
DLC3
CG Tc
DI±358
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U)
PRE±CHECK
1. PRECAUTION
(a) To distinguish trouble and repair it, perform necessary
electrical shock prevention operation (See page
IN±4).
(b) Some portions of the wiring harness belong to the 288 V
circuit, to which a high voltage is supplied. To avoid re-
ceiving an electrical shock, be sure to observe the follow-
ing:
(1) Wear insulating gloves during inspection.
(2) Before removing or installing parts and connectors,
remove the service plug and conform that the volt-
age at the output terminals has dropped down to 0
V.
(3) When disengaging wiring connectors, hold the con-
nector bodies to avoid pulling the wires. When en-
gaging wiring connectors, be sure to engage them
securely.
2. DIAGNOSIS SYSTEM
(a) Release the parking brake pedal.
(b) Check the indicator.
When the ignition switch is turned ON, check that the ABS
warning light and BRAKE warning light goes on for
approx. 3 seconds.
HINT:

When the parking brake is applied or the level of the brake
fluid is low, the BRAKE warning light is lit.

If the indicator check result is not normal, proceed to trou-
bleshooting for the ABS warning light circuit or BRAKE
warning light circuit (See page DI±437 or DI±441).
(c) Check the warning buzzer.
When depressing the brake pedal repeatedly it may turn
on the brake warning buzzer.
HINT:
If the warning buzzer check result is not normal, proceed to
troubleshooting for the brake warning buzzer circuit (See page
DI±444).
(d) In case of not using TOYOTA hand±held tester:
Check the DTC.
(1) Using SST, connect terminals Tc and CG of DLC3.
SST 09843±18040
(2) Turn the ignition switch ON.
(3) Read the DTC from the ABS warning light on the
combination meter.
HINT:

If no code appears, inspect the diagnostic circuit or ABS
warning light circuit (See page DI±437 or DI±447).

R01346
Normal Code
0.25 sec.
0.25 sec. 2 sec.
ON
OFF
ON
OFF0.5 sec. 0.5 sec.
Code 11 and 21
4 sec.1.5 sec.
2.5 sec.
Code 11 Code 21
F12396
TOYOTA
Hand±held Tester
DLC3
BR3890
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
DI±359
2001 PRIUS (RM778U)

As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(4) Codes are explained in the code table on page
DI±358.
(5) After completing the check, disconnect terminals Tc
and CG, and turn off the display.
If 2 or more malfunctions are indicated at the same time the low-
est numbered DTC will be displayed 1st.
(e) 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.
(f) In case of not using TOYOTA hand±held tester:
Clear the DTC.
(1) Using SST, connect terminals Tc and CG of DLC3.
SST 09843±18040
(2) Turn the ignition switch ON.
(3) Clear the DTC stored in ECU by depressing the
brake pedal 8 or more times within 5 seconds.
(4) Check that the warning light shows the normal
code.
(5) Remove the SST from the terminals of DLC3.
SST 09843±18040

F12396
TOYOTA
Hand±held Tester
DLC3
F09750
DLC3Tc
Ts
CG
BR3904
0.13 sec. 0.13 sec.
ON
OFF DI±360
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM WITH EBD & RBS
2001 PRIUS (RM778U)
(g) 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.
HINT:
Please refer to the TOYOTA hand±held tester operator's manu-
al for further details.
3. SENSOR SIGNAL CHECK (TEST MODE)
HINT:
If the ignition switch is turned from ON to ACC or LOCK during
test mode, DTC will be erased.
(a) In case of not using TOYOTA hand±held tester:
Check the sensor signal.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and CG of DLC3.
SST 09843±18040
(3) Start the engine.
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit and Ts terminal circuit (See page DI±437,
DI±449).
(5) Keep the vehicle in the stationary condition and the
brake pedal in free condition for 1 sec. or more.
(6) Keeping the vehicle in the stationary condition, de-
press the brake pedal with 98 N (10 kgf, 22 lbf) or
more for 1 sec. or more.
(7) Drive vehicle straight forward.
When driving the vehicle at the speed faster than 45
km/h (28 mph) for several seconds, check that the
ABS warning light comes off.
HINT:
There is a case that the sensor check is not completed if the ve-
hicle has its front wheels spun or its steering wheel steered dur-
ing this check.