2001 TOYOTA PRIUS Service Repair Manual

DI±222
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open and short in wire harness between park/neutral position switch
and HV ECU (See page IN±41).
Terminals for checking open and short:
Park/neutral Position Switch TerminalsHV ECU Terminals
2P
5N
6D
7B
4R
9VSFT
8SFT
3GSFT
NG Repair or replace wire harness.
OK
Check and repair park/neutral position switch (See page HT±54).

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±225
2001 PRIUS (RM778U)
DTC P3004 Power Cable Malfunction
CIRCUIT DESCRIPTION
If the inverter voltage is not decreased after discharge with the ignition switch OFF, the VM sensor in the
inverter is determined as defective.
HINT:

When using an OBD scan tool other than TOYOTA hand±held tester, check all the steps.

When using TOYOTA hand±held tester, confirm the information code and check it.
DTC P3004 ± Information code 130
INF. Code.Detecting ConditionTrouble Area
130When HV battery voltage becomes lower than inverter voltageConverter & inverter assembly
INSPECTION PROCEDURE
1 Are there any other codes of HV ECU being outputs?
YES Go to relevant DTC chart.
NO
Replace converter & inverter assembly.
DI82X±02

DI±226
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
DTC P3004 ± Information code 131
INF. Code.Detecting ConditionTrouble Area
131
When condition (a), (b) or (c) is detected:
(d) Main fuse blown out
(e) Service plug disconnected
(f) Limiter resistance cut off
Service plug

Power cable

System main relay
INSPECTION PROCEDURE
1 Is DTC of battery ECU being output?
YES Check the applicable DTC.
NO
2 Check condition of service plug terminal (Loosened, poor contact, etc.).
NG Replace service plug.
OK
3 Check continuity of power cable.
OK:
Continuity :Less than 1 W
NG Replace the power cable.
OK
Replace the system main relay.

A15179
BA
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±227
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
DTC P3004 ± Information code 132
INF. Code.Detecting ConditionTrouble Area
132When inverter voltage sensor is malfunctioning or limiter resis-
tance value increases.
Converter & inverter assembly

Power cable

System main relay
INSPECTION PROCEDURE
1 Are other information codes recorded?
YES Check applicable information code (See page
DI±197).
NO
2 Check continuity of limiter resistance in system main relay.
PREPARATION:
Remove the system main relay.
CHECK:
(a) Apply battery voltage across terminals 1 and 3.
(b) Using an ohmmeter, check that there is continuity be-
tween terminals A and B.
OK:
Continuity
NG Replace the system main relay.
OK
Check continuity and replace power cable.

DI±228
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU gives warning to the driver and performs the fail safe control, according to the abnormal signal
received from the battery ECU.
DTC P3004 ± Information code 133
INF. Code.Detecting ConditionTrouble Area
133Input of abnormal signal from battery ECU
HV battery system
INSPECTION PROCEDURE
If the information code 133 output, after confirming the DTC of the HV Battery ECU, check and repair the
applicable DTC. After repairing it, record the DTC of the HV ECU, freeze frame data and history of operation.
Then, clear the DTC and check it one more time after starting the system again (ºREADYº light ON).

A14150
H12Hybrid Vehicle
Control ECU
10 21
GO G 9
IA2 G
E9 GO ECM
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±229
2001 PRIUS (RM778U)
DTC P3100 HV ECU Malfunction
CIRCUIT DESCRIPTION
The HV ECU compares Ne signal with G signal that are sent from the ECM and checks whether the engine
rpm signal is correct or not.
HINT:

When using an OBD scan tool other than TOYOTA hand±held tester, check all the steps.

When using TOYOTA hand±held tester, confirm the information code and check it.
DTC P3100 ± Information code 136, 137
INF. Code.Detecting ConditionTrouble Area
136Open or short in GO signal circuit
Wire harness

ECM
137Engine speed sensor malfunction

ECM

Crankshaft position sensor

Camshaft position sensor
WIRING DIAGRAM
DI82Y±02