TOYOTA PRIUS 2001 Service Repair Manual

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

DI±230
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Is DTC of ECM being output (See page DI±1)?
Yes Check applicable DTC (See page DI±1).
NO
2 Check for open and short in wire harness between GO terminal of HV ECU and
GO terminal of ECM (See page IN±41).
NG Repair or replace wire harness.
OK
3 Check resistance of crankshaft position sensor and camshaft position sensor
(See page IG±1).
NG Replace the crankshaft position sensor or cam-
shaft position sensor.
OK
Replace ECM.

A15650
Hybrid Vehicle
Control ECU
25
H14IB B±L
R±W Battery ECU
26
H14 GB B±L6
IB1
10
IB1 R±W 16
B17
17
B17 IB
GB
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±231
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU checks the current value of the battery and detects malfunction.
DTC P3100 ± Information code 127, 128, 138
INF. Code.Detecting ConditionTrouble Area
127+B short in IB terminal circuit of HV ECU
128Open or short in IB terminal circuit of HV ECU
Wire harness
138When the difference between battery current of HV ECU
and current of battery is large.
Wire harness

HV ECU
WIRING DIAGRAM

DI±232
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Is DTC of battery ECU being output (See page DI±312)?
HINT:
In case of output of Information code 128, check whether V± wire harness of battery ECU DTC P3115 is open
or short at first. When there is no±abnormality, go to step 2.
Yes Check applicable DTC (See page DI±312).
NO
2 Check for open, short and +B short in wire harness between HV ECU IB and GB
terminals and battery ECU IB and GB terminals (See page IN±41).
HINT:
The HV ECU IB terminal has +B short if there is no open in wire harness and the voltage of the IB or GB
terminal is more than 5 V with the ignition ON.
NG Repair or replace wire harness.
OK
Replace HV ECU.

A14148
Hybrid Vehicle
Control ECU
Instrument Panel J/BI15
Ignition SW
Engine Room J/BFusible Link
Block No. 1ST2 R±W6
H13 2C2
W±R
2G2
W±R
1J9AM2
B
B±G
MAIN
Battery1B2
F121
F131
B±G
F181 Fusible Link
Block No. 2
ST2 AM27
8
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±233
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU checks the ST signal and detects malfunction. If the ST signal has +B short, the ST will always
be ON. Therefore, even with the IG ON when starting the THS, the system will start. To prevent this from
happening, the HV ECU detects the malfunction of the ST signal.
DTC P3100 ± Information code 142
INF. Code.Detecting ConditionTrouble Area
142When ST signal of HV ECU is ON, with ignition switch
turned OFF.
Wire harness

HV ECU

Ignition switch
WIRING DIAGRAM

DI±234
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check ignition switch (See page BE±17).
NG Replace ignition switch (See page SR±11).
NO
2 Check for +B short in wire harness between ignition switch ST2 terminal and HV
ECU ST2 terminal (See page IN±41).
HINT:
The HV ECU ST circuit has +B short if battery voltage is supplied to the ST2 terminal.
NG Repair or replace wire harness.
OK
Replace HV ECU.

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±235
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU checks the internal operation of the ECU and detects malfunction.
DTC P3100 ± Information code 134, 135, 139, 140, 141, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152,
153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173,
174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194,
195, 196, 197, 198, 199, 200, 201, 202, 203, 271, 310, 390, 391, 392, 393
INF. Code.Detecting ConditionTrouble Area
134HV ECU internal error
HV ECU
135
139
140
141
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169

DI±236
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)INF. Code.
Detecting ConditionTrouble Area
170HV ECU internal error
HV ECU
171
HV ECU internal errorHV ECU
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
271
310
390
391
392
393
INSPECTION PROCEDURE
If any of the above information codes is output, replace the HV ECU.

A14734
Hybrid Vehicle
Control ECU
19
H13
DTH+
DTH± R
G Battery ECU
18
H13 4
IF2
3
IF2 R
G 18
B17
19
B17 BEH+
BEH± DI±238
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
DTC P3105 Battery ECU Communication Circuit Mal-
function
CIRCUIT DESCRIPTION
The HV ECU monitors the communication signal from the battery ECU and if it cannot monitor it due to noise
or other reasons, judges as an error.
DTC P3105 ± Information code 206, 207, 208
INF. Code.Detecting ConditionTrouble Area
206
207When communication between battery ECU and HV ECU is
abnormal 1 sec after ignition is turned ON

Wire harness

Battery ECU208abnormal 1 sec. after ignition is turned ON
Battery ECU
WIRING DIAGRAM
DI830±02