2001 TOYOTA PRIUS relay

DI±202
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)DTC NO.
INF. CodeDetection ItemDetecting Condition
209
210When communication between ECM and HV ECU is abnormal 1 sec. after
ignition is turned ON
P3106211ECM Communication Circuit
Malfunction
ignition is turned ON
P3106
212MalfunctionInput of abnormal signal from ECM
394When ECM does not operate
213
P3107214Airbag ECU Communication
Circuit Malfunction
When communication between airbag ECU and HV ECU is abnormal 10
sec after ignition is turned ONP3107
215Circuit Malfunctionsec. after ignition is turned ON
P3108216A/C Amplifier CommunicationWh i ti f A/C lifi t HV ECU i b lP3108217
A/C Am lifier Communication
Circuit MalfunctionWhen communication from A/C amplifier to HV ECU is abnormal
218
219When communication between brake ECU and HV ECU is abnormal 1.5
P3109220Brake ECU Communication
Circuit Malfunction
When communication between brake ECU and HV ECU is abnormal 1.5
sec. after ignition is turned ONP3109
221Circuit Malfunctiong
222When abnormal data is received from brake ECU
P3110223IGCT RelayWhen IGCT relay is always closed
224SMR C t1 M lf tiOpen or +B short in system main relay No. 1 circuit
225SMR Cont1 MalfunctionShort in system main relay No. 1 circuit
226SMR C t2 M lf tiOpen or +B short in system main relay No. 2 circuit
227SMR Cont2 MalfunctionShort in system main relay No. 2 circuit
P3115228SMR C t3 M lf tiOpen or +B short in system main relay No. 3 circuitP3115
229SMR Cont3 MalfunctionShort in system main relay No. 3 circuit
231System main relay + terminal deposited
232Deposit of SMRSystem main relay ± terminal deposited
233
De osit of SMR
System main relay + & ± terminal deposited
234Small reduction of motor magnetism
235E B l M lf tiLarge reduction of motor magnetism
236Energy Balance MalfunctionSmall reduction of generator magnetism
237Large reduction of generator magnetism
239Shaft damaged
240HV T l M lf tiGenerator locked
P3120241HV Transaxle MalfunctionTorque limiter slidingP3120242Planetary gear locked
243Motor resolver inter±phase short
244
Mt R l Mlf ti
Motor resolver inter±phase short (When there is a history that the state of
malfunction continued during inverter fail safe mode)
245Motor Resolver MalfunctionOpen or short in motor resolver circuit
246Open or short in motor resolver circuit (When there is a history that the
state of malfunction continued during inverter fail safe mode)

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±209
2001 PRIUS (RM778U) MWU (H11±6)
GInverter, M±WU (I9±3)
MUU (H11±4)RInverter, M±UU (I9±1)
MVU (H11±5)WInverter, M±VU (I9±2)
MIVG (H11±26)BInverter, M±GINV (I9±6)
MIVA (H11±16)BInverter, M±IVA (I10±1)
MIVB (H11±7)WInverter, M±IVB (I10±3)
MIWB (H11±17)GInverter, M±IWB (I10±4)
VB (H11±20)YInverter, VB (I10±5)
MIWA (H11±25)RInverter, M±IWA (I10±2)
GIVA (H11±19)BInverter, G±IVA (I12±1)
GIVB (H11±8)WInverter, G±IVB (I12±3)
GIWB (H11±18)GInverter, G±IWB (I12±4)
GIWA (H11±28)RInverter, G±IWA (I12±2)
GSDN (H11±12)YInverter, G±SDOWN (I11±4)
GIT (H11±23)LInverter, G±INVT (I11±5)
GWU (H11±3)GInverter, G±WU (I11±3)
GVU (H11±2)WInverter, G±VU (I11±2)
GUU (H11±1)RInverter, G±UU (I11±1)
GIVG (H11±27)BInverter, G±GINV (I11±6)
MFIV (H11±14)BInverter, M±FINV (I10±8)
GSIV (H11±15)GInverter, G±SINV (I12±7)
GFIV (H11±24)BInverter, G±FINV (I12±8)
ETH+ (H14±28)PEngine ECU, ETH+ (E9±28)
ETH± (H14±27)LEngine ECU, ETH± (E9±27)
HTE+ (H14±19)YEngine ECU, H TE+ (E9±19)
HTE± (H14±29)BREngine ECU, H TE± (E9±18)
HTB+ (H14±20)LGBrake ECU, HVI+ (B10±24)
HTB± (H14±30)VBrake ECU, HVI± (B10±16)
BTH+ (H14±18)GBrake ECU, HVO+ (B10±14)
BTH± (H14±17)RBrake ECU, HVO± (B10±22)
FCVC (H14±7)B±WTransponder Key ECU, HEVC (T4±8)
CON1 (H12±13)VSystem Main Relay (S8±3)
CON2 (H12±2)GRSystem Main Relay (S8±4)
CON3 (H13±1)PSystem Main Relay (S8±5)
HTD+ (H13±2)WBattery ECU, HTD+ (B17±6)
HTD± (H13±20)BBattery ECU, HTD± (B17±7)
DTD+ (H13±19)RBattery ECU, DTD+ (B17±18)
DTD± (H13±18)GBattery ECU, DTD± (B17±19)

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.

A14737
Hybrid Vehicle
Control ECU Engine Room R/B No. 2
Fusible Link
Block No. 1
Battery+B1
MREL 4
H14
1FG±Y
W±G
O 2
7
H12 W±G12
IA1
2 2
2
213 5
Engine
Room J/B 11
HV
F12B±GMAIN 1B 1
B
F13Fusible Link
Block No. 2
1
F18 A
J7
J/C
W±B
IE
EC W±B W±B
AJ1
J/C
AA IGCT Relay
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±247
2001 PRIUS (RM778U)
DTC P3110 IGCT Relay Malfunction
CIRCUIT DESCRIPTION
The HV ECU checks the IGCT relay and detects malfunction.
DTC P3110 ± Information code 223
INF. Code.Detecting ConditionTrouble Area
223
When IGCT relay is always closed.
Wire harness

IGCT relay
WIRING DIAGRAM
DI835±02

S04947S04946
A14712
12
35
12
35
Ohmmeter
Battery Continuity
Ohmmeter
Ohmmeter
ContinuityNo Continuity
DI±248
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check IGCT relay.
PREPARATION:
Remove the IGCT relay from the engine room R/B No. 3.
CHECK:
(a) Using an ohmmeter, check that there is continuity be-
tween terminals 1 and 2.
(b) Check that there is no continuity between terminals 3 and
5.
(c) Apply battery voltage across terminals 1 and 2. Using an
ohmmeter, check that there is continuity between termi-
nals 3 and 5.
OK:
(a) Continuity
(b) No continuity
(c) Continuity
NG Replace IGCT relay.
OK
Check for +B short in wire harness between HV ECU and IGCT relay (See page IN±41).
Repair or replace wire harness.
HINT:
The HV ECU MREL terminal has +B short if the battery voltage is always applied to the HV ECU +B1 or MREL
terminal with the ignition OFF.

A14143
Hybrid Vehicle
Control ECU
13
H12
CON1
CON2
CON3 System Main Relay
2
H12
1
H13 V
GR
P 3
S8V
GR
P 8
IH1
9
IH1
11
IF1 4
S8
5
S8
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±249
2001 PRIUS (RM778U)
DTC P3115 System Main Relay Malfunction
CIRCUIT DESCRIPTION
The HV ECU checks that the system main relay (No. 1, No. 2, No. 3) is normally operating and detects mal-
function.
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 P3115 ± Information code 224, 225, 226, 227, 228, 229
INF. Code.Detecting ConditionTrouble Area
224Open or +B short in system main relay No. 1 circuit
225Short in system main relay No. 1 circuit
226Open or +B short in system main relay No. 2 circuit
Wire harness
St i l227Short in system main relay No. 2 circuit
System main relay


HV ECU
228Open or +B short in system main relay No. 3 circuit

HV ECU
229Short in system main relay No. 3 circuit
WIRING DIAGRAM
DI836±02

DI±250
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between HV ECU terminals
(Cont1, Cont2, Cont3) and system main relay terminals (See page IN±41).
HINT:
Confirm that there is no open circuit in the wire harness. If the battery voltage is always applied to the HV
ECU Cont1, Cont2 and Cont3 terminals with the ignition ON (ºREADYº light OFF), the system main relay
has +B short.
NG Repair or replace wire harness.
OK
2 Is any of the information code 231, 232 or 233 recorded?
NO Replace HV ECU.
YES
Replace HV ECU and system main relay.