Page 761 of 1943
± DIAGNOSTICSENGINE
DI±163
2001 PRIUS (RM778U)
OK Go to step 5.
NG
Check for open in harness and connector between EFI main relay and circuit opening relay (Mark-
ing: C/OPN), circuit opening relay and ECM (See page IN±41).
5 Check fuel pump (See page SF±6).
NG Repair or replace fuel tank assembly.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump and body ground (See page IN±41).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±41).
Page 762 of 1943
A14005B10046
A14006
ON
FC
Fuel Inlet Hose
OFF
ON
DI±164
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
OBD II scan tool (excluding TOYOTA hand±held tester):
1 Check operation of fuel pump.
PREPARATION:
(a) Remove the ECM with connector still connected (See
page SF±62).
(b) Turn the ignition switch ON.
CHECK:
(a) Connect between terminal FC of the ECM connector and
body ground.
(b) Check for fuel pressure in the fuel inlet hose when it is
pinched off.
OK:
There is pressure in fuel inlet hose.
HINT:
At this time, you will hear a fuel return flowing noise.
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±22).
NG
2 Check for ECM power source circuit (See page DI±156).
NG Repair or replace.
OK
3 Check circuit opening relay (Marking: C/OPN) (See page SF±38).
NG Replace circuit opening relay.
OK
Page 763 of 1943
± DIAGNOSTICSENGINE
DI±165
2001 PRIUS (RM778U)
4 Check voltage between terminal FC of ECM and body ground
(See page DI±161).
OK Go to step 5.
NG
Check for open in harness and connector between EFI main relay and circuit opening relay (Mark-
ing: C/OPN), circuit opening relay and ECM (See page IN±41).
5 Check fuel pump (See page SF±6).
NG Repair or replace fuel tank assembly.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump and body ground (See page IN±41).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±41).
Page 764 of 1943
A14037
Combination MeterECM
Instrument Panel J/B
W
BatteryE10 IG1 Relay
6
J11
J/C IG1C11
C10
ID DC/DCG±R
2A
A 5
W
W±B
F114
3GAUGE
Ignition SW 22
2 3B±Y
21
2 1
1 1
MAINL
AM1
B±G4
FL Block No. 1FL Block No. 2 F1312D
2B 2K 2H
86 5
AM1
W±G
MIL
DI±166
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
MIL Circuit Malfunction
CIRCUIT DESCRIPTION
If the ECM detects trouble, the MIL lights up. At this time, the ECM records a DTC in memory.
HINT:
When the ignition switch is ON and ºREADYº indicator light is OFF, the bulb check of the ºMILº is performed
(ºMILº is ON).
When ºMILº is ON, but the DTC of the engine is not memorized, it may be because of HV control system
abnormality, so check HV control system beforehand.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Troubleshoot in accordance with the chart below for each trouble symptom.
MIL does not light up
Start inspection from step 1 in case of using TOYOTA hand±held
tester and start from step 2 in case of not using TOYOTA hand±
held tester
MIL remains on
After inspection of step 3, start inspection from step 4 in case of
using TOYOTA hand±held tester and start from step 5 in case of
not using TOYOTA hand±held tester
DI6MN±03
Page 766 of 1943
DI±168
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
5 Is any DTC output?
Check DTC on page DI±14.
YES Repair circuit indicated by output code.
NO
6 Check IG1 relay (Marking: IG1).
NG Replace IG1 relay.
OK
Check for short circuit in harness and con-
nector between DLC3 and ECM (See page
IN±41).
Page 787 of 1943
DI±190
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
218Regenerative brake ineffective
219Regenerative brake ineffective
P3109220Battery ECU Communication
Circuit MalfunctionRegenerative brake ineffectiveP3109
221Circuit MalfunctionRegenerative brake ineffective
222Regenerative brake ineffective
P3110223IGCT Relay MalfunctionNormal driving
224Normal driving
225Normal driving
226Impossible to drive
227Impossible to drive
P3115228System Main Relay Malfunc-
tionImpossible to driveP3115
229tionImpossible to drive
231Impossible to drive
232Limited driving
233Impossible to drive
234Regenerative brake ineffective
235Impossible to drive
236Normal driving
237Limited driving
239Limited driving
240Impossible to drive
241Normal driving
242Limited driving
243Limited driving
244Limited driving
245Limited driving
P3120246HV T l M lf tiLimited drivingP3120247HV Transaxle MalfunctionNormal driving
248Normal driving
249Normal driving
250Normal driving
253Limited driving
254Limited driving
255Limited driving
256Limited driving
257Normal driving
258Normal driving
259Normal driving
260Normal driving
Page 794 of 1943
DI82L±02
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±197
2001 PRIUS (RM778U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in the check mode, check the circuit for that code
listed in the table below. For the details of each code, turn to the page referred to under the ''See page'' for
the respective ''DTC No.'' in the DTC chart.
DTC No.
(See page)Detection ItemTrouble Area
Hybrid
System
Warning
Light*
Memory
B2799
(DI±210)Immobilizer MalfunctionWire Harness
Immobilizer System
C2692
(DI±212)Regenerative Brake Check±
C2693
(DI±212)Regenerative Brake Check±X
P1120
(DI±213)Accelerator Pedal Position
Sensor Circuit MalfunctionAccelerator Pedal Position Sensor
Wire Harness
P1520
(DI±215)Stop Light Switch (Cruise Con-
trol System) MalfunctionStop Light Switch
Wire Harness
Brake ECU
X
P1566
(DI±217)Cruise Control System Malfunc-
tionStop Light Switch
Brake ECU
Wire Harness
X
P1600
(DI±219)BATT MalfunctionHV Fuse
Wire Harness
P1780
(DI±221)Park/Neutral Position Switch
System MalfunctionPark/Neutral Position Switch
Wire Harness
P3000
(DI±223)HV Battery Malfunction
HV Battery System
High Voltage Fuse
Power Cable
HV Battery Cooling System
/X
P3001
(DI±224)HV Battery ECU MalfunctionBattery ECU
P3004
(DI±225)Power Cable Malfunction
Power Cable
HV Battery System
Service Plug
System Main Relay
Converter & Inverter Assembly
/X
P3100
(DI±229)HV ECU Malfunction
Wire Harness
HV ECU
ECM
Crankshaft Position Sensor
Camshaft Position Sensor
Ignition Switch
P3101
(DI±237)Engine System MalfunctionEngine
HV Transaxle
P3105
(DI±238)Battery ECU Communication Cir-
cuit MalfunctionWire Harness
Battery ECU
P3106
(DI±240)ECM Communication Circuit
MalfunctionWire Harness
ECM/X
Page 795 of 1943
DI±198
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)P3107
(DI±242)
Airbag ECU Communication Cir-
cuit MalfunctionWire Harness
Airbag Sensor Assembly
P3108
(DI±244)A/C Amplifier Communication
Circuit MalfunctionWire Harness
A/C AmplifierX
P3109
(DI±245)Brake ECU Communication Cir-
cuit MalfunctionWire Harness
Brake ECU
P3110
(DI±247)IGCT Relay MalfunctionWire Harness
IGCT Relay
P3115
(DI±249)System Main Relay Malfunction
Wire Harness
System Main Relay
HV ECU
P3120
(DI±252)HV Transaxle Malfunction
HV Transaxle
Wire Harness
System Main Relay
P3125
(DI±266)Converter & Inverter Assembly
MalfunctionConverter & Inverter Assembly
Wire Harness
P3130
(DI±302)Inverter Cooling System Mal-
function
Inverter Water Pump
Wire Harness
IG2 Relay
Electric Cooling Fan System
P3135
(DI±305)Circuit Breaker Sensor Malfunc-
tionCircuit Breaker Sensor
Wire Harness
P3140
(DI±307)Interlock Malfunction
Interlock Switch
Inverter Terminal Cover
Converter & Inverter Assembly
Wire Harness
P3145
(DI±310)Vehicle Speed Sensor Circuit
MalfunctionWire HarnessX
*: : Hybrid system warning light lights up. X: Hybrid system warning light does not light up.
