2001 TOYOTA PRIUS Service Repair Manual

A13630THRO FuseR/B No.2
A13631
BM
(+)(±)
± DIAGNOSTICSENGINE
DI±111
2001 PRIUS (RM778U)
1 Check THRO fuse of R/B No.2.
PREPARATION:
Remove the THRO fuse from the Engine room J/B.
CHECK:
Check the countinuity of the THRO fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to THRO fuse.
OK
2 Check voltage between terminal +BM of ECM connector and body ground.
PREPARATION:
Remove the ECM with connector still connected (See page
SF±62).
CHECK:
Measure the voltage between terminal BM of the ECM connec-
tor and body ground.
OK:
Voltage: 9 ± 14 V
OK Check and replace ECM (See page IN±41).
NG
Check and repair harness or connector be-
tween battery and ETCS fuse, and ETCS fuse
and ECM (See page IN±41).

DI±112
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
DTC P1128 Throttle Control Motor Lock Malfunction
CIRCUIT DESCRIPTION
Throttle motor is operated by the ECM and it opens and closes the throttle valve.
The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the
throttle body and it provides feedback to the ECM to control the throttle motor in order the throttle valve open-
ing angle properly in response to driving condition.
If this DTC is stored, the ECM shuts down the power for the throttle motor, and the throttle valve is fully closed
by the return spring.
DTC No.DTC Detecting ConditionTrouble Area
P1128Lock throttle control motor during control throttle control motor
Throttle control motor

Throttle body
WIRING DIAGRAM
Refer to DTC P1125 on page DI±108.
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air±fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check throttle control motor (See page DI±108).
NG Replace throttle control motor
(See page SF±29).
OK
2 Visually check throttle valve.
PREPARATION:
Remove the intake air resonator.
CHECK:
Check whether or not a foreign body is caught between the throttle valve and housing.
NG Remove foreign body and clean throttle body.
DI7SX±01

± DIAGNOSTICSENGINE
DI±113
2001 PRIUS (RM778U)
OK
Replace throttle body.

± DIAGNOSTICSENGINE
DI±115
2001 PRIUS (RM778U)
DTC P1300 Igniter Circuit Malfunction (No.1)
DTC P1305 Igniter Circuit Malfunction (No.2)
DTC P1310 Igniter Circuit Malfunction (No.3)
DTC P1315 Igniter Circuit Malfunction (No.4)
CIRCUIT DESCRIPTION
A DIS (Direct Ignition System) has been adopted. The DIS improves the ignition timing accuracy, reduces
high±voltage loss, and enhances the the overall reliability of the ignition system by eliminating the distributor.
The DIS is a 1±cylinder ignition system which ignites one cylinder with one ignition coil. In the 1±cylinder
ignition system, the one spark plug is connected to the end of the secondary winding. High voltage generated
in the secondary winding is applied directly to the spark plug. The spark of the spark plug pass from the center
elecrtode to the ground electrode.
The ECM determines ignition timing and outputs the ignition signals (IGT) for each cylinder. Based on IGT
signals, the power transistors in the igniter cuts off the current to the primary coil in the ignition coil is supplied
to the spark plug that are connected to the end of the secondary coil. At the same time, the igniter also sends
an ignition confirmation signal (IGF) as a fail±safe measure to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300
P1305
P1310
P1315
No IGF signal to ECM while engine is running

Ignition system

Open or short in IGF1 and IGT1 ± 4 circuit from
ignition coil with igniter

No.1 ± No.4 ignition coil with igniter

ECM
DI6VI±02

A14055
BatteryEAN1
Noise
Filter Engine Room J/B
Ignition SW Instrument
Panel J/B3
B±R I4 Ignition Coil
and Igniter No. 4
1ECM
14
Y
E7
E7
E7
E7 13
12
25IGT4
IGT3
IGT2
IGF
E711
IGT1 1
2
4
G
W
B±R
B±R
Y±G 3
4
2 1I3 Ignition Coil
and Igniter No. 3
3
4
2 1I2 Ignition Coil
and Igniter No. 2
2 I1 Ignition Coil
and Igniter No. 1
1
3
4
B±W
B±W
B±W
B±W
B±W
B±W
B±RB±RB±R
B±R
W±B W±B
W±B
W±B
W±B
W±B
B±W
W±B B±W
W±R
B±W IG2 Relay
5
1 3
29
1J
3
1J 2
1A
3
1K
AM2
2
1B
B
F12
12G 11
2B 5
2C 22G 1
B±W
W±R
67
IG2AM2
FL
Block
No. 1
F13
1
B±G
FL
Block
No. 2
MAIN
W±B
A
AJ7
J/C
W±B
A
J1
J/C
IE
B±W
DI±116
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTC P1300 is displayed, check No.1 ignition coil with igniter circuit.

If DTC P1305 is displayed, check No.2 ignition coil with igniter circuit.

If DTC P1310 is displayed, check No.3 ignition coil with igniter circuit.

If DTC P1315 is displayed, check No.4 ignition coil with igniter circuit.

Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.