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DI-1 13
DIAGNOSTICS - ENGINE (5VZ-FE)
DI8XK-01
DTC P1125 Throttle Control Motor Circuit 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 to the throttle valve
opening angle properly in response to driving condition.
If this DTC is stored, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the
throttle valve is fully closed by the return spring.
However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the
throttle cable.
DTC No. DTC Detecting Condition Trouble Area
Conditions (a) and (b) continue for 0.5 seconds:
(a) Throttle control motor output duty y 80 %
(b) Throttle control motor current < 0.5 A S Open or short in throttle control motor circuit
P1125 S Throttle control motor
Throttle control motor current y 16 A
S ECM
Condition (a) continues for 0.6 seconds:
(a) Throttle control motor current y 7 A
WIRING DIAGRAM
T7 ECM
Throttle Control Motor
with Magnetic Switch
9
2 R
E9 M+
31
1 G
E9 M-
2
3 Y
E11 CL+
8
4 L
E11 CL-
A02990 A09802
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.
2002 4RUNNER (RM887U)
Author : Date : 289
DI-1 14
DIAGNOSTICS - ENGINE (5VZ-FE)
1 Check throttle control motor circuit.
M+ Signal Waveform When not using TOYOTA hand-held tester:
5 V/ PREPARATION:
Division (a) Connect the oscilloscope between terminals M+ or M-
and E1 of the ECM connector.
(b) Start the engine.
CHECK:
GND Check the waveform between terminals M+ or M- and E1 of the
ECM when the engine is idling.
1 msec./Division
OK:
The correct waveforms are as shown.
M- Signal Waveform
HINT:
5 V/
The waveform frequency varies depending on the throttle
Division
opening.
GND
OK Check and replace ECM (See page IN-28 ).
A03403 1 msec./Division
A03404 A03675
NG
2 Check throttle control motor (See page SF-30 ).
NG Replace throttle control motor
(See page SF-32 ).
OK
3 Check for open and short in harness and connector between throttle control mo-
tor and ECM (See page IN-28 ).
NG Repair or replace.
OK
Check and replace ECM (See page IN-28 ).
2002 4RUNNER (RM887U)
Author : Date : 290
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