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DI-179
DIAGNOSTICS - AUTOMATIC TRANSMISSION
DI3BU-10

CIRCUIT INSPECTION

DTC P0500 Vehicle Speed Sensor Malfunction

CIRCUIT DESCRIPTION
The speed sensor for ABS detects the wheel speed and sends the appropriate signals to the ABS ECU. The
ECU converts these signals into a 4-pulse signal and outputs it to the combination meter. After this signal
is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combina-
tion meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency
of these pulse signals.

4-pulse 4-pulse

From ABS ECU ECM
Speed Sensor Combination
Meter

A00022

DTC No. DTC Detecting Condition Trouble Area
No vehicle speed sensor signal to ECM under conditions 1. S Open or short in No. 1 vehicle speed sensor circuit
and 2. (2-trip detection logic). S No. 1 vehicle speed sensor
P0500 1. Park/neutral position switch is OFF. S Combination meter
2. Vehicle is being driven. S ECM
Clutch or brake slips or gear is broken S Automatic transmission (clutch, brake or gear etc.)

HINT:
Check the No. 1 vehicle speed sensor when DTC P0500 (Vehicle Speed Sensor Malfunction) is output.

WIRING DIAGRAM

ECM
Combination Meter

Center J/B
3 8 10 6
G-O G-O
C28 3E 3E E14 SP1

D10532

2002 4RUNNER (RM887U)

Author : Date : 355
DI-180
DIAGNOSTICS - AUTOMATIC TRANSMISSION

INSPECTION PROCEDURE

1 Check operation of speedometer.

CHECK:
Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer display is normal.

NG Check speedometer circuit (See page BE-40 ).

2 Check voltage between terminal SP1 of ECM connector and body ground.

PREPARATION:
ON SP1 (a) Shift the shift lever to neutral.
(b) Jack up a rear wheels on one side.
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal SP1 of ECM connector and
body ground when the wheel is turned slowly.
(-) (+) OK:
D10502 Voltage is generated intermittently.

4.5 - 5.5 V

0
Turn the wheel
AT7809

NG Check and repair harness and connector
between combination meter and ECM
(See page IN-28 ).

2002 4RUNNER (RM887U)

Author : Date : 356
DI-181
DIAGNOSTICS - AUTOMATIC TRANSMISSION

3 Check ECM (See page IN-28 ).

NG Replace the ECM.

Check and repair the transmission (clutch,
brake or gear etc.).

2002 4RUNNER (RM887U)

Author : Date : 357

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