Toyota RM787U, Руководство по обслуживанию и ремонту

Страница: 399 / 1976

DI4FE-02
A00022
From
Speed Sensor
4-pulse
ABS ECU
Combination
Meter
4-pulse
ECM
D07889
Combination
Meter
13
3A
3C
J/B No.3
22 11
C10
V-Y
ECM
SPD
E9
5V
18
V-Y
DI-174
- DIAGNOSTICS AUTOMATIC TRANSAXLE
328
Author: Date:
2001 SIENNA (RM787U)
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 in-
side the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based
on the frequency of these pulse signals.
DTC No. DTC Detection Condition Trouble Area
P0500
No speed sensor signal to ECM under conditions (a) and (b):
(2-trip detection logic)
(a) Park/neutral position switch is OFF.
(b) Vehicle is being driven.
Clutch or brake slips or gear is broken.
(2-trip detection logic)
Open or short in speed signal circuit
ABS speed sensor
Combination meter
ECM
ABS ECU
Automatic transaxle (clutch, brake or gear etc.)
WIRING DIAGRAM