Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 ax cip0500
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DI-174
DIAGNOSTICS - AUTOMATIC TRANSAXLE
DI4FE-02
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.
4-pulse 4-pulse
From ABS ECU ECM
Speed Sensor Combination
Meter
A00022
DTC No. DTC Detection Condition Trouble Area
S No speed sensor signal to ECM under conditions (a) and (b): S Open or short in speed signal circuit
(2-trip detection logic) S ABS speed sensor
(a) Park/neutral position switch is OFF. S Combination meter
P0500
(b) Vehicle is being driven. S ECM
S Clutch or brake slips or gear is broken. S ABS ECU
(2-trip detection logic) S Automatic transaxle (clutch, brake or gear etc.)
WIRING DIAGRAM
ECM
5V
Combination
Meter J/B No.3
11 13 18 22 SPD
V-Y V-Y
C10 3A 3C E9
D07889
2001 SIENNA (RM787U)
Author : Date : 328
DI-175
DIAGNOSTICS - AUTOMATIC TRANSAXLE
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD ll 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 stooped, the engine warmed up or not, the air-fuel ratio lean or rich, etc.
at the time of the malfunction.
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.
OK
2 Check for short in harness and connector between terminal SPD of ECM and
body ground.
PREPARATION:
(a) Remove the glove compartment (See page BO-101 ).
(b) Disconnect the connector of ECM.
CHECK:
Check continuity between terminal SPD of ECM and body
SPD ground.
OK:
No continuity (1 M or higher)
D06503
NG Repair of replace harness or connector.
OK
2001 SIENNA (RM787U)
Author : Date : 329
DI-176
DIAGNOSTICS - AUTOMATIC TRANSAXLE
3 Check voltage between terminal SPD of ECM connector and body ground.
ON
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal SPD of the ECM connector
and body ground.
OK:
(-) (+) SPD
Voltage: 9 - 14 V
D06502
NG Check for open in harness and connector be-
tween junction connector (J15) and ECM
(See page IN-31 ).
OK
4 Check for open in harness and connector between junction connector (J15) and
combination meter (See page IN-31 ).
NG Repair or replace harness or connector.
OK
5 Check ECM (See page IN-31 ).
NG Replace ECM.
OK
Check repair transaxle (clutch, brake or gear
etc.).
2001 SIENNA (RM787U)
Author : Date : 330
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