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DI-204
DIAGNOSTICS - AUTOMATIC TRANSAXLE
DI69O-04
O/D Main Switch & O/D OFF Indictor Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch is a momentary type switch. When pressing the O/D main switch, the O/D OFF indicator
light lights up and ECM prohibits shifting to O/D, and when pressing it again, the O/D OFF indicator light goes
off and ECM allows shifting to O/D. Turning the IG switch OFF will reset the O/D OFF indicator light.
WIRING DIAGRAM
Combination Meter ECM
J17 J/C J18 J/C 9 8 9
A A GR GR *2 G-R
C10 C10 E8 ODLP
D D
*1
GR GR
Driver Side J/B No. 1 Ignition Switch
2 GAUGE 1
B-Y 4 2
1D 1K
W-L
Engine Room J/B Driver Side J/B No. 1
2 2 1 AM1 2
W 1 2
2D 2L 1B 1K
W
F8 Fusible Link Block
INP ALT 12
4 1 G-O
E10 ODMS
B-L O/D Main Switch
FL MAIN 3 1
J2 J/C
A A
W-B
Battery
IJ
*1: w/o VSC
*2: w/ VSC
D10341
2001 SIENNA (RM787U)
Author : Date : 358
DI-205
DIAGNOSTICS - AUTOMATIC TRANSAXLE
INSPECTION PROCEDURE
1 Check operation of O/D main switch
PREPARATION:
Turn the ignition switch ON.
CHECK:
(a) Check O/D OFF indicator light when O/D main switch is
pushed in to ON.
(b) Check O/D OFF indicator light when O/D main switch is
pushed again.
OK:
(a) O/D OFF indicator light lights up.
(b) O/D OFF indicator light goes off.
OK Proceed to next inspection shown on problem
symptoms tables (See page DI-171 ).
NG
2 Check and replace the combination meter (See page BE-48 ).
NG Replace the combination meter.
OK
3 Check O/D main switch.
PREPARATION:
Disconnect the O/D main switch connector.
CHECK:
1 3
Check continuity between terminals 1 and 3 of O/D main switch
connector.
OK:
O/D main switch condition Specified condition
Press continuously O/D main switch Continuity
D02004
Release O/D main switch No continuity
NG Replace and repair O/D main switch.
OK
2001 SIENNA (RM787U)
Author : Date : 359
DI-206
DIAGNOSTICS - AUTOMATIC TRANSAXLE
4 Check voltage between terminal ODMS of ECM and body ground.
ON PREPARATION:
ODMS Turn the ignition switch ON.
CHECK:
Check voltage between terminal ODMS of ECM and body
ground when O/D main switch is ON and OFF.
OK:
(-) (+) O/D main switch Specified voltage
Press continuously O/D main switch Below 1.0 V
D10342
Release O/D main switch 10 - 14 V
OK Check and replace the ECM (See page IN-21 ).
NG
5 Check voltage between terminal ODLP of ECM and body ground.
ON
PREPARATION:
(a) Disconnect the connector of ECM.
(b) Turn the ignition switch ON.
ODLP CHECK:
Check voltage between terminal ODLP of ECM and body
ground.
(-) (+) OK:
Voltage: 7.5 - 14 V
D10343
OK Check and replace the ECM (See page IN-21 ).
NG
Check and replace harness and connector between combination meter and ECM, O/D main
switch and ECM, O/D main switch and body ground (See page IN-21 ).
2001 SIENNA (RM787U)
Author : Date : 360
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