Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 ccs ciectcir
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DI-592
DIAGNOSTICS - CRUISE CONTROL SYSTEM
DI08U-24
Electronically Controlled Transmission Communication Circuit
CIRCUIT DESCRIPTION
When driving uphill under cruise control, in order to reduce shifting due to ON-OFF overdrive operation and
to provide smooth driving, when down shifting in the electronically controlled transmission occurs, a signal
to prevent upshift until the end of the up hill slope is sent from the cruise control ECU to the electronically
controlled transmission.
Terminal ECT of the cruise control ECU detects the shift change signal (output to electronically controlled
transmission No. 2 solenoid) from the ECM.
If vehicle speed down, also when terminal ECT of the cruise control ECU receives down shifting signal, it
sends a signal from terminal OD to ECM to cut overdrive until the end of the uphill slope, and the gear shifts
are reduced and gear shift points in the electronically controlled transmission are changed.
WIRING DIAGRAM
ECM Cruise Control ECU
24 14
B-L
OD1 E9 C15 OD
J13
Junction
1 11 Connector
13 6
L-B L-B L-B L-B
S2 E10 IH2 IH1 C15 ECT
D D
D
L-B
10
ECT No.2
Solenoid
E1 Electronically Controlled
Transmission Solenoid
I19493
2001 SIENNA (RM787U)
Author : Date : 746
DI-593
DIAGNOSTICS - CRUISE CONTROL SYSTEM
INSPECTION PROCEDURE
1 Check operation of overdrive.
PREPARATION:
Test drive after engine warms up.
CHECK:
Check that overdrive ON OFF occurs with operation of OD switch ON-OFF.
NG Check and repair electronically controlled
transmission (See page DI-204 ).
OK
2 Check voltage between terminal OD of harness side connector of cruise control
ECU and body ground.
PREPARATION:
ON
(a) Remove the ECU with connector still connected.
O/D (b) Turn ignition switch ON.
(c) Disconnect the ECU connector.
CHECK:
Measure voltage between terminal OD of harness side connec-
tor of ECU and body ground.
OK:
Voltage: 10 - 14 V
(-) (+)
AB0119
I00143
I00174
NG Go to step 5.
OK
2001 SIENNA (RM787U)
Author : Date : 747
DI-594
DIAGNOSTICS - CRUISE CONTROL SYSTEM
3 Check voltage between terminal ECT of cruise control ECU connector and body
ground (On test drive).
PREPARATION:
(a) Connect the ECU connector.
(b) Test drive after engine warms up.
CHECK:
Check voltage between terminal ECT of ECU connector and
body ground when OD switch is ON and OFF.
(-) (+) ECT OK:
OD switch position Voltage
I00141
ON 8 - 14 V
OFF Below 0.5 V
OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-572 ).
NG
4 Check harness and connector between terminal ECT of cruise control ECU and
electronically controlled transmission solenoid (See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU.
5 Check harness and connector between terminal OD of cruise control ECU and
terminal OD1 of ECM (See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-31 ).
2001 SIENNA (RM787U)
Author : Date : 748
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