Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 20ahm cic12035
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05-475
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM 05BYE-02
DTC C1203/53 ECM COMMUNICATION CIRCUIT
MALFUNCTION
CIRCUIT DESCRIPTION
This circuit is used to send TRAC & VSC control information from the skid control ECU to the ECM (TRC+,
TRC-), and engine control information from the ECM to the skid control ECU (ENG+, ENG-).
DTC No. DTC Detecting Condition Trouble Area
S When IG1 terminal voltage is 9.5 V or more, the condition
that the data is not transmitted to ECM continues for more
than 5 sec.
S When ECU IG1 terminal voltage is 9.5 V or more and the
engine speed is 500 rpm or more, data reception from the S TRC+ or TRC- circuit
C1203 / 53 ECM is impossible for 5 sec. or more. S ENG+ or ENG- circuit
S The condition that data transmission and reception to/from S ECM
ECM is impossible once or more within 5 sec. repeatedly
occurs.
S When the data about engine, drive system, and user
country from ECM does not match up to skid control ECU.
WIRING DIAGRAM
Skid Control ECU
ECM With Actuator
J/C
24 25 8 9
P P
ENG+ E4 J4 J3 S3 ENG+
30 24 7 23
ENG- E4 V J4 J3 V S3 ENG-
25 27 10 8
LG-B LG-B
TRC+ E4 J4 J3 S3 TRC+
31 26 9 22
LG-R LG-R
TRC- E4 J4 J3 S3 TRC-
F45123
INSPECTION PROCEDURE
1 CHECK HARNESS AND CONNECTOR(ENG+, ENG-, TRC+, TRC- OF ECM AND
SKID CONTROL ECU)(See page 01-37 )
(a) Check for an open or short circuit in harness and connector between the ECM and skid control ECU.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 658
05-476
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
2 CHECK HARNESS AND CONNECTOR(E1 OF ECM AND BODY GROUND)
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE ECM(See page 10-17 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 659
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