Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 abswebdb cic13545
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DI-323
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6OE-02
DTC 53 ECM Communication Circuit Malfunction
CIRCUIT DESCRIPTION
The circuit is used to send TRAC & VSC control information from the translate ECU to the ECM (TRC+,
TRC-), and engine control information from the ECM to the translate ECU (ENG+, ENG-).
DTC No. DTC Detecting Condition Trouble Area
When any of the following 1. through 3. is detected :
1. IG1 voltage is 8.5 V or more, and the condition that data
can not be sent to ECM continues for 5 sec. or more.
S TRC+ or TRC- circuit
2. IG1 voltage is 8.5 V or more, engine speed is 500 r.p.m
S ENG+ or ENG- circuit
53 or more, and the condition that data can not be received
S ECM
from ECM continues for 5 sec. or more.
S Translate ECU
3. The condition that data can not be transmitted between
the translate ECU and ECM occurs at least once within
5 sec. continues 10 consecutive times.
WIRING DIAGRAM
ECM Translate ECU
20 7
L-W
TRC- E8 T10 TRC-
13 20
O
TRC+ E8 T10 TRC+
21 9
W
ENG- E8 T10 ENG-
14 22
G
ENG+ E8 T10 ENG+
F09815
2001 SIENNA (RM787U)
Author : Date : 477
DI-324
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Check translate ECU communication.
Normal Signal Waveform REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the translate ECU.
(b) Connect the oscilloscope to each of the terminals ENG+
GND or TRC+ and GND of the translate ECU harness side con-
nector.
CHECK:
Start the engine, and check the signal waveform.
2 m/s / Division
1 V / Division F10171
OK Check and replace translate ECU.
NG
2 Check for open and short circuit in harness and connector between each of ter-
minals ENG+, ENG-, TRC+ and TRC- of translate ECU and ECM (See page
IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
2001 SIENNA (RM787U)
Author : Date : 478
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