Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne di abswebdb cic12035
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DI-260
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6CE-03
DTC C1203 / 53 ECM Communication Circuit Malfunc-
tion
CIRCUIT DESCRIPTION
The 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
Either the condition 1. or 2. continues for 5 sec.:
1. ECU IG1 terminal voltage is 9.5 V to 17.0 V and data
transmission to the ECM is impossible. S TRC+ or TRC- circuit
C1203 / 53 2. ECU IG1 terminal voltage is 9.5 V to 17.0 V, engine S ENG+ or ENG- circuit
speed is 500 rpm or more or vehicle speed is 60 km/h S ECM
(36 mph) or more and data receiving from the ECM is
impossible.
WIRING DIAGRAM
ECM Skid Control ECU
19 6
L
ENG+ E12 V19 ENG+
18 5
P
ENG- E12 V19 ENG-
28 4
BR-Y
TRC+ E12 V19 TRC+
27 17
Y-G
TRC- E12 V19 TRC-
F02659
2002 4RUNNER (RM887U)
Author : Date : 436
DI-261
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Check skid control ECU communication.
Normal Signal Waveform (REFERENCE) INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the skid control ECU with the connector still con-
nected.
GND (b) Connect the oscilloscope to each of terminals ENG+ -
ENG- and TRC+ - TRC- of the skid control ECU.
CHECK:
Start the engine and check the signal waveform.
2 m/s / Division
1 V / Division F10171
OK Check and replace skid control ECU.
NG
2 Check for open and short circuit in harness and connector between each of ter-
minals ENG+, ENG-, TRC+, TRC- of skid control ECU and ECM (See page
IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
2002 4RUNNER (RM887U)
Author : Date : 437
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