Page 1025 of 2543

(See page IN±30).
Check for open and short n harness and connector between terminals
EFI+, EFI±, TRAC+ and TRC± of ECU and ECM (See page IN±30).
When the TRAC indicator light is ON, there is a problem in the EFI + circuit, and when the TRAC in-
dictor light is OFF, there is a problem in the TRC + circuit.
Repair or replace harness or connector.
Check and replace ECM or TRAC ECU.
INSPECTION PROCEDURE
DTC 53 ECM Communication Circuit Malfunction
CIRCUIT DESCRIPTION
This circuit is used to send TRAC control information from the TRAC ECU to the ECM (TRC+, TRC±), and engine
control information from the ECM to the TRAC ECU (EFI+, EFI±).
DTC No. Diagnostic Trouble Code Detecting Condition Trouble area
53
Either of the following (1) or (2) continues for
5 sec.:
(1) A signal is received from the ECM indicating
trouble in the TRC+ or TRC±
circuit.
(2) No EFI + data is received from the ECM
when the engine speed is 500 RPM or
more, or the vehicle speed is 60 km/h
(37 mph) or more.
Open or short in TRC+ or TRC± circuit
Open or short in EFI+ or EFI± circuit
ECM
TRAC ECU
BR±156± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)
Page 1026 of 2543
DTC 61 ABS & TRAC ECU Communication Circuit Malfunction
CIRCUIT DESCRIPTION
DTC No. Diagnostic Trouble Code Detecting Condition Trouble area
61
Malfunction in ABS & TRAC ECU communication
circuit.
Open or short in ABSO, BRC, BRP circuit
ABS & TRAC ECU
TRAC ECU
± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)BR±157
Page 1027 of 2543
INSPECTION PROCEDURE
(See page IN±30).
Check for open and short n harness and connector between terminals
EFI+, EFI±, TRAC+ and TRC± of ECU and ECM (See page IN±30).
Check and replace TRAC ECU.
Check and replace TRAC ECU.
Repair or replace harness or connector.
Check and replace ABS & TRAC ECU.
Check voltage between terminals ABSO, BRC, BRP of TRAC ECU and
body ground with TRAC ECU connector disconnected.
Check for open and short in harness and connector between ABS & TRAC
ECU and TRAC ECU (See page IN±30).
Remove TRAC ECU with connectors still con-
nected.
Measure voltage between terminals ABSO, BRC,
BRP of TRAC ECU and body ground when ignition
switch is turned ON.
Voltage:
ABSO, BRC: 6 Ð 14 V
BRP: About 7 V (Pulse)
Disconnect TRAC ECU connector.
Measure voltage between terminals ABSO, BRC,
BRP of TRAC ECU and body ground when ignition
switch is turned ON.
Voltage: See step 1. BR±158
± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)
Page 1028 of 2543
TRAC OFF Indicator TRAC Cut Switch Circuit
CIRCUIT DESCRIPTION
This is the TRAC control main switch. When the TRAC cut switch is pushed on, TRAC control goes off and the
TRAC OFF indicator lights up. This indicator is also used for warnings when the trouble occurs.
± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)BR±159
Page 1029 of 2543
page BR±126.
page BR±43.
(See page IN±30).
Is diagnostic trouble code output?
Check for open and short in harness and connector between terminal CSW
of TRAC ECU and TRAC cut switch and body ground (See page IN±30).
1. Remove TRAC cut switch.
2. Disconnect TRAC cut switch connector.
Measure resistance between terminals 1 and 2 of
TRAC cut switch when TRAC cut switch is on and
off.
Do diagnostic trouble code check on page BR 126.
Repair circuit indicated by the code output.
Replace TRAC cut switch.
Repair or replace harness or connector.
Check TRAC OFF indicator light.
See Combination Meter Troubleshooting on page BR±43.
Check TRAC cut switch.
TRAC car switch
Pushed in
Released
Continuity
1 M or higher
Resistance
INSPECTION PROCEDURE
BR±160± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)
Page 1030 of 2543
Check TRAC solenoid relay.
Remove solenoid relay from R/B No.5.
Check continuity between each terminal of TRAC
solenoid relay shown below.
Repair or replace harness or connector.
Check and replace TRAC ECU.
Replace TRAC solenoid relay.
Apply battery positive voltage between termi-
nals 4 and 6
.
Check continuity between each terminal of
TRAC solenoid relay shown below.
Terminals 4 and 6
Terminals 2 and 3
Terminals 1 and 3
Continuity
Open
Continuity
(Reference value 80 )
Check for open and short in harness and connector between terminal WT
of TRAC ECU and battery or TRAC solenoid relay (See page IN±30).
Connect the test lead to terminal 5 and the
lead to terminal 3. Check continuity between the
terminals.
Continuity
If there is no continuity, connect the
test lead to
terminal 5 and the
lead to terminal 3. Recheck
continuity between terminals.
Terminals 2 and 3
Terminals 1 and 3Continuity
Open
± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)BR±161
Page 1031 of 2543
TRAC Indicator Light Circuit
CIRCUIT DESCRIPTION
The TRAC indicator blinks during TRAC operation.
This indicator is also used for warnings when the trouble occurs and for displaying diagnostic trouble
codes.
Repair or replace harness or connector.
Check and replace TRAC ECU.
Repair circuit indicated by the code output.
Check diagnostic trouble code (See page BR±126).
INSPECTION PROCEDURES
Troubleshoot in accordance with flow chart instructions for each trouble symptom.
TRAC Indicator light does not light up
Go to Combination Meter Troubleshooting on page BE±43.
TRAC Indicator light remains ON
Check for short in harness and connector between TRAC ECU and TRAC
indicator light (See page IN±30).
Indicator light remains ONOutput
NG Code
BR±162± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)
Page 1032 of 2543
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of DLC1 or DLC2, the ECU displays the diagnostic trouble code
by blinking the TRAC indicator light.
± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)BR±163