1995 TOYOTA SUPRA Service Repair Manual

deactivate passenger airbag radio trunk release automatic transmission seat memory auxiliary battery

Page 1001 of 2543

TOYOTA SUPRA 1995 Service Repair Manual TRAC ECU:
ConditionSTD Voltage (V)Symbols
(Terminals No.)
Always
Always
IG switch ON
5 seconds after IG switch ON
Sub throttle valve fully open
5 seconds after IG switch ON
Sub throttle valve fully op

Page 1002 of 2543

TOYOTA SUPRA 1995 Service Repair Manual PROBLEM SYMPTOMS CHART
If a normal code is displayed during the diagnostic trouble code check but the problem still occurs, check the
circuits for each problem symptom in the order given in the table

PROBLEM SYMPTOMS CHART
If a normal code is displayed during the diagnostic trouble code check but the problem still occurs, check the
circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshoot-
ing page.

Symptoms

Inspection Circuit

See page

TRAC does not
operate.

Only when 1. ~ 5, are all normal and the problem is still occurring,
replace the TRAC ECU.
1. Check the diagnostic trouble code, reconfirming that the Normal
code is output
2. IG power source circuit.
3. Check the hydraulic circuit for leakage.
4. Speed sensor circuit.
5. Park/neutral position switch circuit.

BR±126
BR±142
BR±165
BR±138
AT1±81 or AT2±101

TRAC indicator light
abnormal.
1. TRAC indicator light circuit.
2. TRAC ECU.
BR±162

TRAC OFF indicator
light abnormal.

Only when 1. and 2. are all normal and the problem is still occurring,
replace the TRAC ECU.
1. TRAC OFF indicator light circuit.
2. TRAC cut switch circuit.

BR±159
BR±159

Diagnostic trouble
code check cannot
be performed.

Only when 1. and 2, are all normal and the problem is still occurring,
replace the TRAC ECU.
1. TRAC indicator light circuit
2. Tc terminal circuit.

BR±162
BR±163
± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)BR±133

Page 1003 of 2543

TOYOTA SUPRA 1995 Service Repair Manual CIRCUIT INSPECTION
DTC 24 TRAC Sub±Throttle Actuator Circuit
CIRCUIT DESCRIPTION
The sub±throttle actuator operates in accordance with signals from the ECU, controlling the opening
and closing of th

Page 1004 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Remove TRAC fuse from R/B No.2.
Check continuity of TRAC fuse.
Continuity
Check TRAC fuse.
Check for short in all harness and components
connected to TRAC fuse.
INSPECTION PROCEDURE
Check voltage betw

Page 1005 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page IN±30).
Disconnect sub±throttle actuator connector.
Check continuity between each terminal of sub±throttle
actuator connector shown below.
Terminals 1 and 2
Terminals 2 and 3
Terminals 4

Page 1006 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC 25 26 TRAC Sub±Throttle Valve
DTC No. Diagnostic Trouble Code Detecting Condition Trouble area

DTC 25 26 TRAC Sub±Throttle Valve
DTC No. Diagnostic Trouble Code Detecting Condition Trouble area

25

The difference between the sub±throttle
sensor signal voltage and the voltage
required by the step count is 1 V or more.

Sub±throttle actuator.
Throttle body (sub±throttle valve is stuck
or operation is faulty).
Sub±throttle position sensor.
Open or short in sub±throttle position sensor cir±
cuit.
ECM
TRAC ECU

26

Even when sub±throttle valve is driven to the
fully open position, input voltage at terminal
VTA2 of ECM does not come within range of
the specifications 3±4.5 V.

Sub±throttle actuator.
Throttle body (sub±throttle valve is stuck
or operation is faulty).
Sub±throttle position sensor.
Open or short in sub±throttle position sensor cir
cuit.
ECM
TRAC ECU
Remove air duct.
Open and close the sub±throttle valve manually and check
the condition during operation.
The valve should operate smoothly without catching.
HINT: If sub throttle actuator, sub±throttle valve, sub±throttle posi±
tion sensor and harness are free from any defect, ECM may
be defective.
If ECM is free from any defect, TRAC ECU may be defec±
tive.
± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)BR±137

Page 1007 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC 31 32 33 34 Speed Sensor Circuit
HINT: DTC No.31 is for the right front speed sensor.
DTC No.32 is for the left front speed sensor.
DTC No.33 is for the right rear speed sensor.
DTC No.34 is for t

Page 1008 of 2543

TOYOTA SUPRA 1995 Service Repair Manual ± BRAKE SYSTEMTRACTION CONTROL SYSTEM (TRAC)BR±139

Load next 8 pages

Page: < prev 1-10 ... 969-976 977-984 985-992 993-1000 1001-1008 1009-1016 1017-1024 1025-1032 1033-1040 ... 2544 next >

air condition charging oil temperature key battery spare wheel center console