Page 729 of 1807
S03240
Check Harness A
AC1 (+)
DI-314
- DIAGNOSTICSENGINE (2JZ-GTE)
542 Author: Date:
1997 SUPRA (RM502U)
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-169).
NG
2 Check for open and short in harness and connector between ECM and A/C am-
plifier (See page IN-28).
NG Repair or replace harness or connector.
OK
3 Check voltage between terminal AC1 of ECM connector and body ground.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Start the engine.
CHECK:
Measure voltage between terminal AC1 of ECM connector and
body ground when A/C switch is turned to ON and OFF.
OK:
A/C Switch ConditionVoltage
ON0 - 1.5 V
OFF7.5 - 14 V
NG Check and replace A/C amplifier.
OK
Check and replace ECM (See page IN-28).
Page 730 of 1807
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-315
543 Author: Date:
1997 SUPRA (RM502U)
OBDII scan tool (excluding TOYOTA hand-held tester)
1 Check voltage between terminal AC1 of ECM and body ground (See page
DI-313, step 3).
OK Check and replace ECM (See page IN-28).
NG
2 Check for open and short in harness and connector between ECM and A/C am-
plifier (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace A/C amplifier.
Page 731 of 1807
DI4V4-01
Vehicle Brought to Workshop
Customer Problem Analysis
P. DI-441
Check and Clear DTC (Precheck)
P. DI-442Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom ConfirmationSymptom Simulation
P. IN-18
Symptom
does not occur
Symptom
occurs
DTC Check
P. DI-442
Sensor CheckCircuit Inspection
P. DI-453 ~ DI-498
DTC Chart
P. DI-447 Malfunction codeProblem Symptoms Chart
P. DI-452
Check for Fluid Leakage
P. DI-498
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
67
89
10
11
Step 2, 5, 8, 9, 11:Diagnostic steps permitting the use of the
TOYOTA hand-held tester or TOYOTA
break-out-box.
DI-440
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
668 Author: Date:
1997 SUPRA (RM502U)
ANTI-LOCK BRAKE SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshooting in accordance with the procedure on the following pages.
Page 732 of 1807
DI4V5-01
ABS Check Sheet
Inspector 's
Name:
Customer 's Name
Date Vehicle
Brought InRegistration Year Registration No.
Frame No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
Remains ONDoes not Light Up
Symptomskm
miles
ABS does not operate.
ABS Warning Light
AbnormalABS does not operate efficiently.
Check ItemTRAC Indicator
LightNormalDoes not Light Up
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
1st Time
DTC Check
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-441
669 Author: Date:
1997 SUPRA (RM502U)
CUSTOMER PROBLEM ANALYSIS CHECK
Page 733 of 1807

DI4V6-01
F02620
R06980
Short Pin
DLC1
S-17-1 Iei-23-1-A
F00041
DLC2
Tc E 1DLC1
Tc E1
R01346
Normal Code
2 sec.
ON
OFF0.25
sec.
0.25
sec.
Code 11 and 21
0.5
sec.
4 sec.1.5
sec.2.5 sec.0.5
sec.
Code 21
Code 11 ON
OFF DI-442
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
670 Author: Date:
1997 SUPRA (RM502U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Check the Indicator,
When the ignition switch is turned ON, check that the ABS
warning light goes on for 3 seconds.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting for the ABS warning light circuit (See page DI-488).
(b) Check the DTC.
(1) Turn the ignition switch ON.
(2) Disconnect the short pin from DLC1.
(3) Using SST, connect terminals Tc and E1 of DLC2 or
DLC1.
SST 09843-18020
(4) Read the DTC from the ABS warning light on the
combination meter.
HINT:
If no code appears, inspect the diagnostic circuit or ABS warn-
ing light circuit (See page DI-494 or DI-488).
As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(5) Codes are explained in the code table on page
DI-447.
(6) After completing the check, disconnect terminals Tc
and E1, and turn off the display.
If 2 or more malfunctions are indicated at the same time, the
lowest numbered DTC will be displayed 1st.
Page 734 of 1807

FI6997
TOYOTA
Hand-held
tester
DLC2
BR3890
R06980
Short Pin
DLC1
N09348
TOYOTA hand-held tester
ECU
TOYOTA brake-out-box
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-443
671 Author: Date:
1997 SUPRA (RM502U)
(c) Using TOYOTA hand-held tester, check the DTC.
(1) Hook up the TOYOTA hand- held tester to the
DLC2.
(2) Read the DTC by following the prompts on the tes-
ter screen.
Please refer to the TOYOTA hand-held tester oper-
ator 's manual for further details.
(d) Clear the DTC.
(1) Using SST, connect terminals Tc and E1 of DLC2 or
DLC1 and remove the short pin from DLC1.
SST 09843-18020
(2) IG switch ON.
(3) Clear the DTC stored in ECU by depressing the
brake pedal 8 or more times within 5 seconds.
(4) Check that the warning light shows the normal
code.
(5) Remove the SST from the terminals of DLC2 or
DLC1.
SST 09843-18020
(6) Connect the short pin to DLC1.
HINT:
Disconnecting the battery cable during repairs will not erase the
DTC in the ECU.
(e) Using TOYOTA brake-out-box and TOYOTA hand-held
tester, measure the ECU terminal values.
(1) Turn the IG switch OFF.
(2) Hook up the TOYOTA hand-held tester and TOYO-
TA break-out-box to the vehicle.
(3) Turn the IG switch ON.
(4) Read the ECU input/output values by following the
prompts on the tester screen.
HINT:
TOYOTA hand-held tester has a ºSnapshotº function.
This records the measured values and is effective in the diagno-
sis of intermittent problems.
Please refer to the TOYOTA hand-held tester/TOYOTA break-
out-box operator's manual for further details.
Page 735 of 1807

F00007
E1
Tc
Ts
lei-23-1-A
DLC1
BR3904
0.13 sec.
0.13 sec.
ON
OFF
BR3893
Malfunction Code (Example Code 72, 76)
7276
ON
OFF
0.5 sec.
0.5 sec.1.5 sec.
0.5 sec.0.5 sec.2.5 sec.
4 sec.
Repeat DI-444
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
672 Author: Date:
1997 SUPRA (RM502U)
2. SPEED SENSOR SIGNAL AND DECELERATION SEN-
SOR
(a) Check the speed sensor signal and deceleration sensor.
(1) Turn the ignition switch OFF
(2) Using SST, connect terminal Ts and E1 of DLC1.
SST 09843-18020
(3) Start the engine.
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS
warning light circuit (See page DI-488).
If the ABS warning light is always on, inspect and repair,
deceleration sensor.
(5) Drive the vehicle faster than 45 km/h (28 mph) for
several seconds.
(6) Stop the vehicle.
(7) Using SST, connect terminals Tc an E1 of DLC1.
SST 09843-18020
(8) Read the number of blinks of the ABS warning light.
HINT:
See the list of DTC shown on the next page.
If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).
If 2 or more malfunctions are indicated at the same time,
the lowest numbered code will be displayed 1st.
(9) After doing the check, disconnect terminals Ts and
E1, Tc and E1 of DLC1, and turn ignition switch OFF.
Page 736 of 1807

FI6997
TOYOTA
Hand-held
tester
DLC2
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-445
673 Author: Date:
1997 SUPRA (RM502U)
(b) Using TOYOTA hand-held tester, check the DTC.
(1) Do step (1) - (6) on the previous page.
(2) Hook up the TOYOTA hand- held tester to the
DLC2.
(3) Read the DTC by following the prompts on the tes-
ter screen.
Please refer to the TOYOTA hand-held tester oper-
ator 's manual for farther details.
DTC of speed sensor check function:
Code No.DiagnosisTrouble Area
71Low output voltage of right front speed sensor
Right front speed sensor
Sensor installation
Sensor Rotor
72Low output voltage of left front speed sensor
Left front speed sensor
Sensor installation
Sensor Rotor
73Low output voltage of right rear speed sensor
Right rear speed sensor
Sensor installation
Sensor Rotor
74Low output voltage of left rear speed sensor
Left rear speed sensor
Sensor installation
Sensor Rotor
75Abnormal change in output voltage of right front speed sensorRight front speed sensor rotor
76Abnormal change in output voltage of left front speed sensorLeft front speed sensor rotor
77Abnormal change in output voltage of right rear speed sensorRight rear speed sensor rotor
78Abnormal change in output voltage of left rear speed sensorLeft rear speed sensor rotor
79*Deceleration sensor is faultyDeceleration sensor
Sensor installation
*: SPORT ABS (2JZ-GTE Engine) only