TOYOTA T100 1996 Factory Service Manual

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− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−317
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check if the stop lights go on and off normally when the brake pedal is operated and released.
NG Check and repair stop light circuit.
OK
2 Check STP signal.
When using OBD II scan tool or TOYOTA hand−held tester:
PREPARATION:
(a) Connect an OBD II scan tool or TOYOTA hand−held tes-
ter to the DLC3.
(b) Turn the ignition switch ON and OBD II scan tool or TOY-
OTA hand−held tester main switch ON.
CHECK:
Read the STP signal on the TOYOTA hand−held tester.
OK:
Brake PedalSTP Signal
DepressedON
ReleaseOFF
When not using OBD II scan tool or TOYOTA hand−held tes-
ter:
PREPARATION:
Turn the ignition switch ON.
CHECK:
Check the voltage between terminal B/K of the ECM connector
and body ground.
OK:
Brake PedalVoltage
Depressed7.5 − 14 V
ReleaseBelow 1.5 V

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− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−282).
NG
3 Check harness and connector between stop light switch and ECM (See page
IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM.

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Vehicle Brought to Workshop
Customer Problem Analysis
P. DI−320
Check and Clear DTC (Precheck)
P.
DI−321
Items 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−16
Symptom
does not occur
Symptom
occurs
DTC Check
P. DI−321
Sensor CheckCircuit Inspection
P. DI−332 ∼ DI−360
DTC Chart
P. DI−326 Malfunction codeProblem Symptoms Table
P. DI−331
Check for Fluid Leakage
P. DI−362
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
67
89
10
11
Step 8 :Diagnostic steps permitting the use of the
TOYOTA hand−held tester or TOYOTA
break−out−box.
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−319
576 Author: Date:
1996 TOYOTA T100 (RM449U)
ANTI−LOCK BRAKE SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoooting in accordance with the procedure on the following pages.

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ABS Check SheetInspector ’s
Name:
Customer ’s Name
Date Vehicle
Brought InRegistration YearRegistration No.
Frame No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
ABS does not operate.
ABS does not operate efficiently.
ABS Warning Light
AbnormalRemains ONDoes not Light Up
DTC Check1st Time
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
Symptomskm
miles DI−320
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
CUSTOMER PROBLEM ANALYSIS CHECK

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DI0ZM−03
A00778DLC1 E
1Tc
F00006
DLC1Short Pin
R01346
Normal Code
0.25 sec.
0.25 sec. 2 sec.
ON
OFF
ON
OFF0.5 sec.0.5 sec.
Code 11 and 21
4 sec.1.5 sec.
2.5 sec.
Code 11 Code 21
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−321
1996 TOYOTA T100 (RM449U)
PRE−CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator light.
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−354).
(b) Check the DTC.
(1) Using SST, connect terminals Tc and E
1 of the
DLC1.
SST 09843−18020
(2) Disconnect the short pin from the DLC1.
(3) Turn the ignition switch ON.
(4) Read the DTC from the ABS warning light on the
combination meter.
HINT:
If no code appears, inspect the diagnostic circuit or ABS
warning light circuit (See page DI−354 or DI−358).
As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(5) Code are explained in the code table on page
DI−326.
(6) After completing the check, disconnect terminals Tc
and E
1, and turn off the display.
If 2 or more malfunctions are indicated at the same time the low-
est numbered DTC will be displayed 1st.

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F00006DLC1Short Pin
N09348
TOYOTA
hand−held tester
TOYOTA
brake−out−box ECU
A00778DLC1 E
1Tc
Ts DI−322
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
(c) Clear the DTC.
(1) Using SST, connect terminals Tc and E
1 of the
DLC1 and remove the short pin from the DLC1.
SST 09843−18020
(2) Turn the ignition switch ON.
(3) Clear the DTC stored in ECU by depressing the
brake pedal 8 or more times within 3 seconds.
(4) Check that the warning light shows the normal
code.
(5) Remove the SST from the terminals of the DLC1.
SST 09843−18020
(6) Connect the short pin to the DLC1.
HINT:
Cancellation can also be done by removing the ECU−B fuse,
but in this case, other memory systems will also be cancelled
out.
(d) Using TOYOTA brake−out−box and TOYOTA hand−held
tester, measure the ECU terminal value.
(1) Hook up the TOYOTA hand−held tester and
TOYOTA break−out−box to the vehicle.
(2) Read the ECU input/output values by following the
prompts on the tester screen.
HINT:
TOYOTA hand−held tester has a ”Snapshot” function. This re-
cords the measured values and is effective in the diagnosis of
intermittent problems.
Please refer to the TOYOTA hand−held tester/TOYOTA break−
out−box operator’s manual for further details.
2. SPEED SENSOR SIGNAL AND DECELERATION SEN-
SOR CHECK
(a) Check the speed sensor signal.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and E
1 of the
DLC1.
SST 09843−18020
(3) Start the engine.

Downloaded from www.Manualslib.com manuals search engine BR3904
0.13 sec. 0.13 sec.
ON
OFF
BR3893
Malfunction Code (Example Code 72, 76)
7
26
7
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec. 2.5 sec.4 sec.
Repeat
A00778DLC1 E
1
Ts
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−323
1996 TOYOTA T100 (RM449U)
(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−354).
(5) Drive vehicle straight forward.
HINT:
Drive vehicle faster than 45 km/h (28 mph) for several seconds.
(6) Stop the vehicle.
(7) Using SST, connect terminals Tc and E
1 of the
DLC1.
SST 09843−18020
(8) Read the number of blinks of the ABS warning light.
HINT:
See the list of DTC on page DI−326.
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 malfunction are indicated at the same time,
the lowest numbered code will be displayed 1st.
(9) After doing the check, disconnect terminals Ts and
E
1, Tc and E1 of the DLC1, and ignition switch
turned OFF.
(b) Check the deceleration sensor detection point.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and E
1 of the
DLC1.
SST 09843−18020
(3) Start the engine.

Downloaded from www.Manualslib.com manuals search engine R05599
0.13 sec.
0.13 sec. 3 sec. ON
OFF
R12881
1,100 ± 30 mm
(43.31 ± 1.18 in.)
R12882
830 ± 30 mm
(32.68 ± 1.18 in.)
BR1865
0.13 sec.
0.13 sec. ON
OFF
R05596
0.13 sec. Braking0.13 sec. DI−324
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
(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−354).
(5) Jack up the rear side of the vehicle slowly.
HINT:
When measuring the height, measure at the center of the lower
body of the vehicle.
(6) Check that the warning light blinks.
If the warning light turns on, inspect the deceleration sensor
installation. If the sensor installation is OK, replace the decel-
eration sensor.
(7) Jack down the vehicle slowly.
(8) Jack up the front side of the vehicle slowly, as
shown.
HINT:
When measuring the height, measure at the center of the lower
body of the vehicle.
(9) Check that the warning light blinks.
If the warning light turns on, inspect the deceleration sensor
installation. If the sensor installation is OK, replace the decel-
eration sensor.
(10) Jack down the vehicle slowly.
(c) Check the deceleration sensor operation.
(1) Drive the vehicle straight ahead at about 20 km/h
(12.4 mph) or more, lightly depress the brake pedal.
(2) Check that there is no change in the warning light
pattern.
(3) Drive the vehicle straight ahead at about 20 km/h
(12.4 mph) or more, and depress the brake pedal
moderately.
(4) Check that the warning light turns on while braking.

Downloaded from www.Manualslib.com manuals search engine R05597
0.13 sec. 0.13 sec.
Braking
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−325
1996 TOYOTA T100 (RM449U)
(5) Drive the vehicle straight ahead at about 20 km/h
(12.4 mph) or more, and depress the brake pedal
strongly.
(6) Check that the warning light pattern changes while
braking, as shown.
If the operation is not as specified, inspect the deceleration sen-
sor installation. If the sensor installation is OK, replace the de-
celeration sensor.
(7) Stop the vehicle and turn the ignition switch OFF.
(8) Remove the SST from the terminals of the DLC1.
SST 09843−18020
(d) Check the DTC of the speed sensor function.
Code No.DiagnosisTrouble Area
71Low output voltage of right front speed sensorRight front speed sensor
Sensor installation
72Low output voltage of left front speed sensorLeft front speed sensor
Sensor installation
73Low output voltage of right rear speed sensorRight rear speed sensor
Sensor installation
74Low output voltage of left rear speed sensorLeft rear speed sensor
Sensor installation
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
*: 4WD models

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DI−326
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843−18020, connect terminals Tc and E
1, and remove the short pin.
If a malfunction code is displayed during the DTC check, check the circuit listed that the code. For details
of each code, turn to the page referred to under the ”See Page” for respective ”DTC No.” in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI−332)Open circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
Open or short in ABS control (solenoid) relay circuit
ECU
12
(DI−332)Short circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
B+ short in ABS control (solenoid) relay circuit
ECU
13
(DI−335)Open circuit in ABS control (motor) relay circuit
ABS control (motor) relay
Open or short in ABS control (motor) relay circuit
ECU
14
(DI−335)Short circuit in ABS control (motor) relay circuit
ABS control (motor) relay
B+ short in ABS control (motor) relay circuit
ECU
21
(DI−338)Open or short circuit in 2−position solenoid circuit for right front
wheelABS actuator
Open or short in SFRR or SFRH circuit
ECU
22
(DI−338)Open or short circuit in 2−position solenoid circuit for left front
wheelABS actuator
Open or short in SFLR or SFLH circuit
ECU
23
(DI−338)Open or short circuit in 2−position solenoid circuit for rear
wheelABS actuator
Open or short in SRR or SRH circuit
ECU
31
(DI−341)Right front wheel speed sensor signal malfunction
Right front, left front, right rear and left rear speed sensor
Open or short in each speed sensor circuit
ECU
32
(DI−341)Left front wheel speed sensor signal malfunction
33
(DI−341)Right rear wheel speed sensor signal malfunction
34
(DI−341)Left rear wheel speed sensor signal malfunction
35
(DI−341)Open circuit in left front or right rear wheel speed sensor.
36
(DI−341)Open circuit in right front or left rear wheel speed sensor.
37
(DI−345)Neither front speed sensor rotor missing
Front axle hub
Right front, left front speed sensor
Wire harness for sensor system
ECU
37
(DI−346)Some tire is different size from the other tiresTire size
ECU
41
(DI−347)Low battery positive voltage or abnormally high battery
positive voltage
Battery
IC regulator
Open or short in power source circuit
ECU