check engine light TOYOTA T100 1996 Factory Workshop Manual

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− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−331
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC 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 troubleshooting page.
SymptomsInspection CircuitSee page
ABS does not operate.
Only when 1. − 4. are all normal and the problem is still occurring, replace the
ABS ECU.
1. Check the DTC reconfirming that the normal code is output.
2. IG power source circuit.
3. Speed sensor circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page DI−xx).
DI−321
DI−347
DI−341
BR−58
ABS does not operate
efficiently.
Only when 1. − 4. are all normal and the problem is still occurring, replace the
ABS ECU.
1. Check the DTC reconfirming that the normal code is output.
2. Speed sensor circuit.
3. Stop light switch circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page DI−362).
DI−321
DI−341
BR−58
ABS warning light
abnormal.1. ABS warning light circuit.
2. ABS ECU.DI−354
DTC check cannot be done.
Only when 1. and 2. are all normal and the problem is still occurring, replace the
ABS ECU.
1. ABS warning light circuit.
2. Tc terminal circuit.
DI−354
DI−358
Speed sensor signal check
cannot be done.1. Ts terminal circuit.
2. ABS ECU.DI−360

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DI−355
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
Troubleshooting in accordance with the chart below for each trouble symptom.
ABS warning light does not light upGo to step 1
ABS warning light remains onGo to step 3
1 Check ABS warning light.
See Combination Meter Troubleshooting on page BE−2.
NG Repair bulb or combination meter assembly.
OK

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DI−357
1996 TOYOTA T100 (RM449U)
3 Is DTC output?
Check DTC on page DI−321.
YES Repair circuit indicated by code output.
NO
4 Does ABS warning light go off if short pin is removed?
NO Check for short in harness and connector be-
tween warning light, DLC1 and ECU (See page
IN−26).
YES
5 Check ABS control relay (See step 2).
NG Replace ABS control relay.
OK
Check for short in harness and connector between DLC1 and ABS control relay (See page
IN−26).

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BRABS ECU
DLC1
Y−BY−B
EBIE1 A15
E1
3116
20
TcTc
AB0119S08097F00445
ON
E
1
Tc(−)
(+)
DI−358
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting terminals Tc and E1 of the DLC1 causes the ECU to display the DTC by flashing the ABS warning
light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals Tc and E
1 of DLC1.
OK:
Voltage: 10 − 14 V
OK If ABS warning light does not blink even after Tc
and E
1 are connected, ECU may be defective.
NG
DI10U−03

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BRABS ECU
DLC1
R−YR−Y
EBIE1 A15
E1
3161
6
TsTs
AB0119S08096F00446
ON
E
1
Ts(−)
(+)
DI−360
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected with
the DTC check.
Connecting terminals Ts and E
1 of the DLC1 in the engine compartment starts the check.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals Ts and E
1 of DLC1.
OK:
Voltage: 10 − 14 V
OK If ABS warning light does not blink even after Ts
and E
1 are connected, ECU may be defective.
NG
DI10W−03

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Vehicle Brought to Workshop
Identification of Problem
Confirmation Test
END
Repair
Customer Ploblem Analysis
DI−364
DI−365
DI−369
DI−373 Warning Light Check
DTC Check and Recording
Malfunction Code Clearance
DTC Check and Recording
DTC Chart
Circuit Inspection
Malfunction Code Clearance
DTC Check
Step
,:
Diagnostic steps permitting
the use of the TOYOTA
hand−held tester.34
1
2
3
4
5
7
8
9
10
11
12
5,10,1112,,
Symptom Simulation
IN−16
Does Not Light Up
Normal Code
Normal CodeNormal
Code
Malfunction Code
Malfunction Code
6
Normal Code
DI−365
DI−365
DI−365
DI−365
DI−365
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−363
620 Author: Date:
1996 TOYOTA T100 (RM449U)
SUPPLEMENTAL RESTRAINT SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshooting in accordance with the procedure on the following pages.

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Supplemental Restraint System Check Sheet
Date Problem Dist Occurred
Customer ’s Name
Registration No.
Registration Year
Frame No.
Odometer Reading
Weather
Temperature
Vehicle Operation
Road Conditions
Details of Problem
Vehicle Inspection, Repair
History Prior to Occurrence of
Malfunction (Including
Supplemental Restraint System)
Diagnosis System Inspection
SRS Warning Light
Inspection
DTC Inspection1st Time
2nd Time
1st Time
2nd TimeInspector ’s
Name
Fine Cloudy Rainy Snowy Other
Approx.
Starting Idling
Driving [ Constant speed Acceleration Deceleration
Other ]
Remains ON Sometimes Lights Up Does Not Light Up
Remains ON Sometimes Lights Up
Does Not Light Up
Normal Code Malfunction Code
Normal Code Malfunction Code[ Code. ]
[ Code. ]km
Miles //
//
// Date Vehicle Brought In DI−364
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
CUSTOMER PROBLEM ANALYSIS CHECK

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w/ Tachometer
w/o Tachometer
DI0XJ−02
S08098
E1 Tc
AT0716
Normal Code
ON
OFF0.25
0.25
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−365
1996 TOYOTA T100 (RM449U)
PRE−CHECK
1. SRS WARNING LIGHT CHECK
(a) Turn the ignition switch to ACC or ON and check that the
SRS warning light lights up.
(b) Check that the SRS warning light goes out after approx.
6 seconds.
HINT:
When the ignition switch is at ACC or ON and the SRS
warning light remains on or flashes, the airbag sensor as-
sembly has detected a malfunction code.
If, after approx. 6 seconds have elapsed, the SRS warn-
ing light sometimes lights up or the SRS warning light
lights up even when the ignition switch is OFF, a short in
the SRS warning light circuit can be considered likely.
Proceed to ”SRS warning light system malfunction” on
page DI−398, DI−400.
2. DTC CHECK (Using diagnosis check wire)
(a) Output the DTC.
(1) Turn the ignition switch to ACC or ON position and
wait approx. 20 seconds.
(2) Using SST, connect terminals Tc and E1 of the
DLC1.
SST SST 09843−18020
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this will cause a malfunction.
(b) Read the DTC.
Read the 2−digit DTC as indicated by the number of times
the SRS warning light blinks. As an example, the blinking
patterns, normal, 11 and 31 are as shown on the illustra-
tion.
Normal code indication:
The light will blink 2 times per second.
Malfunction code indication:
The first blinking output indicates the first digit
of a 2−digit DTC. After a 1.5 second pause,
the second blinking output will indicate the
second digit.

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− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−369
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below (Proceed to the page given for that circuit.).
DTC No.
(See Page)Detection ItemTrouble AreaSRS
Warning Light
Normal
(DI−396)System normal−OFF
Source voltage dropBattery
Center airbag sensor assemblyON
11
(DI−373)
Short in squib circuit or front airbag
sensor circuit (to ground)Steering wheel pad (D squib)
Front airbag sensor
Spiral cable
Center airbag sensor assembly
Wire harness
ON
12
(DI−379)
Short in squib circuit or front airbag
sensor circuit (to B+)Steering wheel pad (D squib)
Front airbag sensor
Spiral cable
Center airbag sensor assembly
Wire harness
ON
14
(DI−385)
Open in D squib circuitSteering wheel pad (D squib)
Spiral cable
Center airbag sensor assembly
Wire harness
ON
15
(DI−390)Open in front airbag sensor circuitFront airbag sensor
Center airbag sensor assembly
Wire harness
ON
31
(DI−394)
Center airbag sensor assembly
malfunctionCenter airbag sensor assembly
ON
HINT:
When the SRS warning light remains lit up and the DTC is the normal code, this means a source voltage
drop. This malfunction is not stored in memory by the center airbag sensor assembly and if the power
source voltage returns to normal, approx. 10 seconds the SRS warning light will automatically go out.
When 2 or more codes are indicated, the lowest numbered code will apper first.
If a code not listed on the chart is displayed, the center airbag sensor assembly is faulty.

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W02759
43 21
10 9 8 7 56 B A
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−371
1996 TOYOTA T100 (RM449U)
TERMINALS OF ECU
No.SymbolTerminal Name
A−Electrical Connection Check Mechanism
B−Electrical Connection Check Mechanism
1LASRS Warning Light
2D−Squib  (Driver)
3D+Squib  (Driver)
4TCDiagnosis
5E2Ground
6E1Ground
7+SRFront Airbag Sensor RH 
8+SLFront Airbag Sensor LH 
9IG2Power Source (IGN Fuse)
10ACCPower Source (CIG Fuse)