sensor TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine R14205
Front
1
2
R15781
Rear
2
1
34
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−343
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.6 − 1.8 kΩ
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 MΩ or higher
Rear
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2, 3 and 4 of
speed sensor connector.
OK:
Resistance: 0.6 − 2.05 kΩ
CHECK:
Measure resistance between terminals 1 and 2, 3 and 4 of
speed sensor connector and body ground.
OK:
Resistance: 1 MΩ or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI−321).
OK
2 Check for open and short in harness and connector between each speed sensor
and ECU (See page IN−26).
NG Repair or replace harness or connector.
OK

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R07772
BR3795
OK
NG
DI−344
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
3 Check sensor rotor and sensor installation.
Front
PREPARATION:
Remove the axle hub (See page SA−16 or SA−23).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
Rear
PREPARATION:
Remove the axle shaft (See page SA−131).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
CHECK:
Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and steering
knuckle or rear axle carrier.
NG Replace speed sensor or rotor.
NOTICE:
Check the speed sensor signal last (See page DI−321).
OK
Check and repalce ABS ECU.

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DI−345
1996 TOYOTA T100 (RM449U)
DTC 37 Neither Front Speed Sensor Rotor Missing
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
37
With front wheels stationary and rear wheels rotating at
20+ km/h (12+ mph) for 10+ secs, turn ignition switch ON
then OFF 8 times, in succession.Front axle hub
Right front, left front speed sensor
Wire harness for sensor system
ECU
INSPECTION PROCEDURE
1 Check front axle hub (See page SA−15 or SA−22).
NG Replace front axle hub.
OK
2 Check front speed sensor (See page DI−341).
NG Replace front speed sensor.
OK
3 Check for open or short in harness and connector between speed sensor and
ECU (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.
DI10F−01

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Fuse Box
on J/B No.1
ECU−IG
4WD: Deceleration Sensor R/B
No.2IG SwitchABS ECU
BatteryW−B B−Y
AM1 ALT
IG1
GND
GND W−B
W−B
W
F7 14
6
IC
A15 IA3
W
W
BB
BA15
A15F75
3110
11
24 6
2
5
2
2
2
2 1
W
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−347
1996 TOYOTA T100 (RM449U)
DTC 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the actuators.
DTC No.DTC Detecting ConditionTrouble Area
41
Vehicle speed is 3 km/h (1.9 mph) or more and voltage of
ECU terminal IG1 remains at more than 17 V or below 9.5
V for more than 10 sec.Battery
IC regulator
Open or short in power source circuit
ECU
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
WIRING DIAGRAM
DI10J−01

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− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 43 Malfunction in Deceleration Sensor
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
43
Either of following 1 or 2 is detected:
1. After the battery terminal is connected, input from the
deceleration sensor does not change at one cycle (0
km/h → more than 30 km/h → 0 km/h) for 16 times con-
tinuously.
2. When the brake pedal is not depressed at vehicle speed
of 5 km/h or more, forward and backward G (more than
0.4 G) is detected for 30 seconds or more.
Deceleration sensor
Wire harness for deceleration sensor system
ECU
INSPECTION PROCEDURE
1 Check deceleration sensor (See page DI−321).
NG Replace deceleration sensor.
OK
2 Check for open or short in harness and connector between sensor and ECU
(See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.
DI10K−01

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6
ECU−IGABS ECU
L−W
LG
L
W−B 2 3
Deceleration
SensorA15ABS ECU
GS1
GS2
GST
GGND 19
7
5
18 GS1
GS2
GST IG1
A15
A15
A15 1 A14
A14
A14 A144
A146 5
F7 F7B
B Fuse Box
on J/B No.1
IG Switch
GGND
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−351
1996 TOYOTA T100 (RM449U)
DTC 44 Deceleration Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS control. If the sensor func-
tions abnormally, the ABS warning light comes on but the ABS still operates.
DTC No.DTC Detecting ConditionTrouble Area
44
Either of following 1 or 2 is detected:
1. An open or short is detected in circuit GS1 or GS2 for
1sec.
2. After the ignition is turned ON, test signal is output by
GST. During this time, a trouble signal is detected for 0.5
sec.
Deceleration sensor
Open or short in deceleration sensor circuit
ECU
WIRING DIAGRAM
DI10M−03

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ON
GS2
GST (−)
GS1 (+)
F00012
IG SW
GSTON
OFF
12 V
0 V1.5 sec.
0.5 sec.
DI−352
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check for open and short in harness and connector between Deceleration sen-
sor and ECU (See page IN−26).
NG Repair or replace harness or connector.
OK
2 Check voltage between terminals GS1, GS2, GST of ABS ECU and body ground.
PREPARATION:
(a) Remove the ABS ECU with the connectors still con-
nected.
(b) Disconnect the deceleration sensor connector.
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals GS1, GS2, GST of ECU
and Body ground.
OK:
Voltage:
GS1, GS2: about 5 V
GST: As shown below
NG Check and replace ABS ECU.
OK
Check and replace deceleration sensor.

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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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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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AB0130 AB0045AB0046AB0027
H00320
Airbag Sensor Assembly Connector (Connector ”1”)
Spiral Cable Connector (Connector ”2”)
Short SpringShort Spring
Before Release
After Release After Release Before Release
PaperPaper
Center
Airbag
Sensor
AssemblyJ/B No.1
Squib
RH and LH Front Airbag Sensors Spiral Cable Connector ”1” Connector ”2”
DI−368
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
CAUTION:
Never release the airbag activation prevention mechanism
on the steering wheel pad connector.
NOTICE:
Do not release the airbag activation prevention mech-
anism unless specifically directed by the trouble-
shooting procedure.
If the paper inserted is too thick the terminal and short
spring may be damaged, so always use paper the
same thickness as the male terminal.