TOYOTA T100 1996 Factory Service Manual

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P19554
A00048
ON
Intake Air
Temp. SensorECM
3
4
5 V
E2
12 14
922
E1
(A/T) (M/T)THA
E6
E6E6
E6
BE6653
FI7056
P19798
FI7034
A00103
ON
ECM Intake Air
Temp. Sensor
E2
E1
THA5 V
E6 Connector
E6 Connector
For M/T
For A/T
− DIAGNOSTICSENGINE (5VZ−FE)
DI−157
1996 TOYOTA T100 (RM449U)
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the mass air flow meter connector.
(b) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: − 40°C (− 40°F)
OK Replace mass air flow meter.
NG
5 Check for short in harness or ECM.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Disconnect the E6 connector of the ECM.
HINT:
The mass air flow meter connector is disconnected.
(c) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: − 40°C (− 40°F)
OK Repair or replace harness or connector.
NG
Check and replace ECM (See page IN−26).

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ECM
5 V
THW
E2 Engine Coolant Temp. Sensor
2
12
1 G−YG−Y
BR−BBR−B420
922
E1
(M/T)(A/T)E6E6
EC2
E6E6 EC2 DI−158
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0115 Engine Coolant Temp. Circuit Malfunction
CIRCUIT DESCRIPTION
A thermistor built into the engine coolant temp. sensor changes the resistance value according to the engine
coolant temp.
The structure of the sensor and connection to the ECM is the same as in the intake air temp. circuit malfunc-
tion shown on page DI−154.
If the ECM detects the DTC P0115, it operates the fail safe function in which the engine coolant temp. is
assumed to be 80°C (176°F).
DTC No.Detection ItemTrouble Area
P0115Open or short in engine coolant temp. sensor circuit
Open or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
HINT:
After confirming DTC P0115 use the OBD II scan tool or TOYOTA hand−held tester to confirm the engine
coolant temp. from ”CURRENT DATA”.
Temp. DisplayedMalfunction
− 40°C (− 40°F)Open circuit
140°C (284°F) or moreShort circuit
WIRING DIAGRAM
DI0UJ−01

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P19555
A00046
ON
Engine Coolant
Temp. SensorECM
2
1
420
922
E2
E1 THW5 V
(A/T)
(M/T)E6
E6 E6E6
− DIAGNOSTICSENGINE (5VZ−FE)
DI−159
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
If DTCs P0110, P0115 and P0120 are output simultaneously, E2 (sensor ground) may be open.
1 Connect OBD II scan tool or TOYOTA hand−held tester and read value of
engine coolant temp.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand−held tester main switch
ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA hand−held tester.
OK:
Same as actual engine coolant temp.
HINT:
If there is open circuit, OBD II scan tool or TOYOTA hand−held tester indicates − 40°C (− 40°F).
If there is open circuit, OBD II scan tool or TOYOTA handheld tester indicates 140°C (284°F) or more.
NG − 40°C (− 40°F) ... Go to step 2.
140°C (284°F) or more ... Go to step 4.
OK
Check for intermittent problems
(See page DI−129).
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the engine coolant temp. sensor connector.
(b) Connect the sensor wire harness terminals together.
(c) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: 140°C (284°F) or more
OK Confirm good connection at sensor.
If OK, replace engine coolant temp. sensor.
NG

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P19553
P20224
P20200A00104
ON
Engine Coolant
Temp. Sensor
2
1ECM
THW E2
THW E2
5 V
E2
E1420
922THW
E6 E6
E6 E6
(A/T) (M/T)
For M/T
For A/T
BE6653
P19554
A00048
ON
Engine Coolant
Temp. Sensor
2
1
420
922
5 V
E2
E1 THW
ECM
(A/T) (M/T)E6
E6
E6
E6
DI−160
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Connect between terminals THW and E2 of the ECM con-
nector.
HINT:
The engine coolant temp. sensor connector is disconnected.
Before checking, do a visual and contact pressure check for the
ECM connector (See page IN−26).
(c) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: 140°C (284°F) or more
OK Open in harness between terminals E2 or THW,
repair or replace harness.
NG
Confirm good connection at ECM.
If OK, check and replace ECM.
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the engine coolant temp. sensor connector.
(b) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: − 40°C (− 40°F)
OK Replace engine coolant temp. sensor.
NG

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FI7056
P19798
FI7034
A00103
ON
ECM
Engine Coolant
Temp. Sensor
E2
E1
THW
E6 Connector
E6 Connector
For M/T
For A/T
5 V
− DIAGNOSTICSENGINE (5VZ−FE)
DI−161
1996 TOYOTA T100 (RM449U)
5 Check for short in harness or ECM.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61 ).
(b) Disconnect the E6 connector of the ECM.
HINT:
The engine coolant temp. sensor connector is disconnected.
(c) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: − 40°C (− 40°F)
OK Repair or replace harness or connector.
NG
Check and replace ECM (See page IN−26).

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− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0116 Engine Coolant Temp. Circuit Range/
Performance problem
CIRCUIT DESCRIPTION
Refer to DTC P0115 on page DI−158.
DTC No.DTC Detecting ConditionTrouble Area
P0116
If THW − 7°C (19.4°F) at engine start, 20 min. or more
after starting engine, engine coolant temp. sensor value is
35°C (95°F) or less
(2 trip detection logic)
Engine coolant temp. sensor
Cooling system
If THW − 7°C (19.4°F) at engine start, 5 min. or more
after starting engine, engine coolant temp. sensor value is
35°C (95°F) or less
(2 trip detection logic)
INSPECTION PROCEDURE
HINT:
If DTCs P0115 and P0116 are output simultaneously, engine coolant temp. sensor circuit may be open.Per-
form troubleshooting of DTC P0115 first.
1 Are there any other codes (besides DTC P0116) being output?
YES Go to relevant DTC chart.
NO
2 Check thermostat (See page CO−9).
NG Replace thermostat.
OK
Replace engine coolant temp. sensor.
DI0UK−01

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ECM
Throttle Position
Sensor
VCC
VTA
E2
− DIAGNOSTICSENGINE (5VZ−FE)
DI−163
1996 TOYOTA T100 (RM449U)
DTC P0120 Throttle/Pedal position Sensor/Switch ”A”
Circuit Malfunction
CIRCUIT DESCRIPTION
The throttle position sensor is mounted in the throttle body and
detects the throttle valve opening angle. When the throttle valve
is fully closed, a voltage of approximately 0.7 V is applied to ter-
minal VTA of the ECM. The voltage applied to the terminals VTA
of the ECM increases in proportion to the opening angle of the
throttle valve and becomes approximately 2.7 ∼ 5.2 V when the
throttle valve is fully opened. The ECM judges the vehicle driv-
ing conditions from these signals input from terminals VTA and
uses them as one of the conditions for deciding the air−fuel ratio
correction, power increase correction and fuel−cut control etc.
DTC No.DTC Detecting ConditionTrouble Area
P0120
Condition (a) or (b) continues:
(a) VTA
0.1 V
(b) VTA
4.9 V
Open or short in throttle position sensor circuit
Throttle position sensor
ECM
HINT:
After confirming DTC P0120 use the OBD II scan tool or TOYOTA hand−held tester to confirm the throttle
valve opening percentage and closed throttle position switch condition.
Throttle valve opening position
expressed as percentageTrouble Area
Throttle valve fully closedThrottle valve fully openTrouble Area
0 %0 %VCC line open
VTA line open or short
Approx. 99 %Approx. 100 %E2 line open
DI0UL−01

Downloaded from www.Manualslib.com manuals search engine A00004
ECM
5 V
VCC
VTA
E2 2
3
1 Throttle Position Sensor
E6E6
E6E6
E6
E6 1
10
91
7
22 G−B
Y−B
BR−B
(M/T) (A/T) DI−164
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM

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BE6653
A00014A00106
2 (+) ON
− DIAGNOSTICSENGINE (5VZ−FE)
DI−165
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
If DTCs P0110, P0115 and P0120 are output simultaneously, E2 (sensor ground) may be open. If DTCs
P0110, P0115 and P0120 are output simultaneously, E2 (sensor ground) may be open.
1 Connect OBD II scan tool or TOYOTA hand−held tester and read the throttle
valve opening percentage.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand−held tester to DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand−held tester main switch
ON.
CHECK:
Read the throttle valve opening percentage.
OK:
Throttle valveThrottle valve opening position
expressed as percentage
Fully openApprox. 75 %
Fully closedApprox. 10 %
OK Check for intermittent problems
(See page DI−129).
NG
2 Check voltage between terminal 2 of wire harness side connector and body
ground.
PREPARATION:
(a) Disconnect the throttle position sensor connector.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals 2 of wire harness side con-
nector and body ground.
OK:
Voltage: 4.5 − 5.5 V
NG Go to step 5.
OK

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Throttle Position
Sensor1
2
3
BE6653
P23811
P24315
A00107
ON
VTA (+) E2 (−)
VTA (+) E2 (−)
For M/T
For A/T
DI−166
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
3 Check throttle position sensor.
PREPARATION:
Disconnect the throttle position sensor connector.
CHECK:
Measure voltage between terminals 1, 2 and 3 of throttle posi-
tion sensor.
OK:
TerminalsThrottle valveResistance
1 − 2⎯2.5 − 5.9 kΩ
1 − 3Fully closed0.2 − 5.7 kΩ
Fully open2.0 − 10.2 kΩ
NG Replace throttle position sensor.
OK
4 Check voltage between terminals VTA and E2 of ECM.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals VTA and E2 of ECM con-
nector.
OK:
Throttle valveVoltage
Fully closed1.0 V
Fully open2.72 ∼ 5.2 V
NG Check for open and short in harness and
connector between ECM and throttle position
sensor (VTA line) (See page IN−26).
OK
Check and replace ECM (See page IN−26).