1996 TOYOTA T100 check engine

Downloaded from www.Manualslib.com manuals search engine BE6653
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).

Downloaded from www.Manualslib.com manuals search engine BE6653
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

Downloaded from www.Manualslib.com manuals search engine BE6653
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

Downloaded from www.Manualslib.com manuals search engine BE6653
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).

Downloaded from www.Manualslib.com manuals search engine DI−162
− 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

Downloaded from www.Manualslib.com manuals search engine FI7052
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

Downloaded from www.Manualslib.com manuals search engine A00015
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).

Downloaded from www.Manualslib.com manuals search engine BE6653
P23813
P24316A00108
ON
VCC (+) E2 (−)
VCC (+) E2 (−)
For M/T
For A/T
− DIAGNOSTICSENGINE (5VZ−FE)
DI−167
1996 TOYOTA T100 (RM449U)
5 Check voltage between terminals VCC 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 VCC and E2 of ECM con-
nector.
OK:
Voltage: 4.5 − 5.5 V
NG Check and replace ECM (See page IN−26).
OK
Check for open in harness and connector
between ECM and sensor (VCC line)
(See page IN−26).