Page 289 of 2062
Downloaded from www.Manualslib.com manuals search engine P23806
P23807
A00045
For A/T For M/T
E3
E3
− DIAGNOSTICSENGINE (3RZ−FE)
DI−25
1996 TOYOTA T100 (RM449U)
4 Check for open and short in harness and connector between mass air flow meter
and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK
Replace mass air flow meter.
5 Check continuity between terminal E3 of ECM connector and body ground.
PREPARATION:
Remove the right cowl side trim (See page MF−50).
CHECK:
Check continuity between terminal E3 of ECM connector and
body ground.
OK:
Continuity (1 Ω or less)
NG Check and replace ECM (See page IN−26).
OK
6 Check for open in harness and connector between mass air flow meter and ECM
(See page IN−26).
NG Repair or replace harness or connector.
OK
Replace mass air flow meter.
Page 290 of 2062
Downloaded from www.Manualslib.com manuals search engine DI−26
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0101 Mass Air Flow Circuit Range/Performance
Problem
CIRCUIT DESCRIPTION
Refer to DTC P0100 on page DI−22.
DTC No.DTC Detecting ConditionTrouble Area
P0101
Conditions (a), (b) and (c) continue with engine speed 900
rpm or less:
(2 trip detection logic)
(a) Closed throttle position switch: ON
(b) Mass air flow meter output > 2.2 V
(c) THW 70°C (158°F)
Mass air flow meter
Conditions (a) and (b) continue with engine speed 1,850 rpm or
more:
(a) VTA 0.75 V
(b) Mass air flow meter output < 1.0 V
WIRING DIAGRAM
Refer to DTC P0110 (Intake Air Temp Circuit Malfunction) on page DI−27 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P0101) being output?
YES Go to relevant DTC chart.
NO
Replace mass air flow meter.
DI0TD−02
Page 291 of 2062

Downloaded from www.Manualslib.com manuals search engine FI4741
(fig.1)
Acceptable
Resistance kΩ
− 20 0 20 40 60 80 100
(− 4) 32 68 104 140 176 212 30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
Temp.°C (F°)
− DIAGNOSTICSENGINE (3RZ−FE)
DI−27
1996 TOYOTA T100 (RM449U)
DTC P0110 Intake Air Temp. Circuit Malfunction
CIRCUIT DESCRIPTION
The intake air temp. sensor is built into the air cleaner cap and
sensors the intake air temp.
A thermistor built in the sensor changes the resistance value
according to the intake air temp. The lower the intake air temp.,
the greater the thermistor resistance value, and the higher the
intake air temp., the lower the thermistor resistance value (See
fig.1).
The intake air temp. sensor is connected to the ECM (See be-
low). The 5 V power source voltage in the ECM is applied to the
intake air temp. sensor from the terminal THA via a resistor R.
That is, the resistor R and the intake air temp. sensor are con-
nected in series. When the resistance value of the intake air
temp. sensor changes in accordance with changes in the intake
air temp., the potential at terminal THA also changes. Based on
this signal, the ECM increases the fuel injection volume to im-
prove driveability during cold engine operation.
If the ECM detects the DTC ”P0110”, it operates the fail safe
function in which the intake air temp. is assumed to be 20°C
(68°F).
DTC No.DTC Detecting ConditionTrouble Area
P0110Open or short in intake air temp. sensor circuit
Open or short in intake air temp. sensor circuit
Intake air temp. sensor
ECM
HINT:
After confirming DTC P110 use the OBD II scan tool or TOYOTA nand−held tester to confirm the intake air
temp. from ”CURRENT DATA”.
Temp. DisplayedMalfunction
− 40°C (− 40°F)Open circuit
140°C (284°F) or moreShort circuit
DI0TE−03
Page 292 of 2062

Downloaded from www.Manualslib.com manuals search engine P19561
Intake Air Temp. Sensor
E6
E67
9ECM
5 V
THA
E2R
Y−G
BR−B 2
1E6
E69 12
E1 (M/T) (A/T) (M/T) (A/T)
DI−28
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
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 intake
air temp.
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 temp. value on the OBD II scan tool or TOYOTA hand−held tester.
OK:
Same as actual intake air temp.
HINT:
If there is open circuit, OBD II scan tool or TOYOTA hand−held tester indicates − 40°C (− 40°F).
If there is short circuit, OBD II scan tool or TOYOTA hand held 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−3).
Page 293 of 2062
Downloaded from www.Manualslib.com manuals search engine BE6653
P19555
A00046
Intake Air Temp.
Sensor
7
1ECM
12
9
E6
E6THA
E25 V
E1
ON
E6
E69 2
(M/T) (A/T)
− DIAGNOSTICSENGINE (3RZ−FE)
DI−29
1996 TOYOTA T100 (RM449U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the intake air 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 intake air temp. sensor.
NG
Page 294 of 2062
Downloaded from www.Manualslib.com manuals search engine BE6653
P19553
P19698
P19673
A00047
Intake Air Temp.
Sensor
12 ON
7
9
9 12
THA E2
THA E2ECM
(M/T) (A/T)THA
E25 V
E1 E6
For M/T
For A/T
E6 E6E6
DI−30
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Connect between terminals THA and E2 of the ECM con-
nector.
HINT:
The intake air temp. sensor connector is disconnected. Before
checking, do a visual and contact pressure check for the ECM
connector (See page DI−3).
(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 THA,
repair or replace harness.
NG
Confirm good connection at ECM.
If OK, replace ECM.
Page 295 of 2062
Downloaded from www.Manualslib.com manuals search engine BE6653
P19554
A00048
Intake Air Temp.
Sensor
7
1ECM
12
9
E6
E6THA
E25 V
E1
ON
E69 2
E6
(M/T)(A/T)
− DIAGNOSTICSENGINE (3RZ−FE)
DI−31
1996 TOYOTA T100 (RM449U)
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the intake air 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 intake air temp. sensor.
NG
Page 296 of 2062
Downloaded from www.Manualslib.com manuals search engine BE6653
FI7056
P19785
P19798
A00049
Intake Air Temp.
SensorON
ECM
THA
E25 V
E1
For M/T
For A/TE6 Connector
E6 Connector
DI−32
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
5 Check for short in harness or ECM.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Disconnect the E6 connector of the ECM.
HINT:
The intake air 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 ).