check engine TOYOTA T100 1996 Factory Repair Manual

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 ).

Downloaded from www.Manualslib.com manuals search engine BE6653
P19555
A00046
Engine Coolant
Temp. Sensor
1ECM
E6THW
E25 V
E1
ON
E6
2
(M/T) (A/T)E6 E6
44
99
DI−34
− DIAGNOSTICSENGINE (3RZ−FE)
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−3).
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
P19699
P19674
A00050
12 ON
4
THW E2
THW E2ECM(M/T) (A/T)THW
E25 V
E1 E6
For M/T
For A/T
E6E6
Engine Coolant
Temp. Sensor
E694
9
− DIAGNOSTICSENGINE (3RZ−FE)
DI−35
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 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 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 THW,
repair or replace harness.
NG
Confirm good connection at ECM.
If OK, replace ECM.

Downloaded from www.Manualslib.com manuals search engine BE6653
P19554
A00048
12 ON
4ECM
THW
E25 V
E1 E6 E6
Engine Coolant
Temp. Sensor
4
9
E6 E69
(M/T)(A/T)
DI−36
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
4 Check for open in harness or 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
P19785
P19798
A00049
ON
THW
E2
For M/T
For A/T Engine Coolant
Temp. Sensor
E15 V
E6 Connector
E6 Connector
ECM
− DIAGNOSTICSENGINE (3RZ−FE)
DI−37
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 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−38
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0116 Engine Coolant Temp. Circuit Range/
Performance Problem
CIRCUIT DESCRIPTION
Refer to DTC P0115 on page DI−33.
DTC No.DTC Detecting ConditionTrouble Area
P0116
When engine starts, water temp. is − 7°C (20°F) or less
And, 20 min. or more after engine starts, engine coolant
temp. sensor value is 20°C (68°F) or less
(2 trip detection logic)
Engine coolant temp. sensor
Cooling system
When engine starts, water temp. is between − 7°C (19.4°F)
and 10°C (50°F)
And, 5 min. or more after engine starts, engine coolant temp.
sensor value is 20°C (68°F) or less
(2 trip detection logic)
When engine starts, water temp. is 10°C (50°F) or more
And, 2 min. or more after engine starts, engine coolant temp.
sensor value is 20°C (68°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.
Perform 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 (See
page MF−45).
DI0TG−03

Downloaded from www.Manualslib.com manuals search engine P19610
Throttle Position Sensor
G−Y
11
2
3
4Y−L
BR−B Y1
E6 E6
E6 E6
E6 E6
E6 E611 1 0
12
11
995 V
B+ VCC
VTA
IDL
E2
E1 (M/T) (A/T)
* Closed Throttle
Position Switch *
FI7052
DI−40
− 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 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−3).

Downloaded from www.Manualslib.com manuals search engine BE6653
P23808
A00051
ON
1 (+)
P23809
Throttle Position
Sensor
1
2
4
− DIAGNOSTICSENGINE (3RZ−FE)
DI−41
1996 TOYOTA T100 (RM449U)
NG
2 Check voltage between terminal 1 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 1 of wire harness side con-
nector and body ground.
OK:
Voltage: 4.5 − 5.5 V
NG Go to step 5.
OK
3 Check throttle position sensor.
PREPARATION:
Disconnect the throttle position sensor connector.
CHECK:
Measure voltage between terminals 1, 2 and 4 of throttle posi-
tion sensor.
OK:
TerminalsThrottle valveResistance
1 − 4⎯2.5 − 5.9 kΩ
2 − 4Fully closed0.2 − 5.7 kΩ
2 − 4Fully open2.0 − 10.2 kΩ
NG Replace throttle position sensor.
OK

Downloaded from www.Manualslib.com manuals search engine BE6653
P23810
P23811
A00052
For M/TON
For A/TVTA (+) E2 (−)
VTA (+) E2 (−)
BE6653
P23812
P23813A00028
For M/TON
For A/TVCC (+)
VCC (+) E2 (−) E2 (−)
DI−42
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
4 Check voltage between terminals VTA and E2 of ECM connector.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals VTA and E2 of ECM con-
nector.
OK:
Throttle valveVoltage
Fully closed0.3 − 0.8 V
Fully open2.7 − 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).
5 Check voltage between terminals VCC and E2 of ECM connector.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(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 be-
tween ECM and sensor (VCC line) (See page
IN−26).

Downloaded from www.Manualslib.com manuals search engine P19611
R/B No.2
B−W
22E6 E6
E6
E6
BRE1 E1
EB
2
2
22
From Battery From
IG Switch
EFI RelayW−R
EFI2
1 5 13EA1
IE1 W−RW−RW−R 9
9
W−R
Heated
Oxygen
Sensor
(Bank 1
Sensor 2)2
13
423
14Heated
Oxygen
Sensor
(Bank 1
Sensor 1)
P−G
E7 E7
E7 E7
E7 E7 R−G WECM
OX1
HT1
OX2
E1
HT2E03
E03 (M/T)(A/T)6
2
5
14
155
3
13
24
16 B
To Body Ground
− DIAGNOSTICSENGINE (3RZ−FE)
DI−45
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Connect OBD II scan tool or TOYOTA hand−held tester and read value for volt-
age output of heated oxygen sensor (Bank 1 sensor 1).
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand−held tester to the DLC3.
(b) Warm up the engine to normal operating temp.
CHECK:
Read voltage output of heated oxygen sensor (bank 1 sensor 1) when engine is suddenly raced.
HINT:
Perform quick racing to 4,000 rpm 3 times using the accelerator pedal.
OK:
Heated oxygen sensor (bank 1 sensor 1) output a RICH signal (0.45 V or more) at least once
OK Check and replace ECM (See page IN−26).
NG