1996 TOYOTA T100 engine coolant

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P19559
E7E6
E4
13
1 2 3 4 5 6 7 8 9 10 11
14 15 16 17 18 19 20 21 22 1213 1 2 3 4 5 6 7 8
14 15 16 1213 910 11 1 2 3 4 5 6 7 8 9 10 11
14 15 16 17 18 19 20 21 22 12
23
24 25 26
ECM Terminals
− DIAGNOSTICSENGINE (3RZ−FE)
DI−17
1996 TOYOTA T100 (RM449U)
TERMINALS OF ECM
For M/T
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
BATT (E4−1) − E1 (E7−14)B−G ↔BRAlways9 − 14
+B (E4−12) − E1 (E7−14)W−R ↔ BRIG switch ON9 − 14
VCC (E6−1) − E2 (E6−9)G−Y ↔ BR−BIG switch ON4.5 − 5.5
IDL (E6−12) − E2 (E6−9)Y−L↔BR−B
IG switch ON, Apply vacuum to throttle opener
Throttle valve fully closed0 − 3.0
IG switch ON, Throttle valve fully open9 − 14
VTA (E6−11) − E2 (E6−9)Y↔ BR−B
IG switch ON, Apply vacuum to throttle opener
Throttle valve fully closed0.3 − 0.8
IG switch ON, Throttle valve fully open3.2 − 4.9
VG (E6−2) − E3 (E6−16)Y−R ↔BRIdling, N position, A/C switch OFF1.1 − 1.5
THA (E6−7) − E2 (E6−9)Y−G ↔BR−BIdling, Intake air temp. 20°C (68°F)0.5 − 3.4
THW (E6−4) − E2 (E6−9)G−Y ↔BR−BIdling, Engine coolant temp. 80°C (176°F) 0.2 − 1.0
STA (E4−11) − E1 (E7−14)B−W ↔ BRCranking6.0 or more
#10 (E7−12) − E01 (E7−13)W−R ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−58)
#20 (E7−11) − E01 (E7−13)W ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−58)
IGT (E7−20) − E1 (E7−14)B−L ↔BRIdlingPulse generation
(See page DI−103)
IGF (E7−3) − E1 (E7−14)B−Y ↔BR
IG switch ON, Disconnect igniter connectorBelow 2.0
IdlingPulse generation
(See page DI−103)
G (E7−5) − G− (E7−18)B ↔GIdlingPulse generation
(See page DI−66)
NE (E7−4) − NE− (E7−17)W ↔BIdlingPulse generation
(See page DI−66)
FC (E4−14) − E1 (E7−14)G−Y ↔BRIG switch ON9 − 14
EGR (E7−6) − E1 (E7−14)P ↔BRIG switch ON9 − 14
EVP (E7−23) − E1 (E7−14)W−G ↔ BRIG switch ON9 − 14
RSC (E7−9) − E1 (E7−14)V−Y ↔ BRIG switch ON, Disconnect E7 of ECM connector9 − 14
RSO (E7−10) − E1 (E7−14)V−R ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
OX1 (E6−6) − E1 (E7−14)B ↔BRMaintain engine speed at 2,500 rpm for 2 min. after
warming upPulse generation

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1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 261 2 3 4 5 6 7 8
9 10 11 12 13 14 15 161 2 3 4 5 6
7 8 9 10 11 121 2 3 4 5 6 7 8 9 10 11
14 15 16 17 18 19 20 21 22 1213
E7 E6 E5 E4
ECM Terminals
− DIAGNOSTICSENGINE (3RZ−FE)
DI−19
1996 TOYOTA T100 (RM449U)
For A/T
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
BATT (E4−2) − E1 (E7−24)B−G ↔BRAlways9 − 14
+B (E4−12) − E1 (E7−24)W−R ↔ BRIG switch ON9 − 14
VCC (E6−1) − E2 (E6−9)G−Y ↔ BR−BIG switch ON4.5 − 5.5
IDL (E6−11) − E2 (E6−9)Y−L↔ BR−B
IG switch ON, Apply vacuum to throttle opener
Throttle valve fully closed0 − 3.0
IG switch ON, Throttle valve fully open9 − 14
VTA (E6−10) − E2 (E6−9)Y↔ BR−B
IG switch ON, Apply vacuum to throttle opener
Throttle valve fully closed0.3 − 0.8
IG switch ON, Throttle valve fully open3.2 − 4.9
VG (E6−2) − E3 (E6−3)Y−R ↔BRIdling, A/C switch OFF1.0 − 1.5
THA (E6−12) − E2 (E6−9)Y−G ↔BR−BIdling, Intake air temp. 20°C (68°F)0.5 − 3.4
THW (E6−4) − E2 (E6−9)G−Y ↔BR−BIdling, Engine coolant temp. 80°C (176°F) 0.2 − 1.0
STA (E4−11) − E1 (E7−24)B−W ↔ BRCranking6.0 or more
#10 (E7−12) − E01 (E7−13)W−R ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−58)
#20 (E7−11) − E01 (E7−13)W ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−58)
IGT (E7−23) − E1 (E7−24)B−L ↔BRIdlingPulse generation
(See page DI−103)
IGF (E7−17) − E1 (E7−24)B−Y ↔BR
IG switch ON, Disconnect igniter connectorBelow 2.0
IdlingPulse generation
(See page DI−103)
G (E5−11) − G− (E5−5)B ↔GIdlingPulse generation
(See page DI−66)
NE (E5−12) − NE− (E5−6)W ↔BIdlingPulse generation
(See page DI−66)
FC (E7−14) − E1 (E7−24)G−Y ↔BRIG switch ON9 − 14
EGR (E7−22) − E1 (E7−24)P ↔BRIG switch ON9 − 14
PRG (E5−1) − E1 (E7−24)W−G ↔BRIG switch ON9 − 14
RSC (E7−6) − E1 (E7−24)V−Y ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
RSO (E7−7) − E1 (E7−24)V−R ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
OX1 (E6−5) − E1 (E7−24)B ↔BRMaintain engine speed at 2,500 rpm for 2 min. after
warming upPulse generation

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− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U) FPU (E7−4) − E1 (E7−24)
G ↔ BR
IG switch ON9 − 14
Restarting at high engine
coolant temp.0 − 3
HT1 (E7−3) − E03 (E7−25)P−G ↔BRIdlingBelow 3.0
IG switch ON9 − 14
HT2 (E7−16) − E03 (E7−25)R−G ↔BRIdlingBelow 3.0
IG switch ON9 − 14
KNK (E6−6) − E1 (E7−24)B ↔BRIdlingPulse generation
(See page DI−63)
NSW (E4−22) − E1 (E7−24)B−Y ↔BRIG switch ON, Other shift position in ”P”, ”N” position9 − 14
IG switch ON, Shift position in ”P”, ”N” position0 − 3.0
SP1 (E4−8) − E1 (E7−24)G ↔BRIG switch ON
Rotate driving wheel slowlyPulse generation
(See page DI−92)
TE1 (E6−7) − E1 (E7−14)V−W ↔BRIG switch ON9 − 14
W (E4−4) − E1 (E7−24)V ↔BRIdling9 − 14
IG switch ONBelow 3.0
ACT (E4−6) − E1 (E7−24)L−B ↔BRA/C switch OFF at idling9 − 14
A/C switch ON at idlingBelow 2.0
AC1 (E4−7) − E1 (E7−24)B−R ↔BRA/C switch ON at idlingBelow 2.0
A/C switch OFF idling9 − 14

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Engine Coolant Temp.
Sensor
E6
E64
9ECM
5 V
THW
E2 G−Y
BR−B 2
1E6
E69 4
E1
(M/T) (A/T) (M/T) (A/T)
− DIAGNOSTICSENGINE (3RZ−FE)
DI−33
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−27.
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
DI0TF−03

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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

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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.

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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

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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).