TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine BE6653
P24205
P24324A00120
ON
SP1 (+)
SP1 (+)
For M/T
For A/T
AT7809
4 ∼ 6 V
Turn Wheel
− DIAGNOSTICSENGINE (5VZ−FE)
DI−227
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check operation of speedometer.
CHECK:
Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed is operating normally if the speedometer display is normal.
NG Check speedometer and cable
(See page BE−38).
OK
2 Check voltage between terminal SP1 of ECM connector and body ground.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Disconnect the cruise control ECU connector.
(c) Shift the shift lever to neutral.
(d) Jack up the rear wheel on one side.
(e) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal SP1 of ECM connector and
body ground when the wheel is turned slowly.
OK:
Voltage is generated intermittently.
NG Check and repair harness and connector
between combination meter and ECM.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine P01559
Throttle Valve
From
Air
Cleaner
Signal
ECM
ValveIAC Valve
To Cylinders Intake Air Chamber
P19957
ECM
RSC
RSOE01
E01 B−R
BR−R6
7 E7 E7
E7 E7
(M/T)(A/T)
3
1 IAC
Valve
W−R IG Switch FromFrom Battery
R/B No.2EFI Relay
EFI2
IE1
EA1
W−R
9
9
EA
W−R
W−B 2
2
2 3 B−W
22 2
5 1
1 2
2 B−YEA1
W−R
B−Y
4
IGNJ/B
No.11A
1C 3
1722
23 DI−228
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0505 Idle Control System Malfunction
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located in front of the in-
take air chamber and intake air bypassing the throttle valve is
directed to the IAC valve through a passage.
In this way the intake air volume bypassing the throttle valve is
regulated, controlling the engine speed.
The ECM operates only the IAC valve to perform idle−up and
provide feedback for the target idling speed and a VSV for idle−
up control is also added (for air conditioning).
DTC No.DTC Detecting ConditionTrouble Area
P0505Idle speed continues to vary greatly from target speed
(2 trip detection logic)
IAC valve is stuck or closed
Open or short in IAC valve circuit
Open or short in A/C signal circuit
Air intake (hose loose)
WIRING DIAGRAM
DI0V4−01

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P24208
P24325A00121
ON
RSO (+) RSC (+)
RSO (+) RSC (+)
E7 Connector E7 Connector
For M/T
For A/T
− DIAGNOSTICSENGINE (5VZ−FE)
DI−229
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check air induction system (See page SF−1).
NG Repair or replace.
OK
2 Check A/C signal circuit (See page AC−79).
NG Repair or replace.
OK
3 Check voltage terminals RSO and RSC of ECM connector and body ground.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Disconnect the E7 connector of ECM.
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals RSO and RSC of the ECM
connector and body ground.
OK:
Voltage: 9 − 14 V
OK Go to step 5.
NG

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− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
4 Check IAC valve (See page SF−39).
NG Replace IAC valve.
OK
Check for open and short in harness and
connector between R/B No.2 and IAC valve,
IAC valve and ECM (See page IN−26).
5 Check operation of the IAC valve (See page SF−43).
NG Repair or replace IAC valve.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine P19954
− DIAGNOSTICSENGINE (5VZ−FE)
DI−231
1996 TOYOTA T100 (RM449U)
DTC P0510 Closed Throttle Position Switch Malfunction
CIRCUIT DESCRIPTION
Refer to Throttle/ Pedal Position Sensor/ Switch ”A” Circuit Malfunction on page DI−163.
DTC No.DTC Detecting ConditionTrouble Area
P0510The closed throttle position switch does not turn ON even once
when the vehicle is driven (2 trip detection logic)Open in closed throttle position switch circuit
Closed throttle position switch
ECM
HINT:
After confirming DTC P0510 use the TOYOTA hand−held tester to confirm the closed throttle position switch
signal from ”CURRENT DATA”.
Throttle ValveClosed throttle position Switch SignalMalfunction
Fully ClosedOFFOpen Circuit
Fully OpenONShort Circuit
WIRING DIAGRAM
DI9AF−01

Downloaded from www.Manualslib.com manuals search engine A16045
DI−232
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
If DTC ”P0110” (intake air temp. circuit malfunction), ”P0115” (engine coolant temp. circuit malfunction) and
”P0120” (throttle/pedal position sensor/ switch ”A” circuit malfunction) are output simultaneously, E2 (sensor
ground) may be open.
TOYOTA hand−held tester:
1 Check for open in harness or ECM.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Disconnect the throttle position sensor connector.
(c) Connect sensor wire harness terminals between termi-
nals 3 and 4.
(d) Turn ignition switch ON.
CHECK:
Read CTP switch signal on the TOYOTA hand−held tester.
OK:
CTP switch signal: ON
OK Confirm good connection at sensor. If OK, re-
place throttle position sensor.
NG

Downloaded from www.Manualslib.com manuals search engine A16046
− DIAGNOSTICSENGINE (5VZ−FE)
DI−233
1996 TOYOTA T100 (RM449U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Remove right cowl side trim.
(b) Connect between terminals IDL and E2 of ECM connec-
tors.
HINT:
Throttle position sensor connector is disconnected. Before
checking, do a visual check and contact pressure check for the
connector.
(c) Turn ignition switch ON.
CHECK:
Read CTP switch signal on the TOYOTA hand−held tester.
OK:
CTP switch signal: ON
OK Open in harness between ECM and throttle
position sensor, repair or replace harness.
NG
Confirm connection at ECM. If OK, replace
ECM.

Downloaded from www.Manualslib.com manuals search engine A16047
DI−234
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
OBDII scan tool (excluding TOYOTA hand−held tester):
1 Check for open in harness or ECM
PREPARATION:
(a) Disconnect the throttle position sensor connector.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals 3 and 4 of throttle position
sensor connector.
OK:
Voltage: 9 − 14 V
OK Confirm good connection at sensor. If OK, re-
place throttle position sensor.
NG
2 Check for open in harness and connector between throttle position sensor and
ECM (See page IN−26).
NG Open in harness between ECM and throttle
position sensor.
OK
Confirm connection at ECM. If OK, replace
ECM.

Downloaded from www.Manualslib.com manuals search engine S00251
From BatteryIgnition Coil
Spark Plug
IGC1
IGC2
IGC3
GND TA C IGT1
IGT2
IGT3
IGF
To Tachometer ECM G
NE
Camshaft
Position
Sensor
Crankshaft
Position
Sensor
Various
SensorNo.1 Cylinder
No.4 Cylinder
No.5 Cylinder
No.2 Cylinder
No.3 Cylinder
No.6 Cylinder
− DIAGNOSTICSENGINE (5VZ−FE)
DI−235
1996 TOYOTA T100 (RM449U)
DTC P1300 Igniter Circuit Malfunction
CIRCUIT DESCRIPTION
A DIS (Direct Ignition System) has been adopted. The DIS improves the ignition timing accuracy, reduces
high−voltage loss, and enhances the overall reliability of the ignition system by eliminating the distributor.
The DIS is a 2−cylinder simultaneous ignition system which ignites 2 cylinders simultaneously with one igni-
tion coil. In the 2−cylinder simultaneous ignition system, each of the 2 spark plugs is connected to the end
of the secondary winding. High voltage generated in the secondary winding is applied directly to the spark
plugs. The sparks of the 2 spark plugs pass simultaneously from the center electrode to the ground elec-
trode.
The ECM determines ignition timing end outputs the ignition signals (IGT) for each cylinder. Based on IGT
signals, the igniter controls the primary ignition signals (IGC) for all ignition coils. At the same time, the igniter
also sends an ignition confirmation signal (IGF) as a fail−safe measure to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300
No IGF signal to ECM for 6 consecutively IGT signals during
engine runningOpen or short in IGF or IGT circuit from igniter to ECM
Igniter
ECM
DI0V5−01

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Battery W−R
W−R R−L WAM2
2
24
3R/B 8
IA3Switch IG
B−R
IE1
B−L
BR−B
B−W
B−Y
BRInjector
No.1
No.2
No.3
EB
8B−R
714
No.2Spark
PlugB−RB−RECM
Ignition
Coil
B−R
BR−Y
BR−W
B−R
B−R
B−W
2 1
2 1
2 1
10
2
1
3
8 4 5 6 7 9
To
Tachometer
(M/T)(A/T)
E7 E7
E7 E7
E7 E7
E7 E7IGT1 23 24
22 25
21 26
17 12IGT2
IGT3
IGF5 V
DI−236
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check spark plug (See page IG−1).
NG Go to step 4.
OK