1996 TOYOTA T100 relay

Downloaded from www.Manualslib.com manuals search engine A00652
ECM VSV for EVAP
Throttle
Valve
Fuel Tank Charcoal
CanisterFig 1
A00647
IG Switch
(M/T)(A/T)
23W−G
2
1
EFI
EFI Relay
VSV for
ECM From From
Battery
22
2
2
223 2
E7 E5
EA
W−B
IE2W−G1 R/B No.2
PRG
E01 4EVAP5
EA1
W−RW−R
921
B−W
DI−88
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0441 Evaporative Emission Control System
Incorrect Purge Flow
CIRCUIT DESCRIPTION
To reduce HC emissions, evaporated fuel from the fuel tank is
routed through the charcoal canister to the intake manifold for
combustion in the cylinders.
The ECM changes the duty signal to the VSV for EVAP so that
the intake quantity of HC emissions is appropriate for the driving
conditions (engine load, engine speed, vehicle speed, etc.) af-
ter the engine is warmed up.
DTC No.DTC Detecting ConditionTrouble Area
P0441Proper response to computer command does not occur
(2 trip detection logic)
Open or short in VSV circuit for EVAP
VSV for EVAP
ECM
Vacuum hose cracks, hole, blocked, damaged or
disconnected
Charcoal canister
WIRING DIAGRAM
DI0TX−03

Downloaded from www.Manualslib.com manuals search engine BE6653
FI7205 FI7206
A00071
VSV is ON VSV is OFFON
Air
E
FAir
EF
− DIAGNOSTICSENGINE (3RZ−FE)
DI−89
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
TOYOTA hand−held tester:
1 Connect TOYOTA hand−held tester and check operation of VSV for EVAP.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and TOYOTA hand−held tes-
ter main switch ON.
(c) Select the ”ACTIVE TEST” mode on the TOYOTA hand−
held tester.
CHECK:
Check operation of VSV when it is operated by the TOYOTA
hand−held tester.
OK:
(1) VSV is ON:
Air flows from port E to port F.
(2) VSV is OFF:
Air does not flow from port E to port F.
OK Go to step 4.
NG
2 Check operation of VSV for EVAP (See page MF−44).
NG Replace VSV for EVAP.
OK
3 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine P01559
Throttle Valve
To Cylinder ECM
Signal
From
Air
Cleaner
Valve
IAC Valve
Intake Air
Chamber
P19957
ECM
RSC
RSOE01
E01 V−Y
V−R96
10 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 B−W
22
15 2
2
B−Y
EA1
W−R
B−Y
4
IGN
J/B
No.11A
1C 3
17
3 DI−94
− DIAGNOSTICSENGINE (3RZ−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.
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
Air intake (hose loose)
WIRING DIAGRAM
DI0TZ−03

Downloaded from www.Manualslib.com manuals search engine P19741
ECM
STA
E1 E4
(M/T) (A/T)
11
E4 11
B−R
Starter IE1
B−R
B−RB−R B−R (M/T)
21 35
Starter
Relay 1
2
W−B (A/T)
IC
B (A/T) W
Park/Neutral
Position Switch
15
B
5
6 B−Y 22
IA3
AM1
W
ALT
BatteryR/B No. 2W−B (M/T)
Clutch
Start
SwtichIE1
B (M/T) B−Y
6 3 W
W
W
14IE1
2
2
2
2
W
DI−11 0
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1500 Starter Signal Circuit Malfunction
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporazation is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery voltage is ap-
plied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection volume for
the starting injection control and after−start injection control.
DTC No.DTC Detecting ConditionTrouble Area
P1500No starter signal to ECM
Open or short in starter signal circuit
Open or short in ignition swtich or starter relay circuit
ECM
HINT:
In this circuit, diagnosis can only be made in the check mode.
WIRING DIAGRAM
DI984−01

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (3RZ−FE)
DI−111
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
This inspection procedure is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the matrix chart of problem symptoms on page DI−21.
1 Connect the TOYOTA hand−held tester and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and TOYOTA hand−held tester main switch ON.
CHECK:
Read STA signal on the TOYOTA hand−held tester while starter operates.
OK:
Ignition switch positionONSTART
STA signalOFFON
OK Proceed to next circuit inspection shown on
matrix chart (See page DI−21)
NG
2 Check for open in harness and connector between ECM and starter relay
(See page IN−26).
NG Repair or replace harness and sconnector.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine DI−11 4
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1780 Park/Neutral Position Switch Malfunction
(A/T Only)
CIRCUIT DESCRIPTION
The park/neutral position switch goes on when the shift lever is in the N or P shift position. When it goes on
terminal NSW of the ECM is grounded to body ground via the starter relay, thus the terminal NSW voltage
becomes 0 V. When the shift lever is in the D, 2, L, or R position, the park/neutral position switch goes off,
so the voltage of ECM. Terminal NSW becomes battery positive voltage, the voltage of the ECM internal
power source. If the shift lever is moved from the N position to the D position, this signal is used for air−fuel
ratio correction and for idle speed control (estimated control), etc.
DTC No.DTC Detecting ConditionTrouble Area
P1780
2 or more switches are ON simultaneously for ”N”, ”2” and
”L” position
(2 trip detection logic)
Short in park/neutral position switch circuit
Park/neutral position switch
ECMWhen driving under conditions (a) and (b) for 30 sec. or more
the park/neutral position switch is ON (N position):
(2 trip detection logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500 − 2,500 rpm
HINT:
After confirming DTC P1780 use the TOYOTA hand−held tester to confirm the PNP switch signal from ”CUR-
RENT DATA”.
WIRING DIAGRAM
Refer to DTC P1780 on page DI−11 4.
INSPECTION PROCEDURE
Refer to DTC P1780 on DI−11 4.
DI0U5−02

Downloaded from www.Manualslib.com manuals search engine A00646
J/B No.1EA1
3
7
2IGN 1A
8
2
1
W
Battery
W−R
W−R 4 B−R
1C
17B−Y
IG
SwitchB−Y
IA3
W−R
4
AM2
3
2
R−L
W−R
R/B No.2EFI
22 2 225
B−W221 3
EFI
Relay
W−B
EA EB
EA1
9W−R
(M/T)
IE1
W−R
(M/T)
W−R (A/T)12 12
E4 E4
14 24
E7 E7 BR
(A/T) (M/T)
E1 +B
ECM
8
− DIAGNOSTICSENGINE (3RZ−FE)
DI−11 5
1996 TOYOTA T100 (RM449U)
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of
the EFI main relay (Making: EFI) and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
DI0U7−03

Downloaded from www.Manualslib.com manuals search engine BE6653
P24220
P24221
A00092
ON
E1 (−) +B (+)
E1 (−) +B (+) For M/T
For A/T
DI−11 6
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminals + B and E1 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 + B and E1 of ECM con-
nector.
OK:
Voltage: 9 − 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−21).
NG
2 Check for open in harness and connector between terminal E1 of ECM and body
ground (See page IN−26).
NG Repair or replace harness or connector.
OK
3 Check EFI main relay (Marking: EFI) (See page MF−40).
NG Replace EFI main relay.
OK