relay TOYOTA T100 1996 Factory Workshop Manual

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Vapor Pressure SensorECM
From
Battery
From
IG SwitchII
IDIM12H
2D2C
2BE7
E6
E7
E6
E6 3
92
25
12 3
AA2 1
8 2 1 VSV (for EVAP)
VSV
(for Vapor
Pressure Sensor) LG
W−B B−O BP L−R
BR13
22 3
2
1
10
IGN
Instrument
Panel J/BDriver Side J/B
EFI Relay
EB
J/B
No.3VC
E2
E1
E01
E01 TPC EVP 1PTNK
BR
EFI
A
12 LGW−L 3
B−O5 V
− DIAGNOSTICSENGINE (5VZ−FE)
DI−213
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
TOYOTA hand−held tester:
1 Check VSV connector for EVAP, VSV connector for vapor pressure sensor and
vapor pressure sensor connector for looseness and disconnection.
NG Repair or connect VSV or sensor connector.
OK

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DI−217
1996 TOYOTA T100 (RM449U)
8 Check operation of VSV for EVAP (See page SF−50).
NG Replace VSV.
OK
9 Check for open and short in harness and connector between EFI main relay
(Marking: EFI), VSV for EVAP and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).

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DI−219
1996 TOYOTA T100 (RM449U)
12 Check operation of VSV for vapor pressure sensor (See page SF−50).
NG Replace VSV.
OK
13 Check for open and short in harness and connector between EFI main relay
(Marking: EFI), VSV for vapor pressure sensor and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK

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S05700
S05703
A00786VSV is ONVSV is OFF ON
For M/T
For A/TTPC
OFF
ON
OFF
ONTPC
DI−224
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
8 Check for open and short in harness and connector between EFI main relay
(Marking: EFI), VSV for EVAP and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).
9 Check VSV for vapor pressure sensor.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Turn the ignition switch ON.
CHECK:
Check VSV function.
(1) Connect between terminal TPC of ECM and body
ground (ON).
(2) Disconnect between terminal TPC of ECM and
body ground (OFF).
OK:
(1) VSV is ON:
Air flows from port E to port F.
(2) VSV is OFF:
Air flows from port E to port G.
OK Check and replace charcoal canister (See page
EC−1).
NG

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DI−225
1996 TOYOTA T100 (RM449U)
10 Check operation of VSV for vapor pressure sensor.
NG Replace VSV.
OK
11 Check for open and short in harness and connector between EFI main relay
(Marking: EFI), VSV for vapor pressure sensor 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
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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DI−242
− DIAGNOSTICSENGINE (5VZ−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 vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied 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 switch or starter relay circuit
ECM
HINT:
In this circuit, diagnosis can only be made in the check mode.
WIRING DIAGRAM
DI9AG−01

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DI−243
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
This diagnostic chart 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−148.
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 push 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−148).
NG
2 Check for open in harness and connector between ECM and starter relay (See
page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).

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DI−247
1996 TOYOTA T100 (RM449U)
DTC P1780 Park/Neutral Position Switch Malfunction
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 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 ”R”, ”N”, ”2”
and ”L” and 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 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−247.
INSPECTION PROCEDURE
Refer to DTC P1780 on page DI−247.
DI0V9−01

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W
SwitchIG
W
W W W
Park/Neutral
Position Switch
Clutch Start
Cancel Switch
Clutch
Start
SwitchStarter
Relay
StarterECM
STA
E1 11 1 3
E4 E7
IE1(M/T)(A/T) IE1 IE1
IA3
IA3
EB1
B−W (M/T)
BatteryB−W B−WB−W
B−W
B−W
B−W
W−B (A/T) W−B
(M/T)
B−R
B−R
(M/T)B−R
(M/T)
(M/T)
B−R (M/T) W−B (M/T)B−Y
W
R/B
No.2B (M/T)B
B(A/T)
B−O B−O
(A/T)
IC
IC
21
S1
1 1 13 3 15
2
1
2 12 3
15
26
2 2
ALT AM1
141 3622
5
615
2 2(M/T)
(A/T) (A/T) DI−248
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
Starter Signal Circuit
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied 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.
WIRING DIAGRAM
DI0VA−01