relay TOYOTA T100 1996 Factory User Guide

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− DIAGNOSTICSENGINE (3RZ−FE)
DI−21
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Engine does not crank (Does not start)1. Starter and starter relayST−15
No initial combustion (Does not start)1. ECM power source circuit
2. Fuel pump control circuitDI−11 5
DI−11 8
No complete combustion (Does not start)1. Fuel pump control circuitDI−11 8
Engine cranks normally (Difficult to start)
1. Starter signal circuit
2. Fuel pump control circuit
3. CompressionDI−11 0
DI−11 8
EM−3
Cold engine (Difficult to start)1. Starter signal circuit
2. Fuel pump control circuitDI−11 0
DI−11 8
Hot engine (Difficult to start)1. Starter signal circuit
2. Fuel pump control circuitDI−11 0
DI−11 8
High engine idle speed (Poor idling)1. A/C signal circuit (Compressor circuit)
2. ECM power source circuitAC−79
DI−11 5
Low engine idle speed (Poor idling)1. A/C signal circuit (Compressor circuit)
2. Fuel pump control circuitAC−79
DI−11 8
Rough idling (Poor idling)1. Compression
2. Fuel pump control circuitEM−3
DI−11 8
Hunting (Poor idling)1. ECM power source circuit
2. Fuel pump control circuitDI−11 5
DI−11 8
Hesitation/Poor acceleration (Poor driveability)1. Fuel pump control circuit
2. A/T faultyDI−11 8
DI−282
Surging (Poor driveability)1. Fuel pump control circuitDI−11 8
Soon after starting (Engine stall)1. Fuel pump control circuitDI−11 8
During A/C operation (Engine stall)1. A/C signal circuit (Compressor circuit)
2. Engine control module (ECM)AC−79
IN−26

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From
IG SwitchBattery
R/B No.2
J/B No.1B−W
W−R
B−YEFI
IGN
EFI RelayW−R
B−Y
W−B
EA1
EA1
IE1
W−R
W−R
1A 1C
EA
2
222
2
2 2 3
4
17
31
22
E6E6
E6 E62
16 3 Y−R
BR
(M/T)(A/T)
VG
E3
E1W
9
9ECM
Mass Air Flow Meter 5
1
3
− DIAGNOSTICSENGINE (3RZ−FE)
DI−23
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Connect OBD II scan tool or TOYOTA hand−held tester and read value of mass
air flow rate.
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.
(c) Start the engine.
CHECK:
Read mass air flow rate on the OBD II scan tool or TOYOTA hand−held tester.
RESULT:
Type IType II
Mass air flow rate (gm/sec.)0.5 gm/sec.202.2 gm/sec. or more
Type I Go to step 2.
Type II Go to step 5.

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P23803
A00055
ON
1 (+)
P23804
P23805
A00044
VG (+)
For A/T For M/T
VG (+)
DI−24
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
2 Check voltage of mass air flow meter power source.
PREPARATION:
(a) Disconnect the mass air flow meter connector.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal 1 of mass air flow meter con-
nector and body ground.
OK:
Voltage: 9 − 14 V
NG Check for open in harness and connector be-
tween EFI main relay (Marking : EFI) and mass
air flow meter (See page IN−26).
OK
3 Check voltage between terminals VG of ECM connector and body ground.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Start the engine.
CHECK:
Measure voltage between terminal VG of ECM connector and
body ground while engine is idling.
OK:
Voltage:
1.0 − 1.5 V (A/C switch OFF)
OK Check and replace ECM (See page IN−26).
NG

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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

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P23814
P23815
A00056
ON
For M/T
For M/THT1 (+) HT2 (+)
HT1 (+) HT2 (+)
DI−52
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminals HT1, HT2 of ECM connector and body ground.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals HT1, HT2 of ECM connec-
tor and body ground.
HINT:
Connect terminal HT1 to bank 1 sensor 1.
Connect terminal HT2 to bank 1 sensor 2.
OK:
Voltage: 9 − 14 V
OK Check and replace ECM (See page IN−26).
NG
2 Check resistance of heated oxygen sensor heater.
NG Replace heated oxygen sensor.
OK
Check and repair harness or connector be-
tween EFI main relay, heated oxygen sensor
and ECM.

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ECM
Throttle Body
Throttle
ValveCheck
Valve
(for A/T)
EGR Vacuum Modulator
VSVEGR
Valve
P19921
R/B No.2
IG Switch
E7 E7
(M/T)(A/T)
E01
E1 ECM
E2 EGR
THG
E6 E6
E6 E6
622
14 3
99 1
BR−B G−WP
2
2
1 9 9
EA
W−R W−R
5 V
IE1W−REA1
W−B
2
3
22 22
2
25 B−W
EFIEFI Relay
VSV for EGR
EGR Gas
Temp. Sensor B−Y
EA1
4B−Y
1C17
1A3
W−R IGN
J/B
No.1
FromFrom Battery
5
1 DI−72
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0401 Exhaust Gas Recirculation Flow Insufficient
Detected
CIRCUIT DESCRIPTION
The EGR system recirculates exhaust gas, which is controlled to the proper quantity to suit the driving condi-
tions, into the intake air mixture to slow down combustion, reduce the combustion temp. and reduce NOx
emissions. The amount of EGR is regulated by the EGR vacuum modulator according to the engine load.
If even one of the following conditions is fulfilled, the VSV is
turned ON by a signal from the ECM.
This results in atmospheric air acting on the EGR valve, closing
the EGR valve and shutting off the exhaust gas (EGR cut−off).
Under the following conditions, EGR is cut to maintain driveabil-
ity:
Before the engine is warmed up
During deceleration (throttle valve closed)
Light engine load (amount of intake air very small)
Engine racing
DTC No.DTC Detecting ConditionTrouble Area
P0401
After engine is warmed up and run at 80 km/h (50 mph)
for 3 to 5 min., EGR gas temp. sensor value does not exceed
35°C (95°F) above ambient air temp.
(2 trip detection logic)EGR valve stuck closed
Short in VSV circuit for EGR
Open in EGR gas temp. sensor circuit
EGR hose disconnected
ECM
WIRING DIAGRAM
DI0TU−03

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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

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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).

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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

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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