1996 TOYOTA T100 relay

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− SERVICE SPECIFICATIONSBODY ELECTRICAL
252 Author: Date:
1996 TOYOTA T100 (RM449U)B − C
Approx. 55.0 Ω
FUEL SENDER GAUGE
Float position mm (in.)Resistance (Ω)
F: Approx. 95 mmApprox. 3.0 Ω
1/2: Approx. 188.0 mmApprox. 32.5 Ω
E: Approx. 283.0 mmApprox. 110.0 Ω
ENGINE COOLANT TEMPERATURE RECEIVER GAUGE (w/ Tachometer)Resistance (Ω)
A − BApprox. 150.0 Ω
A − CApprox. 54.0 Ω
B − CApprox. 138.0 Ω
ENGINE COOLANT TEMPERATURE RECEIVER GAUGE (w/ o Tachometer)
A − BApprox. 25.0 Ω
OIL PRESSURE RECEIVER GAUGE
A − BApprox. 25.0 Ω
DOOR LOCK CONTROL RELAY (Wire Harness Side)
2 − Ground (Constant)Battery positive voltage
8 − Ground (Ignition Switch LOCK or ACC)No voltage
8 − Ground (Ignition Switch ON)Battery positive voltage
13 − Ground (Key unlock warning switch OFF (Ignition key removed))No voltage
13 − Ground (Key unlock warning switch ON (Ignition key set))Battery positive voltage
CRUISE CONTROL ECU (wire harness side)
24 − 26 (constant)Approx. 2.0 kΩ
25 − 26 (Actuator arm turned)Resistance change even
10 − Ground (Brake pedal position: Released)Approx. 38.0 Ω
10 − Ground (Brake pedal position: Depressed)No continuity
CRUISE CONTROL SWITCH
18 − Ground (Control switch position: OFF)No continuity
18 − Ground (Control switch position: RESUME/ACCEL)Approx. 68.0 Ω
18 − Ground (Control switch position: SET/COAST)Approx. 198.0 Ω
18 − Ground (Control switch position: CANCEL)Approx. 418.0 Ω
14 − Ground (Ignition switch position: LOCK or ACC)No voltage
14 − Ground (Ignition switch position: ON)Battery positive voltage
15 − Ground (Constant)Battery positive voltage
1 − Ground (Constant)Battery positive voltage
16 − Ground (Brake pedal position: Released)No voltage
16 − Ground (Brake pedal position: Depressed)Battery positive voltage
20 − Ground (With ignition switch ON, Speedsensor shaft turned)Valtage changes repeatedly
CRUISE CONTROL ACTUATOR
1 − 3Approx. 2.0 kΩ
2 − 3 (The arm is moving from the closed to open position)Approx. 0.5 to 1.8 kΩ
ANTENNA MOTOR CONTROL RELAY (Wire harness side)
3 − Ground (Constant)Battery positive voltage
5 − Ground (Ignition Switch position: LOCK)No voltage
5 − Ground (Ignition switch position: ACC)Battery positive voltage
7 − Ground (Ignition switch position: LOCK)No voltage

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (3RZ−FE)
DI−15
1996 TOYOTA T100 (RM449U) DTC No.
(See Page)
Detection ItemTrouble AreaMIL*Memory
P0441
(DI−88)Evaporative Emission Control
System Incorrect Purge Flow
Open or short in VSV circuit for EVAP
VSV for EVAP
ECM
Vacuum hose damaged, blocked or disconnected
Charcoal canister

P0500
(DI−92)Vehicle Speed Sensor
Malfunction
Open or short in No.1 vehicle speed sensor circuit
No.1 vehicle speed sensor
ECM
Speedometer cable

P0505
(DI−94)Idle Control System
MalfunctionIAC valve is stuck or closed
Open or short in IAC valve circuit
Air intake (hose loose)

P0510
(DI−97)Closed Throttle Position
Switch MalfunctionOpen in closed throttle position switch circuit
Closed throttle position switch
ECM

*:  MIL lights up
MANUFACTURER CONTROLLED
DTC No.
(See Page)Detection ItemTrouble AreaMIL*Memory
P1300
(DI−103)Igniter Circuit Malfunction
Open or short in IGF or IGT circuit from igniter to ECM
Igniter
ECM

P1335
(DI−109)Crankshaft Position Sensor
Circuit Malfunction
(during engine running)Open or short in crankshaft position sensor circuit
Crankshaft position sensor
ECM
−
P1500
(DI−11 0)Starter Signal Malfunction
Open or short in starter signal
Open or short in ignition switch or starter relay circuit
ECM
−
P1600
(DI−11 2)ECM BATT MalfunctionOpen in back up power source circuit
ECM
P1780
(DI−11 4)Park/Neutral Position Switch
MalfunctionShort in park/neutral position switch circuit
Park/neutral position switch
ECM

*: −  MIL does not light up,  MIL lights up

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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

Downloaded from www.Manualslib.com manuals search engine P19917
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.

Downloaded from www.Manualslib.com manuals search engine BE6653
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

Downloaded from www.Manualslib.com manuals search engine P19611
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

Downloaded from www.Manualslib.com manuals search engine BE6653
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.

Downloaded from www.Manualslib.com manuals search engine P19893
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