1996 TOYOTA T100 relay

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− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U) DTC No.
(See Page)
Detection ItemTrouble AreaMIL*Memory
P0441
(DI−212)Evaporative Emission Control
System Incorrect Purge Flow
Open or short in VSV circuit for EVAP
VSV for EVAP
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
Open or short in VSV circuit for vapor pressure sensor
VSV for vapor pressure sensor
Vacuum hose cracked, holed, blocked, damaged or
disconnected
Charcoal canister cracked, holed or damaged

P0500
(DI−226)Vehicle Speed Sensor
Malfunction
Open or short in No.1 vehicle speed sensor circuit
No.1 vehicle speed sensor
ECM
Speedometer cable

P0505
(DI−228)Idle Control System
Malfunction
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)

P0510
(DI−231)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−235)Igniter Circuit Malfunction
Open or short in IGF or IGT circuit from igniter to ECM
Igniter
ECM

P1335
(DI−241)Crankshaft Position Sensor
Circuit Malfunction
(during engine running)Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Starter
ECM
−
P1500
(DI−242)Starter Signal Circuit Malfunction
Open or short in starter signal circuit
Open or short in ignition switch or starter relay circuit
ECM
−
P1600
(DI−244)ECM BATT MalfunctionOpen in back up power source circuit
ECM
P1605
(DI−246)Knock Control CPU MalfunctionECM
P1780
(DI−247)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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A00783
DLC3
EGR Gas Temp. Sensor*
A/C Amplifier
Circuit Opening Replay
ECM
Throttle Position Sensor
IAC Valve
Igniter
Mass Air
Flow MeterHeated Oxygen Sensor (Bank 1 Sensor 1)
Combination Meter
Heated Oxygen
Sensor (Bank 1
Sensor 2)
Park/Neutral
Position Switch
Fuel Pump
Ignition Switch
VSV for EGR*
Stop Light Switch
VSV for Vapor Pressure Sensor
VSV for EVAP
EFI Main Relay
(Marking : EFI)
DLC1 Knock Sensor 2 Knock Sensor 1Injector Ignition Coil Injector
Camshaft
Position Sensor
Engine Coolant
Temp. Sensor
Crankshaft Position
Sensor
*: Only for 2WD models with a load capacity of 0.5 ton and regular cab.
− DIAGNOSTICSENGINE (5VZ−FE)
DI−143
1996 TOYOTA T100 (RM449U)
PARTS LOCATION

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DI−148
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Engine does not crank (Does not start)1. Starter and starter relayST−6
ST−14
No initial combustion (Does not start)
1. ECM power source circuit
2. Fuel pump control circuit
3. Engine control module (ECM)DI−251
DI−255
IN−26
No complete combustion (Does not start)1. Fuel pump control circuitDI−255
Engine cranks normally (Difficult to start)
1. Starter signal circuit
2. Fuel pump control circuit
3. CompressionDI−248
DI−255
EM−2
Cold engine (Difficult to start)1. Starter signal circuit
2. Fuel pump control circuitDI−248
DI−255
Hot engine (Difficult to start)1. Starter signal circuit
2. Fuel pump control circuitDI−248
DI−255
High engine idle speed (Poor idling)1. A/C signal circuit (Compressor circuit)
2. ECM power source circuitAC−79
DI−251
Low engine idle speed (Poor idling)1. A/C signal circuit (Compressor circuit)
2. Fuel pump control circuitAC−79
DI−255
Rough idling (Poor idling)1. Compression
2. Fuel pump control circuitEM−2
DI−255
Hunting (Poor idling)1. ECM power source circuit
2. Fuel pump control circuitDI−251
DI−255
Hesitation/Poor acceleration (Poor driveability)1. Fuel pump control circuit
2. A/T faultyDI−255
DI−282
Surging (Poor driveability)1. Fuel pump control circuitDI−255
Soon after starting (Engine stall)1. Fuel pump control circuitDI−255
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 Switch
Mass Air Flow MeterBattery
R/B No.2
J/B No.1B−W
W−R
B−YEFI
IGN
EFI RelayW−R
B−Y
W−B
EA1EA1
IE1
W−R W−R
1A1C
EA
1
2
222
2
12
2
2 3 2
4
17
31
2
52
E6 E6
E6 E68
818
GR−R
BR−W
(M/T)(A/T)
VG
E3
E1
W
9
9ECM
DI−150
− DIAGNOSTICSENGINE (5VZ−FE)
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 rata (gm/sec.)Approx. 011.0 − 25.1 (idling after warming up)
Type I Go to step 2.
Type II Go to step 5.

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P24310A00099
ON
1 (+)
P23805
P24311A00100
For M/T
For A/TVG (+)
VG (+)
− DIAGNOSTICSENGINE (5VZ−FE)
DI−151
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
between EFI main relay 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 SF−61).
(b) Start the engine.
CHECK:
Measure voltage between terminal VG of ECM connector and
body ground while engine is idling.
OK:
Voltage:
1.1 − 1.5 V (P or N position and 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
To Body GroundFrom
IG Switch
EFI RelayW−R
EFI
2
2
15 13EA1IE1 W−RW−RW−R 99
W−R
Heated
Oxygen
Sensor
(Bank 1
Sensor 2)2
13
423
14Heated
Oxygen
Sensor
(Bank 1
Sensor 1)
P−G
E5 E7
E7
E5
E5 E7 R−G RECM
OX1
HT1
OX2
E1
HT2E03
E03 (M/T)(A/T)5
3
13
24
913
16
19
16
15 W
BR BR
BR
DI−170
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
HINT:
After confirming DTC P0125 use the OBD II scan tool or TOYOTA hand−held tester to confirm voltage output
of heated oxygen sensor from "CURRENT DATA".
If voltage output of heated oxygen sensor is 0 V, heated oxygen sensor circuit may be open or short.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Connect OBD II scan tool or TOYOTA hand−held tester and read value for
voltage 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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DI−177
1996 TOYOTA T100 (RM449U)
2 Check resistance of heated oxygen sensor heater (See page SF−60).
NG Replace heated oxygen sensor.
OK
Check and repair harness or connector
between EFI main relay, heated oxygen
sensor and ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine FI4825
EGR
Vacuum
Modulator ECM
VSV EGR Valve Throttle Body
Throttle
Valve
Intake Air
Chamber
Exhaust Gas
P19921
R/B No.2 IG Switch
E4 E5
(M/T)(A/T)
E01
E1 ECM
E2 EGR
THG
E6 E6
E6 E6
18 8
21 14
922 1
BR−B P2
2
1 9 9
EA
W−R W−R
IE1W−REA1
W−B
2 3
2
2 2
2 2
2
2
1 1
5 B−W
EFIEFI Relay
VSV for EGR
EGR Gas
Temp. SensorB−YEA14B−Y
1C17
1A3
W−R IGNJ/B
No.1FromFrom Battery
R−W
5 V DI−196
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0401 Exhaust Gas Recirculation Flow Insufficient
Detected*
*: Only for 2WD models with a load capacity of 0.5 ton and regular cab.
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
driveability:
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 valve does not
exceed 60°C (140°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
DI0UX−01