1996 TOYOTA T100 fuel pump

Downloaded from www.Manualslib.com manuals search engine A00686
3 (+)
6 (−)1
2
1 2
34
6
DI−122
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
5 Check fuel pump (See page MF−5).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump, fuel pump and body ground (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
7 Check circuit opening relay.
PREPARATION:
Remove the circuit opening relay (See page MF−42).
CHECK:
(a) Apply battery voltage between terminals 3 and 6.
(b) Check continuity between terminal 1 and 2.
OK:
Terminals 1 and 2Continuity
NG Replace circuit opening relay.
OK

Downloaded from www.Manualslib.com manuals search engine A00688
ON
For M/T
For A/TFC (+)
FC (+)
Fuel Return Hose
DI−124
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
OBD II scan tool (excluding TOYOTA hand−held tester):
1 Check operation of fuel pump.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Turn the ignition switch ON.
CHECK:
(a) Connect between terminal FC of ECM connector and
body ground.
(b) Check for fuel pressure in the fuel return hose when it is
pinched off.
OK:
There is pressure in the fuel return hose.
HINT:
At this time, you will hear a fuel return flowing noise.
OK Go to step 7.
NG
2 Check for ECM power source circuit (See page DI−11 5).
NG Repair or replace.
OK

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (3RZ−FE)
DI−125
1996 TOYOTA T100 (RM449U)
3 Check circuit opening relay (See page MF−42).
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM connector and body ground (See
page MF−42).
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay,
circuit opening relay and ECM.
OK
5 Check fuel pump (See page IG−1).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump, fuel pump and body ground (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM.

Downloaded from www.Manualslib.com manuals search engine BE6653A00773A00788
ON
Fuel Inlet Hose
DI−136
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
7 Check fuel pressure.
PREPARATION:
(a) Be sure that enough fuel is in the tank.
(b) Connect the TOYOTA hand−held tester to the DLC3.
(c) Turn the ignition switch ON and push the TOYOTA hand−
held tester main switch ON.
(d) Use ”ACTIVE TEST” mode to operate the fuel pump.
(e) Please refer to the TOYOTA hand−held tester operator’s
manual for further details.
(f) If you have no TOYOTA hand−held tester, connect the
positive (+) and negative (−) leads from the battery to the
fuel pump connector (See page SF−5).
CHECK:
Check for fuel pressure in the fuel inlet hose when it is pinched
off.
HINT:
At this time, you will hear a fuel flowing noise.
NG Proceed to page SF−5 and continue to trouble-
shoot.
OK

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (5VZ−FE)
DI−139
1996 TOYOTA T100 (RM449U)
(b) TOYOTA Enhanced Signals.
TOYOTA hand−held tester displayMeasurement ItemNormal Condition*1
MISFIRE RPMEngine RPM for first misfire rangeMisfire 0: 0 rpm
MISFIRE LOADEngine load for first misfire rangeMisfire 0: 0 g/r
INJECTORFuel injection time for cylinder No.1Idling: 1.82 − 3.15 ms
IAC DUTY RATIOIntake Air Control Valve Duty Ratio
Opening ratio rotary solenoid type IAC valveIdling: 22 − 46 %
STARTER SIGStarter SignalCranking: ON
A/C SIGA/C Switch SignalA/C ON: ON
PNP SWPark/Neutral Position Switch SignalP or N position: ON
STOP LIGHT SWStop Light Switch SignalStop light switch ON: ON
FC IDLFuel Cut Idle: Fuel cut when throttle valve fully
closed, during decelerationFuel cut operating: ON
FC TAUFuel Cut TAU: Fuel cut during very light loadFuel cut operating: ON
CYL #1 − CYL #6Abnormal revolution variation for each cylinder0 %
IGNITIONTotal number of ignition for every 1,000
revolutions0 − 3,000
EGRT GAS*2EGR Gas Temp. Sensor Value
EGR not operating:
Temp. between intake air temp. and engine
coolant temp.
EGR SYSTEM*2EGR System Operating ConditionIdling: OFF
A/C CUT SIGA/C Cut SignalA/C S/W OFF: ON
FUEL PUMPFuel Pump SignalIdling: ON
EVAP (PURGE) VSVEVAP VSV SignalVSV operating: ON
VAPOR PRESS VSVVapor Pressure VSV SignalVSV operating: ON
TOTAL FT B1Total Fuel Trim Bank 1: Average value for fuel
trim system of bank 1Idling: 0.8 − 1.2 V
O2 LR B1, S1
Oxygen Sensor Lean Rich Bank 1, Sensor 1 Re-
sponse time for oxygen sensor output to switch
from lean to rich
Idling after warming up: 0 − 1,000 msec.
O2 RL B1, S1
Oxygen Sensor Rich Lean Bank 1, Sensor 1 Re-
sponse time for oxygen sensor output to switch
from rich to lean
Idling after warming up: 0 − 1,000 msec.
*1: If no conditions are specifically stated for ”ldling”, it means the shift lever is at N or P position, the A/C
switch is OFF and all accessory switches are OFF.
*2: Only for 2WD models with a load capacity of 0.5 ton and regular cab.

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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 − DIAGNOSTICSENGINE (5VZ−FE)
DI−181
1996 TOYOTA T100 (RM449U)
2 Check for heated oxygen sensor (bank 1 sensor 1) data.
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 heated oxygen sensor (bank 1 sensor 1) output voltage and short−term fuel trim.
RESULT:
PatternHeated oxygen sensor output voltageShort−term fuel trim
1Lean condition (Changes at 0.55 V or less)Changes at about + 20 %
2Rich condition (Changes at 0.35 V or more)Changes at about − 20 %
3Except 1 and 2Except 1 and 2
3 Check for heated oxygen sensor
(bank 1 sensor 1) (See page DI−172).
1, 2
3 Check fuel pressure (See page SF−5).
NG Check and repair fuel pump, pressure
regulator, fuel pipe line and filter
(See page SF−5).
OK
4 Check injector injection (See page SF−21).
NG Replace injector.
OK