1996 TOYOTA T100 engine

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2 (+)
1 (+)
4 (−)
21
34
6
BE6653
P24224
P24225
A00095
ON
FC (+)
FC (+) For M/T
For A/T
− DIAGNOSTICSENGINE (3RZ−FE)
DI−121
1996 TOYOTA T100 (RM449U)
3 Check circuit opening relay.
PREPARATION:
Remove the circuit opening relay (See page MF−42).
CHECK:
(a) Apply battery voltage between terminals 2 and 4.
(b) Measure voltage between terminals 1 and 4.
OK:
Terminals 1 and 4Same as battery
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC 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 terminal FC of ECM connector and
body ground.
OK:
Voltage: 9 − 14 V
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay,
circuit opening relay and ECM.
OK

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

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START
3
− DIAGNOSTICSENGINE (3RZ−FE)
DI−123
1996 TOYOTA T100 (RM449U)
8 Check voltage between terminal 3 of circuit opening relay connector and body
ground.
CHECK:
Measure voltage between terminal 3 of circuit opening relay
connector and body ground when engine is cranked.
OK:
Voltage: 9 − 14 V
NG Check for starter signal circuit (See page
DI−11 0).
OK
Check for open in harness and connector between terminal 6 of circuit opening relay connector
and body ground (See page IN−26).

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 DI−126
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
7 Check circuit opening relay (See page MF−42).
NG Replace circuit opening relay.
OK
8 Check voltage between terminal 3 of circuit opening relay connector and body
ground (See page MF−42).
NG Check for starter signal circuit (See page
DI−11 0).
OK
Check for open in harness and connector be-
tween terminal 6 of circuit opening relay con-
nector and body ground (See page IN−26).

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Vehicle Brought to Workshop
Customer Problem Analysis P. DI−128
Problem Symptom Confirmation
If the engine does not start, perform steps 10 and 12 firstConnect the OBD II scan tool or TOYOTA hand−held tester to DLC3 P. DI−129
If the display indicates a communication fault in the tool, inspect DLC3 P. DI−129
Check DTC and Freezed Frame Data (Precheck)
Record or Print DTC and Freezed Frame Data P. DI−129
Clear DTC and Freezed Frame Data P. DI−129
Visual Inspection
Setting the Check Mode Diagnosis P. DI−129
Symptom Simulation P. IN−16
DTC Chart P. DI−140
Problem Symptoms Table P. DI−148
Circuit Inspection P. DI−149
Adjustment, Repair
DTC Check P. DI−129
Titles insideare titles of pages in
in the bottom portion. See the indicated
pages for detailed explanations.this manual with the page number indicated
Malfunction
occurs.Malfunction does not occur.
Parts Inspection
Check for Intermittent Problems P. DI−129
Identification of Problem
Confirmation Test
End 1
2
3
4
5
6
7
108
9
11
12
13
15 14
16
Normal Malfunction code.
17Basic Inspection P. DI−129
− DIAGNOSTICSENGINE (5VZ−FE)
DI−127
384 Author: Date:
1996 TOYOTA T100 (RM449U)
ENGINE (5VZ−FE)
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoot in accordance with the procedure on the following page.

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ENGINE CONTROL SYSTEM Check Sheet
Customer’s Name
Driver’s Name
Date Vehicle
Brought in
License No.
Model and Model
Year
Frame No.
Engine Model
Odometer Reading
km
miles
Problem Symptoms
Engine does
not Start
Difficult to
Start
Poor Idling
Poor
Driveability
Engine Stall
Others
Engine does not crankNo initial combustionNo complete combustion
Engine cranks slowly
Other
Incorrect first idleIdling rpm is abnormalHigh ( rpm)Low ( rpm)
Rough idling
Other
HesitationBack fireMuffler explosion (after−fire)Surging
Knocking
Other
Soon after startingAfter accelerator pedal depressed
After accelerator pedal released
During A/C operation
Shifting from N to D
Other
Dates Problem
Occurred
Problem Frequency
Condition When
Problem Occurs
Weather
Engine Operation
Engine Temp. Place Outdoor Temp.Constant
Sometimes ( times per day/month)Once only
Other
Fine
CloudyRainySnowyVarious/Other
Hot
Warm CoolCold (approx. °F/ °C)
Highway
SuburbsInner cityUphillDownhill
Rough road
Other
Cold
Warming upAfter warming upAny temp.Other
Starting
Just after starting ( min.)IdlingRacing
Driving
Constant speedAccelerationDeceleration
A/C switch ON/OFF
Other
Condition of MILRemains on Sometimes lights up Does not light up
NormalMalfunction code(s) (code )
Freezed frame data ( )
NormalMalfunction code(s) (code )
Freezed frame data ( )
Normal Mode
(Precheck)
Check Mode DTC InspectionInspector’s
Name
DI−128
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
CUSTOMER PROBLEM ANALYSIS CHECK