1996 TOYOTA T100 check engine

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (5VZ−FE)
DI−249
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the problem symptoms table on page DI−148.
TOYOTA hand−held tester:
1 Connect TOYOTA hand−held tester and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand−held tester main switch ON.
CHECK:
Read STA signal on the TOYOTA hand−held tester while starter operates.
OK:
Ignition Switch PositionONSTART
STA signalOFFON
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−148).
NG
2 Check for open in harness and connector between ECM and starter relay (Mark-
ing: ST) (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine BE6653S04092S05027A00776
START
For M/T
For A/TSTA (+)
STA (+)
DI−250
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
OBD II scan tool (excluding TOYOTA hand−held tester):
1 Check voltage between terminal STA of ECM connector and body ground.
PREPARATION:
Remove the right cowl side trim (See page SF−61).
CHECK:
Measure voltage between terminal STA of ECM connector and
body ground, during engine cranking.
OK:
Voltage: 6 V or more
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−148).
NG
2 Check for open in harness and connector between ECM and starter relay (See
page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine BE6653
P24221
P24332A00126
ON
For M/T
For A/TE1 (−) +B (+)
E1 (−) +B (+)
DI−252
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminals + B and E1 of ECM connector.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals + B and E1 of ECM con-
nector.
OK:
Voltage: 9 − 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−148).
NG
2 Check for open in harness and connector between terminal E1 of ECM and body
ground (See page IN−26).
NG Repair or replace harness or connector.
OK
3 Check EFI main relay (Marking: EFI) (See page SF−45).
NG Replace EFI main relay.
OK

Downloaded from www.Manualslib.com manuals search engine FI7106
IGN Fuse
J/B No.1
− DIAGNOSTICSENGINE (5VZ−FE)
DI−253
1996 TOYOTA T100 (RM449U)
4 Check EFI fuse (See page DI−244, step 2).
NG Check for short in all harness and
components connected to EFI fuse.
OK
5 Check for open harness and connector between EFI main relay (Marking: EFI)
and battery, EFI main relay (Marking: EFI) and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK
6 Check IGN fuse.
PREPARATION:
Remove the IGN fuse from the J/B No.1.
CHECK:
Check continuity of IGN fuse.
OK:
Continuity
NG Check for short in all harness and
components connected to IGN fuse.
OK

Downloaded from www.Manualslib.com manuals search engine DI−254
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
7 Check ignition switch (See page BE−12).
NG Replace ignition switch.
OK
Check for open in harness and connector be-
tween IG switch and EFI main relay, EFI main
relay and body ground (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine BE6653A00773A00788Fuel Inlet Hose
ON
− DIAGNOSTICSENGINE (5VZ−FE)
DI−257
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
TOYOTA hand−held tester:
1 Connect TOYOTA hand−held tester and check operation of fuel pump.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand−
held tester main switch ON.
(c) Use ”ACTIVE TEST” mode to operate the fuel pump.
CHECK:
Check for fuel pressure in the fuel inlet hose when it is pinched
off.
OK:
There is pressure in the fuel inlet hose.
HINT:
At this time, you will hear a fuel flowing noise.
OK Go to step 7.
NG
2 Check for ECM power source circuit (See page DI−244).
NG Repair or replace.
OK

Downloaded from www.Manualslib.com manuals search engine A00685
2 (+)
1 (+)
4 (−)
1 2
34
6
BE6653
P24225
P24335A00128
ON
For M/T
For A/TFC (+)
FC (+)
DI−258
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
3 Check circuit opening relay.
PREPARATION:
Remove the circuit opening relay (See page SF−46).
CHECK:
(a) Apply battery voltage between terminals 2 and 4.
(b) Measure voltage between terminals 1 and 4.
OK:
Voltage: Same 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 SF−61).
(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,
and ECM (See page IN−26).
OK

Downloaded from www.Manualslib.com manuals search engine A00686
1 2
34
6
3 (+)
6 (−)1
2
− DIAGNOSTICSENGINE (5VZ−FE)
DI−259
1996 TOYOTA T100 (RM449U)
5 Check fuel pump (See page SF−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 (See page IN−26).
7 Check circuit opening relay.
PREPARATION:
Remove the circuit opening relay (See page SF−46).
CHECK:
(a) Apply battery voltage between terminals 3 and 6.
(b) Check continuity between terminal 1 and 2.
OK:
Continuity
NG Replace circuit opening relay.
OK