ISUZU TROOPER 1998 Service Repair Manual

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±40
Check flowTrouble codePhenomenonStandard
613The reference is short-circuited to
GND.Reference
5 V
15The reference Vb is short-circuited.
If the reference wire (15) is short-circuited to GND, the
speed signal is not generated. If the wire is short-circuited
to the battery voltage, the signal level becomes faulty.
D04RW061

4B2±41 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Start the engine.
Does the voltage between terminals 15 and 19 meet the standard
5V?
Go to Step 8Go to Step 2
2Is the voltage below the standard?Go to Step 3Go to Step 7
31. Turn off the starter switch.
2. Disconnect the ECU connector.
Is the continuity established between vehicle harness terminals
(B±67)7 and (B±67)11?
Go to Step 4
The ECU is
failed. Replace
the ECU.
Go to Step 8
41. Disconnect the H-49 connector.
Is the continuity established between floor harness connector
terminals (H-49)3 and (H-49)9?
Go to Step 5Go to Step 6
51. Disconnect the A±3 connector.
Is the continuity established between transfer harness connector
terminals (A±3)2 and (A±3)7?
Replace the front
speed sensor.
Go to Step 8
The reference
harness for the
front speed
sensor is
short±circuited to
GND. Repair the
circuit.
Go to Step 8
61. Disconnect the A±3 connector.
Is the continuity established between transfer harness connector
terminals (A±3)1 and (A±3)7?
Replace the rear
speed sensor.
Go to Step 8
The reference
harness for the
rear speed
sensor is
short±circuited to
GND. Repair the
circuit.
Go to Step 8
71. Turn off the starter switch.
2. Disconnect the ECU connector.
3. Turn on the starter switch.
Is the battery voltage observed between harness connector
terminals (B±67)7 and (B±67)11?
Repair the
harness circuit.
Go to Step 8
The ECU has
failed. Replace
the ECU.
Go to Step 8
81. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
ªDiagnosis Flowº
Go to Step 8

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±42
Check flowTrouble codePhenomenonStandard
721The voltage of the throttle position
sensor (TPS) is faulty.
The signal voltage from the TPS deviates from the stan-
dard range.
D04RW056

4B2±43 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn off the starter switch.
Is the battery voltage normal?
Go to Step 2
Charge or
replace the
battery.
Go to Step 6
21. Turn on the starter switch.
Does the voltage between terminals 21 and 19 fall within the
standard range above?
Go to Step 6Go to Step 3
31. Turn off the starter switch.
2. Disconnect the ECU connector.
3. Turn on the starter switch.
Does the voltage between terminals (B±68)9 and (B±67)11 fall
within the standard range above?
The ECU has
failed. Replace
the ECU.
Go to Step 6
Go to Step 4
4Is the harness healthy?
Go to Step 5
Repair the
harness.
Go to Step 6
5Is the TPS healthy?
Go to Step 6
Replace the TPS.
Go to Step 6
61. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
ªDiagnosis Flowº.
Go to Step 6

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±44
Check flowTrouble codePhenomenonStandard
834The diesel/gasoline engine identifi-
cation signal is faulty.Gasoline: Continuity established
The engine identification signals of 6VE1 and 4JX1 are
changed each other.
D04RW056

4B2±45 DRIVE LINE CONTROL SYSTEM (TOD)
6VE1
Step
ActionYe sNo
11. Turn off the starter switch.
Is the continuity established between terminals 14 and 19?
Go to Step 2
The harness is
broken. Repair
the circuit.
Go to Step 3
21. Turn on the starter switch.
Does the voltage between terminals 14 and 19 indicate 0V?The phenomenon
is not
reproduced.
Refer to
ªTroubles
intermittently
observedº
Go to Step 3
The ECU has
failed. Replace
the ECU.
Go to Step 3
31. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
ªDiagnosis Flowº.
Return to Step 3

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±46
Check flowTrouble codePhenomenonStandard
931The electromagnetic coil is broken.Ð
D04RW060

4B2±47 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.
Is the continuity established between terminals (B±67)4 and
(B±67)12?
Go to Step 2Go to Step 4
21. Connect the ECU connector.
2. Start the engine.
3. Set the TOD mode.
Does the voltage between terminals 4 and 20 indicate at least
0.4V?
Go to Step 3
The ECU has
failed. Replace
the ECU.
Go to Step 5
3Is the battery voltage always observed between terminals 4 and
20?
The harness is
short±circuited on
the battery.
Repair the circuit.
Go to Step 5
The phenomenon
is not
reproduced.
Refer to
ªTroubles
intermittently
observedº.
Go to Step 5
41. Disconnect the M±27 connector.
Is the continuity established between transfer connector
terminals (A±3)8 and (A±3)7?
The harness is
broken. Repair
the circuit.
Go to Step 5
Replace the
transfer
electromagnetic
coil (solenoid
clutch).
Go to Step 5
51. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
ªDiagnosis Flowº.
Return to Step 5

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±48
Check flowTrouble codePhenomenonStandard
1026The electromagnetic coil GND is
short-circuited.Resistance: 1.0 to 5.0 ohm (at ordi-
nary temperature)
D04RW060

4B2±49 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.
Does the resistance between terminals (B±67)4 and (B±67)12?
indicate 1.0 to 5.0 ohm?
Go to Step 2Go to Step 3
21. Connect the ECU connector.
2. Start the engine.
3. Set the TOD mode.
When the throttle is operated between full close and full open
positions, does the voltage between terminals 4 and 20 indicate at
least 0.1 to 1.0 V?The phenomenon
is not
reproduced.
Refer to
ªTroubles
intermittently
observedº.
Go to Step 4
The ECU has
failed. Replace
the ECU.
Go to Step 4
3Does the resistance between transfer connector terminals (A±3)8
and (A±3)7 indicate 1.0 to 5.0ohm?
The harness is
broken. Repair
the circuit.
Go to Step 4
Replace the
transfer
electromagnetic
coil.
Go to Step 4
41. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
ªDiagnosis Flowº.
Return to Step 4