ISUZU AXIOM 2002 Service Repair Manual

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±52
Table 1
Unit: V
AT selector positionVoltage between
terminal 28 and 47Voltage between
terminal 41 and 47Voltage between
terminal 27 and 47
P1200
R12120
N0120
D01212
3121212
212012
10012
Table 2
Continuity between terminals of inhibitor switch connector (E±41)
AT selector positionContinuity between
terminal 8(A) and 5(D)Continuity between
terminal 7(B) and 5(D)Continuity between
terminal 6(C) and 5(D)
PYESNONO
RYESYESNO
NNOYESNO
DNOYESYES
3YESYESYES
2YESNOYES
1NONOYES

4B2±53
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
931 (P1721)The electromagnetic coil is broken
or shorted to the battery or GND.Ð
D04R200005

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±54
StepActionYe sNo
11. Clear the trouble code.
2. Start the engine
3. Set the TOD mode.
Is there DTC31 (P1721)?
Go to Step 2
Refer to ªTrouble
intermittently
observedº.
21. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.
Is the continuity established between terminals (C±38)11 and
(C±38)22?
Go to Step 3Go to Step 5
31. Connect the ECU connector.
2. Start the engine.
3. Set the TOD mode.
Does the voltage between terminals 11 and 22 indicate at least
0.4V?
Go to Step 4Go to Step 6
4Is the battery voltage always observed between terminals 11 and
22?The harness is
short±circuited on
the battery.
Repair the circuit.
Go to
Step 8Go to Step 6
51. Disconnect the A±1 connector.
Is the continuity established between transfer connector
terminals (A±1)8 and (A±1)7?
The harness is
broken. Repair
the circuit.
Go to
Step 8
Replace the
transfer
electromagnetic
coil (solenoid
clutch).
Go to
Step 8
61. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.
Is the resistance between the connector (C±38) terminal 11 and
22 1.0 ~ 5.0
?The ECU has
failed. Replace
the ECU
Go to
Step 8Go to Step 7
7Is the resistance between the transfer connector (A±1) terminal 8
and 7 1.0 ~ 5.0
?
The harness is
disconnection or
short to GND.
Repair the circuit.
Go to
Step 8
Replace the
transfer
electromagnetic
coil (solenoid
clutch).
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.
Return to Step 8

4B2±55
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
1028 (P1760)The shift on the fly system (front
axle disconnect) works incorrectly.Ð
NOTE: T h e s h i f t o n t h e f l y s y s t e m i s n o t changed
between 2WD and 4WD modes normally.
CAUTION: If code 32 or 33 is also observed, remove
the trouble associated with code 32 or 33 first.
D04R200023

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±56
StepActionYe sNo
11. Turn on the starter switch.
2. Set the transfer to the 2H mode.
Is the battery voltage observed between terminals 23 and 47?
Go to Step 2Go to Step 5
2Is 5V observed between terminals 42 and 47?Go to Step 3Go to Step 6
31. Set the transfer to the TOD mode.
Does the voltage between terminals 23 and 47 indicate 0~1V?
Go to Step 4
The ECU has
failed. Replace
the ECU.
Go to
Step 7
4Does the voltage between terminals 42 and 47 indicate 0V?The phenomenon
is not
reproduced.
Refer to
ªTroubles
intermittently
observedº.
The shift on the
fly system is
failed (refer to
Section 4B1 and
4C
).
Go to
Step 7
5Does the TOD indicator show the 2H mode?The ECU has
failed. Replace
the ECU.
Go to
Step 7
See ªTrouble
Diagnosis
Depending on
The Status of
TOD Indicatorº.
6Set the transfer to the TOD mode.
Does the voltage between terminals 23 and 47 indicate 0~1V?The shift on the
fly system has
failed (refer to
Section 4B1 and
4C
).
Go to
Step 7
The ECU has
failed. Replace
the ECU.
Go to
Step 7
71. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Verify the repair.Return to Step 7

4B2±57
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
1132 (P1761)The on/off signal (ADC) line of the
shift on the fly system (front axle
disconnect) is broken, or the line is
short-circuited to the battery.Ð
NOTE: The on/off signal line of the shift on the fly system
is broken, or the line is short±circuited to the battery.
D04R200023

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±58
StepActionYe sNo
11. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.
3. Disconnect ADC control unit connector (C±41).
Is the continuity established between terminals (C±37) 1 and
(C±41) 4? After checking, connect the ADC control unit
connector.
Go to Step 2
The harness is
broken. Repair
the circuit.
Go to
Step 6
21. Disconnect the battery ground cable.
Is there the continuity between the connector terminal (C±37) 1
and (C±38) 14?The harness is
short-circuited to
VIGN. Repair the
circuit.
Go to
Step 6Go to Step 3
31. Disconnect the battery ground cable.
Is there the continuity between the connector terminal (C±37) 1
and (C±37) 12?The harness is
short-circuited to
VB. Repair the
circuit.
Go to
Step 6Go to Step 4
4Is the resistance between the connector terminal (C±37) 1 and
(C±37) 25 less than 1
?The harness is
short-circuited to
GND. Repair the
circuit.
Go to
Step 6Go to Step 5
51. Turn off the starter switch.
2. Connect ECU connector.
3. Turn on the starter switch.
4. Set the transfer to the 2H mode.
Is the battery voltage observed between the connector (C±37)
terminals 1 and 25?The phenomenon
is not
reproduced.
Refer to
ªTrouble
intermittently
observedº,
or refer to ªSec
4B1 Shift on the
Flyº.
The ECU has
failed. Replace
the ECU.
Go to
Step 6
61. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Verify the repair.Return to Step 6

4B2±59
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
1233 (P1762)The ADC line is short-circuited to
GND.Ð
NOTE:

The on/off signal line of the shift on the fly system is
short±circuited to GND.

The system enters into the fail-safe mode because of
fusing or system protection.
(If a short±circuit is observed on GND, the output to
the on/off signal line becomes 0V.)
D04R200023

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±60
StepActionYe sNo
11. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.
3. Disconnect the ADC control unit connector (C±41).
Is there the continuity between the connector terminal (C±37) 1
and (C±41) 4? After checking, connect the ADC control unit
connector.
Go to Step 2
The harness is
broken. Repair
the circuit.
Go to
Step 4
2Is the resistance between terminals (C±37) 1 and (C±37) 25 less
than 1
?The signal line
circuit of the shift
on the fly system
is short-circuited
to GND. Repair
the circuit.
Go to
Step 4Go to Step 3
31. Connect the ECU connector.
2. Turn on the starter switch.
3. Set the transfer to the 2H mode.
Is the battery voltage observed between the connector (C±37)
terminal 1 and 25?The phenomenon
is not
reproduced.
Refer to
ªTrouble
intermittently
observeº,
or refer to ªSec
4B1 Shift on the
Flyº.
The ECU has
failed.Replace
the ECU.
Go to
Step 4.
41. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Verify the repair.Return to Step 4

4B2±61
DRIVE LINE CONTROL SYSTEM (TOD)
Check flowTrouble codePhenomenonStandard
1341 (P1741)The High-Low motor circuit is
broken.
The circuit is short±circuited to
GND.Ð
43 (P1743)The High-Low motor has moved
consecutive more than 5 sec.Ð
D04R200007