ISUZU AXIOM 2002 Service Repair Manual

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±82
Chart C±14H switch circuit is short-circuited to GND.
Function of circuitÐ
Fail conditionWhen the TOD switch is selected to 4L from TOD, all the indicator lamps are turned off.
Indicator lamp state
TOD switch position4L

4B2±83
DRIVE LINE CONTROL SYSTEM (TOD)
D04R200022

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±84
StepActionYe sNo
11. Turn on the starter switch.
2. The car stops, the AT selector is N position and the brake is
applied.
When the TOD switch is changed to the TOD position, is 12V
observed between terminals 31 and 47 (4H switch)?
Go to Step 2Go to Step 9
21. The car stops the AT selector is N position and the brake is
applied.
When the TOD switch is changed to the 4L position, is 12V
observed between terminals 31 and 47 (4H switch)?
Go to Step 3Go to Step 9
31. Turn off the starter switch.
Is there the continuity terminal 14 and 7?
Go to Step 4
Replace the TOD
indicator lamp
bulb, or repair the
circuit.
Go to
Step 13
4Is there the continuity between the terminals 14 and 19?
Go to Step 5
Replace the TOD
indicator lamp
bulb, or repair the
circuit.
Go to
Step 13
5Is there the continuity between the terminal 14 and 8?
Go to Step 6
Replace the TOD
indicator lamp
bulb, or repair the
circuit.
Go to
Step 13
61. Turn on the starter switch.
2. The car stops the AT selector is N position and the brake is
applied.
When the TOD switch is changed to the 4L position, is 0V
observed between terminal 7 and 47? (for 2 seconds after the
starter switch ON) ?
Go to Step 7
The ECU has
frailed. Replace
the ECU.
Go to
Step13
7Is 0V observed between terminal 19 and 47? (for 2 seconds after
the starter switch ON)
Go to Step 8
The ECU has
failed. Replace
the ECU.
Go to
Step 13
8Is 0V observed between terminal 8 and 47? (for 2 seconds after
the starter switch ON)The phenomenon
is not
reproduced.
Refer to
ªTrouble
intermittently
observedº.
The ECU has
failed. Replace
the ECU.
Go to
Step 13
91. The car stops, the AT selector is N position, and the brake is
applied.
2. The TOD switch is changed to the TOD (or 2H) position.
3. Turn off the starter switch.
4. Disconnect the ECU connector (C±37).
Is there the continuity between the connector (C±37) terminal 9
and 25?
Go to Step 11Go to Step 10

4B2±85
DRIVE LINE CONTROL SYSTEM (TOD)
StepNo Ye s Action
101. Connect the ECU connector (C±37) and turn on the starter
switch.
2. The car stops, the AT selector is N position, and the brake is
applied.
3. Change the TOD switch to the 4L position.
4. Turn off the starter switch and disconnect the ECU connector
(C±37).
Is there the continuity between the connector (C±37) terminal 9
and 25?
Go to Step 11
The ECU has
failed. Replace
the ECU.
Go to
Step 13
111. Disconnect the connector (H±7).
Is the continuity established between the transfer connector
terminals (H±7)4 and (C±37) 9?
Go to Step 12
The harness is
broken between
terminal (H±7) 4
and (C±37) 9.
Repair the circuit.
Go to
Step 13
121. Connect the connector (H±7).
2. Disconnect the connector (A±1).
Is there the continuity between the connector terminal (A±1) 4 and
(C±37) 9?
Repair the
transfer.
Go to
Step 13
The harness
between the
connector
terminal (C±37) 9
and (A±1) 4 is
short-circuited to
GND. Repair the
circuit.
Go to
Step 13
13Check that all the parts are mounted.
Is this step complete?
Verify the repair.Return to Step 13

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±86
Chart D±14L switch circuit wires are broken or the battery circuit is short-circuited.
Function of circuitÐ
Fail conditionWhen the TOD switch is changed to the 4L position, the indicator 4L mode goes on and
off.
Indicator lamp state
TOD switch position4L

4B2±87
DRIVE LINE CONTROL SYSTEM (TOD)
D04R200022

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±88
StepActionYe sNo
11. Turn on the starter switch.
2. The car stops, the AT selector is the N position, and the brake
is applied.
When the TOD switch is changed to the TOD (or 2H) position, is
12V observed between terminals 44 and 47 (4L switch)?
Go to Step 2Go to Step 4
21. The car stops, the AT selector is the N position, and the brake
is applied.
When the TOD switch is changed to the 4L position, does the
transfer become the 4L state?
Go to Step 3
Refer to
ªDiagnosis from
symptomº.
3Is 0V observed between the terminal 44 and 47?The ECU has
failed.Replace
the ECU.
Go to
Step 10Go to Step 10
41. The car stops, the AT selector is the N position, and the brake
is applied.
When the TOD switch is changed to the TOD (or 2H) position, is
12V observed between the connector (C±37) terminal 22 and 25?
Go to Step 5Go to Step 6
51. Turn off the starter switch and connect the EUC connector.
2. The car stops, the AT selector is the N position, and the brake
is applied.
When the TOD switch is changed to the 4L position, is 0V
observed between terminals (C±37) 22 and (C±37) 25 (4L
switch)?The phenomenon
is not
reproduced.
Refer to
ªTrouble
intermittently
observedº.
Go to Step 6
61. Turn off the starter switch and connect ECU connector.
2. Turn on the starter switch.
3. The car stops, the AT selector is the N position, and the brake
is applied.
4. Change the TOD switch to the TOD (or 2H) position.
5. After the transfer has changed to the TOD (or 2H) mode, turn
off the starter switch and disconnect the ECU connector
(C±37).
Is there the continuity between the connector (C±37) terminal 22
and 25?
Go to Step 9Go to Step 7
71. Turn off the starter switch and connect the ECU connector.
2. Turn on the starter switch.
3. The car stops, the AT selector is the N position, and the brake
is applied.
4. Change the TOD switch to the 4L position.
5. After the transfer has changed to the 4L mode, turn off the
starter switch.
6. Disconnect the ECU connector.
Is there the continuity between the connector (C±37) terminal 22
and 25?
The phenomenon
is not
reproduced.
Refer to
ªTrouble
intermittently
observedº.
Go to Step 8
81. Turn off the starter switch and connect the ECU connector.
2. Turn on the starter switch.
3. The car stops, the AT selector is the N position, and the brake
is applied.
4. Change the TOD switch to the TOD (or 2H) position.
5. After the transfer has changed to the TOD (or 2H) mode, turn
off the starter switch.
6. Disconnect the transfer connector (A±1).
Is there the continuity between the connector terminal (A±1) 12
and GND?
Repair the
transfer.
Go to
Step 10
Repair the circuit
between (C±37)
22 and (A±1) 12.
Go to
Step 10

4B2±89
DRIVE LINE CONTROL SYSTEM (TOD)
StepNo Ye s Action
91. Turn off the starter switch and connect the connector (A±1).
2. Turn on the starter switch.
3. The car stops, the AT selector is N position, and the brake is
applied.
4. Change the TOD switch to the 4L position.
5. After the transfer has changed to the 4L mode, turn off the
starter switch.
6. Disconnect the transfer connector (A±1).
Is there the continuity between the connector terminal (A±1) 12
and GND?
Repair the circuit
between
(C±37)22 and
(A±1)12.
Go to
Step 10
Repair the
transfer.
Go to
Step 10
10Check that all the parts are mounted.
Is this step complete?
Verify the repair.Go to Step 10

DRIVE LINE CONTROL SYSTEM (TOD) 4B2±90
Chart D±2The 4L switch circuit is short-circuited to GND.
Function of circuitÐ
Fail conditionWhen the TOD switch is changed to the 2H or TOD position, the indicator 2H or TOD
mode goes on and off.
Indicator lamp state
TOD switch position2H or TOD

4B2±91
DRIVE LINE CONTROL SYSTEM (TOD)
D04R200022