Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 639
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–76
Step
Action
Yes
No
1
Start the engine.
When the transfer lever is shifted to the neutral position between
high and 4L, is 5V observed between terminals 42 and 46?
Go to Step 2
Go to Step 7
2
When the transfer lever is shifted to the high position and 4WD
Auto switch selected to 4WD position, is 0V observed between
terminals 42 and 46?
Go to Step 3
Go to Step 7
3
When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 42 and 46?
Go to Step 4
Go to Step 7
4
Shift the transfer lever to the 4L position.
Is 0V observed between terminals 17 and 46?
Go to Step 5
The ECU has
failed. Replace
the ECU.
Go to Step 19
5
Is 0V observed between terminals 6 and 46?
Go to Step 6
The ECU has
failed. Replace
the ECU.
Go to Step 19
6
Is 0V observed between terminals 18 and 46?
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 19
The ECU has
failed. Replace
the ECU.
Go to Step 19
7
When the transfer lever is shifted to the high position and 4WD
Auto Switch selected to the 2WD position, is the battery voltage
observed between terminals 23 and 46?
Go to Step 8
Go to Step 11
8
When the transfer lever is shifted to the middle position between
High and 4L, is the battery voltage observed between terminals
23 and 46?
Go to Step 9
Go to Step 11
9
When the transfer lever is shifted to the high position (TOD mode),
is 0V observed between terminals 23 and 46?
Go to Step 10
Go to Step 11
10
When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 23 and 46?
Go to Step 12
Go to Step 11
11
Is any of the trouble codes 28(P1760), 32(P1761) and 33(P1762)
recorded?
Examine the
trouble based on
“Diagnosis from
Trouble Codes”.
The ECU has
failed. Replace
the ECU.
Go to Step 19
12
1. Turn off the starter switch.
2. Disconnect the ECU connector.
Does the resistance between terminals (B–48)1 and (B–48)24
meet the standard, 17< R < 25 ohm?
Go to Step 13
Repair the circuit
or replace the
VSV.
Go to Step 19
13
1. Turn on the starter switch.
When the 4WD Auto Switch is select to the 2WD position, is the
battery voltage supplied to each VSV?
Go to Step 14
Repair the circuit
or replace the
VSV.
Go to Step 19
14
When the transfer lever is shifted to the middle position between
High and 4L, is the battery voltage supplied to each VSV?
Go to Step 15
Repair the circuit
or replace the
VSV.
Go to Step 19
15
When the transfer lever is shifted to the high position and 4WD
Auto Switch selected to 4WD position, is 0V observed on each
VSV?
Go to Step 16
Repair the circuit
or replace the
VSV.
Go to Step 19
4B2–77
DRIVE LINE CONTROL SYSTEM (TOD)
Step
No
Yes
Action
16
When the transfer lever is shifted to the 4L position, is 0V
observed on each VSV?
Go to Step 17
Repair the circuit
or replace the
VSV.
Go to Step 19
17
Is the vacuum pressure supplied to the VSV?
Go to Step 18
Repair the
vacuum system.
Go to Step 19
18
Can the single AXLE switch enable and disable the continuity?
Repair the shift
on the fly system
(refer to
“Driveline Control
System”).
Go to Step 19
Replace the
AXLE switch
(refer to
“Driveline Control
System”).
Go to Step 19
19
Check that all the parts are mounted.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 19
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–78
Chart E–2
The AXLE switch circuit is short-circuited to GND.
Function of circuit
—
Fail condition
Even after the 4WD Auto Switch is select to the 2WD position, the 2WD mode is not en-
abled. (The transition status is not removed.)
Indicator lamp status
Transfer lever position
High
4WD Auto Switch
D04RY00007
4B2–79
DRIVE LINE CONTROL SYSTEM (TOD)
Step
Action
Yes
No
1
Start the engine.
When the transfer lever is shifted to the middle position between
High and 4L, is 5V observed between terminals 42 and 46?
Go to Step 2
Go to Step 7
2
When the transfer lever is shifted to the high position and 4WD
Auto Switch selected to 4WD position, is 0V observed between
terminals 42 and 46?
Go to Step 3
Go to Step 7
3
When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 42 and 46?
Go to Step 4
Go to Step 7
4
Select the 4WD Auto Switch to the 2WD position.
Is 12V observed between terminals 17 and 46?
Go to Step 5
The ECU has
failed. Replace
the ECU. Go to
Step 19
5
Is 12V observed between terminals 6 and 46?
Go to Step 6
The ECU has
failed. Replace
the ECU. Go to
Step 19
6
Is 12V observed between terminals 18 and 46?
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
The ECU has
failed. Replace
the ECU.
Go to Step 19
7
When the 4WD Auto Switch is select to the 2WD position, is the
battery voltage observed between terminals 23 and 46?
Go to Step 8
Go to Step 11
8
When the transfer lever is shifted to the middle position between
High and 4L, is the battery voltage observed between terminals
23 and 46?
Go to Step 9
Go to Step 11
9
When the transfer lever is shifted to the high position and 4WD
Auto Switch selected to 4WD position, is 0V observed between
terminals 23 and 46?
Go to Step 10
Go to Step 11
10
When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 23 and 46?
Go to Step 12
Go to Step 11
11
Is any of the trouble codes 28(P1760), 32(P1761) and 33(P1762)
recorded?
Examine the
trouble based on
“Diagnosis from
Trouble Codes”.
The ECU has
failed. Replace
the ECU.
Go to Step 19
12
1. Turn off the starter switch.
2. Disconnect the ECU connector.
Does the resistance between terminals (B–48)1 and (B–48)24
meet the standard, 17< R < 25 ohm?
Go to Step 13
Repair the circuit
or replace the
VSV.
Go to Step 19
13
1. Connect the ECU connector.
2. Turn on the starter switch.
When the 4WD Auto Switch is select to the 2WD position, is the
battery voltage supplied to each VSV?
Go to Step 14
Repair the circuit
or replace the
VSV.
Go to Step 19
14
When the transfer lever is shifted to the middle position between
High and 4L, is the battery voltage supplied to each VSV?
Go to Step 15
Repair the circuit
or replace the
VSV.
Go to Step 19
15
When the transfer lever is shifted to the high position and 4WD
Auto Switch selected to 4WD position, is 0V observed on each
VSV?
Go to Step 16
Repair the circuit
or replace the
VSV.
Go to Step 19
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