Opel Frontera UBS. Service manual — part 1038
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–92
Step
Action
Yes
No
1
Turn on the starter switch.
When the transfer lever is shifted to the high position, is 5V
observed between terminals 9 and 19 (4L switch)?
Go to Step 2
Go to Step 4
2
When the transfer lever is shifted to the neutral position, is 0V
observed between terminals 9 and 19 (4L switch)?
Go to Step 3
Go to Step 4
3
When the transfer lever is shifted to the 4L position, is 0V
observed between terminals 9 and 19 (4L switch)?
The ECU has
failed. Replace
the ECU.
Go to Step 13
Go to Step 4
4
1. Turn off the starter switch.
2. Disconnect the ECU connector.
3. Turn on the starter switch.
When the transfer lever is shifted to the high position, is 12V
observed between terminals (B–68)4 and (B–67)11?
Go to Step 5
Go to Step 7
5
When the transfer lever is shifted to the neutral position, is 0V
observed between terminals (B–68)4 and (B–67)11?
Go to Step 6
Go to Step 7
6
When the transfer lever is shifted to the 4L position, is 0V
observed between terminals (B–68)4 and (B–67)11?
The 4L switch
circuit is
short-circuited on
battery between
ECU and
transfer.Repair
the circuit.
Go to Step 13
Go to Step 7
7
Turn off the starter switch.
When the transfer lever is shifted to the high position, is the
continuity established between terminals (B–68)4 and (B–67)11?
Go to Step 12
Go to Step 8
8
When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between terminals
(B–68)4 and (B–67)11?
Go to Step 9
Go to Step 10
9
When the transfer lever is shifted to the 4L position, is the
continuity established between terminals (B–68)4 and (B–67)11?
The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 11
10
1. Disconnect the A–3 connector.
When the transfer lever is shifted to the neutral position between
high and 4L, is the continuity established between transfer
connector terminals (A–3)12 and GND?
Wires are broken
between transfer
connector
(A–3)12 and
connector
(B-68)4.Repair
the circuit.
Go to Step 13
Repair the
transfer
assembly.
Go to Step 13
11
When the transfer lever is shifted to the 4L position, is the
continuity established between transfer connector terminals
(A–3)12 and GND?
Wires are broken
between transfer
connector
(A–3)12 and
connector
(B-68)4.Repair
the circuit.
Go to Step 13
Repair the
transfer
assembly.
Go to Step 13
4B2–93
DRIVE LINE CONTROL SYSTEM (TOD)
Step
No
Yes
Action
12
When the transfer lever is shifted to the high position, is the
continuity established between transfer connector terminals
(A–3)12 and GND?
Repair the
transfer
assembly.
Go to Step 13
Wires are broken
between transfer
connector
(A–3)12 and
connector
(B-68)4.Repair
the circuit.
Go to Step 13
13
Check that all the parts are mounted.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 13
DRIVE LINE CONTROL SYSTEM (TOD)
4B2–94
Chart D–2
The 4L switch circuit is short-circuited to GND.
Function of circuit
—
Fail condition
The 4L mode is displayed even in the 2H or TOD.
Indicator lamp status
Transfer position
HIGH (2H or TOD)
D04RY00064
4B2–95
DRIVE LINE CONTROL SYSTEM (TOD)
D04RY00065
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