1998 OPEL FRONTERA ECU

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–60
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 “Trouble
intermittently
observed”.
21. 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 3Go to Step 5
31. 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 4Go to Step 6
4Is the battery voltage always observed between terminals 4 and
20?The harness is
short–circuited on
the battery.
Repair the circuit.
Go to
Step 8Go to Step 6
51. Disconnect the A–3 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 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 (B–67) terminal 4 and 12
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–3) 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
“Diagnosis Flow”.
Return to Step 8

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–62
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
0.1 to 1.0 V?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
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
“Diagnosis Flow”.
Return to Step 4

4B2–65 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn on the starter switch.
2. Set the transfer to the 2H mode.
Is the battery voltage observed between terminals 5 and 19?
Go to Step 2Go to Step 5
2Is 5V observed between terminals 10 and 19?Go to Step 3Go to Step 6
31. Set the transfer to the high (TOD) mode.
Does the voltage between terminals 5 and 19 indicate 0V?
Go to Step 4
The ECU has
failed. Replace
the ECU.
Go to Step 7
4Does the voltage between terminals 10 and 19 indicate 0V?The phenomenon
is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
The shift on the
fly system is
failed (refer to
Section 4B and
4C of Chassis
Repair Manual).
5Does the TOD indicator show the 2H mode?The ECU has
failed. Replace
the ECU.
Go to Step 7See “Trouble
Diagnosis
Depending on
The Status of
TOD Indicator”.
6Set the transfer to the high (TOD) mode.
Does the voltage between terminals 5 and 19 indicate 0V?The shift on the
fly system has
failed (refer to
Section 4B1 and
4C of Chassis
Repair Manual).
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?
Repeat the
“Diagnosis Flow”.
Return to Step 7

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–68
StepActionYe sNo
11. Turn off the starter switch.
2. Disconnect the ECU connector from ECU.
Is the continuity established between terminals (B–67)5 and
(B–67)11?
Go to Step 2
The harness is
broken. Repair
the circuit.
Go to Step 3
2Does the voltage between terminals (B–67) 5 and (B–67) 11
indicate 0V?
Go to Step 3
The battery is
short-circuited.
Repair the circuit.
Go to Step 4
31. 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 terminals 5 and 19?The phenomenon
is not reproduced
Refer to
“Troubles
intermittently
observed”.
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?
Repeat the
“Diagnosis Flow”.
Return to Step 4

4B2–71 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) 5 and (B–67) 11
meet the standard, 17 is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Go to Step 2
2Is the resistance between terminals (B–67) 5 and (B–67) 11 R<2
ohms?The signal line
circuit of the shift
on the fly system
is short-circuited
to GND. Repair
the circuit.
Go to Step 4
Go to Step 3
3Is the resistance between terminals (B–67) 5 and (B–67) 11 R=
9
7ohms?
The signal line
circuit of the shift
on the fly system
is layer
short-circuited*.
Replace the valve
(VSV).
Go to Step 4
Go to Step 4
41. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 4
*Layer short-circuit : The coil is damaged by overcurrent.

4B2–73 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Turn on the starter switch.
Is the CHECK lamp always turned on?
Go to Step 2Go to Step 3
21. Turn off the starter switch.
2. Disconnect the ECU connector.
3. Turn on the starter switch.
Is the CHECK lamp always turned on?The CHECK
circuit is
short-circuited to
GND. Repair the
circuit.
Go to Step 7
The ECU has
failed. Replace
the ECU.
Go to Step 7
3Turn on the starter switch.
Is the CHECK lamp always turned off?
Go to Step 4Go to Step 6
4Turn on the starter switch.
Is the battery voltage observed between terminals 30 and 19?
Go to Step 5
The CHECK
circuit wires are
broken or the
CHECK lamp is
failed. Repair the
circuit.
Go to Step 7
5Turn off the starter switch.
Is the battery voltage observed between terminals 30 and 19?The battery is
short–circuited.
Repair the
CHECK lamp
circuit.
Go to Step 7
The ECU has
failed. Replace
the ECU.
Go to Step 7
6Turn on the starter switch.
Does the CHECK lamp go off two seconds after?The phenomenon
is not
reproduced.Refer
to “Troubles
intermittently
observed”.
Go to Step 7
71. Check that all the parts are mounted.
2. Clear the trouble code.
Is this step complete?
Repeat the
“Diagnosis Flow”.
Return to Step 7

4B2–75 DRIVE LINE CONTROL SYSTEM (TOD)
Chart AIndicator drive circuit
Function of circuitThe circuit informs the indicator of the working condition of the ECU.
Fail conditionAll the TOD indicator lamps and CHECK lamp are lit, and go off momentarily at an
interval of about two seconds.
Indicator lamp status
—
Transfer position2H, TOD, 4L—
D04RY00114

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–76
D04RY00115
StepActionYe sNo
1Turn on the starter switch.
Is the battery voltage observed between terminals 1 and 19?The ECU has
failed. Replace
the ECU.
Go to Step 2
Check the battery
circuit.
Go to Step 2
2Check that all the parts are mounted.
Is this step complete?Repeat the
“Diagnosis Flow”.
Return to Step 2