1998 OPEL FRONTERA check engine

4B1–34
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
4. If vacuum is not applicable as much as –400mmHg,
and if there is resistance on the intake side, replace
with a new check valve.
VSV Assembly
Inspect the vehicle side harness as follows:
412RS071
Legend
(1) Grey
(2) Blue
1. Remove connector.
2. Shift transfer lever to 2H and start the engine.
NOTE: Do not move the vehicle while inspection.
3. Make sure that there is continuity in the vehicle side of
harness. If there is no continuity, check transfer shift
switch and wiring.
Inspect both VSVs as follows:
F04RS004
1. With battery not connected (Usual).
A–C:There is continuity
B:Closed
2. With battery connected
A – B:There is continuity
C:Closed
3. If 1) and 2) fail, replace with a new VSV.
Axle Position Switch
412RS048
1. With ball (1) being free
A – B:There is continuity
2. With ball forced into the switch
A – B:No continuity
3. If 1) and 2) fail, replace with a new switch.
Motor Actuator Assembly
Inspect the function of the motor actuator assembly as
follows:

4B2–11 DRIVE LINE CONTROL SYSTEM (TOD)
The CHECK lamp also has the following functions.
D-G MAP recognition and display (The control unit
displays what type of vehicle, diesel or gasoline
vehicle, it recognizes.)
1. Short-circuit the self-diagnostic connector.
2. Turn on the starter switch. (Displays with respect to
the self-diagnosis begin to appear.)
NOTE: Do not start the engine.
3. Shift the transfer lever to the neutral position between
HIGH and 4L.
4. After all the conditions in 1 through 3 above are met,
set the throttle to the WOT (wide open throttle)
position (i.e., full open position). The display of the
self-diagnosis is temporarily suspended, and the
CHECK lamp begins to display that MAP is
recognized by the TPS (throttle position sensor)
according to the current conditions.NOTE: If the TPS has failed, this function might not work.
1. When the control unit recognizes the vehicle as
gasoline type, the CHECK lamp is turned on for five
seconds and this mode is repeated at an interval of
0.3 second.
2. When the control unit recognizes the vehicle as
diesel type, the CHECK lamp is turned off for five
seconds and this mode is repeated at an interval of
0.3 seconds.
3. Upon completion of step 4, the system resumes the
self-diagnosis. (The self-diagnosis is executed
from the beginning.)
5. Turn off the starter switch once. When above
conditions are met again in the future, the TPS MAP
control can be started.
C04RW010

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–14
How to Clear The Trouble Code
The trouble codes saved to the control unit can be deleted
by the following procedure if the starter switch is being in
the OFF position.
1. Shift the transfer lever to the neutral position between
HIGH and 4L, and short-circuit the self-diagnostic
connector.
NOTE: The neutral position between HIGH and 4L refers
to the point that turns off the TOD indicator lamps.
(However, be sure to check the position before
short-circuiting the self-diagnostic connector.)
C07RW011
2. Turn on the starter switch while maintaining the state
of step 1, and step on the brake pedal five times within
five seconds from the first step on. (Note that “five
times” includes the first step on). (The TOD indicator
lamps display the 4L mode whenever the brake pedal
is stepped on.)
3. If the conditions shown in steps 1 and 2 are met, clear
the trouble codes saved to the control unit. (After the
codes are completely deleted, the code 12 that
indicates the normal condition is continuously
displayed.)
Precautions on Diagnosis
Replacement of Control Unit
The control unit itself rarely fails. In most cases, the
harnesses have failed (e.q. short-circuit) to cause
secondary troubles. Other cases include that the cause
has been unknown due to intermittent occurrence of
troubles and the troubles are removed accidentally along
with replacement of control unit, resulting in misjudgment
of cause. Therefore, before replacing the control unit,
check the connector joints and whether the unspecified
current flows in the control unit due to short-circuit
between harnesses.Trouble Intermittently Observed
Troubles intermittently observed are mostly attributable
to temporary imperfect connection of harnesses and
connectors.
When such troubles are found, check the associated
circuit according to the following procedure.
1. Check whether improper connectors are plugged in
or connector terminals are completely engaged.
2. Check whether the terminals are deformed or
damaged. If yes, remove the deformation or damage
and connect the terminals securely.
3. It is likely that wires in the harness are falsely broken.
Therefore, in examination of failed harness circuit,
shake the harness for check to such extent that the
harness will not be damaged.
Test Run of Filed TOD Vehicle
If the TOD indicator lamps experienced faulty operation
even once in the past, the failed portion can be identified
by use of the procedure “Diagnosis from Trouble Codes”
or “Trouble Diagnosis Depending on The Status of TOD
Indicator”. If the troubles that are only recognized as
abnormal phenomena of the vehicle by the driver are
observed, conduct the test run in the following procedure
to reproduce the faulty phenomena and diagnose the fault
for each phenomenon.
1. Start the engine, and check that the TOD indicator
lamps are turned on for about two seconds for initial
check; the CHECK lamp goes off; and the TOD
indicator lamps display the specified drive mode. (If
the CHECK lamp starts blinking, read the trouble
codes and identify the failed portion.)
2. While keeping the vehicle standstill, operate the 4WD
switch and shift the transfer lever to change the
modes: 2H mode
TOD mode4L modeTOD
mode
2H mode. Check that the TOD indicator
lamps correctly display the status whenever the
mode is changed. If the transition status is displayed
during the shift operation, run the vehicle a little to
complete shifting.
3. Slowly start the vehicle in the TOD mode, and add the
power to accelerate to at least 40 km/h and maintain
the speed for about two minutes. Apply the brake to
completely stop the vehicle. Repeat this test pattern
at least three times.
4. Turn the steering to the right end (or left end) in the
TOD mode, and slowly start the vehicle and make a
c i r c l e f i v e t i m e s . N e x t , c o n d u c t t h e s a m e t e s t i n t h e 2 H
mode.
5. Slowly start the vehicle in the TOD mode, and
accelerate to at least 40 km/h. Keep the established
speed, carefully change the mode in the sequence
“TOD mode
2H mode TOD mode” while checking
that the shift is complete in each mode change. After
the test, apply the brake to completely stop the
vehicle.
6. Slowly start the vehicle in the TOD mode, and
accelerate to at least 40 km/h. Apply the brake
strongly so that the ABS works, and completely stop
the vehicle.

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–24
No.NAMECONTENTS
1VIGPower supply (IG)
2N.CNot used
34WD OUT4WD signal output
4SOL (+)Electromagnetic solenoid
5ADC (+)Axle disconnect output
6LIGHTING SWLighting SW input
7BRAKEBrake SW input
84H SW4H SW input
94L SW4L SW input
10AXEL SWAXEL SW input
11ABS INOperation signal input
12TOD SWTOD SW input
13DIAGSelf-diagnosis input
14D-G MAPD-G MAP recognition input (Only V6 engine)
15Ref.Vehicle speed sensor supply
16N.CNot used
17US/JAPDestination recognition input
18COM (–)Vehicle speed sensor GND
19S-GNDSensor GND
20P-GNDPower GND
21TPSThrottle position sensor
22TECH 2TECH 2 output
23Rer. SigRear vehicle speed sensor input
24Frt. SigFront vehicle speed sensor input
25IND.a4WD disply signal a
26IND.b4WD display signal b
27IND.c4WD display signal c
28IND.AUTOAUTO display output
29IND RrRear display output
30CHECKTOD warning lamp

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–26
Checking Failed TOD Control Unit Pin
NOTE:
1. Unplug the ECU connector and the pins, unless
otherwise specified.2. Before removing the ECU, turn off the ignition switch.
3. If the standard values are not observed, check the
pins with other testers.
Check
Pin
No.Circuit to be
testedIgnition
Switch
PositionEngine
StateMultimeter
Scale/
RangeMeasure
between Pin
NumberStandard ValveNote
14D-G MAPOFFSTOP14, 19Continuity : OK
(Gasoline)
20P-GNDOFFSTOP20, 19Continuity : OK
19GNDOFFSTOP19, GNDContinuity : OK
84H SWOFFSTOP8, 19No continuity (high,
4L) and continuity
(N) : OK
94L SWOFFSTOP9, 19No continuity (high)
and continuity (4L,
N) : OK
10AXLE SWONRUN10, 19Continuity : OKRemove ECU and start the engine. Move
the vehicle forth and back to connect axle
surely.
13DIAGOFFSTOP13 (TOD), 8
(DLC Con-
nector)Continuity : OKDLC connector terminal 8
25IND.aONSTOPDCV25 (+), 19 (–)8.0 14.5 VLighting SW ON : 0V
Lighting SW OFF : 8.0 14.5 V
26IND.bONSTOPDCV26 (+), 19 (–)8.0 14.5 V
27IND.cONSTOPDCV27 (+), 19 (–)8.0 14.5 V
30CHECK
LAMPONSTOPDCV30 (+), 19 (–)8.0 14.5 V
11ABS INONSTOPDCV11 (+), 19 (–)11 . 5 14.5 V
15Ref.ONSTOPDCV15 (+), 19 (–)5 9 VConnect ECU
24Ft.(+)ONSTOPDCV24 (+), 19 (–)0.7 6 VConnect ECU (off one tooth of speed
sensor ring) and move the vehicle making
sure of voltage change.
23Rr.(+)ONSTOPDCV23 (+), 19 (–)0.7 6 VConnect ECU (off one tooth of speed
sensor ring) and move the vehicle making
sure of voltage change.
18COM(-)ONSTOPDCV18 (+), 19 (–)0VConnect ECU
1VigONSTOPDCV1 (+), 19 (–)8 14.5 V
7BRAKEOFFSTOPDCV7 (+), 19 (–)8 14.5 VPress brake pedal
21TPSONSTOPDCV21 (+), 19 (–)0.2 4.6 VStep on the accelerator pedal and make
sure that voltage changes.
34WD OUTOFFSTOP3, 197 12 kDisconnect battery GND terminal
5ADC(+)OFFSTOP5, 1910 30 Disconnect battery GND terminal
4SOL(+)OFFSTOP4, 191.0 5.0 Disconnect battery GND terminal
12TOD SWONSTOPDCV12 (+), 19 (–)SW OFF : 0 V
SW ON : 8.0 14.5 VSW OFF : Contact point open
SW ON : Contact point close
6LIGHTINGONSTOPDCV6 (+), 19 (–)SW OFF : 8.0 14.5
V
SW ON : 0 V
28AUTO INDIONSTOPDCV28 (+), 19 (–)TOD : 0 V
2H & 4L : 8.0 14.5
VLighting SW ON : 0V
Lighting SW OFF : 8.0 14.5 V
29RR INDIONSTOPDCV29 (+), 19 (–)0 V
17US/JAPOFFSTOP17 (+), 19 (–)No continuity : OK

DRIVE LINE CONTROL SYSTEM (TOD) 4B2–30
Diagnostic Trouble Codes
CodeItemDiagnosisCheck flow No.
12Start codeNormal—
13RefShorted GND6
14Front speed sensorInput abnormality (open, sig or com)2
15RefShorted VB6
16Front speed sensorInput abnormality3
21TPSShorted or disconnected wiring, abnormality in
input7
23ECUCPU abnormality1
24Rear speed sensorInput abnormality (open, sig or com)5
25CHECK lampShorted14
26EMC (+)Shorted GND10
27Rear speed sensorInput abnormality4
28ADC (+) & AXLE SWOutput abnormality11
31EMC (+)Shorted or disconnected coil/wiring9
32ADC (+)Shorted or disconnected coil/wiring12
33ADC (+)Shorted GND13
34D-G MAPInput abnormality8
35CHECK lampShorted or disconnected wiring14
36ECUCPU abnormality1
37ECUCPU abnormality1
38ECUCPU abnormality1
TPS : Throttle Position Sensor
EMC : Electromagnetic coil
ADC : Shift on the fly (Axle Dis Connect)
D-G MAP : Discrimination engine type

4B2–33 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Start the engine.
2. Select 4H (TOD) mode.
Is the memory except DTC 14?
Go to Step 3Go to Step 2
2Is the continuity harness of terminal 24 (vehicle side terminal of
the front speed sensor)?Replace speed
sensor.
Go to Step 6
Repair the circuit.
Go to Step 6
3Is the memory DTC 24?
Go to Step 4
Refer to other
trouble check
flow.
Go to Step 2
4Is the continuity between harness of terminal 23 and 24 (vehicle
side terminal of the front and rear speed sensor)?
Go to Step 5
Repair the circuit.
Go to Step 6
5Is the continuity between harness of terminal 18 and 15 (vehicle
side terminal of the speed sensor COM and ref)?Replace front and
rear speed
sensor.
Go to Step 6
Repair the circuit.
Go to Step 6
61. Check that all the parts are mounted.
2. Clear the trouble code.
Is the step complete?
Repeat the
“Diagnosis Flow”.
The trouble is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Return to Step 6

4B2–39 DRIVE LINE CONTROL SYSTEM (TOD)
StepActionYe sNo
11. Start the engine.
2. Select 4H (TOD) mode.
Is the memory except DTC 24?
Go to Step 3Go to Step 2
2Is the continuity harness of terminal 23 (vehicle side terminal of
the rear speed sensor)?Replace speed
sensor.
Go to Step 6
Repair the circuit.
Go to Step 6
3Is the memory DTC 14?
Go to Step 4
Refer to other
trouble cheek
flow.
Go to Step 2
4Is the continuity between harness of terminal 23 and 24 (vehicle
side terminal of the front and rear speed sensor)?
Go to Step 5
Repair the circuit
Go to Step 6
5Is the continuity between harness of terminal 15 and 18 (vehicle
side terminal of the speed sensor COM and ref)?Replace front and
rear speed
sensor.
Go to Step 6
Repair the circuit.
Go to Step 6
61. Check that all the parts are mounted.
2. Clear the trouble code.
Is the step complete?
Repeat the
“Diagnosis Flow”.
The trouble is not
reproduced.
Refer to
“Troubles
intermittently
observed”.
Return to Step 6