1998 OPEL FRONTERA Back

AUTOMATIC TRANSMISSION (AW30-40LE) 7A–23
INTERMITTENT CONDITIONS
If the Tech2 displays a code as intermittent, or if after a
test drive a code does not reappear, the problem is most
likely a faulty electrical connection or loose wiring.
Terminals should always be the prime suspect.
Intermittent rarely occur in sophisticated electronic
components such as the Transmission Control Module
(TCM).
When an intermittent problem is encountered, check
suspect circuits for:
• Poor terminal to wire connection.
• Terminals not fully seated in the connector body
(backed out).
• Improperly formed or damaged terminals.
• Loose, dirty, or corroded ground connections.
HINT: Any time you have an intermittent in more than
one circuit, check whether the circuits share a
common ground connection.
• Pinched or damaged wires.
• Electro-Magnetic Interference (EMI)
HINT: Check that all wires are properly routed away
from spark plug wires, distributor wires, coil,
and generator. Also check for improperly
installed electrical options, such as lights, 2-
way radios, etc.
Use the F2: SNAPSHOT mode of the Tech2 to help
isolate the cause of an intermittent fault. The snapshot
mode will record information before and after the
problem occurs. Set the snapshot to "trigger" on the
suspect code (or codes) or, if you notice the repor ted
symptom during test drive, trigger the snapshot
manually.
After the snapshot has been triggered, command the
Tech2 to play back the flow of data recorded from each
of the various sensors. Signs of an intermittent fault in a
sensor circuit are a sudden unexplainable jump in data
values out of the normal range.

7A–26 AUTOMATIC TRANSMISSION (AW30-40LE)
DTC P0120 (FLASHING CODE 21) ANALOG THROTTLE SIGNAL FAILURE (VTH)
D07RY00023Circuit description:
When the signal of the engine throttle position sensor
located on the accelerator pedal is supplied to the TCM,
the TCM judges the opening condition of the throttle.
The shift point of the transmission is determined by this
opening condition of the throttle.
Fail-safe control:
The TCM controls fail-safe by detecting analog throttle
signal (VTH) failure.
Failure detection:
•When the throttle input voltage is detected less than
0.112V or more than 4.417V for 2.0 seconds.
Contents of control:
At failure detection
•Throttle opening for line pressure control ... Throttle
opening 100%
•Throttle opening for shift control ... Throttle opening
0%
•Lock-up control inhibit
•Up hill and down hill control inhibit
•Squat control inhibit
At failure decision
Executes following items in addition to above control
items at failure detection.
•Blinks "CHECK TRANS" lamp
•Stores the failure information in failure-memory
Conditions of turning "CHECK TRANS" lamp off:
Turns “CHECK TRANS” lamp off when judged 0km/h by
output revolution sensor after throttle signal input voltage
is detected more than 0.112V and less than 4.717V.
(however, uses 0 km/h judgment by back-up vehicle
speed at output revolution failure)Reversion conditions from fail-safe:
At failure detection
Immediately recovers when the throttle input voltage
is detected more than 0.112V and less than 4.717V.
At failure decision
Recovers at the same time as the conditions of
turning “CHECK TRANS” lamp off are satisfied.
Test description:
The following numbers correspond to circled numbers on
the diagnostic char t.
(1) Check that the throttle input voltage is 0.25 to 0.45V.
(2)At this test, check that as the throttle opens, the
voltage goes up and that the voltage reaches 3.74 to
4.56V at the full open status.
(3) Check the power supply voltage (4.75 – 5.25V) of the
throttle position sensor.
Diagnostic aids:
An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside
the insulation. Inspect related harness connector for
backed out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal
to wire connection and damaged harness.

7A–28 AUTOMATIC TRANSMISSION (AW30-40LE)
DTC P0502 (FLASHING CODE 24) SPEED METER SENSOR FAILURE (SP1)
D07RY00024Circuit description:
Speed information is provided by the speed meter sensor
to the meter.
In the meter, the pulses of the speed meter sensor are
converted to speed signals (pulses), and these signals
are output to the TCM. The TCM converts these pulse
voltages to km/h signals.
Fail-safe control:
The TCM controls fail-safe by detecting speed meter
signal failure.
Failure detection:
• When not even 1 pulse is input in the speed meter
signal during the time 100 pulses are input in the
output revolution sensor signal.
• When not even 1 pulse is input in the speed meter
signal during the time 27 pulses are input in the
output revolution sensor signal.
Contents of control:
At failure detection
•Keeps the condition of transfer (High/Low judgment)
just before detection until vehicle speed is 0km/h,
and changes shift map to L4 map (3
4 UP None) at
vehicle speed is 0km/h.
•Uses high oil temperature map according to shift
map priority at correct oil temperature control.
• Up hill and down hill control inhibit.
• Stores the failure information in failure -memory.
• The failure detection of oil temperature sensor inhibit
At failure decision
Executes following items in adition to above control
items at failure detection.
•Blinks "CHECK TRANS" lamp
Conditions of turning "CHECK TRANS" lamp off:
Turns "CHECK TRANS" lamp off when judged 0km/h by
speed meter sensor after more than 1 pulse are input in
the speed meter signal during the time 27 pulses areinput in the output revolution sensor.
Reversion conditions from fail-safe:
At failure detection and decision
Recovers at the same time as the conditions of turning
“CHECK TRANS” lamp off are satisfied.
Test description:
The following numbers correspond to circled numbers on
the diagnostic char t.
(1) The cause of DTC P0502 setting is due to the
operation fault of the speed meter.
(2) Speed signals are output from the meter. The sensor
power supply is given from the TCM.
Diagnostic aids:
An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside
the insulation. Inspect related harness connector for
backed out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal
to wire connection and damaged harness.

7A–30 AUTOMATIC TRANSMISSION (AW30-40LE)
DTC P0705 (FLASHING CODE 17) GEAR SELECTOR FAILURE (PRND2L)
D07RY00022Circuit description:
The neutral start switch gives the signals related to the
selector lever position (PRND2L) to the Transmission
Control Module (TCM). The neutral star t switch turns on
when the select lever is shifted to the P, R, N, D, 2 or L
range. The neutral star t switch, which is connected to the
starter switch circuit, is available only when the select
lever is in the P or N range
The neutral start switch is connected to the transmission
manual shaft and installed in the transmission case.
Fail-safe condition:
The TCM controls fail-safe by detecting selector position
switch fail ure.
Failure detection:
(1) OPEN:
• When all switches are OFF
• When the failure criteria continues for 30 seconds
if the vehicle speed which is calculated by output
revolution sensor is more than 30 km/h and the
engine revolution is more than 1500 rpm.
(2) SHORT:
• When more than two switches are ON at the same
time.
• When the failure criteria condition for 10 seconds.
Contents of control:
At failure detection
(1) OPEN: D range judgment
(2) SHORT: Judged by priority D>2>L>R>N>P
•Up hill and down hill control inhibit
•Winter mode inhibitAt failure decision
Excutes following items in addition to above control
items at failure detection.
•Blinks "CHECK TRANS" lamp
•Stores the failure information in failure-memory
•Reverse lockout control inhibit
Conditions of turning “CHECK TRANS” off:
Turns “CHECK TRANS” lamp off when only one of all
switches is ON.
Reversion conditions from fail-safe:
Turns “CHECK TRANS” lamp off when only one of all
switches is ON.
Test description:
The following numbers correspond to circled numbers on
the diagnostic char t.
(1) It is judged whether the input signal received from
the neutral star t switch by the TCM is proper or not.
(2)The power status of the neutral start switch is
checked.
(3) The continuity between neutral star t switch terminals
and the continuity of the wire connected to the
neutral start switch are checked.
Diagnostic aids:
An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside
the insulation. Inspect related harness connector for
backed out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal
to wire connection and damaged harness.

7A–32 AUTOMATIC TRANSMISSION (AW30-40LE)
DTC P0710 (FLASHING CODE 16) OIL TEMPERATURE SENSOR FAILURE (OT2)
D07RY00021Circuit description:
The oil temperature sensor is a thermistor sensor that is
installed in the transmission case and converts
temperature changes into continuous electric signals,
then outputs them to the Transmission Control Module
(TCM). When the ATF temperature is low, the resistance
of the sensor (thermistor) goes up, so that the voltage of
the TCM signal becomes high.
As the ATF is gradually warmed, the resistance of the
sensor goes down and the voltage becomes low. At the
normal operating ATF temperature (80
C/176F) of the
transmission, the voltage of the TCM is about 3.7V.
Fail-safe condition:
The TCM controls fail-safe by detecting oil temperature
sensor failure.
Failure detection:
Short detection
• When the A/D value is detected less than 10
(220
C) for 5 minutes continuously while normal
judgment is not satisfied from ignition on.
Open detection
• After 15 minites passed when the engine revolution
is more than 400 rpm and the selector position
switch is selected on R, D, 2, L range.
• When the change of the A/D value from engine
star t is less than 15 and the minnum A/D value is
more than 1000 (-10
C) from engine star t.
Contents of control:
At failure detection
• Changes shift map to HOT2 map
• Controls as A/T oil temperature 200
C
• Lock-up control inhibit
• Up hill and down hill control inhibit
• Blinks "CHECK TRANS" lamp
• Stores the failure information in failure-memoryAt failure decision
Same as failure detection.
Conditions of turning "CHECK TRANS" off:
Turns "CHECK TRANS" lamp off when judged 0km/h by
output revolution sensor after the normal area of oil
temperature 40
C – 150C is detected for 10 sec
continuously.
Reversion conditions from fail-safe:
Recovers at the same time as the conditions of turning
“CHECK TRANS” lamp off are satisfied.
Test description:
The following numbers correspond to circled numbers on
the diagnostic char t.
(1) Check that the voltage of the oil temperature sensor
varies with ATF temperatures.
(2) Check that the resistance of the oil temperature
sensor varies with ATF temperatures.
Diagnostic aids:
An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside
the insulation. Inspect related harness connector for
backed out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal
to wire connection and damaged harness.

7A–34 AUTOMATIC TRANSMISSION (AW30-40LE)
DTC P0717 (FLASHING CODE 14) INPUT REVOLUTION SENSOR FAILURE (NC0)
D07RY00020
Circuit description:
Input revolution information is provided to TCM by the
input revolution sensor. This sensor is located in the
transmission case.
The input revolution sensor is an electromagnetic pulse
pickup type that generates a speed signal according to
the revolution of the transmission OD direct clutch drum.
As a result, the sensor sends a sine wave signal (AC) to
the TCM, which conver ts this sine wave signal (pulse
voltage) to a RPM signal.
Fail-safe control:
The TCM controls fail-safe by detecting input revolution
sensor failure.
Failure detection:
• When not even 1 pulse is input in the input revolution
sensor during the time 4 pulses are input in the
output revolution sensor.
• When the failure criteria is continuously 1000 times
from the time ignition is turned ON until it is turned
OFF.
Prohibits failure detection when at least one among the
following conditions is satisfied.
• When D, 2 and L range signal is not fixed.
• When output revolution is less than 775 rpm.
• When the failure detection timer T1 (*1) is less than
25 seconds.
• Solenoid S1, S2, and selector position switch is on
failure detection or decision.
• At 4th gear.
• When passed less than 10 seconds after shift
command output.
*1: Failure detection inhibit timer T1
Timer star ts when D, 2 or L range are detected (fixation
signal).
Contents of control:
At failure detection• Lock-up control inhibit
• Up hill and down hill control inhibit
At failure decision
Executes following items in addition to above control
items at failure detection.
• Blinks "CHECK TRANS" lamp
• Stores the failure information in failure-memory
Conditions of turning "CHECK TRANS" off:
At D, 2 or L range and not shifting, turns "CHECK
TRANS" lamp off when judged 0km/h by output
revolution sensor after more than 1 pulse input in the
input revolution sensor and finished vehicle speed
calculation during the time 4 pulse are input in the output
revolution sensor.
Reversion conditions from fail-safe:
Recovers at the same time as the conditions of turning
“CHECK TRANS” lamp off are satisfied.
Test description:
The following numbers correspond to circled numbers on
the diagnostic char t.
(1) When the engine is running, a revolution signal is
input from the input revolution sensor to the TCM.
(2) At this test, the continuity of circuit wiring and the
input revolution sensor is checked.
(3) At this test, the continuity of the input revolution
sensor is checked.
Diagnostic aids:
An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside
the insulation. Inspect related harness connector for
backed out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal
to wire connection and damaged harness.

7A–36 AUTOMATIC TRANSMISSION (AW30-40LE)
DTC P0722 (FLASHING CODE 11) OUTPUT REVOLUTION SENSOR FAILURE (SP2)
D07RY00018Circuit description:
Vehicle speed information is provided to the TCM by the
output revolution sensor. This sensor is located in the
transmission adapter housing. The output revolution
sensor is an electromagnetic pulse pickup type that
generates a speed signal according to the revolution of
the transmission output shaft. As a result, the sensor
sends a sine wave signal (AC) to the TCM, which
converts this sine wave signal (pulse voltage) to a km/h
signal.
Fail-safe control:
The TCM controls fail-safe by detecting output revolution
sensor failure.
Failure detection:
• When not even 1 pulse is input in the output
revolution sensor during the time 4 pulses are input
in the speed meter sensor.
• When the failure criteria is continuously 500 times
from the time ignition is turned ON until it is turned
OFF.
• Detection inhibit condition:
When speed meter sensor revolution is less than 80
rpm.
Contents of control:
At failure detection
• Uses the vehicle speed calculated by speed meter
sensor for shift control
• Keeps the condition of transfer (High/Low judgment)
just before detection until vehicle speed is 0km/h,
and changes shift map to L4 map (3
4UP None) at
vehicle speed 0km/h.
• Use high oil temperature map according to shift map
priority at correct oil temperature control.
• Squat control inhibit
• Up hill and down hill control inhibit
• Reverse lockout control inhibit• Stores the failure information in failure-memory
At failure decision
Executes following items in addition to above control
items at failure detection.
•Blinks "CHECK TRANS" lamp
Conditions of turning "CHECK TRANS" off:
Turns "CHECK TRANS" lamp off when judged 0km/h by
speed meter sensor after more than 1 pulse input in the
output revolution sensor and finished vehicle speed
calculation during the time 4 pulse are input in the speed
meter sensor.
Reversion conditions from fail-safe:
Recovers at the same time as the conditions of turning
“CHECK TRANS” lamp off are satisfied.
Test description:
The following numbers correspond to circled numbers on
the diagnostic char t.
(1) When the vehicle is running, a speed signal is input
from the output revolution sensor to the TCM.
(2) At this test, the continuity of circuit wiring and the
output revolution sensor is checked.
(3) At this test, the continuity of the output revolution
sensor is checked.
Diagnostic aids:
An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside
the insulation. Inspect related harness connector for
backed out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal
to wire connection and damaged harness.

7A–38 AUTOMATIC TRANSMISSION (AW30-40LE)
DTC P0727 (FLASHING CODE 13) ENGINE REVOLUTION SIGNAL FAILURE (NE)
D07RY00019Circuit description:
Engine revolution (rpm) signals are sent from Engine
Control Module (ECM) to the Transmission Control
Module (TCM).
The engine speed sensor is an electromagnetic pulse
pickup type that generates signals when the flywheel
gear revolves (2 pulses at a single revolution of the
flywheel gear).
The TCM converts these sine wave signals into engine
revolution (RPM) signals.
Fail-safe control:
The TCM controls fail-safe by detecting engine revolution
sensor failure.
Failure detection:
• When input revolution is more than 2000 rpm
• When not even 1 pulse is input in the engine
revolution signal during 5 seconds
• Detection inhibit condition: At 4th gear
Contents of control:
At failure detection
• Up hill and down hill control inhibit
• Oil temperature sensor failure detection inhibit
• Blinks "CHECK TRANS" lamp
• Stores the failure information in failure memory.
At failure decision
Same as failure detection
Conditions of turning "CHECK TRANS" lamp off:
Turns "CHECK TRANS" lamp off when judged 0km/h by
speed meter sensor after the engine revolution signal
pulses are input 250 pulses normally.
(however, uses 0 km/h judgment by back-up vehicle
speed at output revolution failure)
Reversion conditions from fail-safe:
Recovers at the same time as the conditions of turning
“CHECK TRANS” lamp off are satisfied.Test description:
The following numbers correspond to circled numbers on
the diagnostic char t.
(1) Engine revolution signals are input from the ECM into
the TCM.
(2) When the engine idling, voltage fluctuates with (AC
intermittent) range of less than 1.4V
9 16V.
Diagnostic aids:
An intermittent may be caused by a poor connection,
rubbed through wire insulation or a wire broken inside
the insulation. Inspect related harness connector for
backed out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal
to wire connection and damaged harness.