1998 OPEL FRONTERA low oil pressure

7A–18
AUTOMATIC TRANSMISSION (4L30–E)
Chart 9c: Coastdown Harsh Shift Or Clunk At 3–2 Downshift
StepActionYe sNo
1Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section
2Does DTC P1850 set?
Diagnose P1850
first
Replace band
apply solenoid
(PWM) (323)
Chart 10: Intermittent 4TH TO 2ND Gear Downshift At Steady Speed
StepActionYe sNo
1Check for consistent speed sensor reading with scan tool.
Was the reading correct?Replace mode
switch for
intermittent
contact.
Go to Step 2
21. Check for wiring harness damage or short to ground. If OK, go
to (2).
2. Check transmission speed sensor connections. If OK, go to
(3).
3. Replace transmission speed sensor.
Was the replacement complete?
—
Replace speed
sensor.
Chart 11: Engine Flare At Shifting During Turning Only (Usually With Warm Engine)
StepActionYe sNo
1Check for oil leaks at transmission.
Was the problem found?Replace
transmission oil
filter and gasket
—
Chart 12: Engine Flare During 1–2 Or 2–3 Shift
StepActionYe sNo
1Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section
21. Check for a stuck 1–2 accumulator valve (320).
2. Check for servo piston (106) leaks.
3. Check for a stuck band apply solenoid (323).
Was line pressure normal?
Repair or replace—

7A–20
AUTOMATIC TRANSMISSION (4L30–E)
Chart 15a: Possible Causes of Low Line Pressure
StepActionYe sNo
1Check oil level.
Was the problem found?
Fill with ATFGo to Step 2
2Check for defective throttle position sensor.
Was the problem found?Replace throttle
position sensor
Go to Step 3
3Check for plugged, loose, or damaged oil filter (79).
Was the problem found?Inspect oil filter,
tighten bolts or
replace oil filter
(79)
Go to Step 4
4Check for a stuck force motor plunger (404). (Adapter case valve
body)
Was the problem found?Replace force
motor plunger
(404)
Go to Step 5
5Check for a stuck feed limit valve (412). (Adapter case valve body)
Was the problem found?Replace feed limit
valve (412)
Go to Step 6
6Check for loose converter bolts (4 & 5).
Was the problem found?Tighten converter
bolts (4 & 5)
Go to Step 7
7Check for a stuck pressure regulator valve (208). (Oil pump)
Was the problem found?Replace pressure
regulator valve
(208)
Go to Step 8
8Check for a stuck boost valve (205).(Oil pump)
Was the problem found?Replace boost
valve (205)
Go to Step 9
9Check for blocked intermediate oil passages to pressure
regulator valve. (Oil pump)
Was the problem found?
Replace oil pumpGo to Step 10
10Check for defective oil pump (9, 201, 202 & 209).
Was the problem found?
Replace oil pumpGo to Step 11
11Check for internal leaks.
– Check balls missing or out of location in valve bodies
– Seals cut or damaged
– Gaskets defective, etc.
Was the problem found?Install balls, or
correct ball
location
Replace seals
Replace gaskets
—

7A–22
AUTOMATIC TRANSMISSION (4L30–E)
Chart 16: Possible Causes Of
Transmission Fluid Leaks
Before attempting to correct an oil leak, the actual source
of the leak must be determined. In many cases, the
source of the leak may be difficult to determine due to
“wind flow” around the engine and transmission.
The suspected area should be wiped clean before in-
specting for the source of the leak.Oil leaks around the engine and transmission are gener-
ally carried toward the rear of the vehicle by the air
stream. In determining the source of an leak, the following
two checks should be made:
1. With the engine running, check for external line
pressure leaks.
2. With the engine off, check for oil leaks due to the
raised oil level caused by drainback of converter oil
into the transmission.
Possible Causes Of Fluid Leaks Due To Sealing Malfunction
240RX008
Legend
(1) Electrical Connector (Main Case) Seal
(2) Transmission Vent (Breather)
(3) Speed Sensor O–Ring
(4) Extension (Adapter) Lip Seal
(5) Extension (Adapter) to Main Case Gasket
(6) Overfill and Oil Drain Screws Gasket
(7) Oil Pan Gasket (Main Case)
(8) Selector Shaft Seal(9) Oil Cooler Connectors (2)
(10) Oil Pan Gasket (Adapter Case)
(11) Converter housing attaching bolts not correctly
torqued
(12) Converter Housing Lip Seal
(13) Line Pressure Tap Plug
(14) Electrical Connector (Adapter Case) Seal
(15) Adapter Case Seal Rings (2)

7A–23 AUTOMATIC TRANSMISSION (4L30–E)
Stall Test
The stall test allows you to check the transmission for
internal abrasion and the one way clutch for slippage.
Torque converter performance can also be evaluated.
The stall test results together with the road test results will
identify transmission components requiring servicing or
adjustment.
Stall Test Procedure:
1. Check the level of the engine coolant, the engine oil,
and the automatic transmission fluid. Replenish if
necessary.
2. Block the wheels and set the parking brake.
3. Connect a tachometer to the engine.
4. Start the engine and allow it to idle until the engine
coolant temperature reaches 70 – 80
C (158 –
176
F).
5. Hold the brake pedal down as far as it will go.
6. Place the selector in the “D” range.
7. Gradually push the accelerator pedal to the floor.
The throttle valve will be fully open.
Note the engine speed at which the tachometer
needle stabilizes.
Stall Speed : 2,100
150 rpm
NOTE: Do not continuously run this test longer than 5
seconds.
8. Release the accelerator pedal.
9. Place the selector in the “N” range.
10. Run the engine at 1,200 rpm for one minute.
This will cool the transmission fluid.
11. Repeat Steps 7 – 10 for the “3”, “2”, “L” and “R”
ranges.
Line Pressure Test
The line pressure test checks oil pump and control valve
pressure regulator valve function. It will also detect oil
leakage.
Line Pressure Test Procedure:
1. Check the level of the engine coolant, the engine oil,
and the automatic transmission fluid.
Replenish if required.
2. Block the wheels and set the parking brake.
3. Remove the pressure detection plug at the left side of
the transmission case.
Set 5–8840–0004–0 pressure gauge and adapter to
the pressure detection plug hole.
241RS001
4. Start the engine and allow it to idle until the engine
coolant temperature reaches 70 – 80
C (158 –
176
F).
5. Hold the brake pedal down as far as it will go.
6. Place the selector in the “D” range.
7. Note the pressure gauge reading with the engine
idling.
8. Gradually push the accelerator pedal to the floor. The
throttle valve will be fully open.
Note the pressure gauge reading with the accelerator
pedal fully depressed.
NOTE: Do not continuously run this test longer than 5
seconds.
9. Release the accelerator pedal.
10. Place the selector in the “N” range.
11. Run the engine at 1,200 rpm for one minute.
This will cool the transmission fluid.
12. Repeat Steps 7 – 11 for the “3”, “2”, “L”, and “R”
ranges.
13. Install a pressure detection plug to the transmission
case, applying recommended thread locking agent
(LOCTITE 242) or its equivalent to thread of plug.
Make sure that thread is cleaned before applying
locking agents.
14. Tighten the pressure detection plug to the specified
torque.
Torque:9–14Nꞏm(0.9–1.4kgꞏm/7–10lbft)

7A–63 AUTOMATIC TRANSMISSION (4L30–E)
10. Remove retainer (13), 2–3 shift valve (14), and spring
(15).
11. Remove spring pin (16), plug (17), spring (18), and
low pressure control valve (19).
12. Remove spring pin (20), plug (21), and band control
screen assembly (22).
13. Remove spring pin (23), plug (24), 1–2 accumulator
valve (25), and 1–2 accumulator control valve (26).
14. Remove check ball (27) from valve body (28).
Inspection And Repair
Inspect for the following, and replace any damaged or
worn parts:
1. Damage or wear to each valve.
2. Damage in oil passeges.
3. Cracks or damage to valve body.
4. Valve operations.
5. Spring fatigue.
Reassembly
1. Install 1–2 accumulator control valve (26), 1–2
accumulator valve (25), plug (24), and spring pin (23).
2. Install band control screen assembly (22), plug (21),
and spring pin (20).
3. Install low pressure control valve (19), spring (18),
plug (17), and spring pin (16).
4. Install spring (15), 2–3 shift valve (14), retainer (13),
solenoid B (12), and spring pin (11).
5. Install spring (10), 1–2/3–4 shift valve (9), retainer (8),
solenoid A (7), and spring pin (6).
6. Install waved washer (5), band control solenoid (3),
and pin (4).
7. Install manual valve (2).
8. Install check ball (27) to valve body (28).9. Install gasket (valve body/transfer plate) and transfer
plate using two 5–8840–2270–0 (J–3387–2) guide
pins.
Install two 11mm bolts.
To r q u e : 1 3 N
m (1.3 kgꞏm/113 lb in)
244RW004
Install gasket (transfer plate/main case).

AUTOMATIC TRANSMISSION (AW30-40LE) 7A–7
CONTROL AND FUNCTIONS
Item Description
Shift and lock-up control • In D range, speed change point and Lock-up point can be changed by
setting pattern selection switch to "POWER", "NORMAL" or "WINTER"
mode.
• Gear shift position in the conditions made up of transmission shift positions
(D.2.L) combined with pattern selection switch (POWER, NORMAL, and
WINTER) can be controlled in accordance with vehicle speed and the
opening of throttle valve.
Overdrive cut control • If O/D OFF switch is set on in D range (O/D OFF lamp ON), gear shift to O/
D is not effected.
• Overdrive is released at O/D OFF switch on and high transmission oil
temperature (More than 130
C).
However, to prevent engine over revolution
•4
3 shifting at vehicle speed is less than 118 km/h.
•3
4 shifting at vehicle speed is more than 131 km/h.
Lock-up cut control • In D range, 3rd or O/D lock-up is conducted in "POWER" or "NORMAL"
mode.
• In 2, L range, lock-up is off in the whole area.
• Lock-up timing is controlled to reduce gear shift shock using kind of gear
shift (shift up, etc.) lock-up status at the time of gear shift judgement, gear
step and throttle opening after gear shift.
• Lock-up is released at brake on or high transmission oil temperature (More
than 130
C).
• Lock-up is prohibited when idling is defected by throttle position sensor.
Driving mode select control • The TCM selects a suitable driving mode from the nine kinds for the variety
driving condition.
i) Economy mode ii) Power mode iii) Winter mode iv) HOT1 mode v) HOT2
mode vi) L4 mode vii) Slope mode (Up slope 1, Up slope 2 and Down
slope mode)
• The priority of driving mode:
Economy < Power < Slope < L4 < Winter < HOT1 < HOT2
Squat control • When the TCM detects D signal on, the TCM controls 1–3–1 shift by
setting a timer, in order to improve the shift feel at N
D.
Line pressure control • The TCM output current which corresponds to throttle oil pressure to
pressure control solenoid based on throttle opening.
Indicate oil temperature warning
function• If the transmission oil temperature sensor senses that transmission oil
temperature is greater than 146
C, the TCM turn on A/T OIL TEMP
warning lamp. (The warning lamp is turned off, if oil temperature is less
than 126
C.)
L4 mode control • The TCM judges whether the transfer is engaged in high or low based on
the ratio rpm data from output speed sensor in the transmission and the
rpm data from speed meter sensor to select the shift map.
Up and down hill control • The TCM judges up and down hill, and change shift pattern based on
throttle opening and acceleration.
Correct oil temperature control • If the temperature exceeds a predetermined value, the TCM selects the
high oil temperature shift point for downshifting, thus preventing the oil
temperature from rising. (More than 130
C, D range)

AUTOMATIC TRANSMISSION (AW30-40LE) 7A–13
DIAGNOSIS
BASIC TROUBLESHOOTING
AW30-40LE transmission, called Electronic Controlled Transmission (ECT), differs from oil pressure control type
transmissions in that it is controlled by a microcomputer. Accordingly, its troubleshooting procedure differs also.
Before troubleshooting an ECT, first determine whether the problem is electrical or mechanical. To do this, just refer to
the basic troubleshooting flowchart provided below. If the cause is already known, using the basic troubleshooting
chart below along with the general troubleshooting char t on the following page should speed the procedure.

7A–20 AUTOMATIC TRANSMISSION (AW30-40LE)
Once the test vehicle has been identified an “Application
(Power train) Menu" screen appears. Please select the
appropriate application.
The following table shows, which functions are used for
the available equipment versions.
Diagnostic Trouble Codes
The purpose of the “Diagnostic Trouble Codes" mode is
to display stored TCM trouble codes.
When “Diagnostic Trouble Codes" is selected an
“Application Menu" screen appears.
Clear DTC Information
The purpose of the “Clear DTC Information" mode is to
command the clearing of stored TCM trouble codes.
When “Clear DTC Information" is selected, a “Clear
DTC Information", warning screen appears. This screen
informs you that by cleaning DTC's, “all stored DTC
information in controller will be erased".
Do you want to clear DTC's (Yes/No).
Press either the Yes or No key when answering.
After clearing codes, confirm system operation by test
driving the vehicle.
Allow the vehicle to shift through all four forward gears in
a manner which attempts to repeat the failure condition.
NOTE: When the trouble has not been repaired and thetrouble code cannot be erased, check the vehicle again.
DTC Information
When “DTC Information" is selected, an “Application
Menu" appears with a list of DTC information function
keys addressing DTC specifics and their origins.
Function key selections may vary for particular vehicle
and/or system.
Data Display
The purpose of the “Data Display" mode is to
continuously monitor data parameters.
The current actual values of all impor tant sensors and
signals in the system are display through F1 mode.
When “Data Display" is selected an “Application Menu"
appears.
See “TRANSMISSION DATA" and “TCC DATA” on next
page.
Snapshot
When “Snapshot" is selected an “Application Menu"
appears.
When “Transmission Snapshot" application is selected
from the “Application Menu", a “Snapshot Menu"
appears, displaying several options. “Snapshot" options
may vary from one system to another.
“Snapshot" allows a recording of all vehicle parameters.
There parameters may then be replayed at a future
point in time.
This action allows you to focus on making the condition
occur, rather than trying to view all of the data in
anticipation of the fault. The snapshot will collect
parameter information around a trigger point that you
select.
When a snapshot is taken. It is recorded onto the
PCMCIA memory card. When the Tech2 is powered
down. Snapshots are not lost.
Actuator Tests
The purpose of “Actuator Tests" mode is to check for
correct operation of electronic system actuators.
Lamps
You can operate the lamps by pressing the ON and OFF
buttons.
Preconditions: P or N position
Solenoid
Solenoid S1(1-2/3-4), S2(2-3) and TCC Solenoid
(Torque Converter Clutch)
You can operate the solenoids by pressing the ON and
OFF buttons.
Preconditions: P or N position, no vehicle speed, no
engine speed
Pressure Control Solenoid (PCS)
You can operate the PC Solenoid by pressing the ON
and OFF buttons. ON will command a maximum current
of 1000 mA and OFF a minimum of 200 mA.
Preconditions: P or N position, no vehicle speed, engine
running F0: Diagnostic Trouble Codes
F0: Read DTC Info Ordered By Priority
F1: Clear DTC Information
F2: DTC Information
F0: History
F1: MIL SVS or Message Requested
F2: Last Test Failed
F3: Test Failed Since Code Cleared
F4: Not Ran Since Code Cleared
F5: Failed This Ignition
F1: Data Display
F0: Transmission Data
F1: TCC Data
F2: Snapshot
F3: Actuator Tests
F0: Lamps
F0: Check Light Test
F1: Power Lamp Test
F2: Winter Lamp Test
F3: AT Oil Temperature Lamp Test
F1: Solenoids
F0: Solenoid 2-3 Test
F1: Solenoid 1-2/3-4 Test
F2: TCC Solenoid Test
F3: Pressure Control Solenoid (PCS)