air condition OPEL FRONTERA 1998 Workshop Manual

6E–217 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Throttle Body (TB)
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the cover of the intercooler.
035RW051
3. Remove the bolts and the left side bracket to the
intercooler.
4 . R e m o v e t h e a i r d u c t w i t h b r a c k e t f r o m t h e i n t e r c o o l e r.
035RW086
5. Remove the throttle body assembly from the intake
manifold.
6. Disconnect the ITP sensor electrical connector.
Installation Procedure
NOTE: Do not use solvent of any type when you clean the
gasket surfaces on the intake manifold and the throttle
body assembly. The gasket surfaces and the throttle body
assembly may be damaged as a result.
If the throttle body gasket needs to be replaced,
remove any gasket material that may be stuck to the
mating surfaces of the manifold.
Do not leave any scratches in the aluminum casting.
1. Install the throttle body assembly to the intake
manifold and the air duct with bracket between
throttle body and intercooler.
Torque: 20 Nꞏm (14 Ib ft)
035RW086
2. Connect the ITP sensor electrical connector and
throttle motor control connector.
3. Install the bracket to the intercooler.
4. Install the cover of intercooler.
5. Connect the negative battery cable.
Air Conditioning (A/C) Relay
Removal Procedure
1. Remove the fuse and relay box cover from under the
hood.
2. Consult the diagram on the cover to determine which
is the correct relay.
3. Pull the relay straight up and out of the fuse and relay
box.
Installation Procedure
1. Insert the relay into the correct place in the fuse and
relay box with the catch slot facing forward.
2. Press down until the catch engages.
An audible “click” will be heard.
3. Install the fuse and relay box cover.
Exhaust Gas Recirculation
(EGR) Vacuum Switch Valve
(VSV)
Removal Procedure
1. Disconnect the negative battery cable.

6E–226
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
0018
Manifold Absolute Pressure (MAP) Sensor
The manifold absolute pressure (MAP) sensor responds
to changes in intake manifold pressure. The MAP sensor
signal voltage to the ECM varies from below 2 volts at idle
(high vacuum) to above 4 volts.
The MAP sensor is used to determine the following:
Boost pressure for injector control.
Barometric pressure (BARO).
If the ECM detects a voltage that is lower than the
possible range of the MAP sensor, DTC P0107 will be set.
A signal voltage higher than the possible range of the
sensor will set DTC P0108. An intermittent low or high
voltage will set DTC P1107 or DTC P1106, respectively.
The ECM can detect a shifted MAP sensor. The ECM
compares the MAP sensor signal to a calculated MAP
based on throttle position and various engine load factors.
If the ECM detects a MAP signal that varies excessively
above or below the calculated value, DTC P0106 will set.
Engine Control Module (ECM)
The engine control module (ECM) is located in the engine
room.
The ECM constantly observes the information from
various sensors. The ECM controls the systems that
affect vehicle performance. The ECM performs the
diagnostic function of the system. It can recognize
operational problems, alert the driver through the MIL
(Service Engine Soon lamp), and store diagnostic trouble
codes (DTCs). DTCs identify the problem areas to aid the
technician in making repairs.
ECM Function
The ECM supplies 5, 12 and 110 volts to power various
sensors or switches. The power is supplied through
resistances in the ECM which are so high in value that a
test light will not light when connected to the circuit. In
some cases, even an ordinary shop voltmeter will not give
an accurate reading because its resistance is too low.
Therefore, a digital voltmeter with at least 10 megohms
input impedance is required to ensure accurate voltage
readings. The ECM controls output circuits such as theinjectors, glow relays, etc., by controlling the ground or
the power feed circuit through transistors or through
either of the following two devices:
Output Driver Module (ODM)
Quad Driver Module (QDM)
ECM Components
The ECM is designed to maintain exhaust emission levels
to government mandated standards while providing
excellent driveability and fuel efficiency. The ECM
monitors numerous engine and vehicle functions via
electronic sensors such as the crankshaft position (CKP)
sensor, and vehicle speed sensor (VSS). The ECM also
controls certain engine operations through the following:
Fuel injector control
Rail pressure control
ECM Voltage Description
The ECM supplies a buffered voltage to various switches
and sensors. It can do this because resistance in the
ECM is so high in value that a test light may not illuminate
when connected to the circuit. An ordinary shop
voltmeter may not give an accurate reading because the
voltmeter input impedance is too low. Use a 10-megohm
input impedance digital voltmeter to assure accurate
voltage readings.
The input/output devices in the ECM include
analog-to-digital converters, signal buffers, counters,
and special drivers. The ECM controls most components
with electronic switches which complete a ground circuit
when turned “ON.” These switches are arranged in
groups of 4 and 7, called either a surface-mounted quad
driver module (QDM), which can independently control up
to 4 output terminals, or QDMs which can independently
control up to 7 outputs. Not all outputs are always used.
ECM Input/Outputs
Inputs – Operating Conditions Read
Air Conditioning “ON” or “OFF”
Engine Coolant Temperature
Crankshaft Position
Electronic Ignition
Manifold Absolute Pressure
Battery Voltage
Intake Throttle Position
Vehicle Speed
Fuel Temperature
Oil Temperature
Intake Air Temperature
EGR boost pressure
Oil rail pressure
Camshaft Position
Accelerator position
Outputs – Systems Controlled
Exhaust Gas Recirculation (EGR)
Injector Control
QWS

6E–228
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
General Description (Air Induction)
Air Induction System
The air induction system filters contaminants from the
outside air, and directs the progress of the air as it is
drawn into the engine. A remote-mounted air cleaner
prevents dirt and debris in the air from entering the
engine. The air duct assembly routes filtered air to the
throttle body. Air enters the engine by to following steps:
1. Through the throttle body.
2. Into the intake manifold.
3. Through the cylinder head intake ports.
4. Into the cylinders.
General Description (Fuel Metering)
Deceleration Mode
The ECM reduces the amount of fuel injected when it
detects a decrease in the Accelerator position.
Fuel Injector
Fuel injector comprises the solenoid, hydraulic line, and
fuel line. Fuel injection is controlled by the continuity time
signal and continuity start timing signal from ECM to the
solenoid
ECM determines the running conditions of engine by
input signals such as engine speed. Accelerator throttle
valve opening, and engine coolant temperature, thereby
to send the solenoid the best suited signal to the engine
status. When current is carried to the solenoid, the
armature opens the poppet valve to alow high pressure oil
to run into the injector. Under the pressure of the oil, the
piston and plunger are depressed to compress the fuel in
the combustion chamber of the plunger. Specifically, the
pressure of the fuel compressed is increased by a piston
top/ plunger bottom area ratio over the pressure of high
pressure oil, thereby lifting the fuel nozzle end needle for
injecting fuel.
Fuel Metering System Components
The fuel metering system is made up of the following
parts:
The fuel injectors.
The intake throttle body.
The Accelerator position (AP) sensor
The ECM.
The crankshaft position (CKP) sensor.
The camshaft position (CMP) sensor.
Basic System Operation
Fuel is supplied through fuel filter to the fuel pump.
The fuel pump is installed to the oil pump, and fuel is
forced, through the fuel pump outlet, pipe and cylinder
head inside, into the fuel injector.
An orifice is provided at the rear fuel outlet of cylinder
head to control the pressure of oil.The injector is controlled by ECM which gives
opening/closing commands to the solenoid installed on
the top of the injector. Opening/closing operation of the
pressurized engine oil circuit of the injector controls fuel
injection quantity, fuel injection timing, etc.
A/C Clutch Diagnosis
A/C Request Signal
This signal tells the ECM when the A/C mode is selected
at the A/C control head. The ECM uses this to adjust the
idle speed.
Refer to
A/C Clutch Circuit Diagnosis for A/C wiring
diagrams and diagnosis for A/C electrical system.
General Description Exhaust Gas
Recirculation (EGR) System
EGR Purpose
The exhaust gas recirculation (EGR) system is use to
reduce emission levels of oxides of nitrogen (NOx). NOx
emission levels are caused by a high combustion
temperature. The EGR system lowers the NOx emission
levels by decreasing the combustion temperature.
The ECM uses information from the following sensors to
control EGR valve boost pressure.
ECT
ITP
Engine Speed
AP sensor

ENGINE SPEED CONTROL 6H – 3
REMOVAL
1. Remove harness connector from accel position
(AP) sensor.
2. Remove accelerator pedal assembly from chassis.
INSPECTION AND REPAIR
1. Check moving condition of accelerator pedal, if not
smooth working, apply oil to the pivot etc.
2. Check tightening condition of accel position (AP)
sensor, if not completely tightened, it should be
tightened additionally.
INSTALLATION
1. Install accelerator pedal assembly to chassis.
2. Connect harness connector to accel position (AP)
sensor.
ACCELERATOR PEDAL

7A–1 AUTOMATIC TRANSMISSION (4L30–E)
TRANSMISSION
AUTOMATIC TRANSMISSION (4L30–E)
CONTENTS
Service Precaution 7A–3. . . . . . . . . . . . . . . . . . . . . .
Construction 7A–3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Range Reference Chart 7A–4. . . . . . . . . . . . . . . . . .
Normal Operation Of 1998 4L30–E
Transmission 7A–5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosis 7A–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Information 7A–5. . . . . . . . . . . . . . . . . . . . . . .
General Diagnosis Procedure 7A–8. . . . . . . . . . . . .
Preliminary Inspection Chart 7A–9. . . . . . . . . . . . . .
Checking Transmission Fluid Level and
Condition 7A–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Driving 7A–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical / Hydraulic Diagnosis Check Trans
Indicator Chart 7A–12. . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical / Hydraulic Diagnosis Symptoms
Index 7A–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stall Test 7A–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Pressure Test 7A–23. . . . . . . . . . . . . . . . . . . . . .
Shift Speed Chart 7A–24. . . . . . . . . . . . . . . . . . . . . . .
Lockup Speed Chart 7A–26. . . . . . . . . . . . . . . . . . . . .
Changing Transmission Fluid 7A–27. . . . . . . . . . . . .
Selector Lever 7A–27. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection 7A–27. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–28. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mode Switch 7A–29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission (With Transfer Case) 7A–31. . . . . . . .
Transmission And Associated Parts 7A–31. . . . . .
Removal 7A–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–33. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Main Case Valve Body) 7A–36. . . . . . . . .
Removal 7A–36. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–36. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Adapter Case Valve Body) 7A–37. . . . . . .
Removal 7A–37. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–37. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Main Case) 7A–38. . . . . . . .
Removal 7A–38. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–38. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Adapter Case) 7A–40. . . . . .
Removal 7A–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–40. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powertrain Control Module (PCM) 7A–40. . . . . . . . . Removal 7A–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–40. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speed Sensor (Extension Housing) 7A–41. . . . . . . .
Removal 7A–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–41. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Oil Temperature Sensor
(Adapter Case) 7A–41. . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–42. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Oil Seal (Converter Housing) 7A–42. . . . . . . .
Removal 7A–42. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–42. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Oil Seal (Extension Housing) 7A–43. . . . . . . . .
Removal 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission (4L30–E) 7A–43. . . . . . . . . . . . . . . . . .
Disassembly 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . .
Reassembly 7A–47. . . . . . . . . . . . . . . . . . . . . . . . . .
Converter Housing And Oil Pump Assembly 7A–57
Disassembled View 7A–57. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–57. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–57. . . . . . . . . . . . . . . . . .
Reassembly 7A–57. . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pump 7A–58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A–58. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–58. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–58. . . . . . . . . . . . . . . . . .
Reassembly 7A–58. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Case Valve Body 7A–59. . . . . . . . . . . . . . . . . . .
Disassembled View 7A–59. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–59. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–60. . . . . . . . . . . . . . . . . .
Reassembly 7A–60. . . . . . . . . . . . . . . . . . . . . . . . . .
Adapter Case Valve Body 7A–61. . . . . . . . . . . . . . . .
Disassembled View 7A–61. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–61. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–61. . . . . . . . . . . . . . . . . .
Reassembly 7A–61. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch And Sprag Unit 7A–63. . . . . . . . . . . . . .
Disassembled View 7A–63. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–63. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–64. . . . . . . . . . . . . . . . . .
Reassembly 7A–64. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch 7A–65. . . . . . . . . . . . . . . . . . . . . . . . . . . .

7A–10
AUTOMATIC TRANSMISSION (4L30–E)
Checking Transmission Fluid Level
and Condition
Checking fluid level and condition (color and odor) at
regular intervals will provide early diagnosis information
about the transmission. This information may be used to
correct a condition that, if not detected early, could result
in major transmission repairs.
IMPORTANT:When new, automatic transmission fluid
is red in color. As the vehicle is driven, the transmission
fluid will begin to look darker in color. The color may
eventually appear light brown.
A dark brown color with burnt odor may indicate
excessive fluid deterioration and signal a need for fluid
change.
Fluid Level
When adding or changing fluid, use only DEXRON –III.
Refer to Maintenance and Lubrication in General
Information section for maintenance information and
servicing interval.
CAUTION: DO NOT OVERFILL.
Overfilling will cause foaming, loss of fluid, abnor-
mal shifting and possible damage to the transmis-
sion.
1. Park the vehicle on level ground and apply the parking
brake firmly.
2. Check fluid level with engine running at idle.
NOTE: Be sure that transmission fluid temperature is
below 30
C (86F).
3. Move the selector lever through all gear ranges.
4. Move the selector lever to “Park”.
5. Let engine idle for 3 minutes and open the overfill
screw (1).
6. Add released transmission fluid until it flows out over
the overfill screw opening.
7. Let engine idle until a fluid temperature between 32
C
(90
F) and 57C (135F) is reached, then close the
overfill screw (1).
Torque: 38 N
m (3.9 kgꞏm/28 lb ft)
NOTE: To prevent fluid leaks, the overfill screw and oil
drain screws gasket must be replaced each time these
screws are removed.NOTE: Check transmission fluid temperature with scan
tool.
Minimum fluid level
57C (135F)
Maximum fluid level
32C (90F)
242RW003
CAUTION: Do not open overfill screw with engine
stopped.
CAUTION: DO NOT CHECK FLUID LEVEL UNDER
THESE CONDITIONS:
Immediately after driving at sustained highway
speeds.
In heavy city traffic during hot weather.
If vehicle is towing a trailer.
If the vehicle has been operated under these conditions,
shut the engine off and allow the vehicle to “cool” for thirty
(30) minutes. After the cool down period, restart the
vehicle and continue from step 2 above.

7A–11 AUTOMATIC TRANSMISSION (4L30–E)
Fluid Condition
FLUID CONDITION
NORMAL*CONTAMINATED
COLORRED OR LIGHT
BROWNBROWNNON–TRANSPAR-
ENT / PINKBROWN
DRAIN RE-
QUIRED?NOYESYESYES
CONTAMINA–
TIONNONEVery small amount of
foreign material in bot-
tom of panContamination by cool-
ant or other sourceLarge pieces of metal
or other foreign materi-
al in bottom of pan
CORRECT
LEVEL AND
CONDITION
1. LOW LEVEL:
A. Add fluid to
obtain proper
level & check for
external leaks.
B. Correct cause of
leak.
2. HIGH LEVEL:
– Remove excess
fluid– Remove both pans
– Change filter
– Flush cooler
– Add new fluid
– Check level– Repair/replace
radiator cooler
–Transmission
overhaul required
– Check for:
Damaged plates
and seals
Contaminated
solenoids
– Flush cooler
– Add new fluid
– Check level
–Transmission
overhaul required
– Flush cooler and
cooler lines
– Add new fluid
– Check level
*Fluid should be changed according to maintenance
schedule.
Te s t D r i v i n g
Some 4L30–E automatic transmission complaint will
require a test drive as a part of the diagnostic procedure.
Some codes will not set unless the vehicle is moving. The
purpose of the test drive is to duplicate the customer’s
complaint condition and set a current Powertrain Control
Module (PCM) trouble code. Perform this procedure
before each 4L30–E automatic transmission repair, and
again after repairs are made.
IMPORTANT:
Duplicate the condition under which the customer’s
complaint was observed.
Depending on the complaint, the line pressure gauge
and the scan tool may be required during the test
drive.
During the test drive, it is important to record all
necessary data from the areas being monitored, for
use in diagnosis. Also listen for and note any unusual
noises.
The following procedure should be used to test drive
4L30–E automatic transmission complaint vehicles:
1. Turn the ignition ON without starting the engine.
Check that the “CHECK TRANS” lamp comes on for
approximately 2 to 3 seconds and then goes out and
remains out.
If the lamp is flashing, GOTO Check Trans Indicator
in Transmission Control System (4L30–E) section.
If no serial data is present, GOTO OBD System
Check. Refer to Driveability and Emissions in
Engine section.
If the lamp stays ON or stays OFF, GOTO “Check
Trans” Check in Transmission Control System
(4L30–E) section.
2. Drive the vehicle. During the test drive, be sure that
the transmission achieves normal operating
temperature (approx. 20 minutes).
Allow the transmission to go through all of its gear
ranges, checking shift timing and firmness. Duplicate
the owner’s complaint condition as closely as
possible during the test drive.
3. If, during the test drive, the “CHECK TRANS” lamp
comes on, use the scan tool to check for trouble
codes.
4. If, during the test drive, a problem is felt, but the
“CHECK TRANS” lamp does not come on and no
trouble codes are present, drive the vehicle with the
PCM disconnected (manually shifting the vehicle).
In Manual L, the vehicle operates in first gear.
In Manual 2, the vehicle operates in third gear.
In Manual 3 or “D”, the vehicle operates in fourth
gear.
If the problem still exists with the PCM disconnected,
refer to Mechanical/Hydraulic Diagnosis in this
section.
5. If no problem has been found at this point, check all
underhood connections that supply power to the PCM
and ignition fuses. Physically and visually inspect all
the PCM harness connectors for loose or corroded
terminals. Inspect the PCM ground points.

7A–13 AUTOMATIC TRANSMISSION (4L30–E)
Mechanical / Hydraulic Diagnosis Symptoms Index
Perform Preliminary Inspection First!
CHART
SYMPTOMS
1NO ENGINE START IN NEUTRAL OR PARK
2NO FORWARD GEARS IN ANY RANGE/NO REVERSE
3NO ENGINE BRAKE IN ANY RANGE
4POOR SHIFTING IN ALL GEARS (ALL HARSH OR ALL SOFT)
5aDELAYS IN DRIVE AND REVERSE
5bDELAYS IN REVERSE ONLY
6DIAGNOSTIC TROUBLE CODE (DTC) P0730
7HARSH 1–2 SHIFT
8HARSH 3–4 SHIFT
9a3–2 DOWNSHIFT COMPLAINT
9bHARSH SHIFT WHEN SHIFTING INTO “D” OR ACCELERATING FROM STOP
9cCOASTDOWN HARSH SHIFT OR CLUNK AT 3–2 DOWNSHIFT
10INTERMITTENT 4TH TO 2ND GEAR DOWNSHIFT AT STEADY SPEED
11ENGINE FLARE AT SHIFTING DURING TURNING ONLY
12ENGINE FLARE DURING 1–2 OR 2–3 SHIFT
13SHUDDER ONLY DURING TORQUE CONVERTER CLUTCH (TCC) APPLYING
14POSSIBLE CAUSES OF TRANSMISSION NOISE
15aPOSSIBLE CAUSES OF LOW LINE PRESSURE
15bPOSSIBLE CAUSES OF HIGH LINE PRESSURE
16POSSIBLE CAUSES OF TRANSMISSION FLUID LEAKS
NOTE: Numbers with parenthesis on the following charts
refer to Parts List at end of this section.
Chart 1: No Engine Start In Neutral Or Park
StepActionYe sNo
1Does engine start when shift lever moved from drive to neutral
mostly in hot condition?
Go to Step 2Go to Step 3
2Does engine start in park at any condition?Re–test vehicleGo to Step 4
3Does engine also not start in neutral when shift lever moved from
park to neutral?
Go to Step 4Go to Step 5
4Check mode switch (63) setting. Readjust if necessary.
Problems fixed?
Re–test vehicleGo to Step 5
5Check start circuit of mode switch (63) open in neutral.
Was open found?Locate and repair
open(s)Replace mode
switch (63)

7A–15 AUTOMATIC TRANSMISSION (4L30–E)
Chart 4: Poor Shifting In All Gears (All Harsh Or All Soft)
StepActionYe sNo
1Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2Go to Step 3
21. Check for these conditions which could affect clutch apply
time:
– Defective band apply solenoid (323).
– Defective servo or/and accumulator piston.
– Excessive clutch piston travel.
2. Check of possible causes of internal leaks:
– Cut or damaged sealing ring(s)
– Damaged sealing gasket(s)
– Check ball missing or out of location in 2nd and 3rd clutch
pistons.
3. Check for caused of burned clutch plates or band.
Was the problem found?
Repair or replace—
3Was the line pressure high?
Go to Step 4
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section
4Were DTCs P0560 and P0705 set?
Diagnose those
DTC(s) first
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section
Chart 5a: Delays In Drive And Reverse
NOTE: A short delay (less than 3 seconds) when first
engaging drive or reverse after allowing vehicle to sit
overnight is normal.
Step
ActionYe sNo
1Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?More than 3
second delay in
drive and reverse
with engine off 1
hour or less.
Teflon seals (508)
on turbine shaft
damaged. Repair
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section.
Chart 5b: Delays In Reverse Only
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.
2Main case valve body gasket (88) damaged.
– Reverse check ball (85) in valve body (84) missing or out of
location.
– Check for restrictions at valve body transfer plate orifice.
Was the problem found?
Repair—

7A–16
AUTOMATIC TRANSMISSION (4L30–E)
Chart 6: Diagnostic Trouble Code (DTC) P0730
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
21. 1st and 2nd gear missing or 3rd and 4th gear missing.
Check appropriate shift valve. If OK replace solenoid.
2. No engine brake in any range (All ranges in Drive and Reverse
are OK).
Check for suspected conditions modifying delays to clutch
apply:
– Overrun clutch seal damaged.
– Excessive overrun clutch piston travel.
– Defective 3–4 accumulator piston.
– Causes of internal leaks.
– Causes of burned clutch plates.
3. 1st and 4th gear missing or 2nd and 3rd gear missing.
Shift solenoid A stuck. Replace shift solenoid A.
4. DTC P0730 is set in D range 1st gear above 3500 rpm.
Go to Step 3.
5. DTC P0730 is set in D range 3rd gear between 55-80 mph.
NOTE: Perform this test within safe and legal limits.
Check for suspected conditions modifying delays to clutch
apply:
– 4th clutch seal damaged.
– Excessive 4th clutch piston travel.
– Defective 3–4 accumulator piston.
– Causes of internal leaks.
– Causes of burned clutch plates.
Was the problem found?
Repair or replace—
3Check 3rd gear in “D” in winter mode.
Does vehicle move?Shift solenoid A
stuck. Replace
shift solenoid A.
Go to Step 4
4Check for suspected conditions modifying delays to clutch apply:
– 2nd clutch seal damaged.
– Excessive 2nd clutch piston travel.
– Defective accumulator piston.
– Causes of internal leaks.
– Check ball missing or out of location in 2nd clutch.
– Seals cut, damaged or missing.
– Gaskets defective.
– Causes of burned clutch plates.
Was the problem found?
Repair or replace—