clutch OPEL FRONTERA 1998 Workshop Manual

6E–181 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
Lack of Power, Sluggish or Spongy Symptom
StepActionVa l u e ( s )Ye sNo
1DEFINITION:
Engine delivers less than expected power. Little or no
increase in speed when accelerator pedal is pushed
down part-way.
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2
Go to OBD
System
Check
21. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
—Verify repairGo to Step 3
3Was a visual/physical check performed?
—Go to Step 4
Go to Visual/
Physical
Check
41. Remove and check the air filter element for dirt or
restrictions. Refer to
Air Intake System in
On-Vehicle Service.
2. Replace the air filter element if necessary.
Was a repair required?
—Verify repairGo to Step 5
51. Check AP sensor system. Refer to AP sensor
diagnostic
.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 6
61. Check for water-or alcohol-contaminated fuel.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 7
71. Using a Tech 2, Injector test.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 8
81. Check the ECM grounds for the cleanliness,
tightness and proper locations. Refer to the ECM
wiring diagrams in
Electrical Diagnosis.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 9
91. Check the exhaust system for possible restriction:
Inspect the exhaust system for damaged or
collapsed pipes.
Inspect the muffler for heat distress or possible
internal failure.
Check for a possible plugged catalytic
converter by checking the exhaust system
back pressure. Refer to
Restricted Exhaust
System Check
.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 10
101. Check the torque converter clutch (TCC) for proper
operation. Refer to
Transmission Diagnosis.
2. If a problem is found, repair as necessary.
Was a problem found?
—Verify repairGo to Step 11

6E–200
4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
SymptomsInitial DiagnosisDefault Section(s)
Hesitation, Sag, Stumble1. OBD system check.
2. AP.
3. MAP output check.
4. Fuel system diagnosis.
5. Injector system.Generator Output Voltage (refer
to
Chassis Electrical),
Calibration ID/Service Bulletins,
Ignition System Check
Rough, Unstable, or Incorrect Idle,
Stalling1. OBD system check.
2. Fuel injector test.MAP Output Check, Throttle
Linkage, A/C Clutch Control
Circuit Diagnosis, Calibration
ID/Service Bulletins, Generator
Output Voltage (refer to
Chassis
Electrical
), Exhaust Diagnosis
Poor Fuel Economy1. OBD system check.
2. Careful visual/physical inspection.
3. Injector system.
4. Cooling system.TCC Operation, Exhaust
System (refer to
Engine
Exhaust
)
Engine Cranks But Will Not Run1. OBD system check.Fuel System Electrical
Diagnosis, Fuel System
Diagnosis, Fuel Injector Test.
Excessive Exhaust Emissions or
Odors1. OBD system check.
2. Emission test.
3. Cooling system.
4. Fuel system diagnosis.
5. Fuel injector test.
6. Injector system.
7. MAP output check.Exhaust Diagnosis, Calibration
ID/Service Bulletins
Dieseling, Run-On1. OBD system check.
2. Careful visual/physical inspection.
3. Fuel system diagnosis.—

6E–225 4JX1–TC ENGINE DRIVEABILITY AND EMISSIONS
General Description
(ECM and Sensors)
57X Reference ECM Input
The engine control module (ECM) uses this signal from
the crankshaft position (CKP) sensor to calculate engine
RPM and crankshaft position at all engine speeds. The
ECM also uses the pulses on this circuit to initiate injector
pulses. If the ECM receives no pulses on this circuit, DTC
P0337 will set. The engine will not start and run without
using the 57X reference signal.
A/C Request Signal
This signal tells the ECM when the A/C mode is selected
at the A/C control head.
Refer to
A/C Clutch Circuit Diagnosis for A/C wiring
diagrams and diagnosis for the A/C electrical system.
Crankshaft Position (CKP) Sensor
The crankshaft position (CKP) sensor provides a signal
used by the engine control module (ECM) to calculate the
ignition sequence. The CKP sensor initiates the 57X
reference pulses which the ECM uses to calculate RPM
and crankshaft position.
Refer to
Electronic Ignition System for additional
information.
Camshaft Position (CMP) Sensor and
Signal
The camshaft position (CMP) sensor sends a CMP signal
to the ECM. The ECM uses this signal as a “cylinder
distinction” to trigger the injectors in the power order. If the
ECM detects an incorrect CMP signal while the engine is
running, DTC P0341 will set, and the ECM triggers the
injectors in the power order.
Refer to
DTC P0341.
Engine Coolant Temperature (ECT) Sensor
The engine coolant temperature (ECT) sensor is a
thermistor (a resistor which changes value based on
temperature) mounted in the engine coolant stream. Low
coolant temperature produces a high resistance of
100,000 ohms at –40
C (–40F). High temperature
causes a low resistance of 70 ohms at 130
C (266F).
The ECM supplies a 5-volt signal to the ECT sensor
through resistors in the ECM and measures the voltage.
The signal voltage will be high when the engine is cold and
low when the engine is hot. By measuring the voltage, the
ECM calculates the engine coolant temperature. Engine
coolant temperature affects most of the systems that the
ECM controls.
The Tech 2 displays engine coolant temperature in
degrees. After engine start-up, the temperature should
rise steadily to about 85
C (185F). It then stabilizes
when the thermostat opens. If the engine has not been
run for several hours (overnight), the engine coolanttemperature and intake air temperature displays should
be close to each other. A hard fault in the engine coolant
sensor circuit will set DTC P0117 or DTC P0118.
0016
Electrically Erasable Programmable Read
Only Memory (EEPROM)
The electrically erasable programmable read only
memory (EEPROM) is a permanent memory chip that is
physically soldered within the ECM. The EEPROM
contains the program and the calibration information that
the ECM needs to control powertrain operation.
Unlike the PROM used in past applications, the EEPROM
is not replaceable. If the ECM is replaced, the new ECM
will need to be programmed. Equipment containing the
correct program and calibration for the vehicle is required
to program the ECM.
Intake Air Temperature (IAT) Sensor
The intake air temperature (IAT) sensor is a thermistor
which changes its resistance based on the temperature of
air entering the engine. Low temperature produces a high
resistance of 100,000 ohms at –40
C (–40F). High
temperature causes low resistance of 70 ohms at 130
C
(266
F) . The ECM supplies a 5-volt signal to the sensor
through a resistor in the ECM and monitors the signal
voltage. The voltage will be high when the incoming air is
cold. The voltage will be low when the incoming air is hot.
By measuring the voltage, the ECM calculates the
incoming air temperature.
The Tech 2 displays the temperature of the air entering
the engine. The temperature should read close to the
ambient air temperature when the engine is cold and rise
as underhood temperature increases. If the engine has
not been run for several hours (overnight), the IAT sensor
temperature and engine coolant temperature should read
close to each other. A fault in the IAT sensor circuit will set
DTC P0112 or DTC P0113.

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

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 2000 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 (V6 3.2L 6VD1 Model) 7A–24. . .
Shift Speed Chart (V6 3.5L 6VE1 Model) 7A–26. .
Lockup Speed Chart (V6 3.2L 6VD1 Model) 7A–28
Lockup Speed Chart (V6 3.5L 6VE1 Model) 7A–28
Changing Transmission Fluid 7A–29. . . . . . . . . . . . .
Selector Lever 7A–29. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection 7A–29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–30. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mode Switch 7A–31. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A–31. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–31. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission (With Transfer Case) 7A–33. . . . . . . .
Transmission And Associated Parts 7A–33. . . . . .
Removal 7A–33. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–35. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Main Case Valve Body) 7A–39. . . . . . . . .
Removal 7A–39. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–39. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Adapter Case Valve Body) 7A–40. . . . . . .
Removal 7A–40. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–40. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Main Case) 7A–41. . . . . . . .
Removal 7A–41. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–41. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Adapter Case) 7A–43. . . . . .
Removal 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powertrain Control Module (PCM) 7A–43. . . . . . . . .
Removal 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–43. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speed Sensor (Extension Housing) 7A–44. . . . . . . .
Removal 7A–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–44. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Oil Temperature Sensor
(Adapter Case) 7A–44. . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A–44. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–45. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Oil Seal (Converter Housing) 7A–45. . . . . . . .
Removal 7A–45. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–45. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Oil Seal (Extension Housing) 7A–46. . . . . . . . .
Removal 7A–46. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A–46. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission (4L30–E) 7A–46. . . . . . . . . . . . . . . . . .
Disassembly 7A–46. . . . . . . . . . . . . . . . . . . . . . . . . .
Reassembly 7A–50. . . . . . . . . . . . . . . . . . . . . . . . . .
Converter Housing And Oil Pump Assembly 7A–60
Disassembled View 7A–60. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–60. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–60. . . . . . . . . . . . . . . . . .
Reassembly 7A–60. . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pump 7A–61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A–61. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–61. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–61. . . . . . . . . . . . . . . . . .
Reassembly 7A–61. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Case Valve Body 7A–62. . . . . . . . . . . . . . . . . . .
Disassembled View 7A–62. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–62. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–63. . . . . . . . . . . . . . . . . .
Reassembly 7A–63. . . . . . . . . . . . . . . . . . . . . . . . . .
Adapter Case Valve Body 7A–64. . . . . . . . . . . . . . . .
Disassembled View 7A–64. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–64. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–64. . . . . . . . . . . . . . . . . .
Reassembly 7A–64. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch And Sprag Unit 7A–65. . . . . . . . . . . . . .
Disassembled View 7A–65. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–65. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–66. . . . . . . . . . . . . . . . . .

7A–2
AUTOMATIC TRANSMISSION (4L30–E)
Reassembly 7A–66. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch 7A–67. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A–67. . . . . . . . . . . . . . . . . . . .
Disassemble 7A–67. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–67. . . . . . . . . . . . . . . . . .
Reassembly 7A–67. . . . . . . . . . . . . . . . . . . . . . . . . .
Sprag Unit 7A–69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A–69. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–69. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–69. . . . . . . . . . . . . . . . . .
Reassembly 7A–69. . . . . . . . . . . . . . . . . . . . . . . . . .
Second Clutch 7A–70. . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A–70. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–70. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–71. . . . . . . . . . . . . . . . . .
Reassembly 7A–71. . . . . . . . . . . . . . . . . . . . . . . . . .
3–4 Accumulator Piston 7A–72. . . . . . . . . . . . . . . . . .
Disassembled View 7A–72. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–72. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–73. . . . . . . . . . . . . . . . . .
Reassembly 7A–73. . . . . . . . . . . . . . . . . . . . . . . . . .
Reverse Clutch Piston And Center Support 7A–74.
Disassembled View 7A–74. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–75. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–75. . . . . . . . . . . . . . . . . .
Reassembly 7A–75. . . . . . . . . . . . . . . . . . . . . . . . . .
Overrun Clutch And Turbine Shaft 7A–76. . . . . . . . .
Disassembled View 7A–76. . . . . . . . . . . . . . . . . . . .
Disassembly 7A–77. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A–77. . . . . . . . . . . . . . . . . .
Reassembly 7A–77. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data And Specification 7A–79. . . . . . . . . . . . . .
Special Tools 7A–83. . . . . . . . . . . . . . . . . . . . . . . . . . .
4L30–E Parts List 7A–86. . . . . . . . . . . . . . . . . . . . . . .

7A–3 AUTOMATIC TRANSMISSION (4L30–E)
Service Precaution
WARNING: IF SO EQUIPPED WITH A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS),
REFER TO THE SRS COMPONENT AND WIRING
LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS
WIRING. WHEN YOU ARE PERFORMING SERVICE
ON OR NEAR THE SRS COMPONENTS OR THE SRS
WIRING, REFER TO THE SRS SERVICE
INFORMATION. FAILURE TO FOLLOW WARNINGS
COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.
Construction
A07RS001
Legend
(1) Torque Converter Clutch (TCC)
(2) Fourth Clutch (C4)
(3) Overrun Clutch (OC)
(4) Overdrive Unit
(5) Reverse Clutch (RC)
(6) Second Clutch (C2)(7) Third Clutch (C3)
(8) Ravigneaux Planetary Gear Set
(9) Brake Band (B)
(10) Overdrive Free Wheel (One Way Clutch)
(OFW)
(11) Principle Sprag Assembly (One Way Clutch)
(PFW)

7A–5 AUTOMATIC TRANSMISSION (4L30–E)
Normal Operation Of 2000 4L30–E
Tr a n s m i s s i o n
Torque Converter Clutch (TCC)
Application Conditions:
The TCC is normally applied in 2nd, 3rd and 4th gears
only when all of the following conditions exist:
— The engine coolant temperature is above 70
C
(158
F).
— The brake pedal is released.
— The shift pattern requests TCC apply.
Moreover, TCC is always applied in 2nd, 3rd and 4th
gears when the transmission oil temperature is above
135
C (275F).
This mode should be canceled at 125
C (257F).
ATF Warning Lamp
The ATF warning lamp will be constantly on (not flashing)
if the transmission oil temperature is above 145
C
(293
F).
The ATF warning lamp goes off again when the
transmission oil temperature is below 125
C (257F).
Special Shift Pattern When The Engine Is
Cold:
A special shift pattern is activated when the engine
coolant temperature is below 70
C (158F). (3–4 shifts,
for example, are delayed for small throttle openings and
will occur a few MPH higher.)
Diagnosis
Introduction
The systematic troubleshooting information covered by
this Section offers a practical and systematic approach to
diagnosing 4L30–E transmission, using information that
can be obtained from road tests, electrical diagnosis, oil
pressure checks or noise evaluation.
The key to correcting a complaint is to make use of all of
the available symptoms and logically letting them direct
you to the cause.
When dealing with automatic transmission complaints, it
is best to gather as many symptoms as possible before
making the decision to remove the transmission from the
vehicle.
Frequently, the correction of the complaint does not
require removal of the transmission from the vehicle.
Driver Information
To analyze the problem fill out a complete description of
the owner’s complaint.
Please draw a circle around the right information and
complete the following form. (The next page is an
example of a completed form). You can draw a circle
around many numbers if you are not sure.

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 (USUALLY WITH WARM ENGINE)
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–14
AUTOMATIC TRANSMISSION (4L30–E)
Chart 2: No Forward Gears In Any Range/No Reverse
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 internal linkage:
– Manual linkage (58) not moving manual valve (326).
2. Check for internal mechanical damage:
– Turbine shaft (506) broken loose.
– Overrun roller clutch (516) broken loose.
Was the problem found?
Repair or replace—
Chart 3: No Engine Brake In Any Range
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 overrun clutch leaks caused by:
– Damaged piston lip (513)
– Check ball defective (504)
2. Check for overrun lockout valve (705) stuck by foreign
material.
3. Check for leaks at turbine shaft (506) caused by:
– Teflon seal rings damaged (508)
– Excessive wear of turbine shaft bearing surfaces.
Was the problem found?
Repair or replace—