2002 ISUZU AXIOM air condition

7A1±10
TRANSMISSION CONTROL SYSTEM (4L30±E)
Functions of Input / Output Components
ComponentsFunction
Speed sensor
(fixed to transmission)Senses rotation of output shaft and feeds the data to Powertrain Control Module
(PCM).
Throttle position sensor
(TPS)
(fixed to engine)Senses the extent of throttle valve opening and the speed of the throttle valve
lever motion to open the valve. Feeds the data to PCM.
I
N
Brake switch
(fixed to brake pedal)Senses whether the driver has pressed the brake pedal or not and feeds the
information to PCM.
N
P
UMode switch (fixed to
transmission)Senses the select lever position, and feeds the information to PCM.
U
T

S
Power drive switch
(fixed to front console)Senses whether the driver has selected the power mode, and feeds the
information to PCM.
S
IT/M oil temperature sensorSenses the T/M oil temperature and feeds the data to PCMI
G
N
A
Engine coolant
temperature sensorSenses the engine coolant temperature, and feeds the data to PCM.
A
LEngine speed signalFeeds the signals monitoring engine speed to PCM from crank angle sensor.L
Air conditioning informationSenses whether the air conditioner has been switched on or not, and feeds the
information to PCM.
Winter switch (fixed to front
console)Senses whether the driver has selected the winter mode, and feeds the
information to PCM.
Cruise controller
(Overdrive OFF signal)Downshift takes place when overdrive OFF signal is received from auto cruise
controller integrated in PCM.
O
U
T
S
Shift solenoid A, BSelects shift point and gear position suited to the vehicle running condition on
the basis of PCM output.
P
U
TS
O
L
E
Band apply solenoidControls oil flow suited to the vehicle running condition on the basis of PCM
output.

S
I
G
E
N
O
I
Torque Converter
Clutch PWM solenoidControls clutch apply suited to the vehicle running condition on the basis of PCM
output.
G
N
A
LI
DForce motor
(Pressure regulator
valve)Adjusts the oil pump delivery pressure to line pressure suited to the vehicle
running condition on the basis of PCM output.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±17
Diagnostic Trouble Codes
The purpose of the ªDiagnostic Trouble Codesº mode is to
display stored PCM trouble codes.
When ªDiagnostic Trouble Codesº is selected an
ªApplication Menuº screen appears.
Clear DTC Information
The purpose of the ªClear DTC Informationº mode is to
command the clearing of stored PCM trouble codes.
When ªClear DTC Informationº is selected, a ªClear DTC
Informationº, warning screen appears. This screen
informs you that by cleaning DTC's, ªall stored DTC
information in controller will be erasedº.
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 the
trouble code cannot be erased, check the vehicle again.
DTC Information
When ªDTC Informationº is selected, an ªApplication
Menuº 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 ªData Displayº mode is to
continuously monitor data parameters.
The current actual values of all important sensors and
signals in the system are display through F1 mode.
When ªData Displayº is selected an ªApplication Menuº
appears. Please select either ªEngineº or ªTransmission
Data Displayº.
See ªTransmission Dataº on next page.
Snapshot
When ªSnapshotº is selected an ªApplication Menuº
appears.
When ªTransmission Snapshotº application is selected
from the ªApplication Menuº, a ªSnapshot Menuº
appears, displaying several options. ªSnapshotº options
may vary from one system to another.
ªSnapshotº 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 Tech 2 is powered
down. Snapshots are not lost.
Actuator Tests
The purpose of ªActuator Testsº 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: none
Solenoid
Solenoid 1-2/3-4, Solenoid 2-3, TCC Solenoid
You can operate the solenoids by pressing the ON and
OFF buttons.
Preconditions: P±N position, no vehicle speed, no engine
speed
Band Apply Solenoid
You can operate the solenoid by pressing the ON and
OFF buttons.
Preconditions: P-N position, idle engine speed, no vehicle
speed.
Pressure Control Solenoid (PCS)
You can set desired PCS Current using the ªIncrementº
(+25) and ªDecrementº (±25) button. The PC Solenoid
Data informs about PCS Current, Pressure and Duty
Cycle.
Preconditions: P±N position, no engine speed, no vehicle
speed
Reset Oil Life Monitor
Displays parameter ªOil Life Monitorº and resets to 100%
if Yes-button is pressed on Reset-question. ªNoº leaves
test.
Preconditions: no vehicle speed, no engine speed
NOTE:
Freeze Frame (Powertrain DTC A/B Type)
Freeze Frame is an element of the Diagnostic Manage-
ment System which stores various vehicle information at
the moment an emissions-related fault is stored in
memory and when the MIL is commanded on. These data
can help to identify the cause of a fault. Refer to
Storing
And Erasing Freeze Frame Data
for more detailed in-
formation.
Failure Records (Powertrain DTC C/D Type)
Failure Records data is an enhancement of the OBD II
Freeze Frame feature. Failure Records store the same
vehicle information as does Freeze Frame, but it will store
that information for any fault which is stored in on-board
memory, while Freeze Frame stores information only for
emission-related faults that command the MIL on.

7A1±26
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0218 Transmission Fluid Over Temperature
StepActionYe sNo
1Were you sent here from the ªPowertrain On±Board Diagnostic
(OBD) System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Engine section
2Perform the following checks:

Check for possible engine system problems.

Transmission fluid checking procedure. Refer to
Checking
Transmission Fluid Level and Condition in Automatic
Transmission (4L30±E) Section.
Were the checks performed?Go to Step 3Ð
31. Install the scan tool.
2. With the engine ªoffº, turn the ignition switch ªonº.
NOTE: Before clearing DTC(s), use the scan tool to record ªFailure
Recordsº for reference, as data will be lost when ªClear Infoº
function is used.
3. Record the DTC ªFailure Recordsº.
Is the TFT sensor signal voltage less than 1.54 volts?
Go to Step 4
Go to Diagnostic
Aids
41. Turn the ignition ªoffº.
2. Disconnect the transmission 7±way connector E±42
(additional DTCs may set).
3. With the engine ªoffº, turn the ignition switch ªonº.
Is the TFT sensor signal voltage greater than 4.92 volts?
Go to Internal
Wiring Harness
Check
Go to Step 5
5Inspect/repair circuit RED/BLK for a short to ground.
Was a problem found?
Go to Step 7Go to Step 6
61. Inspect the PCM for poor connections.
2. Replace the PCM if no poor connections were found.
Is the replacement complete?
Go to Step 7Ð
71. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and ensure the following conditions
are met:
TFT is less than 125
C (257
F) for at least 10 seconds.
2. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to
Step 1
Repair verified
Exit DTC table

7A1±34
TRANSMISSION CONTROL SYSTEM (4L30±E)

When diagnosing for an intermittent short or open
connection, move the wiring harness while watching
the test equipment for a change.

First diagnose and clear any engine DTCs or TP
Sensor codes. Then inspect for any transmission
DTCs that may have reset.Test Description
The number below refers to the step number on the
diagnostic chart:
3. This test checks PCM and associated wiring up to
the 7±way connector. If the voltage increases to
match chart the problem is isolated to the
transmission wiring.
DTC P0711 Transmission Fluid Temperature (TFT) Sensor Performance
StepActionYe sNo
1Was the Powertrain On±Board Diagnostic (OBD) System Check
performed?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Engine section
2Perform the transmission fluid checking procedure. Refer to
Checking Transmission Fluid Level and Condition in Automatic
Transmission (4L30±E) section.
Did you perform the fluid checking procedure?
Go to Step 3
Go to Checking
Transmission
Fluid Level and
Condition in
Automatic
Transmission
(4L30±E) section
31. Install the scan tool.
2. With the engine ªoffº, turn the ignition switch to the ªonº
position.
NOTE: Before clearing DTCs, use the scan tool in order to record
the Freeze Frame and Failure Records for reference. The Clear
Info function will erase the data.
3. Record the DTC Freeze Frame and Failure Records.
4. Select TFT on the scan tool.
5. While observing the scan tool display, move or massage the
engine wiring harness from PCM connectors E35±66 and
E35±20 to the transmission 7±way connector E±42.
Does the TFT change by more than +20
C (36
F)?
Go to Step 6Go to Step 4
41. Turn the ignition ªoffº.
2. Disconnect the transmission 7±way connector E±42.
3. Install Jumper Harness on the transmission side of the 7±way
connector E±42.
4. Using the J39200 DVOM and J35616 Connector Test Adapter
Kit, connect the DVOM leads from terminal E42±4(F) to
terminal E42±1(E).
5. Set the DVOM on MIN/MAX to measure resistance.
6. Record the TFT sensor resistance.
7. Move or massage the automatic transmission wiring harness
assembly from the PCM to the TFT sensor connector.
(See Transmission Fluid Temperature (TFT) Sensor
Specifications.)
Does the DVOM MAX display a resistance greater than the value
recorded in Action item 6 of this step?
Go to Step 7Go to Step 5
5Does the DVOM MIN display a resistance less than the value
recorded in Action item 6 of step 4?
Go to Step 8Ð
6Inspect circuit RED/BLK and RED/WHT of the engine wiring
harness for an intermittent open or short condition. Repair the
circuits if necessary.
Did you find a problem?
Go to Step 12Go to Step 11

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±35
DTC P0711 Transmission Fluid Temperature (TFT) Sensor Performance (Cont'd)
StepNo Ye s Action
7Inspect the automatic transmission wiring harness assembly for
an intermittent open in circuits RED/BLK and RED/WHT.
Did you find a problem?
Go to Step 9Go to Step 10
8Inspect the automatic transmission wiring harness assembly for
an intermittent shorted condition in circuits RED/BLK and
RED/WHT.
Did you find a problem?
Go to Step 9Go to Step 10
9Replace the automatic transmission wiring harness assembly.
Is the replacement complete?
Go to Step 12Ð
10Replace TFT Sensor. Refer to Transmission Oil Temperature
Sensor (Main Case) in Automatic Transmission (4L30±E) section.
Is the replacement complete?Go to Step 12Ð
11Replace the PCM. Refer to Powertrain Control Module (PCM) in
Automatic Transmission (4L30±E) section.
Is the replacement complete?Go to Step 12Ð
12In order to verify your repair, perform the following procedure.
1. Select DTC.
2. Select Clear Info.
3. Drive the vehicle and ensure the following conditions are met:

The TFT changes by more than 2.25
C (4.05
F) for 11
seconds since startup.

The TFT does not change by more than 20
C (36
F) within
0.200 second for a period of at least 11 seconds.
4. Select Specific DTC.
5. Enter DTC P0711.
Has the test run and passed?
System OK
Begin the
diagnosis again
Go to
Step 1

7A1±38
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Input (Cont'd)
StepNo Ye s Action
11Check the PCM for faulty connections.
Was a problem found?
Go to Step 13Go to Step 12
12Replace the PCM. Refer to Powertrain Control Module (PCM) in
Automatic Transmission (4L30±E) section.
Is the replacement complete?Go to Step 13Ð
131. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and ensure the following conditions
are met:
TFT sensor indicates a voltage greater than 0.33 volts for 2
seconds.
2. Review the scan tool ªDTC infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to
Step 1
Repair verified
Exit DTC table

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±41
DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Input (Cont'd)
StepNo Ye s Action
10Check circuit RED/BLK for an open or short to B+.
Was a problem found?
Go to Step 14Go to Step 11
11Check circuit RED/WHT for an open.
Was a problem found?
Go to Step 14Go to Step 12
12Check the PCM for faulty or intermittent connections.
Was a problem found?
Go to Step 14Go to Step 13
13Replace the PCM. Refer to Powertrain Control Module (PCM) in
Automatic Transmission (4L30±E) section.
Is the replacement complete?Go to Step 14Ð
141. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and ensure the following conditions
are met:
2. TFT sensor indicates a voltage less than 4.92 volts for 2
seconds.
3. Review the scan tool ªDTC Infoº.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to
Step 1
Repair verified
Exit DTC table

7A1±44
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0719 Brake Switch Circuit Low (Stuck On)
StepActionYe sNo
1Was the Powertrain On±Board Diagnostic (OBD) System Check
performed?
Go to Step 2
Go to Powertrain
OBD System
Check
21. Install the scan tool.
2. With the engine ªoff,º turn the ignition switch to the ªonº
position.
NOTE: Before clearing the DTC(s), use the scan tool in order to
record the ªFailure Recordsº for reference. Using the ªClear Infoº
function will erase the stored ªFailure Recordsº from the PCM.
3. Record the ªDTC Failure Recordsº, then clear the DTC(s).
4. Select ªTCC Brake Switchº on the scan tool.
5. Disconnect the brake switch connector from the brake switch.
6. Connect a test lamp from cavity I31±3 of the brake switch
connector to a known good ground.
Is the test lamp ON?
Go to Step 3Go to Step 4
3Install a J 36169±A Fused Jumper Wire from terminal I31±2 to
terminal I31±3 of the brake switch connector.
Did the TCC Brake Switch status change from Open to Closed?
Go to Step 7Go to Step 9
41. Remove the fuse ªTURN, BACK UPº.
2. Inspect the fuse for an open.
Is the fuse open?
Go to Step 5Go to Step 8
5Inspect circuit WHT/GRN for a short to ground condition. Repair
the circuit if necessary.
Did you find a short to ground condition?
Go to Step 11Go to Step 6
6Inspect circuit BRN/RED for a short to ground condition. Repair
the circuit if necessary.
Did you find a short to ground condition?
Go to Step 11Go to Step 10
7Replace the brake switch.
Is the replacement complete?
Go to Step 11Ð
8Inspect circuit WHT/GRN for an open condition. Repair the circuit
if necessary.
Did you find and correct an open condition?
Go to Step 11Ð
9Inspect circuit BRN/RED for an open.
Did you find an open condition?
Go to Step 11Go to Step 10
10Replace the PCM.
Is the replacement complete?
Go to Step 11Ð
11In order to verify your repair, perform the following procedure:
1. Select DTC.
2. Select Clear Info.
3. With the engine ªoff,º turn the ignition switch to the ªonº
position.
4. Do not depress the brake pedal.
5. Verify that the Brake Switch status indicates ªClosedº (12
volts) for 2 seconds.
6. Select Specific DTC. Enter DTC P0719.
Has the test run and passed?
System OK
Begin the
diagnosis again.
Go to
Step 1