ESP ISUZU AXIOM 2002 Service Owners Manual

7A1±22
TRANSMISSION CONTROL SYSTEM (4L30±E)
IMPORTANT:Only four Fail Records can be stored.
Each Fail Record is for a different DTC. It is possible that
there will not be Fail Records for every DTC if multiple
DTCs are set.
Clear DTC
NOTE: If you clear the DTC (Diagnostic Trouble Codes)
you will not be able to read any codes recorded during the
last occurrence.
NOTE: To use the DTC again to identify a problem, you
will need to reproduce the fault or the problem. This may
require a new test drive or just turning the ignition on (this
depends on the nature of the fault).
1. If you have a Tech 2:
1. Connect the Tech 2 if it is still not connected GO
THROUGH Tech 2 OBD II CONNECTION.
2. Push ªF1: Clear DTC Informationº in the
Application Menu and answer ªYesº to the
question ªDo you want to clear DTC's?º
a. When a malfunction still exists and the Tech 2
displays ª4L30E CODES NOT CLEAREDº. This
means that the problem is still there or that the
recovery was not done. Please GO TO DTC
CHECK.
b. When a malfunction has been repaired and the
recovery is done. The Tech 2 displays ª4L30E
CODES CLEAREDº.
2. If you have no Tech 2:
Disconnect the PCM battery feed as necessary.
DTC Check
1. Diagnostic Trouble Codes (DTC) have been identified
by Tech 2.
2. You have written the list of the DTCs. The order of the
malfunctions has no meanings for this PCM. Usually
only one or two malfunctions should be set for a given
problem.
3. Check directly the DTCs you identified. The DTCs are
sorted by number. Refer to
Diagnostic Trouble Code
(DTC) Identification in this section.
PCM Precaution
The PCM can be damaged by:
1. Electrostatic discharge
2. The short circuit of some terminals to voltage or to
ground.
Electrostatic Discharge Damage Description:
1. Electronic components used to control systems are
often designed to carry very low voltage, and are very
susceptible to damage caused by electrostatic
discharge. It is possible for less than 100 volts of
static electricity to cause damage to some electronic
components. By comparison, it takes as much as
4,000 volts for a person to even feel the zap of a static
discharge.2. There are several ways for a person to become
statically charged. The most common methods of
charging are by friction and induction. An example of
charging by friction is a person sliding across a car
seat, in which a charge of as much as 25,000 volts
can build up. Charging by induction occurs when a
person with well insulated shoes stands near a highly
charged object and momentarily touches ground.
Charges for the same polarity are drained off, leaving
the person highly charged with the opposite polarity.
Static charges of either type can cause damage,
therefore, it is important to use care when handling
and testing electronic components.
NOTICE: To prevent possible electrostatic
discharge damage:
1. Do not touch the PCM connector pins or soldered
components on the PCM circuit board.
2. Be sure to follow the guidelines listed below if
servicing any of these electronic components:
3. Do not open the replacement part package until it is
time to install the part.
4. Avoid touching electrical terminals of the part.
5. Before removing the part from its package, ground
the package to a known good ground on the vehicle.
6. Always touch a known good ground before handling
the part. This step should be repeated before
installing the part if the part has been handled while
sliding across the seat, while sitting down from a
standing position or while walking some distance.
Information On PCM
1. The Powertrain Control Module (PCM) is located in
the center console and is the control center of the
electronic transmission control system.
2. The PCM must be maintained at a temperature below
85
(185
F) at all times. This is most essential if the
vehicle is put through a paint baking process. The
PCM will become inoperative if its temperature
exceeds 85
C (185
F). Therefore, it is
recommended that the PCM be removed or that
temporary insulation be placed around the PCM
during the time the vehicle is in a paint oven or other
high temperature process.
3. The PCM is designed to process the various inputs
and then respond by sending the appropriate
electrical signals to control transmission upshift,
downshift, shift feel and torque converter clutch
engagement.
4. The PCM constantly interprets information from the
various sensors, and controls the systems that affect
transmission and vehicle performance. By analyzing
operational problems, the PCM is able to perform a
diagnostic function by displaying DTC(s) and aid the
technician in making repairs.

TRANSMISSION CONTROL SYSTEM (4L30±E)7A1±29
DTC P0705 Transmission Range Switch (Mode Switch) Illegal Position
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:

The transmission linkage from the select lever to the manual
valve is adjusted properly.

Diagnostic circuit check.
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 ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when the ªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
4. Select each transmission range: DL, D2, D3, D4, N, R, and P.
Does each selected transmission range match the scan tool
ªRange Switchº display?
Go to Diagnostic
Aids
Go to Step 4
4Are all range switch pin displays incorrect?Go to Step 5Go to Step 6
5Check fuse and wiring to the 8±way connector terminal 5(D) for
opens.
Refer to
Mode Switch in Automatic Transmission (4L30±E)
section.
If no problem was found, replace the range switch.
Is the replacement complete?
Go to Step 9Ð
61. Disconnect the 8±way range switch connector.
2. Using ohmmeter, check continuity between terminal 5(D) and
respectively terminals 3(G), 6(C), 7(B) and 8(A) of the 8±way
range switch connector.
3. Move shift selector lever through all positions and compare
results with ªRange Switch Logic Tableº.
Is one range switch pin display incorrect?
Go to Step 7Go to Step 8
7Check the affected wiring and connector, and repair.
Is the repair complete?
Go to Step 9Ð
8Check the Powertrain Control Module (PCM) connectors for poor
connection.
If no problem was found, replace the PCM.
Is the replacement complete?
Go to Step 9Ð
91. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and road test the vehicle.
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±32
TRANSMISSION CONTROL SYSTEM (4L30±E)
DTC P0706 Transmission Range Switch (Mode Switch) Performance
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:

The transmission linkage from the select lever to the manual
valve is adjusted properly.

Diagnostic circuit check.
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 ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when the ªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
4. Select each transmission range: DL, D2, D3, D4, N, R, and P.
Does each selected transmission range match the scan tool
ªRange Switchº display?
Go to Diagnostic
Aids
Go to Step 4
4Are all range switch pin displays incorrect?Go to Step 5Go to Step 6
5Check fuse and wiring to the 8±way connector terminal 5(D) for
opens.
Refer to
Mode Switch in Automatic Transmission (4L30±E)
section.
If no problem was found, replace the range switch.
Is the replacement complete?
Go to Step 9Ð
61. Disconnect the 8±way range switch connector.
2. Using ohmmeter, check continuity between terminal 5(D) and
respectively terminals 3(G), 6(C), 7(B) and 8(A) of the 8±way
range switch connector.
3. Move shift selector lever through all positions and compare
results with ªRange Switch Logic Tableº.
Is one range switch pin display incorrect?
Go to Step 7Go to Step 8
7Check the affected wiring and connector, and repair.
Is the repair complete?
Go to Step 9Ð
8Check the Powertrain Control Module (PCM) connectors for poor
connection.
If no problem was found, replace the PCM.
Is the replacement complete?
Go to Step 9Ð
91. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and road test the vehicle.
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±61
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
2. This test checks the function of the range switch
(mode switch).
3. This test checks that the scan tool commanded all
shifts, all shifts solenoids responded correctly, but
all the shifts did not occur.
DTC P0751 Shift Solenoid A Performance (Stuck Off)
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
Emission in
Engine section
21. 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 ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when the ªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
4. With the engine operating, apply the brake pedal and select
each transmission range DL, D2, D3, D4, N, R, and P.
Does each selected transmission range match the ªTR Switchº on
the scan tool?
Go to Step 3
Go to ªRange
Switch Logic
Tableº
31. While the engine is operating, raise the drive wheels.
2. With the transmission in D4 range, use the scan tool to
command 1st, 2nd and 3rd, and 4th gears while accelerating
the vehicle.
Was a 1±1±4±4 only shift pattern detected? (Road testing the
vehicle may be necessary).
Go to Step 4
Go to Diagnostic
Aids
4Check the shift solenoid/hydraulic circuit for:

One or both of the shift solenoids for an internal malfunction.

Contamination or sediment in one or both of the shift
solenoids.

Damaged seals on one or both of the shift solenoids.
Refer to
Solenoid (Main Case Valve Body) in Automatic
Transmission (4L30±E) section.
Was a problem found and corrected?Go to Step 5
Go to Diagnostic
Aids
51. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and road test the vehicle.
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±63
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
2. This test checks the function of the range switch
(mode switch).
3. This test checks that the scan tool commanded all
shifts, all shifts solenoids responded correctly, but
all the shifts did not occur.
DTC P0752 Shift Solenoid A Performance (Stuck On)
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
21. 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 ªFreeze
Frameº and ªFailure Recordsº for reference, as data will be lost
when the ªClear Infoº function is used.
3. Record the DTC ªFreeze Frameº and ªFailure Recordsº.
4. With the engine operating, apply the brake pedal and select
each transmission range DL, D2, D3, D4, N, R, and P.
Does each selected transmission range match the ªTR Switchº on
the scan tool?
Go to Step 3
Go to ªRange
Switch Logic
Tableº
31. While the engine is operating, raise the drive wheels.
2. With the transmission in D4 range, use the scan tool to
command 1st, 2nd and 3rd, and 4th gears while accelerating
the vehicle.
Was a 2±2±3±3 only shift pattern detected? (Road testing the
vehicle may be necessary).
Go to Step 4
Go to Diagnostic
Aids
4Check the shift solenoid/hydraulic circuit for:

One or both of the shift solenoids for an internal malfunction.

Contamination or sediment in one or both of the shift
solenoids.

Damaged seals on one or both of the shift solenoids.
Refer to
Solenoid (Main Case Valve Body) in Automatic
Transmission (4L30±E) section.
Was a problem found and corrected?Go to Step 5
Go to Diagnostic
Aids
51. After the repair is complete, use the scan tool to select ªDTCº,
then ªClear Infoº function and road test the vehicle.
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

RESTRAINT CONTROL SYSTEM 9J1±4
SRS Diagnostic System Check
The diagnostic procedures used in this section are
designed to find and repair SRS malfunctions. To get the
best results, it is important to use the diagnostic charts
and follow the sequence listed below:
A. Perform the ªSRS Diagnostic System Check.º
The ªSRS Diagnostic System Checkº must be the
starting point of any SRS diagnostics. The ªSRS
Diagnostic System Checkº checks for proper ªAIR
BAGº warning lamp operation, the ability of the SDM
to communicate through the ªSerial Dataº line and
whether SRS diagnostic trouble codes exist.
B. Refer to the proper diagnostic chart as directed by the
ªSRS Diagnostic System Check.º
The ªSRS Diagnostic System Checkº will lead you to
the correct chart to diagnose any SRS malfunctions.
Bypassing these procedures may result in extended
diagnostic time, incorrect diagnosis and incorrect
parts replacement.
C. Repeat the ªSRS Diagnostic System Checkº after any
repair or diagnostic procedures have been
performed.
Performing the ªSRS Diagnostic System Checkº after
all repair or diagnostic procedures will ensure that the
repair has been made correctly and that no other
malfunctions exist
Circuit Description
When the ignition switch is first turned ªONº, ªignition 1º
voltage is applied from the ªSRS±1º fuse to the SDM at
the ªignition 1º input terminals ª12º. The SDM responds
by flashing the ªAIR BAGº warning lamp seven times
while performing tests on the SRS.
Notes On System Check Chart:
Number(s) below refer to step number(s) on the ªSRS
Diagnostic System Checkº chart.
1. The ªAIR BAGº warning lamp should flash seven
times after ignition is first turned ªON.º
2. After the ªAIR BAGº warning lamp flashes seven
times, it should turn ªOFF.º
3. Improper operation of the ªAIR BAGº warning lamp
is indicated. This test differentiates a warning lamp
stays ªONº condition from a warning lamp does not
come ªONº condition.
4. This test checks for the proper operation of the
ªSerial Dataº line. This test will also determine
whether history diagnostic trouble codes are stored
and, if so, identify them.
5. This test checks for proper operation of the ªSerial
Dataº line. This test will also identify the stored
diagnostic trouble codes and whether they are
current or history.
Diagnostic Aids:
The order in which diagnostic trouble codes are
diagnosed is very important. Failure to diagnose the
diagnostic trouble codes in the order specified may result
in extended diagnostic time, incorrect diagnosis and
incorrect parts Replacement.

RESTRAINT CONTROL SYSTEM 9J1±8
Chart B ªAIR BAGº Warning Lamp Comes ªONº Steady
D09R200001
Circuit Description:
When the ignition switch is first turned ªONº, ªignition 1º
voltage is applied from the ªMA01º meter fuse to ªAIR
BAGº, warning lamp which is connected to ªSRS warning
lampº, terminal ª7º. The ªSRS±1º fuses apply system
voltage to the ªignition 1º inputs, terminals ª12º. The SDM
responds by flashing the ªAIR BAGº warning lamp 7
times. If ªignition 1º voltage is less than 9 volts, the ªAIR
BAGº warning lamp will come ªONº solid with no DTCs
set.
Chart Test Description:
Number (s) below refer to step number (s) on the
diagnostic chart.
2. This test checks for an open in the ªignition 1º circuit
to the SDM.
3. This test checks for the voltage of ªignition 1.º
4. This test determines whether the malfunction is a
short to ground in CKT IB04 ± GRN.

RESTRAINT CONTROL SYSTEM 9J1±10
Chart C ªAIR BAGº Warning Lamp Does Not Comes ªONº Steady
D09R200001
Circuit Description:
When the ignition switch is first turned ªONº, ªignition 1º
voltage is applied from the ªMA01º meter fuse to the ªAIR
BAGº warning lamp which is connected to ªSRS warning
lampº, terminal ª7º. The ªSRS±1º fuse apply system
voltage to the ªignition 1º inputs, terminals ª12º. The SDM
responds by flashing the ªAIR BAGº warning lamp seven
times. If ªignition 1º voltage is more than 16 volts, the
ªAIR BAGº warning lamp will be still ªOFFº solid with no
DTCs set.
Chart Test Description:
Number(s) below refer to step number(s) on the
diagnostic chart:1. This test decides whether power is available to SDM
warning lamp power feed circuit.
2. This test determines whether the voltage is present
in the warning lamp circuit.
3. This test determines if the malfunction is in the
instrument cluster.
4. This test checks for open in the warning lamp
circuitry.
5. This test isolates the IB04±GRN circuit and checks
for a short in the IB04±GRN circuit to B+.
8. This test checks for a short from the SDM warning
lamp power feed circuit to ground.
9. This test determines whether the short to ground is
due to a short in the wiring.

9J1±13
RESTRAINT CONTROL SYSTEM
DTC 15 Passenger Deployment Loop Resistance High
D09R200001
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical malfunctions within
itself. Upon passing these tests ªignition 1º, and
deployment loop voltages are measured to ensure they
are within their respective normal voltage ranges. The
SDM then proceeds with the ªResistance Measurement
Testº. ªPassenger Bag Lowº terminal ª16º is grounded
through a resister and the passenger current source
connected to ªPassenger Bag Highº terminal ª15º allows a
known amount of current to flow. By monitoring the
voltage difference between ªPassenger Bag Highº and
ªPassenger Bag Lowº the SDM calculates the combined
resistance of the passenger air bag assembly, harness
wiring CKTs IB07±YEL/GRN and IB08±YEL/RED
connector terminal contact.
DTC Will Set When:
The combined resistance of the passenger air bag
assembly, harness wiring CKTs IB07±YEL/GRN and
IB08±YEL/RED, and connector terminal contact is above
a specified value. This test is run once each ignition cycle
during the ªResistance Measurement Testº when:
1. No ªhigher priority faultsº are detected during
ªTurn±ON.º
2. ªIgnition 1º voltage is in the specified value.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp and sets a
diagnostic trouble code.
DTC Will Clear When:
The ignition switch is turned ªOFF.º

RESTRAINT CONTROL SYSTEM 9J1±16
DTC 16 Passenger Deployment Loop Resistance Low
D09R200001
Circuit Description:
When the ignition switch is turned ªONº, the SDM will
perform tests to diagnose critical malfunctions within
itself. Upon passing these tests ªignition 1º, and
deployment loop voltages are measured to ensure they
are within their respective normal voltage ranges. The
SDM then proceeds with the ªResistance Measurement
Testº. ªPassenger Bag Lowº terminal ª16º is grounded
through a resistor and the passenger current source
connected to ªPassenger Bag Highº terminal ª15º allows a
known amount of current to flow. By monitoring the
voltage difference between ªPassenger Bag Highº and
ªPassenger Bag Lowº, the SDM calculates the combined
resistance of the passenger air bag assembly, harness
wiring CKTs IB07±YEL/GRN and IB08±YEL/RED
connector terminal contact.
DTC Will Set When:
The combined resistance of the passenger air bag
assembly, harness wiring CKTs IB07±YEL/GRN and
IB08±YEL/RED, and connector terminal contact is above
a specified value. This test is run once each ignition cycle
during the ªResistance Measurement Testº when:
1. No ªhigher priority faultsº are detected during
ªTurn±ONº,
2. ªIgnition 1º voltage is in the specified value.
Action Taken:
SDM turns ªONº the ªAIR BAGº warning lamp and sets a
diagnostic trouble code.
DTC Will Clear When:
The ignition switch is turned ªOFF.º