DTC ISUZU AXIOM 2002 Service Repair Manual

0A±12
GENERAL INFORMATION
Abbreviations Charts
List of automotive abbreviations which may be used
in this manual
A Ð Ampere(s)
ABS Ð Antilock Brake System
AC Ð Alternating Current
A/C Ð Air Conditioning
ACCEL Ð Accelerator
ACC Ð Accessory
ACL Ð Air Cleaner
Adj Ð Adjust
A/F Ð Air Fuel Ratio
AIR Ð Secondary Air Injection System
Alt Ð Altitude
AMP Ð Ampere(s)
ANT Ð Antenna
ASM Ð Assembly
A/T Ð Automatic Transmission/Transaxle
ATDC Ð After Top Dead Center
ATF Ð Automatic Transmission Fluid
Auth Ð Authority
Auto Ð Automatic
BARO Ð Barometric Pressure
Bat Ð Battery
B+ Ð Battery Positive Voltage
Bbl Ð Barrel
BHP Ð Brake Horsepower
BPT Ð Backpressure Transducer
BTDC Ð Before Top Dead Center

C Ð Degrees Celsius
CAC Ð Charge Air Cooler
Calif Ð California
cc Ð Cubic Centimeter
CID Ð Cubic Inch Displacement
CKP Ð Crankshaft Position
CL Ð Closed Loop
CLCC Ð Closed Loop Carburetor Control
CMP Ð Camshaft Position
CO Ð Carbon Monoxide
Coax Ð Coaxial
Conn Ð Connector
Conv Ð Converter
Crank Ð Crankshaft
Cu. In. Ð Cubic Inch
CV Ð Constant Velocity
Cyl Ð Cylinder(s)
DI Ð Distributor Ignition
Diff Ð Differential
Dist Ð Distributor
DLC Ð Data Link Connector
DOHC Ð Double Overhead Camshaft
DTC Ð Diagnostic Trouble Code
DTM Ð Diagnostic Test Mode
DTT Ð Diagnostic Test Terminal
DVM Ð Digital Voltmeter (10 meg.)
DVOM Ð Digital Volt Ohmmeter
EBCM Ð Electronic Brake Control Module
ECM Ð Engine Control Module
ECT Ð Engine Coolant Temperature
EEPROM Ð Electronically Erasable Programmable
Read Only Memory
EGR Ð Exhaust Gas Recirculation
EI Ð Electronic Ignition
ETR Ð Electronically Tuned Receiver
EVAP Ð Evaporation EmissionExh Ð Exhaust

F Ð Degrees Fahrenheit
Fed Ð Federal (All States Except Calif.)
FF Ð Front Drive Front Engine
FL Ð Fusible Link
FLW Ð Fusible Link Wire
FP Ð Fuel Pump
FRT Ð Front
ft Ð Foot
FWD Ð Front Wheel Drive
4WD Ð Four Wheel Drive
4 x 4 Ð Four Wheel Drive
4 A/T Ð Four Speed Automatic Transmission/Transaxle
Gal Ð Gallon
GEN Ð Generator
GND Ð Ground
Gov Ð Governor
g Ð Gram
Harn Ð Harness
HC Ð Hydrocarbons
HD Ð Heavy Duty
Hg Ð Hydrargyrum (Mercury)
HiAlt Ð High Altitude
HO2S Ð Heated Oxygen Sensor
HVAC Ð Heater±Vent±Air±Conditioning
IAC Ð Idle Air Control
IAT Ð Intake Air Temperature
IC Ð Integrated Circuit / Ignition Control
ID Ð Identification / Inside Diameter
IGN Ð Ignition
INJ Ð Injection
IP Ð Instrument Panel
IPC Ð Instrument Panel Cluster
Int Ð Intake
ISC Ð Idle Speed Control
J/B Ð Junction Block
kg Ð Kilograms
km Ð Kilometers
km/h Ð Kilometer per Hour
kPa Ð Kilopascals
kV Ð Kilovolts (thousands of volts)
kW Ð Kilowatts
KS Ð Knock Sensor
L Ð Liter
lb ft Ð Foot Pounds
lb in Ð Inch Pounds
LF Ð Left Front
LH Ð Left Hand
LR ÐLeft Rear
LS Ð Left Side
LWB Ð Long Wheel Base
L±4 Ð In±Line Four Cylinder Engine
MAF Ð Mass Air Flow
MAN Ð Manual
MAP Ð Manifold Absolute Pressure
Max Ð Maximum
MC Ð Mixture Control
MFI Ð Multiport Fuel Injection
MIL Ð Malfunction Indicator Lamp
Min Ð Minimum
mm Ð Millimeter
MPG Ð Miles Per Gallon
MPH Ð Miles Per Hour
M/T Ð Manual Transmission/Transaxle
MV Ð Millivolt

INTELLIGENT SUSPENSION3F±1
AXIOM
SUSPENSION
INTELLIGENT SUSPENSION CONTROL
CONTENTS
Service Precaution 3F±2. . . . . . . . . . . . . . . . . . . . . .
General Description 3F±2. . . . . . . . . . . . . . . . . . . . .
PIN ASSIGNMENT TABLE 3F±4. . . . . . . . . . . . .
System Components 3F±4. . . . . . . . . . . . . . . . . . .
Control Unit 3F±4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Actuator 3F±4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustable Damping Force Shock Absorber 3F±4
Warning Lamp 3F±4. . . . . . . . . . . . . . . . . . . . . . . .
Vertical G-Sensor 3F±5. . . . . . . . . . . . . . . . . . . . . .
Lateral G-Sensor 3F±5. . . . . . . . . . . . . . . . . . . . . .
Acronyms and Abbreviations 3F±5. . . . . . . . . . . .
General Diagnosis 3F±5. . . . . . . . . . . . . . . . . . . . . . .
General Information 3F±5. . . . . . . . . . . . . . . . . . . .
Service Precautions 3F±5. . . . . . . . . . . . . . . . . . .
Computer System Service Precautions 3F±5. . .
General Service Precautions 3F±5. . . . . . . . . . . .
Parts Handling 3F±5. . . . . . . . . . . . . . . . . . . . . . . .
FLASHING CODES 3F±6. . . . . . . . . . . . . . . . . . . .
CLEAR DTC 3F±7. . . . . . . . . . . . . . . . . . . . . . . . . .
INTERMITTENT CONDITIONS 3F±8. . . . . . . . .
BULB CHECK 3F±8. . . . . . . . . . . . . . . . . . . . . . . . .
DTC CHECK 3F±8. . . . . . . . . . . . . . . . . . . . . . . . . .
Connector List 3F±14. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC)
Identification 3F±16. . . . . . . . . . . . . . . . . . . . . . . . .
DTC2 Actuator Coil Over Current 3F±17. . . . . . . . . .
Circuit Description 3F±17. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±17. . . . . . . . . . . . . . . . . . . . . . . .
DTC3 Actuator Coil/Position Sensor Open
Circuit or Short 3F±19. . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3F±19. . . . . . . . . . . . . . . . . . . . . Diagnostic Aids 3F±19. . . . . . . . . . . . . . . . . . . . . . . .
DTC4 G-Sensor Open Circuit or Short 3F±22. . . . .
Circuit Description 3F±22. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±22. . . . . . . . . . . . . . . . . . . . . . . .
DTC5 Vehicle Speed Sensor Open Circuit
or Short 3F±23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3F±23. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±23. . . . . . . . . . . . . . . . . . . . . . . .
DTC6 Stop Lamp Switch Open Circuit
or Short 3F±25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3F±25. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±25. . . . . . . . . . . . . . . . . . . . . . . .
DTC7 Engine Speed Signal Open Circuit
or Short 3F±27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3F±27. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±27. . . . . . . . . . . . . . . . . . . . . . . .
DTC9 Control Unit Abnormality 3F±28. . . . . . . . . . . .
Control Unit 3F±32. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 3F±33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 3F±33. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Actuator 3F±34. . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 3F±35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 3F±35. . . . . . . . . . . . . . . . . . . .
Installation 3F±35. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Shock Absorber 3F±36. . . . . . . . . . . . . . . . . . . .
Removal 3F±37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 3F±37. . . . . . . . . . . . . . . . . . . .
Installation 3F±37. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

INTELLIGENT SUSPENSION3F±5
Vertical G-Sensor
Front G-sensors installed inside front actuators and the
rear G-sensor installed on the rear left frame side detect
the vehicle vertical gravity and send a signal to the Control
Unit.
Lateral G-Sensor
The G-sensor installed inside the Control Unit detects the
vehicle turning speed and sends a signal to the Control
Unit.
Acronyms and Abbreviations
Several acronyms and abbreviations are commonly used
throughout this section:
BATT
Battery
DLC
Data Link Connector
DTC
Diagnostic Trouble Code
FL
Front Left
FR
Front Right
GND
Ground
HARN
Harness
IG
Ignition
PCM
Powertrain Control Module
RL
Rear Left
RR
Rear Right
SW
Switch
W/L
Warning Lamp
Vout
Voltage output
General Diagnosis
General Information
Intelligent Suspension Control troubles can be classified
into two types, those which can be detected by the
warning lamp and those which can be detected as a
vehicle abnormality by the driver.
In either case, locate the fault in accordance with
theªBASIC DIAGNOSTIC FLOWCHARTº and repair.
Please refer to
Section 3 for the diagnosis of mechanical
troubles such as abnormal noise, vehicle pulls, excessive
tire wear, wheel hop and shimmy, shake or vibration.
Service Precautions
Required Tools and Items:

Box Wrench

Special Tool
Some diagnosis procedures in this section require the
installation of a special tool.
J-39200 High Impedance Multimeter
When circuit measurements are requested, use a
circuit tester with high impedance.
Computer System Service Precautions
The Intelligent Suspension Control interfaces directly
with the Control Unit which is a control computer that is
similar in some regards to the Powertrain Control Module.
These modules are designed to withstand normal current
draws associated with vehicle operation. However care
must be taken to avoid overloading any of the Control Unit
circuits. In testing for opens or shorts, do not ground or
apply voltage to any of the circuits unless instructed to do
so by the appropriate diagnostic procedure. These
circuits should only be tested with a high impedance
multimeter (J-39200) or special tools as described in this
section. Power should never be removed or applied to
any control module with the ignition in the ªONº
position.Before removing or connecting battery cables,
fuses or connectors, always turn the ignition switch to
theªOFFº position.
General Service Precautions
The following are general precautions which should be
observed when servicing and diagnosing the Intelligent
Suspension Control and/or other vehicle systems. Failure
to observe these precautions may result in Intelligent
Suspension Control damage.

If welding work is to be performed on the vehicle using
an electric arc welder, the Control Unit connectors
should be disconnected before the welding operation
begins.

The Control Unit connectors should never be
connected or disconnected with the ignitionªONº.
Parts Handling
Be careful when handling the actuator, control unit, or
G-sensor. They should not be dropped or thrown,
because the semi-conductor G-sensor tip damage may
result.

3F±6INTELLIGENT SUSPENSION
FLASHING CODES
1. ON BOARD DIAGNOSIS (SELF-DIAGNOSIS)
1. The Control Unit conducts a self-test of most of the
wiring and components in the system each time the
key is turned ON. If a fault is detected the Control
Unit will store a Diagnostic Trouble Code (DTC) in
memory. It's a number that corresponds to a
specific problem.
2. When the problem detected is important: the
warning lamp turns on until the fault is repaired and
the Control Unit memory is cleared.
2. DIAGNOSTIC TROUBLE CODES (DTC)
1. DTC can be expressed by flashing times of warning
lamp by shorting together terminals 3 and 4 or 5 of
the Diagnosis Connector (C-39) located left side of
instrument panel.
350R200002
Normal
F03RY00001
Abnormal
F03R200001
Legend
(1) Diagnostic Trouble Code 2
(2) Diagnostic Trouble Code 3

INTELLIGENT SUSPENSION3F±7
It depends below in the case that the code that also,
shows a malfunction place is added.
F03R200002
Legend
(1) Diagnostic Trouble Code 2
(2) Diagnostic Trouble Code 3 + Position Code 2
Position Code
1: Actuator Front RH, G-sensor Front RH
2: Actuator Front LH, G-sensor Front LH
3: Actuator Rear RH, G-sensor Rear
4: Actuator Rear LH, Lateral G-sensor
2. After this, the warning lamp will be OFF for 3.5
seconds and then will flash each DTC.
a. When there are more than 9 flashes this means
that the indicator is constantly flashing, OFF for
4 seconds ON for 0.5 seconds. In this case there
is no DTC stored in memory.
b. When there are less than 9 flashes you will see
DTC codes in ascending order.
CLEAR DTC
Remark: If you clear the DTC (Diagnosis Trouble Codes)
you will not be able to read any codes recorded during the
last Trouble.
Remark: To be able 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. Short the Diagnosis Connector C-39 terminal 3 to
terminal 4 or 5 (ground).

IF it is flashing and the flash is 0.5 seconds ON and 4
seconds OFF without interruption, this means that
there is no DTC. The DTCs are already cleared.
350R200002
2. IF a code is flashed, wait until the lamp is flashing.
3. Conduct brake switch ON/OFF 6 or more times on
condition that one operation is within 2 seconds.

3F±8INTELLIGENT SUSPENSION
INTERMITTENT CONDITIONS
If the Warning Lamp flashes a diagnostic trouble code as
intermittent, or if after a test drive a DTC does not
reappear though the detection conditions for this DTC are
present: the problem is most likely a faulty electrical
connection or loose wiring. Terminals and grounds should
always be the prime suspect. Intermittents rarely occur
inside sophisticated electronic components such as the
Control Unit.
Use the DTC information to understand which wires and
sensors are involved.
When an intermittent problem is encountered, check
suspect circuits for:
1. Poor terminal to wire connection.
2. Terminals not fully seated in the connector body
(backed out).
3. Improperly formed or damaged terminals.
4. Loose, dirty, or corroded ground connections:
HINT: Any time you have an intermittent in more than
one circuit, check whether the circuits share a
common ground connection.
5. Pinched or damaged wires.
6. Electro-Magnetic Interference (EMI):
HINT: Check that all wires are properly routed away
from spark plug wires, distributor wires, coil, and
generator. Also check for improperly installed
electrical options, such as lights, 2-way radios, etc.
BULB CHECK
When the starter switch is turned on in the normal state,
the Control Unit turns on the Warning Lamp to check the
bulb. After the engine starts, the Warning Lamp turns off.
F03RY00003
DTC CHECK
1. Diagnosis Trouble Codes (DTC) have been identified
by FLASHING CODES.
2. You have written the list of the DTC. The order of the
malfunctions has no meanings for this Control Unit.
Usually only one or two malfunctions should be set for
a given problem.
3. Check directly the DTCs you identified. The DTC are
sorted by number:
DIAGNOSTIC TROUBLE CODES.

3F±16INTELLIGENT SUSPENSION
Diagnostic Trouble Code (DTC)
Identification
DTC No.DTC NAMECODE
MEMORYWARNING
LAMP
2Actuator Coil Over CurrentYe sOFF
3Actuator Coil/Position Sensor Open Circuit or ShortYe sON
4G±Sensor Open Circuit or ShortYe sON
5Vehicle Speed Sensor Open Circuit or ShortYe sOFF
6Stop Lamp Switch Open Circuit, Short or Contact Point TroubleYe sOFF
7Engine Speed Signal Open Circuit or ShortYe sOFF
9Control Unit AbnormalityYe sOFF

INTELLIGENT SUSPENSION3F±17
DTC2 Actuator Coil Over Current
Circuit Description
The A, B, C, and D are the actuator motor coil terminals.
DC 12V driving voltage is applied between terminals A
and C and terminals B and D so that the shock absorber
oil valves are rotated at every 7.5
step feed.
Diagnostic Aids

Inspect the wiring for poor electrical connections
between the control unit 24 way connector and the
actuator connectors. Look for possible bent, backed
out, deformed, or damaged terminals. Check for
weak terminal tension as well.
Also check for a chafed wire that could short to bare
metal or other wiring. Inspect for a broken wire inside
the insulation.

When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
DTC2 Actuator Coil Over Current
StepActionValue(s)Ye sNo
11. Turn off the starter switch.
2. Disconnect the actuator connectors C±31, C±9,
F±8, and F±7.
3. Measure the resistance between the actuator side
connector C±9 terminals 1 and 2.
Is the resistance within the specified value?
6.4± 7.2
Go to Step 2Go to Step 3
21. Measure the resistance between the actuator side
connector C±9 terminals 3 and 4.
Is the resistance within the specified value?
6.4± 7.2
Go to Step 4Go to Step 3
3Replace the actuator FR.
ÐGo to Step 4Ð
41. Measure the resistance between the actuator side
connector C±31 terminals 1 and 2.
Is the resistance within the specified value?
6.4±7.2
Go to Step 5Go to Step 6
51. Measure the resistance between the actuator side
connector C±31 terminals 3 and 4.
Is the resistance within the specified value?
6.4±7.2
Go to Step 7Go to Step 6
6Replace the actuator FL.
ÐGo to Step 7Ð
71. Measure the resistance between the shock
absorber side connector F±7 terminals 3 and 4.
Is the resistance within the specified value?
6.4±7.2
Go to Step 8Go to Step 9
81. Measure the resistance between the shock
absorber side connector F±7 terminals 7 and 8.
Is the resistance within the specified value?
6.4±7.2
Go to Step 10Go to Step 9
9Replace the rear shock absorber RR.
ÐGo to Step 10Ð
101. Measure the resistance between the shock
absorber side connector F±8 terminals 3 and 4.
Is the resistance within the specified value?
6.4±7.2
Go to Step 11Go to Step 12
111. Measure the resistance between the shock
absorber side connector F±8 terminals 7 and 8.
Is the resistance within the specified value?
6.4±7.2
Go to Step 13Go to Step 12

3F±18INTELLIGENT SUSPENSION
DTC2 Actuator Coil Over Current (Cont'd)
StepNo Ye s Value(s) Action
12Replace the rear shock absorber RL.
ÐGo to Step 16Ð
13If all steps are correct, check the continuity between the
control unit connector C±46 terminal 1 and connector
terminal C46±4, C46±17, C46±5, C46±18, C46±6,
C46±19, C46±7, C46±20, C46±8, C46±21, C46±9,
C46±22, C46±10, C46±23, C46±11, and C46±24.
Is there continuity?
ÐGo to Step 15Go to Step 14
14Repair the circuit.
ÐGo to Step 16Ð
15Replace the control unit.
ÐGo to Step 16Ð
161. Reconnect all components, ensure all components
are properly mounted.
2. Clear the DTC.
Was this step finished?
Ð
Go to ªBasic
Diagnosis
Flowº.
Go to Step 16

INTELLIGENT SUSPENSION3F±19
DTC3 Actuator Coil/Position Sensor Open Circuit or Short
Circuit Description
The A, B, C, and D are the actuator motor coil terminals.
DC 12V driving voltage is applied between terminals A
and C and terminals B and D so that the shock absorber
oil valves are rotated at every 7.5
step feed.
The PSW is actuator position signal and detects relative
angles between the piston±rod and the control-rod. The
actuator outputs the PSW to the control unit.
Diagnostic Aids

Inspect the wiring for poor electrical connections
between the control unit 16 way connector and the
actuator connectors. Look for possible bent, backed
out, deformed, or damaged terminals. Check for
weak terminal tension as well.
Also check for a chafed wire that could short to bare
metal or other wiring. Inspect for a broken wire inside
the insulation.

When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
DTC3 Actuator Coil/Position Sensor Open Circuit or Short
StepActionValue(s)Ye sNo
11. Turn off the starter switch.
2. Disconnect the actuator connectors C±46, C±31,
C±9, F±8, and F±7.
Is there continuity between the connector C±9
terminals 1 and 2?
ÐGo to Step 2Go to Step 3
2Is there continuity between the connector C±9
terminals 3 and 4?
ÐGo to Step 4Go to Step 3
3Replace the actuator FR.
ÐGo to Step 4Ð
4Is there continuity between the connector C±31
terminals 1 and 2?
ÐGo to Step 5Go to Step 6
5Is there continuity between the connector C±31
terminals 3 and 4?
ÐGo to Step 7Go to Step 6
6Replace the actuator FL.
ÐGo to Step 7Ð
7Is there continuity between the connector F±7
terminals 3 and 4?
ÐGo to Step 8Go to Step 9
8Is there continuity between the connector F±7
terminals 7 and 8?
ÐGo to Step 10Go to Step 9
9Replace the rear shock absorber RR.
ÐGo to Step 10Ð
10Is there continuity between the connector F±8
terminals 3 and 4?
ÐGo to Step 11Go to Step 12
11Is there continuity between the connector F±8
terminals 7 and 8?
ÐGo to Step 13Ð
12Replace the rear shock absorber RL.
ÐGo to Step 13Ð
13Is there continuity between the connector C±9 terminal
1 and connector C±46 terminal 4?
ÐGo to Step 14Go to Step 15
14Is there continuity between the connector C±9 terminal
3 and connector C±46 terminal 17?
ÐGo to Step 16Go to Step 15
15Repair the circuit.
ÐGo to Step 16Ð