2002 ISUZU AXIOM sensor

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.

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±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

3F±20INTELLIGENT SUSPENSION
DTC3 Actuator Coil/Position Sensor Open Circuit or Short (Cont'd)
StepNo Ye s Value(s) Action
16Is there continuity between the connector C±9 terminal
2 and connector C±46 terminal 5?
ÐGo to Step 17Go to Step 18
17Is there continuity between the connector C±9
terminals 4 and connector C±46 terminal 18?
ÐGo to Step 19Go to Step 18
18Repair the circuit.
ÐGo to Step 19Ð
19Is there continuity between the connector C±31
terminal 1 and connector C±46 terminal 6?
ÐGo to Step 20Go to Step 21
20Is there continuity between the connector C±31
terminal 3 and connector C±46 terminal 19?
ÐGo to Step 22Go to Step 21
21Repair the circuit.
ÐGo to Step 22Ð
22Is there continuity between the connector C±31
terminal 2 and connector C±46 terminal 7?
ÐGo to Step 23Go to Step 24
23Is there continuity between the connector C±31
terminal 4 and connector C±46 terminal 20?
ÐGo to Step 25Go to Step 24
24Repair the circuit.
ÐGo to Step 25Ð
25Is there continuity between the connector F±7 terminal
4 and connector C±46 terminal 8?
ÐGo to Step 26Go to Step 27
26Is there continuity between the connector F±7 terminal
8 and connector C±46 terminal 21?
ÐGo to Step 28Go to Step 27
27Repair the circuit.
ÐGo to Step 28Ð
28Is there continuity between the connector F±7 terminal
3 and connector C±46 terminal 9?
ÐGo to Step 29Go to Step 30
29Is there continuity between the connector F±7 terminal
7 and connector C±46 terminal 22?
ÐGo to Step 31Go to Step 30
30Repair the circuit.
ÐGo to Step 31Ð
31Is there continuity between the connector F±8 terminal
4 and connector C±46 terminal 10?
ÐGo to Step 32Go to Step 33
32Is there continuity between the connector F±8 terminal
8 and connector C±46 terminal 23?
ÐGo to Step 34Go to Step 33
33Repair the circuit.
ÐGo to Step 34Ð
34Is there continuity between the connector F±8 terminal
3 and connector C±46 terminal 11?
ÐGo to Step 35Go to Step 36
35Is there continuity between the connector F±8 terminal
7 and connector C±46 terminal 24?
ÐGo to Step 37Go to Step 36
36Repair the circuit.
ÐGo to Step 37Ð
371. Disconnect the terminals C±45, C±8, C±30, F±7,
and F±8.
Is there continuity between the connector±terminal
C45±29 and C8±6, C45±37 and C30±6, C45±33 and
F7±2, C45±41 and F8±2?
ÐGo to Step 38Go to Step 41

INTELLIGENT SUSPENSION3F±21
DTC3 Actuator Coil/Position Sensor Open Circuit or Short (Cont'd)
StepNo Ye s Value(s) Action
38Is there continuity between the connector C±46
terminal 1 (GND) and the connector C±45 terminals 29,
33, 37, and 41?
ÐGo to Step 41Go to Step 39
39Is there the continuity between connector-terminal
C45±27 and C45±35, C45±31 and C45±39, C45±32
and C45±40, and C45±34 and C45±42?
ÐGo to Step 41Go to Step 40
40Is there the continuity between connector C±46
terminal 1 and connector C±45 terminals 27, 31, 32,
and 34?
ÐGo to Step 41Go to Step 42
41Repair the circuit.
ÐGo to Step 44Ð
421. If all steps are correct, replace following units one by
one in the following order. Give a test drive and if
normal, reinstall it.
1) actuator FR, 2) actuator FL, rear shock
absorber, 3) RR and 4) RL.
Does the DTC3 remain?
ÐGo to Step 43Go to Step 44
43Replace the control unit.
ÐGo to Step 44Ð
441. 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 44

3F±22INTELLIGENT SUSPENSION
DTC4 G-Sensor Open Circuit or Short
Circuit Description
The G-sensor sends the voltage (Vout) corresponding to
the vehicle vertical gravity to the control unit.
The control unit supplies DC 5V power (Vcc) to each
G-sensor.
The control unit watches the G-sensor operation through
Vcc signal.
Diagnostic Aids

Inspect the wiring for poor electrical connections
between the control unit connectors 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.
DTC4 G-Sensor Open Circuit or Short
StepActionValue(s)Ye sNo
11. Turn off the starter switch.
2. Disconnect the connectors C±45, C±44, C±8,
C±30, and F±6.
Is there the continuity between the connector-terminal
C45±28 and C8±5, C45±30 and C30±5, and C44±45
and F6±1?
ÐGo to Step 2Go to Step 5
2Is there continuity between the connector-terminal
C45±27 and C8±3, C45±31 and C30±3, and C44±44
and F6±2?
ÐGo to Step 3Go to Step 5
3Is there the continuity between the connector-terminal
C45±36 and C8±2, C45±38 and C30±2, and C44±56
and F6±3?
ÐGo to Step 4Go to Step 5
41. Disconnect the connectors C±46, C±45, and C±44.
Is there the continuity between the connector-terminal
C45±28 and C45±35, C45±30 and C45±39, C44±45
and C44±55, C45±27 and C45±35, C45±31 and
C45±39, C44±44 and C44±55, C45±36 and C45±35,
C45±38 and C45±39, and C44±56 and C44±55?
ÐGo to Step 5Go to Step 7
5Repair the circuit.
ÐGo to Step 6Ð
6Replace following units one by one in the following
order. Give a test drive and if normal, reinstall it.
1) G3-sensor 2) Actuator FL 3) Actuator FR 4)
Control Unit
ÐGo to Step 7Ð
71. Reconnect all components, ensure all components
are properly mounted.
2. Clear the DTC.
Was this step finished?
Ð
Go to ªBasic
Diagnosis
Flow.º
Go to Step 7