2002 ISUZU AXIOM ABS

3F±4INTELLIGENT SUSPENSION
PIN ASSIGNMENT TABLE
PIN
No.NAMEPIN
No.NAMEPIN
No.NAMEPIN
No.NAME
1GND17KI-FR B33KI-RR PSW49STOP
2NC18KI-FR D34KI-RL Vcc50T-SW
3Vdd19KI-FL B35KI-FR GND51M-SW
4KI-FR A20KI-FL D36KI-FR Vs52Txd
5KI-FR C21KI-RR B37KI-FL PSW53Vig
6KI-FL A22KI-RR D38KI-FL Vs54NC
7KI-FL C23KI-RL B39KI-FL GND55G3 GND
8KI-RR A24KI-RL D40KI-RR GND56G3 Vs
9KI-RR C25Vig41KI-RL PSW57NC
10KI-RL A26GND42KI-RL GND58NC
11KI-RL C27KI-FR Vcc43M.L59E/G
12Vbat28KI-FR Vout44G3 Vcc60W. L
13GND29KI-FR PSW45G3 Vout61GND
14GND30KI-FL Vout46NC62GND
15NC31KI-FL Vcc47NC63Rxd
16Vdd32KI-RR Vcc48VSP64GND
NC: NO CONNECTION
System Components
Control Unit, 3 Vertical G-sensors, Lateral G-sensor, 4
Actuators, 4 Adjustable Damping Force Shock
Absorbers, and Warning Lamp.
Control Unit
The Control Unit consists of Adjustable Damping Force
Shock Absorber control circuits, fault detector, and a
fail-safe. It drives the actuator according to the signal
from each sensor.
The Control Unit has a self-diagnosing function which can
indicate faulty circuits during diagnosis.
The Control Unit is mounted in the center of the
instrument panel.
Actuator
Front actuators installed on front shock absorbers and
rear actuator installed inside rear shock absorbers control
damping force of shock absorber by the Control Unit
signal.
Adjustable Damping Force Shock
Absorber
This type shock absorber is used in front and rear
intelligent suspension. According to running condition the
Control Unit changes shock absorber damping force and
obtains good running stability.
Warning Lamp
821R200011Vehicles equipped with the Intelligent Suspension Control
have an amber warning lamp in the instrument panel. The
warning lamp will illuminate if a malfunction in the
Intelligent Suspension Control is detected by the Control
Unit. In case of an important electronic malfunction, the
Control Unit will turnªONº the warning lamp.

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

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

INTELLIGENT SUSPENSION3F±25
DTC6 Stop Lamp Switch Open Circuit or Short
Circuit Description
The brake switch is used to indicate brake pedal status.
The normally opened brake switch signal voltage circuit is
opened.
Brake switch supplies a B+ signal on circuit RED to the
control unit when the brakes are applied. The control unit
uses this signal to work dive control when the brakes are
applied.
Diagnostic Aids

Inspect the wiring for poor electrical connections at
the control unit and brake switch. 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.

Check customer driving habits and/or unusual driving
conditions (i.e. stop and go, highway).

Check brake switch for proper mounting and
adjustment.
DTC6 Stop Lamp Switch Open Circuit or Short
StepActionValue(s)Ye sNo
11. With the engine ªoffº, turn the ignition switch ªonº. If
ABS code is set, check applicable fuse.
2. Apply then release the brake pedal.
Does the brake lamp come on when the brake pedal is
applied and does it come off when the brake pedal is
released?
Ð
Go to
Diagnostic
Aids
Go to Step 2
21. Connect the test light to ground.
2. Back probe ignition feed circuit terminal I±31
terminal 1 at the brake switch.
Is the test light ªonº?
ÐGo to Step 3Go to Step 4
31. Connect the test light to ground.
2. Back probe circuit terminal I±31 terminal 4 at the
brake switch.
Is the test light ªoffº?
ÐGo to Step 7Go to Step 5
4Repair the open in battery feed circuit terminal I±31
terminal 1 to the brake switch.
If fuse is open, check circuit terminal I±31 terminal 4 for
a short to ground.
Is the replacement complete?
ÐGo to Step 13Ð
5Disconnect brake switch connector I±31 and ignition
switch ªonº.
Is the test light ªonº?
ÐGo to Step 8Go to Step 6
6Check the brake switch short (I±31 terminal 1 and I±31
terminal 4).
Was a problem found?
ÐGo to Step 9Go to Step 10
7Check circuit terminal I±31 terminal 4 for a short to
voltage.
Ignition switch ªonº.
Is the test light ªonº?
ÐGo to Step 8Go to Step 10
81. Disconnect the control unit connector C±44.
2. Check circuit terminal I±31 terminal 4 for a short to
voltage.
Was a problem found?
ÐGo to Step 13Go to Step 10

3F±30INTELLIGENT SUSPENSION
DTC9±3 Control Unit Blown Fuse for RR Shock Absorber
StepActionValue(s)Ye sNo
11. Turn off the starter switch.
2. Disconnect the shock absorber connector F±7.
3. 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 2Go to Step 3
21. 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 4Go to Step 3
3Replace the shock absorber RR.
ÐGo to Step 7Ð
41. If all steps are correct, check the continuity between
the control unit connector C±46 terminal 1 and
connector-terminal C46±8, C46±21, C46±9,
C46±22.
Is there continuity?
Ð
Begin diagnosis
again
Go to
Step 5Go to Step 6
5Repair the circuit.
ÐGo to Step 7Ð
6Replace the 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
FLowº.
Go to Step 7

INTELLIGENT SUSPENSION3F±31
DTC9±4 Control Unit Blown Fuse for RL Shock Absorber
StepActionValue(s)Ye sNo
11. Turn off the starter switch.
2. Disconnect the shock absorber connector F±8.
3. 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 2Go to Step 3
21. 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 4Go to Step 3
3Replace the shock absorber RL.
ÐGo to Step 7Ð
41. If all steps are correct, check the continuity between
the control unit connector C±46 terminal 1 and
connector-terminal C46±10, C46±23, C46±11,
C46±24.
Is there continuity?
Ð
Begin diagnosis
again
Go to
Step 5Go to Step 6
5Repair the circuit.
ÐGo to Step 7Ð
6Replace the 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
FLowº.
Go to Step 7