2002 ISUZU AXIOM air condition

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±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

INTELLIGENT SUSPENSION3F±23
DTC5 Vehicle Speed Sensor Open Circuit or Short
Circuit Description
Output speed information is provided to the control unit by
the vehicle speed sensor. The vehicle speed sensor
produces a pulsing AC voltage. The AC voltage level and
number of pulses increases as the speed of the vehicle
increases. The control unit then converts the pulsing
voltage to vehicle speed.
Diagnostic Aids

Inspect the wiring for poor electrical connections
between the control unit 48 way connector and the
speed sensor 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.
DTC5 Vehicle Speed Sensor Open Circuit or Short
StepActionValue(s)Ye sNo
11. Jack up and support the rear axle on the stand.
2. Change the transfer mode to 2WD, using TOD
switch on instrument panel.
3. Shift the transmission lever in a forward position
and rotate the rear wheels.
Does the speedo-meter operate?
ÐGo to Step 2Go to Step 3
21. Open the throttle and rev up engine speed.
2. Using a volt meter, measure the voltage between
the meter B connector I±23 terminals 7 and 16
(GND).
Does the voltage change alternately at the specified
values?
0V and 12VGo to Step 7Go to Step 5
31. Turn off the starter switch and disconnect the
control connectors C±46 and C±44.
2. Check the continuity between the vehicle speed
sensor connector terminal 3 and meter B connector
I±23 terminal 7.
Is there continuity?
ÐGo to Step 4Go to Step 6
41. Check the continuity between the control unit
connector C±46 terminal 1 and control unit
connector C±44 terminal 48.
Is there continuity?
ÐGo to Step 5Go to Step 6
5Repair or replace the vehicle speed sensor.
ÐGo to Step 8Ð
6Repair the circuit between the vehicle speed sensor
connector terminal 3 and the meter B connector I±23
terminal 7 or the circuit between the control unit
connector C±44 terminal 48 and the speed sensor
connector terminal 3.
ÐGo to Step 8Ð

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

INTELLIGENT SUSPENSION3F±27
DTC7 Engine Speed Signal Open Circuit or Short
Circuit Description
PCM (Powertrain Control Module) converts signals from
the crankshaft position sensor into the engine speed
signals (pulse) and sends these to the control unit and
tachometer.
Diagnostic Aids

Inspect the wiring for poor electrical connections at
the control unit connector. 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 harness routing for a potential short to ground
in circuit BLK/RED.
DTC7 Engine Speed Signal Open Circuit or Short
StepActionValue(s)Ye sNo
1NOTE: Confirm that DTC P0336 or P0337 does not
exist.
If either exists, warning lamps, ªCHECK ENGINEº and
ªCHECK TRANSº are turned on. Repair the engine,
referring to section 6E
Driveability and Emission.
1. Turn on the starter switch.
2. Start the engine.
3. Open the throttle and rev up engine speed.
Does the tachometer operate according to engine
speed?
ÐGo to Step 3Go to Step 2
2Repair the tachometer, referring to section 8D Wiring
System in Body and Accessories
.
ÐGo to Step 6Ð
31. Turn off the starter switch.
2. Check continuity between the control unit connector
C±44 terminal 59 and PCM connector E±34
terminal F7.
Is there continuity ?
ÐGo to Step 4Go to Step 5
4Replace the control unit.
ÐGo to Step 6Ð
5Repair the circuit.
ÐGo to Step 6Ð
61. Reconnect all components, ensure all components
are properly mounted.
2. Clear the DTC.
3. Conduct a test drive.
Has the last test failed or does the current DTC exist?
Ð
Begin diagnosis
again
Go to
Step 1
Repair
verified

DIFFERENTIAL (FRONT) 4A1±2
Front Drive Axle
Diagnosis
ConditionPossible causeCorrection
Oil Leak At Front AxleWorn or defective oil seal.Replace the oil seal.
Front axle housing cracked.Repair or replace.
Oil Leak At Pinion ShaftToo much gear oil.Correct the oil level.
Oil seal worn or defective.Replace the oil seal.
Pinion flange loose or damaged.Tighten or replace.
Noises In Front Axle Drive Shaft
JointBroken or worn drive shaft joints and
bellows (BJ and DOJ).Replace the drive shaft joints and
bellows.
ªClankº When Accelerating From
ªCoastºLoose drive shaft joint to output shaft
bolts.Tighten.
Damaged inner drive shaft joint.Replace.
Shudder or Vibration During
Acceleration
Excessive drive shaft joint angle.Repair.
AccelerationWorn or damaged drive shaft joints.Replace.
Sticking spider assembly (inner drive
shaft joint).Lubricate or replace.
Sticking joint assembly (outer drive
shaft joint).Lubricate or replace.
Vibration At Highway SpeedsOut of balance or out of round tires.Balance or replace.
Front end out of alignment.Align.
Noises in Front AxleInsufficient gear oil.Replenish the gear oil.
Wrong or poor grade gear oil.Replace the gear oil.
Drive pinion to ring gear backlash
incorrect.Adjust the backlash.
Worn or chipped ring gear, pinion
gear or side gear.Replace the ring gear, pinion gear or
side gear.
Pinion shaft bearing worn.Replace the pinion shaft bearing.
Wheel bearing worn.Replace the wheel bearing.
Differential bearing loose or worn.Tighten or replace.
Wanders and PullsWheel bearing preload too tight.Adjust the wheel bearing preload.
Incorrect front alignment.Adjust the front alignment.
Steering unit loose or worn.Tighten or replace.
Tire worn or improperly inflated.Adjust the inflation or replace.
Front or rear suspension parts loose
or broken.Tighten or replace.
Front Wheel ShimmyWheel bearing worn or improperly
adjusted.Adjust or replace.
Incorrect front alignment.Adjust the front alignment.
Worn ball joint or bush.Replace the ball joint or bush.
Steering unit loose or worn.Tighten or replace.
Tire worn or improperly inflated.Replace or adjust the inflation.
Shock absorber worn.Replace the shock absorber.

DIFFERENTIAL (FRONT) 4A1±4
3. Remove the front propeller shaft. Refer to Front
Propeller Shaft
in this section.
4. Remove flange nut by using pinion flange holder
J±8614±01.
415RS018
5. Remove flange.
6. Remove oil seal.
7. Remove outer bearing by using remover J±39602.
415RS001
8. Remove collapsible spacer.
Inspection and Repair
Make necessary correction or parts replacement if wear,
damage, corrosion or any other abnormal condition are
found through inspection.
Check the following parts.
1. Seal surface of the pinion.
2. Cage bore for burns.
Installation
1. Install collapsible spacer. Discard the used
collapsible spacer and install a new one.
2. Install outer bearing.
NOTE: Do not drive in, but just temporarily set in the outer
bearing by hand, which should be indirectly pressed in
finally by tightening the flange nut.
3. Install oil seal, use oil seal installer J±24250 to install a
new oil seal that has been soaked in axle lubricant.
415RS002
4. Install flange.
5. Install flange nut, refer to
Differential Assembly
Overhaul for flange nut reassembly
in this section.
NOTE: Discard the used nut and install a new one.

4A1±21 DIFFERENTIAL (FRONT)
4. Remove the cross pin, using a soft metal rod and a
hammer.
425RS043
5. Remove pinion gear.
6. Remove side gear.
7. Remove thrust washer.
Inspection and Repair
Make necessary correction or parts replacement if wear,
damage, corrosion or any other abnormal condition are
found through inspection.
Check the following parts.
1. Ring gear, pinion gear
2. Bearing
3. Side gear, pinion gear, cross pin
4. Differential cage, carrier
5. Thrust washer
6. Oil seal
Ring gear replacement:
1. The ring gear should always be replaced with the
drive pinion as a set.
2. Discard used bolts and install new ones.
Torque: 108 N´m (80 lb ft)3. Tighten the fixing bolts in a diagonal sequence as
illustrated.
415RS016
Reassembly
1. Install thrust washer.
2. Install side gear.
3. Install the pinion gear with thrust washer by engaging
it with the side gears while turning both pinion gears
simultaneously in the same direction.
425RS048