ISUZU AXIOM 2002 Service Repair Manual

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±26INTELLIGENT SUSPENSION
DTC6 Stop Lamp Switch Open Circuit or Short (Cont'd)
StepNo Ye s Value(s) Action
9Replace the brake switch.
Is the replacement complete?
ÐGo to Step 13Ð
101. Turn the ignition ªoffº.
2. Reconnect the control unit connector C±44
Turn the ignition ªonº.
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 11
11Check the control unit for faulty or intermittent
connections.
Was a problem found and corrected?
ÐGo to Step 13Go to Step 12
12Replace the control unit.
Is the replacement complete?
ÐGo to Step 13Ð
131. After the repair is complete, clear the DTC.
2. Conduct a test drive.
3. Review the DTC.
Has the last test failed or is the current DTC displayed?
Ð
Begin diagnosis
again
Go to
Step 1
Go to Repair
verified

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

3F±28INTELLIGENT SUSPENSION
DTC9 Control Unit Abnormality
Replace the control unit.
DTC9±1 Control Unit Blown Fuse for FR Actuator
StepActionValue(s)Ye sNo
11. Turn off the starter switch.
2. Disconnect the actuator connector C±9.
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 7Ð
41. If 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.
Is there continuity?
ÐGo 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±29
DTC9±2 Control Unit Blown Fuse for FL Actuator
StepActionValue(s)Ye sNo
11. Turn off the starter switch.
2. Disconnect the actuator connector C±31.
3. 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 2Go to Step 3
21. 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 4Go to Step 3
3Replace the actuator FL.
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±6, C46±19, C46±7,
C46±20.
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

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

3F±32INTELLIGENT SUSPENSION
Control Unit
Control Unit and Associated Parts
828R200001
Legend
(1) Front Console
(2) Connector(3) Control Unit
(4) Front

INTELLIGENT SUSPENSION3F±33
Removal
1. Disconnect the battery ground cable.
2. Remove the front console assembly.
Refer to
Consoles in Body and Accessories section.
3. Disconnect the connector from the control unit.
View A
828RY00002
Legend
(1) Nut
(2) Screw(3) Control Unit
(4) Bracket
4. Remove 4 nuts.
5. Disconnect the control unit with brackets.
6. Remove 4 screws.
7. Disconnect the control unit from brackets.
Installation
To install, follow the removal steps in the reverse order,
noting the following points.
Torque:
Nut (1) 8N´m (69 lb in)

3F±34INTELLIGENT SUSPENSION
Front Actuator
Front Actuator and Associated Parts
RH
450RY00004
Legend
(1) Connector
(2) Clip
(3) Actuator
(4) Shock Absorber
(5) Front
(6) Bracket
LH
450RY00003
Legend
(1) Connector
(2) Clip
(3) Actuator
(4) Shock Absorber
(5) Front
(6) Bracket