tire pressure ISUZU AXIOM 2002 Service Service Manual

6E±341
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0456 EVAP Very Small Leak
060R200050
Circuit Description
The evaporative system includes the following
components:

Fuel tank

EVAP canister vent solenoid

Fuel tank (vapor) pressure sensor

Vapor lines

Fuel cap

Evaporative emissions canister

Purge lines

EVAP canister purge solenoid
The evaporative leak detection diagnostic strategy is
based on applying vacuum to the EVAP system and
monitoring vacuum decay. The powertrain control
module(PCM)monitors vacuum level via the fuel tank
pressure sensor input. At an appropriate time, the
EVAP canister purge solenoid and the EVAP
canister vent solenoid are turned ªONº, allowing
engine vacuum to draw a very small look on the
entire evaporative emissions system. After the
desired vacuum level has been achieved, the EVAP
canister purge solenoid is turned ªOFFº, sealing the
system. A leak is detected by monitoring for a
decrease in vacuum level over a given time period,
all other variables remaining constant.
A very small leak in the system will cause DTC
P0456 to be set.
Conditions for setting the DTC

No MAP DTC's set.

No TPS DTC's set.

No IAT DTC's set.

No ECT DTC's set.

No tank pressure sensor DTC's set.

Baro is more than 70KPa.

Fuel level is between 40% and 80%.

Throttle angle is less than 3%.

Engine speed is less than 1200 RPM.

Vehicle speed is less than 5 mph (8 km/h).

A vacuum decay condition, indicating a very small leak,
is detected during the diagnostic test.
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.

The PCM will store condition which were present when
the DTC was set as Freeze Frame and in the Failure
Records data.
Warm up cycles have occurred without a fault.
Conditions for Clearing the MIL/DTC

The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

6E±462
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1311 ION Sensing Module SEC Line 1 Circuit Fault
060R200068
Circuit Description

The Power Control Module (PCM) will compare the
secondary current reading to predetermined maximum
and minimum thresholds.
If the secondary current signal pulse width is out of
the predetermined range, the fail counter will be
incremented. If the failure counter exceeds the
calibration, then the PCM is complete and a failure
will be reported. If the sample counter threshold is
reached before the failure threshold, then the PCM is
complete and pass will be reported.
This PCM will detect an open/short circuit in the
secondary current sense input circuit, misfire on the
entire bank for the secondary current sense input
circuit, coil failure, and same internal Ignition Current
Sense System (ICSS) module faults.
Conditions for setting the DTC

Ignition voltage is between 10volt and 16 volts.

MAP sensor signal is between 26kPa and 100 kPa.

Fuel level is more than 19%.

Engine speed is between 650rpm and 6500rpm.

ION Sensing Module circuit is open or shorted signals
on the SEC 1 line.
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.

The PCM calculates an air flow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.

The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC

The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

A history DTC P1311 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

DTC P1311 can be cleared using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An intermittent may be caused by the following:

Poor connections.

Misrouted harness.

Rubbed through wire insulation.

Broken wire inside the insulation.
Check for the following conditions:

6E±465
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1312 ION Sensing Module SEC Line 2 Circuit Fault
060R200068
Circuit Description

The Power Control Module (PCM) will compare the
secondary current reading to predetermined maximum
and minimum thresholds.
If the secondary current signal pulse width is out of
the predetermined range, the fail counter will be
incremented. If the fail counter exceeds the
calibration, then the PCM is complete and a failure
will be reported. If the sample counter threshold is
reached before the failure threshold, then the PCM is
complete and pass will be reported.
This PCM will detect an open/short circuit in the
secondary current sense input circuit, misfire on the
entire bank for the secondary current sense input
circuit, coil failure, and same internal Ignition Current
Sense System (ICSS) module faults.
Conditions for setting the DTC

Ignition voltage is between 10volt and 16 volts.

MAP sensor signal is between 26kPa and 100 kPa.

Fuel level is more than 19%.

Engine speed is between 650rpm and 6500rpm.

ION Sensing Module circuit is open or shorted signals
on the SEC 2 line.
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.

The PCM calculates an air flow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.

The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC

The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

A history DTC P1312 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

DTC P1312 can be cleared using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An intermittent may be caused by the following:

Poor connections.

Misrouted harness.

Rubbed through wire insulation.

Broken wire inside the insulation.
Check for the following conditions:

6E±520
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Poor Fuel Economy Symptom

StepActionValue(s)Ye sNo
1DEFINITION:
Fuel economy, as measured by an actual road test, is
noticeably lower than expected. Also, economy is
noticeably lower than it was on this vehicle at one time,
as previously shown by an actual road test.
(Non-standard tires will cause odometer readings to be
incorrect, and that may cause fuel economy to appear
poor when it is actually normal.)
Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
ÐVerify repairGo to Step 3
3Was a visual/physical check performed?
ÐGo to Step 4
Go to Visual/
Physical
Check
4Check owner's driving habits.

Is the A/C ªONº full time (defroster mode ªONº)?

Are tires at the correct pressure?

Are excessively heavy loads being carried?

Is acceleration too much, too often?
Was a problem found?
ÐGo to Step 5Go to Step 6
5Review the items in Step 4 with the customer and
advise as necessary.
Is the action complete?
ÐSystem OKÐ
61. Visually/physically check: Vacuum hoses for splits,
kinks, and improper connections and routing as
shown on the ªVehicle Emission Control
Informationº label.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 7
71. Remove and check the air filter element for dirt or for
restrictions. Refer to
Air Intake System.
2. Replace the air filter element if necessary.
Was a repair required?
ÐVerify repairGo to Step 8
81. Remove spark plugs and check for wet plugs,
cracks, wear, improper gap, burned electrodes, or
heavy deposits. Refer to
Spark Plug Replacement.
NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 9
91. Check for low engine coolant level. Refer to Engine
Cooling
.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 10

6E±587
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
055RW004
Non-Electrical Components

Purge/Vacuum Hoses. Made of rubber compounds,
these hoses route the gasoline fumes from their
sources to the canister and from the canister to the
intake air flow.

EVAP Canister. Mounted on a bracket ahead of the
fuel tank, the canister stores fuel vapors until the PCM
determines that engine conditions are right for them
to be removed and burned.

Fuel Tank. The tank has a built-in air space designed
for the collection of gasoline fumes.
060R200081

Vacuum Source. The vacuum source is split between
two ports, one on either side of the throttle body.

Fuel Cap. The fuel cap is designed to be an integral
part of the EVAP system.System Fault Detection
The EVAP leak detection strategy is based on applying
vacuum to the EVAP system and monitoring vacuum
decay. The PCM monitors vacuum level via the fuel tank
pressure sensor. At an appropriate time, the EVAP purge
solenoid and the EVAP vent solenoid are turned ªON,º
allowing the engine vacuum to draw a small vacuum on
the entire evaporative emission system.
After the desired vacuum level has been achieved, the
EVAP purge solenoid is turned ªOFF,º sealing the system.
A leak is detected by monitoring for a decrease in vacuum
level over a given time period, all other variables
remaining constant. A small leak in the system will cause
DTC P0442 to be set.
If the desired vacuum level cannot be achieved in the test
described above, a large leak or a faulty EVAP purge
solenoid is indicated.
Leaks can be caused by the following conditions:

Disconnected or faulty fuel tank pressure sensor

Missing or faulty fuel cap

Disconnected, damaged, pinched, or blocked EVAP
purge line

Disconnected or damaged EVAP vent hose

Disconnected, damaged, pinched, or blocked fuel
tank vapor line

Disconnected or faulty EVAP purge solenoid

Disconnected or faulty EVAP vent solenoid

Open ignition feed circuit to the EVAP vent or purge
solenoid

Damaged EVAP canister

Leaking fuel sender assembly O-ring

Leaking fuel tank or fuel filler neck
A restricted or blocked EVAP vent path is detected by
drawing vacuum into the EVAP system, turning ªOFFº the
EVAP vent solenoid and the EVAP purge solenoid (EVAP
vent solenoid ªOPEN,º EVAP purge Pulse Width
Modulate (PWM) ª0%º) and monitoring the fuel tank
vacuum sensor input. With the EVAP vent solenoid open,
any vacuum in the system should decrease quickly
unless the vent path is blocked. A blockage like this will
set DTC P0446 and can be caused by the following
conditions:

Faulty EVAP vent solenoid (stuck closed)

Plugged, kinked or pinched vent hose

Shorted EVAP vent solenoid driver circuit

Plugged EVAP canister
The PCM supplies a ground to energize the purge
solenoid (purge ªONº). The EVAP purge control is PWM,
or turned ªONº and ªOFF,º several times a second. The
duty cycle (pulse width) is determined by engine
operating conditions including load, throttle position,
coolant temperature and ambient temperature. The duty
cycle is calculated by the PCM and the output is
commanded when the appropriate conditions have been
met.

7A1±54
TRANSMISSION CONTROL SYSTEM (4L30±E)

The PCM will illuminate the CHECK TRANS Lamp.

Turn force motor OFF.
Conditions For Clearing The DTC/CHECK
TRANS Lamp

The PCM will turn ªoffº the CHECK TRANS Lamp
after three consecutive ignition cycles without a
failure reported.

The DTC can be cleared from PCM memory by using
a scan tool.

The DTC can also be cleared from memory when the
vehicle has made 40 warmup cycles without a failure
reported.

The PCM will cancel the DTC Actions Taken items
when the fault conditions no longer exist and the
ignition is cycles ªoffº long enough to power down the
PCM.
Diagnostic Aids

Check for intermittent output speed sensor circuit
problems.

Check for possible incorrect calibration. (PCM part
No., tire specification, and rear axle ratio)
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
3. This step checks for possible low fluid level causing
slipping resulting in an undefined gear ratio.
4. This step checks for correct gear ratios for
commanded gears.
5. This step checks for low line pressure.
DTC P0730 Gear Error Without Input Speed
StepActionYe sNo
1Were you sent here from the ªOn±Board Diagnostic (OBD)
System Checkº?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emission in
Engine section
2Visually inspect the transmission cooling system for fluid leaks.

Refer to
Chart 16: Possible Causes of Transmission Fluid
Leaks of Mechanical/Hydraulic Diagnosis Symptoms Index in
Automatic Transmission (4L30±E) section
Was condition found and corrected?Go to Step 7Go to Step 3
3Refer to Checking Transmission Fluid Level and Condition in
Automatic Transmission (4L30±E) section.
Has transmission fluid checking procedure been performed?
Go to Step 4
Go to Checking
Transmission
Fluid Level and
Condition in
Automatic
Transmission
(4L30±E) section
41. Install the scan tool.
2. Turn the ignition switch to the ªonº position.
3. Engine not running.
NOTE: Before clearing DTC(s) use the scan tool to record the
ªFailure Recordsº for reference, as data will be lost when the ªClear
Infoº function is used.
4. Record the Failure Record data.
5. Use the scan tool snapshot mode to record transmission gear
ratios.
6. Drive vehicle in transmission gear ranges L, 2, 3, and D with
the engine speed is greater than 3,500 rpm for 5.5 seconds.
7. Record each transmission gear.
1st:2.73 ± 2.99
2nd:1.54 ± 1.71
3rd:0.93 ± 1.05
4th:0.66 ± 0.78
Does commanded gear ratio match ranges as shown?
Refer to
Diagnostic AidsGo to Step 5

8A±4LIGHTING SYSTEM
Headlight Assembly
Removal
1. Disconnect the battery ground cable.
2. Remove the front combination light (2).

Remove the screw.

Disconnect the connector.
3. Remove the headlight assembly (1).

Disconnect the connector.

Remove four screws.
801R200022
Installation
To install, follow the removal steps in the reverse order.
noting the following point:
1. After installing the headlight, be sure to adjust the
headlight aim.
Headlight Adjustment
Preparation
Place the vehicle with 1 person in driver seat on a level
surface and check to see if the inflation pressure of the
tires is correct, the lenses are clean, the battery is
sufficiently charged, and adjust to place vehicle by using
the screen.1. Set a vertical screen on a level surface.
2. Toward the screen (1) from the bulb center mark of
the headlight, extend parallel lines to the floor. Mark
point (A) and (B) on the screen at the intersection of
parallel line and the screen.
3. Draw vertical lines through point (A) and (B) on the
screen.
801R200019
4. Keep the vehicle (2) 3m (9.8 ft) apart from the screen
(1).
5. Draw a horizontal line through point (A) and (B) on the
screen (1).
801R200009