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Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1473

6E2–343

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code(DTC)P0456 EVAP Very Small Leak

Step

Action

Value(s)

Yes

Was the “On-Board(OBD)System Check” performed?

—

Go to

Step 2

Go to

OBD

System

Check

1. Ignition “OFF”.
2. Remove the fuel cap.
3. Ignition “ON”.
4. Observe “Fuel Tank Pressure” on the Tech 2.

Does the Tech 2 indicate “Fuel Tank Pressure” at the
specified value?

1.51V

Go to

Step 3

Go to

Fuel

Tank

Pressure

System

1. Visually/physically check for the following

conditions:

Vent hose disconnected or damaged.

EVAP canister damaged.

Fuel cap damaged

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 4

1. Ignition “ON”, engine “OFF”.
2. Install the fuel cap.
3. Review and record Tech 2 Failure Records data.
4. Operate the vehicle within Failure Records

conditions as noted.

5. Using theTech 2,monitor the “DTC” info for DTC

P0456.

Does the Tech 2 indicate DTC P0456?

—

Go to

Step 5

Refer to

Diagnostic

Aids

1. Ignition “ON”, engine idling.
2. Observe “Fuel Tank Pressure” on the Tech 2.

Does the Tech 2 indicate “Fuel Tank Pressure” at the
specified value?

—

Refer to

Diagnostic

Aids

Go to

Step 6

1. Ignition “ON”, engine idling.
2. Using theTech 2, command the EVAP canister vent

solenoid “ON” (closed)

3. Observe “EVAP canister vent solenoid operation”

second value?

4. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to

Step 7

1. Visually/physically check for the following

conditions:

Disconnected or leaking fuel tank vapor line.

Disconnected or damaged EVAP purge line.

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Refer to

Diagnostic

Aids

6E2–344

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0461 Fuel Level Sensor Performance

060RY00163

Circuit Description

Conditions for Setting the DTC

Sensor output change is more than 2% within 200km.
Or Sensor movement position change is less than
15% within 200km.

IAT is more than 0

MAP changing in 3 sec is less than 10kPa.

Engine speed changing in 3 sec is less than 50rpm.

When there are 12 test failures within 80 test samples, it is
stored.

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 conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.

Conditions for Clearing the DTC

DTC P0461 can be cleared by using the scan tool
“Clear Info” function or by disconnecting the PCM
battery feed.

Diagnostic Aids

Damaged harness–Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
fuel level display on the scan tool while moving
connectors and wiring harnesses related to the sensor.
A change in the display will indicate the location of the
fault.

6E2–345

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

DTC P0461– Fuel Level Sensor Performance

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to

Step 2

Go to

OBD

System

Check

1. Ignition “Off”, Engine “Off”.
2. Install Tech 2.
3. Ignition “On”, Engine “Off”.
4. Check DTC P0462, P0463.

Was the DTC stored?

—

Go to

applicable
DTC table

Go to

Step 3

Check DTC P0464.

Was the DTC stored?

—

Go to

DTC

P464 table

Go to

Step 4

1. Ignition “Off”, Engine “Off”.
2. Replace the fuel level sensor.

Was the action complete?

—

Verify repair

—

6E2–346

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC)

P0462 Fuel Level Sensor Circuit–Low Voltage

060RY00163

Circuit Description

The fuel level sensor is an important input to powertrain
control module (PCM) for the enhanced evaporative
system diagnostic. Fuel level information is needed for
the PCM to know the volume of fuel in the tank. The fuel
level affects the rate of change in air pressure in the
evaporative system. Several of the enhanced
evaporative system diagnostic sub-tests are dependent
upon correct fuel level information. The diagnostic will not
run when the tank is more than 85% or less than 15% full.
Fuel level DTCs should be diagnosed before other
evaporative system DTCs because they can cause other
DTCs to be set.
The sending unit is a float in the fuel tank which moves a
wiper arm across a variable resistor. Low fuel level
causes high resistance in the sending unit, and this is
recognized by the PCM because the circuit operates at a
corresponding low voltage. When the circuit is
continuously open or has a high resistance connection,
DTC P0462 is set.

Conditions for Setting the DTC

Fuel tank level “slosh test” is completed.

Fuel tank level “main test” is completed.

Fuel tank level data is valid.

Fuel tank level signal is less than a specified value.

There are 100 test failures within a 200-test sample.

Action Taken When the DTC Sets

The PCM will ON the MIL after second trip with
detected the fault.

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 DTC

The PCM will turn the MIL “OFF” after three
consecutive trips without a fault condition present. A
history DTC will be cleared if no fault conditions have
been detected for 40 warm-up cycles (engine coolant
temperature has risen 4

C (40

F) from the start-up

ECT, and ECT exceeds 71

C (160

F) during that

same ignition cycle).

DTC P0462 can be cleared by using the scan tool
“Clear Info” function or by disconnecting the PCM
battery feed.

Diagnostic Aids

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