Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1475

6E2–351

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0462 Fuel Level Sensor Noisy Signal

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.
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 P0464 is set.

Conditions for Setting the DTC

D

Sensor output changing is more than 15%.

D

Fuel volume level is more than 0.01%.

D

IAT is more than 0

°

C.

D

Vehicle speed is more than 1km/h.

D

Throttle position is more than 2%.

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

Action Taken When the DTC Sets

D

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

D

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

D

DTC P0464 can be cleared by using the scan tool
“Clear Info” function or by disconnecting the PCM
battery feed.

Diagnostic Aids

D

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.

6E2–352

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

DTC P0464 – Fuel Level Sensor Noisy Signal

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to 

Step 2

Go to 

OBD

System

Check

2

1. Ignition “Off”, Engine “Off”.
2. Perform “Visual/Physical Check” for following

points. 

D

Lose harness connector

D

Clacked harness connector

D

Poor wire condition

D

Fuel tank condition

D

Poor sensor condition

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

Was a problem found?

—

Verify repair

Go to 

Step 3

3

1. Disassemble fuel tank on the vehicle.
2. Check the below items.

D

Fuel sender

Was a problem found?

—

Go to 

Step 4

Go to 

Step 5

4

Replace the Fuel sender.

Was the action complete?

—

Verify repair

Go to 

Step 5

5

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed.  Refer to 

On-Vehicle Service in

Powertrain Control Module and Sensors for
procedures.

And also refer to latest Service Bulletin.

Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.

Was the action completed?

—

Verify repair

— 

6E2–353

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P0502 VSS Circuit Low Input

060R200056

Circuit Description

The vehicle speed sensor has a magnet rotated by the
transmission output shaft.  Attached to the sensor is a hall
effect circuit the interacts with the magnetic field treated
by the rotating magnet.  A 12-volt operating supply for the
speed sensor hall circuit is supplied from the meter fuse.
The VSS pulses to ground the 9-volt signal sent from the
powertrain control module (PCM) on the reference circuit.
The PCM interprets vehicle speed by the number of
pulses to ground per second on the reference circuit.

Conditions for Setting the DTC

D

Engine is running.

D

Engine speed is between 1800 RPM and 2500 RPM.

D

Throttle angle is between 10% and 40%.

D

Engine load is greater than 50 kPa.

D

PCM detects no VSS signal for 12.5 seconds over a
period of 15 seconds.

Action Taken When the DTC Sets

D

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

D

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

D

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

D

A history DTC P0502 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

D

DTC P0502 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.
10. To avoid backprobing the VSS and possibly

damaging a seal or terminal, the VSS output can be
tested at the point where the transmission harness
connects to the engine harness.  Power and ground
are applied by jumpers to the VSS through the
connectors which are located to the rear of the air
cleaner assembly.  The VSS signal is monitored
with a DVM as the rear driveshaft turns.  The
wheels can be turned to rotate the driveshaft, or in
2-wheels-drive vehicles the driveshaft can be turned
directly.

6E2–354

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

DTC P0502 – VSS Circuit Low Input

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to 

Step 2

Go to 

OBD

System

Check

2

Does the speedometer work?

—

Go to 

Step 10

Go to 

Step 3

3

1. Disconnect the VSS connector.
2. Ignition “ON”.
3. Using a test light to battery +, probe the connector

ground wire.

Did the light illuminate?

—

Go to 

Step 5

Go to 

Step 4

4

Repair the sensor ground.

Is the action complete?

—

Verify repair

—

5

1. Ignition “ON”, sensor disconnected.
2. Using a DVM, measure at the VSS connector

between ground and voltage supply.

Was the measurement near the specified value?

Battery

voltage

Go to 

Step 7

Go to 

Step 6

6

Repair the open or short to ground which may have
blown the meter fuse.

Is the action complete?

—

Verify repair

—

7

1. Ignition “ON”, VSS disconnected.
2. Using a DVM, measure at the VSS connector

between ground and the wire from the
speedometer.

Was the measurement near the specified value?

7.5-8 V

Go to 

Step 9

Go to 

Step 8

8

Check for an open or short circuit between the
speedometer and the VSS.

Was an open or short circuit located?

—

Verify repair

Go to 

Step 9

9

Replace the speedometer.

Is the action complete?

—

Verify repair

—