Daewoo Matiz (2003 year). Manual - part 78

1F – 222  ENGINE CONTROLS

MAA1F250

DIAGNOSTIC TROUBLE CODE (DTC) – P0463 FUEL LEVEL SENSOR HIGH

VOLTAGE

Circuit Description

The engine control module(ECM) uses the fuel level in-
put from the Fuel Level Sensor to calculate expected va-
por pressures within the fuel system. Vapor pressure
vary as the fuel level changes. Vapor pressure is critical
in determining if the evaporative emission (EVAP) sys-
tem is operating properly. Fuel Level is also used to de-
termine if the Fuel level is too high or too low to be able
to accurately detect EVAP system faults. This Diagnos-
tic Trouble Code(DTC) detects a stuck fuel level sender.

Conditions for Setting the DTC

D

Fuel Level Sensor voltage is higher than 4.9V.

D

Fuel Level Sensor circuit high voltage.

Action Taken When the DTC Sets

D

The Malfunction Indicator Lamp (MIL) will not illumi-
nate.

D

The ECM will store conditions which were present
when the DTC was set as Failure Records data only.

D

This information will not be stored in the Freeze
Frame data.

Conditions for Clearing the MIL/DTC

D

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

D

DTC(s) can be cleared by using the scan tool.

Diagnostic Aids

Inspect harness connectors for backed-out terminal, im-
proper mating, broken locks, improperly formed or dam-
aged terminals, and poor terminal-to-wire connection.

Inspect the wiring harness for damage.

A stuck Fuel Level Sensor may cause the DTC to set. If
DTC P0463 cannot be duplicated, the information in-
cluded in the Freeze Frame data can be useful in deter-
mining vehicle operating conditions when the DTC was
first set.

Resistance check for the Fuel Level Sensor.

Empty = 100 ohms or over.

Half full = about 32.5 ohms.

Full = 10 ohms or less.

ENGINE CONTROLS  1F – 223

DTC P0463 – Fuel Level Sensor High Voltage

Step

Action

Value(s)

Yes

No

1

Perform an Euro On-Board Diagnostic (EOBD)
System Check.
Is the system check complete?

–

Go to Step 2

Go to

“On-Board
Diagnostic

System Check”

2

1. Turn the ignition switch to ON.
2. Install a scan tool.
3. Operate the vehicle within Freeze Frame

conditions as noted.

Is the Diagnostic Trouble Code (DTC) P0463 set?

–

Go to Step 3

Go to

“Diagnostic

Aids”

3

1. Disconnect the fuel sender electrical connector

from the fuel pump.

2. Using a digital voltmeter (DVM), measure the

voltage in the signal circuit at terminal 1.

Is the voltage within the specified value?

0.2–4.9V

Go to Step 4

Go to Step 6

4

Check for a proper ground connection at the fuel
tank and repair as necessary.
Is a repair necessary?

–

Go to Step 11

Go to Step 5

5

1. Remove the fuel sender from the fuel tank.
2. Reconnect the fuel pump electrical connector.
3. Monitor the Fuel Level Sensor parameter on the

scan tool while moving the Fuel Level Sensor
float from the empty position to the full position.

4. Repeat the procedure several times.
Does the Fuel Level Sensor value on the scan tool
increase and then decrease steadily when the float
is moved?

–

Go to

“Diagnostic

Aids”

Go to Step 8

6

Check for an open or short to battery voltage in the
Fuel Level Sensor circuit and repair as necessary.
Is the repair necessary?

–

Go to Step 11

Go to Step 9

7

Repair the open or short to battery voltage in the
Fuel Level Sensor circuit between the Fuel Level
Sensor harness connector and the Fuel Level
Sensor.
Is the repair complete?

–

Go to Step 11

–

8

Replace the fuel sender assembly.
Is the replacement complete?

–

Go to Step 11

–

9

1. Connect the fuel pump electrical connector.
2. Disconnect the engine control module(ECM)

connector.

3. Using a digital voltmeter (DVM) measure the

voltage in the signal circuit, at terminal 81.

Does the DVM read within the specified value?

0.2–4.9V

Go to Step 10

Go to 

section 9E,

Instrumenta-

tion/Driver

Information

10

Replace the ECM.
Is the repair complete?

–

Go to Step 11

–

11

1. Using the scan tool, clear the Diagnostic Trouble

Codes (DTCs).

2. Start the engine and idle at normal operating

temperature.

3. Operate the vehicle within the conditions for

setting the DTC as specifiec in the supporting
text.

Does the scan tool indicate that this diagnostic ran
and passed?

–

Go to Step 12

Go to Step 2

1F – 224  ENGINE CONTROLS

DTC P0463 – Fuel Level Sensor High Voltage (Cont’d)

Step

Action

Value(s)

Yes

No

12

Check if any additional DTCs are set.
Are any DTCs displayed that have not been
diagnosed?

–

Go to

Applicable DTC

table

System OK

ENGINE CONTROLS  1F – 225

BLANK