CHEVROLET AVEO 2002 Service Repair Manual

DTC P0462
Circuit Description
The fuel level sensor changes resistance based on fuel level. The fuel level sensor has a signal circuit and a
ground circuit. The engine control module (ECM) applies 5 volts on the signal circuit to the sensor. The ECM
monitors the changes in this voltage caused by changes in the resistance of the sensor in order to determine fuel
level.
When the fuel tank is full, the sensor resistance is low, and the ECM signal voltage is high. When the fuel tank
is empty, the sensor resistance is high, and the signal voltage is low.
The ECM uses inputs from the fuel level sensor in order to calculate the total fuel percentage remaining in the
fuel tank. The ECM uses the fuel level information for the evaporative emission (EVAP) and misfire
diagnostics. The fuel level information is sent to the instrument panel cluster (IPC).
If the ECM detects a signal voltage lower than the operating range of the sensor, this DTC sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0462 Fuel Level Sensor Circuit Low Voltage
Conditions for Running the DTC
The engine is running.
DTC P0462 runs continuously once the above conditions are met.
Conditions for Setting the DTC
The ECM detects that fuel level signal voltage is less than 0.25 volts.
The above condition is present for more than 10 seconds.
Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The control module
stores this information in the Freeze Frame/Failure Records.
The fuel gage defaults to empty.
Conditions for Clearing the MIL/DTC
11
Are there any DTCs that have not been
diagnosed?
-
(DTC) List in
Engine Controls
- 1.6L
System OK

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The control module turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and
does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other
emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
Diagnostic Aids
Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you
cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may
aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid
in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the
vehicle within the same freeze frame conditions (RPM, engine load, vehicle speed, temperature, etc.).
This will isolate when the DTC failed.
Refer to the following:
Intermittent Conditions
in Engine Controls - 1.6L (L91)
Test Description
The number below refers to the step number on the diagnostic table.
2: This step determines if the fault is present.
DTC P0462
StepActionValueYesNo
Schematic Reference: Instrument Cluster Schematics
Connector End View Reference: Instrument Panel, Gages, and Console Connector End Views

1
Did you perform the Diagnostic System Check -
Instrument Cluster?
-
Go to Step 2
Go to
Diagnostic
System Check
- Instrument
Cluster
2
1. Turn ON the ignition, with the engine
OFF.
2. Observe the Fuel Level Sensor voltage
parameter with a scan tool.
Is the voltage more than the specified value?
4.25 V
Go to Step 4 Go to Step 3
1. Observe the Freeze Frame/Failure Records
for this DTC.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.

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3
4. Operate the vehicle within the Conditions
for Running the DTC. You may also
operate the vehicle within the conditions
that you observed from the Freeze
Frame/Failure Records.
Did the DTC fail this ignition?
-
Go to Step 4
Go to
Diagnostic Aids
4
1. Turn OFF the ignition.
2. Disconnect the fuel level sensor through
the access panel under the rear seat.
3. Turn ON the ignition, with the engine
OFF.
4. Observe the Fuel Level Sensor voltage
parameter with a scan tool.
Is the voltage less than the specified value?
4.25 V
Go to Step 6 Go to Step 5
5
Test the signal circuit of the fuel level sensor for
a short to ground. Refer to Circuit Testing
and
Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?-
Go to Step 10 Go to Step 7
6
Test for shorted terminals and poor connections
at the fuel level sensor. Refer to Testing for
Intermittent Conditions and Poor
Connections and Connector Repairs in Wiring
Systems.
Did you find and correct the condition?-
Go to Step 10 Go to Step 8
7
Test for shorted terminals and poor connections
at the engine control module (ECM). Refer to
Testing for Intermittent Conditions and Poor
Connections and Connector Repairs in Wiring
Systems.
Did you find and correct the condition?-
Go to Step 10 Go to Step 9
8
Replace the fuel sender assembly. Refer to the
following:
Fuel Sender Assembly Replacement
in Engine
Controls - 1.6L (L91)

Did you complete the replacement?-
Go to Step 10
-
9
Replace the control module. Refer to the
following:
Engine Control Module (ECM) Replacement

in Engine Controls - 1.6L (L91)
--

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DTC P0463
Circuit Description
The fuel level sensor changes resistance based on fuel level. The fuel level sensor has a signal circuit and a
ground circuit. The engine control module (ECM) applies 5 volts on the signal circuit to the sensor. The ECM
monitors the changes in this voltage caused by changes in the resistance of the sensor in order to determine fuel
level.
When the fuel tank is full, the sensor resistance is low, and the ECM signal voltage is high. When the fuel tank
is empty, the sensor resistance is high, and the signal voltage is low.
The ECM uses inputs from the fuel level sensor in order to calculate the total fuel percentage remaining in the
fuel tank. The ECM uses the fuel level information for the evaporative emission (EVAP) and misfire
diagnostics. The fuel level information is sent to the instrument panel cluster (IPC).
If the ECM detects a signal voltage higher than the operating range of the sensor, this DTC sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0463 Fuel Level Sensor Circuit High Voltage
Conditions for Running the DTC

Did you complete the replacement?
Go to Step 10
10
1. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions
for Running the DTC. You may also
operate the vehicle within the conditions
that you observed from the Freeze
Frame/Failure Records.
Did the DTC fail this ignition?
-
Go to Step 2 Go to Step 11
11
Observe the Capture Info with a scan tool.
Are there any DTCs that have not been
diagnosed?
-
Go to
Diagnostic
Trouble Code
(DTC) List in
Engine Controls
- 1.6L
System OK

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The engine is running.
DTC P0463 runs continuously once the above conditions are met.
Conditions for Setting the DTC
The fuel level signal voltage is more than 4.25 volts.
The above condition is present for more than 10 seconds.
Action Taken When the DTC Sets
The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The control module
stores this information in the Freeze Frame/Failure Records.
The fuel gage defaults to empty.
Conditions for Clearing the MIL/DTC
The control module turns OFF the MIL after 3 consecutive ignition cycles that the diagnostic runs and
does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other
emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
Diagnostic Aids
Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you
cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may
aid in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also aid
in determining the number of ignition cycles that the diagnostic reported a pass and/or fail. Operate the
vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature, etc.). This will
isolate when the DTC failed.
Refer to the following:
Intermittent Conditions
in Engine Controls - 1.6L (L91)
Test Description
The number below refers to the step number on the diagnostic table.
2: This step determines if the fault is present.
DTC P0463
StepActionValueYesNo
Schematic Reference: Instrument Cluster Schematics

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Connector End View Reference: Instrument Panel, Gages, and Console Connector End Views
1
Did you perform the Diagnostic System Check -
Instrument Cluster?
-
Go to Step 2
Go to
Diagnostic
System Check
- Instrument
Cluster
2
1. Turn ON the ignition, with the engine
OFF.
2. Observe the Fuel Level Sensor voltage
parameter with a scan tool.
Is the voltage parameter less than the specified
value?
0.25 V
Go to Step 4 Go to Step 3
3
1. Observe the Freeze Frame/Failure
Records for this DTC.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions
for Running the DTC. You may also
operate the vehicle within the conditions
that you observed from the Freeze
Frame/Failure Records.
Did the DTC fail this ignition?
-
Go to Step 4
Go to
Diagnostic Aids
4
1. Disconnect the fuel level sensor through
the access panel under the rear seat.
2. Connect a 3-amp fused jumper wire
between the signal circuit of the fuel level
sender and the low reference circuit of the
fuel level sender female terminal side.
3. Turn ON the ignition, with the engine
OFF.
4. Observe the Fuel Level Sensor voltage
parameter with a scan tool.
Is the voltage more than the specified value?
0.25 V
Go to Step 8 Go to Step 5
5
Jumper the fuel level sensor signal circuit to a
known good ground.
Is the voltage more than the specified value?
0.25 V
Go to Step 7 Go to Step 6
6
Test the signal circuit of the fuel level sensor for
an open, for a high resistance, or for a short to
voltage. Refer to Circuit Testing
and Wiring
Repairs in Wiring Systems.
-

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Did you find and correct the condition?Go to Step 12 Go to Step 8
7
Test the low reference circuit of the fuel level
sensor for an open, or for a high resistance.
Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems.
Did you find and correct the condition?-
Go to Step 12 Go to Step 9
8
Test for shorted terminals and poor connections
at the fuel level sensor. Refer to Testing for
Intermittent Conditions and Poor
Connections and Connector Repairsin Wiring
Systems.
Did you find and correct the condition?-
Go to Step 12 Go to Step 10
9
Test for shorted terminals and poor connections
at the engine control module (ECM). Refer to
Testin
g for Intermittent Conditions and Poor
Connections and Connector Repairsin Wiring
Systems.
Did you find and correct the condition?-
Go to Step 12 Go to Step 11
10
Replace the fuel sender assembly. Refer to the
following:
Fuel Sender Assembly Replacement
in Engine
Controls - 1.6L (L91)

Did you complete the replacement?-
Go to Step 12
-
11
Replace the control module. Refer to the
following:
Engine Control Module (ECM) Replacement

in Engine Controls - 1.6L (L91)

Did you complete the replacement?-
Go to Step 12
-
12
1. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions
for Running the DTC. You may also
operate the vehicle within the conditions
that you observed from the Freeze
Frame/Failure Records.
Did the DTC fail this ignition?
-
Go to Step 2 Go to Step 13
Go to

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2005 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, & Console - Aveo
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DTC P0464
Circuit Description
The fuel level sensor changes resistance based on fuel level. The fuel level sensor has a signal circuit and a
ground circuit. The engine control module (ECM) applies 5 volts on the signal circuit to the sensor. The ECM
monitors the changes in this voltage caused by changes in the resistance of the sensor in order to determine fuel
level.
When the fuel tank is full, the sensor resistance is low, and the ECM signal voltage is high. When the fuel tank
is empty, the sensor resistance is high, and the signal voltage is low.
The ECM uses inputs from the fuel level sensor in order to calculate the total fuel percentage remaining in the
fuel tank. The ECM uses the fuel level information for the evaporative emission (EVAP) and misfire
diagnostics. The fuel level information is sent to the instrument panel cluster (IPC).
If the ECM detects that the fuel level sensor signal changes more than a calibrated amount within a certain time,
this DTC sets.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0464 Fuel Level Circuit Intermittent
Conditions for Running the DTC
DTCs P0107, P0108, P0112, P0113, P0122, P0123, and P0502 are not set.
The engine is running.
This diagnostic will be delayed for 5 seconds if one or more of the following occurs:
The change in manifold absolute pressure (MAP) sensor is more than 10 kPa.
The change in engine speed is more than 50 RPM.
The change in throttle position (TP) sensor is less than 2 percent.
The intake air temperature (IAT) sensor is more than -10°C (50°F).
Conditions for Setting the DTC
The ECM detects that the fuel level changes more than 3.9 percent for 7.5 seconds.
Action Taken When the DTC Sets
13
Observe the Capture Info with a scan tool.
Are there any DTCs that have not been
diagnosed?
-
Diagnostic
Trouble Code
(DTC) List in
Engine
Controls - 1.6L
System OK

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The control module stores the DTC information into memory when the diagnostic runs and fails.
The malfunction indicator lamp (MIL) will not illuminate.
The control module records the operating conditions at the time the diagnostic fails. The control module
stores this information in the Failure Records.
The driver information center, if equipped, may display a message.
Conditions for Clearing the DTC
A current DTC Last Test Failed clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other
non-emission related diagnostic.
Clear the DTC with a scan tool.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
3: This step attempts to determine if the intermittent fault is a connector.
4: This step attempts to determine the location of the intermittent fault.
DTC P0464
StepActionYesNo
Schematic Reference: Instrument Cluster Schematics or
Connector End View Reference: Instrument Panel, Gages, and Console Connector End Views

1
Did you perform the Diagnostic System Check - Instrument
Cluster?
Go to Step
2
Go to Diagnostic
System Check -
Instrument Cluster

2
1. Start the engine.
2. Observe the DTC Information with a scan tool.
Are DTCs P0461, P0462, and P0463 also set?Go to
Dia
gnostic
Trouble
Code
(DTC)
List Go to Step 3
3
Observe the Fuel Level Sensor voltage parameter with a scan
tool while moving the fuel level sensor connector and the
engine control module (ECM) connector. Refer to Inducing
Intermittent Fault Conditions in Wiring Systems.
Does the scan tool indicate an abrupt change in value?Go to Step
5
Go to Step 4
4
Observe the fuel level sensor voltage with a scan tool while
moving the wiring harness between the fuel level sensor
connector and the ECM. Refer to Inducing Intermittent
Fault Conditions in Wiring Systems.
Does the scan tool indicate an abrupt change in value?Go to Step
6
Go to Intermittent
Conditionsin Engine
Controls
Repair the connector terminal as necessary. Refer to

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SYMPTOMS - INSTRUMENT PANEL, GAGES AND CONSOLE
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
Clock Malfunction
Engine Coolant Temperature Gage Inaccurate or Inoperative
Fuel Gage Inaccurate or Inoperative
Speedometer and/or Odometer Inaccurate or Inoperative
Chime Inoperative (Seat Belt) Seat belt
Door Open Warning Chime Inoperative
Key Reminder Chime Inoperative
DOOR OPEN WARNING CHIME INOPERATIVE
Door Open Warning Chime Inoperative
5Connector Repairs in Wiring Systems.
Did you complete the repair?Go to Step
7
-
6
Repair the harness/wiring as necessary. Refer to Wiring
Repairs in Wiring Systems.
Did you complete the repair?Go to Step
7
-
7
1. Clear the DTCs with a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine.
4. Operate the vehicle within the Conditions for Running
the DTC. You may also operate the vehicle within the
conditions that you observed from the Freeze
Frame/Failure Records.
Did the DTC fail this ignition?
Go to Step
2
Go to Step 8
8Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?
Go to
Dia
gnostic
Trouble
Code
(DTC)
List in
Engine
Controls -
1.6L
System OK
StepActionValuesYesNo
Inspect the chime module connector to make sure

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2005 ACCESSORIES & EQUIPMENT Instrument Panel, Gages, & Console - Aveo
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Friday, July 31, 2009 1:07:02 PMPage 27 © 2005 Mitchell Repair Information Company, LLC.