Conditions for Running the DTC
| • | The ignition is ON. |
| • | The system voltage is between 11 and 16 volts. |
Circuit Description
The Powertrain Control Module (PCM) uses the fuel level input in order to calculate the expected vapor pressures within the fuel system. These vapor pressures vary as the fuel level changes. The vapor pressure is critical in determining if the evaporative emissions (EVAP) system is operating properly. The PCM also uses the fuel level in order to determine if the fuel level is too high or too low to be able to accurately detect EVAP system malfunction.
Conditions for Setting the DTC
Fuel level has not changed more than 1.6 percent in 193 km (120 miles).
Action Taken When the DTC Sets
| • | The PCM will record the operating conditions during the time which the diagnostic fails. This information will store in the Failure Records buffer. |
| • | A history DTC stores. |
| • | The fuel level will default to 40 percent. |
Conditions for Clearing the DTC
| • | A history DTC clears after 40 consecutive warm up cycles without a fault. |
| • | Use a scan tool to clear the DTCs. |
Diagnostic Aids
| • | Inspect for the following conditions that may cause intermittents: |
| - | Poor electrical connections |
| - | Rubbed through wire insulation |
| - | A wire that is broken inside the wire insulation |
| • | Thoroughly inspect any circuitry that is suspected as causing the intermittent complaint. Inspect for the following conditions: |
| - | Backed out terminals |
| - | Improper mating |
| - | Broken locks |
| - | Improperly formed or damaged terminals |
| - | Poor terminal to wire connections |
| • | Before replacing the PCM, inspect the PCM electrical connector terminals for the following conditions: |
| - | Improper mating |
| - | Broken locks |
| - | Physical damage to the wiring harness |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Step 2 | |||||||
2 | Are DTC P0462 or P0463 set? | -- | Go to DTC P0462 Fuel Level Sensor Circuit Low Voltage or to DTC P0463 Fuel Level Sensor Circuit High Voltage | Go to Step 3 | ||||||
3 |
Is the fuel level equal to the specified level? | 100% | Go to Step 4 | Go to Step 5 | ||||||
4 | Connect a jumper wire between the following circuits:
Does the Fuel Level equal the specified value? | 0% | Go to Step 10 | Go to Step 6 | ||||||
5 |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 | ||||||
6 |
Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 8 | ||||||
7 |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9 | ||||||
8 |
Did you find and correct the condition? | Go to Step 12 | Go to Step 9 | |||||||
|
Important:: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Refer to Powertrain Control Module Replacement . Did you complete the repair? | -- | Go to Step 12 | -- | |||||||
10 |
Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 11 | ||||||
11 |
Did you complete the repair? | -- | Go to Step 12 | -- | ||||||
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
