Diagnostic Trouble Code (Dtc) P0463 Fuel Level Sensor Circuit High Input - Isuzu 1999 RODEO Workshop Manual

6E1–274 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DIAGNOSTIC TROUBLE CODE (DTC) P0463 FUEL LEVEL SENSOR CIRCUIT
Circuit Description
The Fuel Level sensor is an important input to the PCM for
the Enhanced Evaporative System Diagnostic. The PCM
needs the fuel level information in order to know the
volume of fuel in the tank. The fuel level affects the rate of
change in air pressure in the EVAP 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 greater than 85%
or less than 15% full. (This sensor signal disables the
misfire when the fuel levels are less than 15%). If the PCM
detects a continuous short to voltage in the Fuel Level
sensor or circuit, then a DTC P0463 will set. DTC P0463
is a type D code.
Conditions for Setting the DTC
f The Fuel Tank Level Slosh Test is completed.
f The Fuel Tank Level Main Test is completed.
f The Fuel Tank Level Data is valid.
f The Fuel Level signal voltage is greater than 4.9 volts
for a period greater than 20 seconds.
HIGH INPUT
Action Taken When the DTC Sets
f The PCM will not turn on the MIL.
Conditions for Clearing the DTC
f The PCM turns the MIL off after 3 consecutive driving
trips without a fault condition present.
f A history DTC will clear if no fault conditions have been
detected for 40 warm–up cycles (coolant temperature
has risen 40°F from the start–up coolant temperature
and the engine coolant temperature exceeds 160°F
during that same ignition cycle) or the Tech 2 clearing
feature has been used.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
5. This step checks the wiring, connections, and the
PCM.
7. This step checks the wiring, connections, and the
PCM.
D06RX057