Diagnostic Trouble Code (Dtc) P0481 Cooling Fan 2 Control Circuit Malfunction - Isuzu 1999 RODEO Workshop Manual

DIAGNOSTIC TROUBLE CODE (DTC) P0481 COOLING FAN 2 CONTROL
Circuit Description
The Powertrain Control Module (PCM) controls the
engagement of the cooling fan Low speed through the
use of a relay and a control circuit. If the PCM commands
the fan to Low speed and then senses that the fan did not
turn ON, or if the PCM commands the fan OFF from Low
speed and then senses that the fan did not turn OFF, the
PCM will set a DTC P0481. DTC P0481 is a type D code.
Conditions for Setting the DTC
f Ignition voltage is greater than 10 volts.
f Engine run time is greater than 32 seconds.
The above conditions are met and one of the following
conditions are met for 25 seconds within a 50 second test
sample:
f PCM sensed voltage is High with the High Speed Fan
OFF.
OR
f PCM sensed voltage is High with the High Speed Fan
ON.
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
CIRCUIT MALFUNCTION
Action Taken When the DTC Sets
f The PCM will not turn on the Malfunction Indicator
Lamp.
f The PCM will store the conditions that were present
when the DTC was set as Freeze Frame and in Failure
Records.
Conditions for Clearing the DTC
f A history DTC will clear after 40 consecutive trips
without a reported failure.
f The DTC can be cleared using the Scan Tool's "Clear
Info" function.
Diagnostic Aids
f Poor connections or a damaged harness – Inspect the
harness connectors for: backed out terminals,
improper mating or damaged terminals. Also check for
open circuits, shorts to ground, and shorts to voltage.
6E1–279
D06RX058