Circuit Description
WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. However, it is still accessible from the selected car via links, so may be relevant.
PCM controls cooling fan low speed operation through use of a low fan relay and a control circuit. If PCM commands fan low speed operation and senses fan did not turn on, or commands fan operation off and fan continues to run, DTC P0480 will be set.
When DTC sets, PCM will not illuminate MIL. PCM will store conditions present when DTC was set as FREEZE FRAME data in the FAILURE RECORDS data.
A history DTC will clear after 40 consecutive ignition cycle which diagnostic runs and fault is no longer recognized. DTC can be cleared with scan tool, or by disconnecting battery voltage feed to PCM.