Circuit Description

Engine Oil Pressure Switch (OPS) is a normally closed switch that opens with proper oil pressure. With ignition switch in RUN position, with engine off, Powertrain Control Module (PCM) should detect a low signal voltage input. With engine running, pressure switch opens, and PCM should detect a high signal voltage input. PCM tests state of engine oil pressure circuit with ignition switch in RUN position, with engine off. If PCM detects a high voltage input on the engine oil pressure signal circuit, DTC P1189 will set.

DTC P1189 will set when PCM senses high voltage input on OPS circuit (Tan/Black wire) for more than 10 seconds. When DTC P1189 sets, PCM will not illuminate SERVICE ENGINE SOON/Malfunction Indicator Light (MIL). PCM will store conditions which were present when DTC set as FAILURE RECORDS data only. Information will not be stored as FREEZE FRAME data.

A current DTC P1189 becomes a history DTC if condition for setting DTC is no longer present. A history DTC P1189 will clear after 40 consecutive ignition cycles if condition for setting DTC is no longer present. DTC will also clear when scan tool is used to clear DTCs.