DTC P2004: Metering Oil Pump Control Circuit Initial Check Problem

Fig 1: DTC P2004 Detection Condition & Possible Causes Chart

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Diagnostic Procedure 

Fig 2: DTC P2004 Diagnostic Procedure Chart (Step 1-2)

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Fig 3: DTC P2004 Diagnostic Procedure Chart (Step 3-6)

Courtesy of MAZDA MOTORS CORP.