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Home >> Mazda >> 2003 >> B2300 Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1650 Or DTC P1651 >> Possible Causes

Possible Causes

Possible causes are:

PCM damaged.
PSP circuit open or shorted to SIG RTN.
PSP switch/shorting bar damaged.
SIG RTN circuit open or shorted to GND.

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