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Home › Mazda › 2003 › B2300 Base, Automatic › 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.