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DTC P1289: Notes

DTC P1289 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES

DTC P1289 CHT sensor circuit high input
DETECTION CONDITION 
  • Indicates a CHT sensor circuit open.
POSSIBLE CAUSE 
  • Open circuit in wiring harness between CHT sensor terminal A and PCM terminal 2AL
  • Open circuit in wiring harness between CHT sensor terminal B and PCM terminal 2AN
  • Short to power supply in wiring harness between CHT sensor terminal B and PCM terminal 2AN
  • CHT sensor malfunction
  • Connector or terminal malfunction
G04969305Courtesy of MAZDA MOTORS CORP.