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Home >> Mazda >> 2014 >> 3 SV, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (On-Board Diagnostic - Automatic Transaxle) >> DTC P1784: 00 Hi Cut Valve Stuck Off/R-3-5 Cut Valve Stuck On >> Notes

DTC P1784: 00 Hi Cut Valve Stuck Off/R-3-5 Cut Valve Stuck On: Notes

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DTC P1784:00 DETECTION CONDITIONS AND POSSIBLE CAUSES (FW6A-EL)

DTC P1784:00  Hi cut valve stuck off/R-3-5 cut valve stuck on 
DETECTION CONDITION 
  • Under the following conditions, hi cut valve stuck-off or R-3-5 cut valve stuck-on detected by combination of gear ratio malfunction and oil pressure switch pattern malfunction:
    • Engine is running.
    • ATF temperature is 20 °C {68 °F} or more. 
    • There is no difference between vehicle speed signal from DSC HU/CM and output shaft speed sensor signal.
    • Turbine/input shaft speed sensor and output shaft speed sensor DTC is not recorded.

Diagnostic support note 
  • The check engine light does not illuminate.
  • The automatic transaxle warning light illuminates if the TCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the TCM.
  • PENDING CODE is available.
  • FREEZE FRAME DATA is not available.
  • DTC is stored in the TCM memory.
FAIL-SAFE FUNCTION 
  • Inhibits malfunctioning gear.
  • Limits engine torque.
  • Inhibits learning control.
  • Inhibits neutral idle control.
POSSIBLE CAUSE 
  • ATF is less than specified value
  • Hi cut valve malfunction
  • R-3-5 cut valve malfunction
  • Clutch burnt
SYSTEM WIRING DIAGRAM  Not applicable