DTC P0819-00: M Position Switch/Up Switch/Down Switch Signal Error: Notes

DTC P0819-00 (TCM (GW6A-EL)) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0819-00	M POSITION SWITCH/UP SWITCH/DOWN SWITCH SIGNAL ERROR
DETECTION CONDITION	Under the following conditions, any of (1) to (4) conditions occurs for 1 s: Engine is running. Battery voltage is 8 V or more. Transaxle range sensor related DTC is not recorded. M position switch signal is on even though forward oil pressure switch is on in any position other than D position. M position switch signal is off even though up or down switch signal is on in D position. Up switch signal is on even though M position switch signal is off in any position other than D position. Down switch signal is on even though M position switch signal is off in any position other than D position.
FAIL-SAFE FUNCTION	Inhibits manual mode.
POSSIBLE CAUSE	Instrument cluster DTC is stored. Selector lever component connector or terminals malfunction Selector lever component malfunction M position switch malfunction Up switch malfunction Down switch malfunction Open circuit in wiring harness between Selector lever component terminal J and body ground Instrument cluster connector or terminals malfunction Short to ground in wiring harness between the following terminals: Selector lever component terminal E-Instrument cluster terminal H Selector lever component terminal C-Instrument cluster terminal F Selector lever component terminal D-Instrument cluster terminal G Short to power supply in wiring harness between the following terminals: Selector lever component terminal E-Instrument cluster terminal H Selector lever component terminal C-Instrument cluster terminal F Selector lever component terminal D-Instrument cluster terminal G Open circuit in wiring harness between the following terminals: Selector lever component terminal E-Instrument cluster terminal H Selector lever component terminal C-Instrument cluster terminal F Selector lever component terminal D-Instrument cluster terminal G Instrument cluster malfunction
Courtesy of MAZDA MOTORS CORP.