Trouble Code: 31 / P1721 - Check Flow 9

TROUBLE CODE: 31 / P1721 - INPUT FROM MODE SWITCH ABNORMAL

Check Flow	Trouble Code	Phenomenon	Standard
9	31 (P1721)	The electromagnetic coil is broken or shorted to the battery or GND.	___

Fig 1: Trouble Code P1721, TOD Control Unit Circuit Diagram - Electromagnetic Coil

Courtesy of ISUZU MOTOR CO.

Fig 2: Trouble Code P1721, Diagnostic Procedure Chart - Electromagnetic Coil Broken

Courtesy of ISUZU MOTOR CO.