Diagnostic Aid

If code 25 is displayed, voltage between BLACK/WHITE wire and ground should be 12 volts and resistance between LIGHT GRAY/YELLOW wire and circuit No. 4 should be zero. If code 53 is displayed, resistance between circuits No. 9 and 10 and ground should be zero.

Fig 1: Code No. 25, 53 Schematic, Pressure Regulator VSV

Courtesy of ISUZU MOTOR CO.

Fig 2: Code No. 25, 53 Connector, Pressure Regulator VSV

Courtesy of ISUZU MOTOR CO.

Fig 3: Code No. 25, 53 Flow Chart, Pressure Regulator VSV

Courtesy of ISUZU MOTOR CO.