Check SV4 Circuit

Failure detected in the SV4 solenoid valve electrical circuit.

Possible causes

Defective SV4 coil (open or shorted)
Control relay failure
Loose connection point
Signal wire damage from controller

Recommended actions

Measure ohms on SV4 coil
Verify 12VDC at the connector
Check related fuses
Swap coil with a known good one if possible

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