Dual circuit steering PWM 3 SCB or Open Load.
• Check wiring (to M55, PWM Output 3) • Check connectors (to M55, PWM Output 3) • Check dual circuit steering solenoid o Measure the resistance between the two inputs to M55, it should be around 20 Ohms o Measure the resistance between the outputs from M55 to the electric motor  When the solenoid is off, i.e. no applied voltage over the solenoid inputs, the resistance between the solenoid outputs to the electric motor should be infinite  When the solenoid is on, i.e. the applied voltage over the solenoid inputs is 24 V, the resistance between the solenoid outputs to the electric motor should be quite low, around a few Ohms. • Measure the applied solenoid voltage between signal to M55 and ground. It should be 24 V.
What you'll see
This DTC covers two different fault cases that cannot be electrically separated. If the cause is open load in either on or off state, the solenoid is not connected or broken and thus the motor cannot be activated. If the cause is instead short circuit to battery, the solenoid and motor will be activated, if connected, when the signal is low. A warning will be displayed in the ICL. If a simultaneous sensor malfunction in the primary hydraulic system is present, a (different) warning will be displayed in the ICL. If a simultaneous hydraulic malfunction in the primary hydraulic system is present, a (different) warning will be displayed in the ICL.
System reaction
Amber failure in circ 1 and 2 Red failure in circ 1 and 2 Amber failure steering circ 2
Diagnostic depth
Dual Circuit Steering solenoid output (Component M55), connected on PWM Output 3 (signal A15, ground A13), controlling electric motor and flow in secondary circuit is either not connected or short circuited to battery.
• Defect wiring • Short circuit to battery • Wires not connected • Defect connectors • Defect dual circuit steering solenoid