: Perform a continuity test on the wiring between the pump solenoid and the machine's main controller to rule out a broken wire. Reset the Code
The solenoid valve on the P1 pump (Primary Pump A) has failed internally.
) setting. Measure the resistance directly across the two male pins of the coolant temperature sensor. A healthy thermistor shows shifting resistance based on temperature:
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is a Doosan equipment fault code related to the vehicle/powertrain vacuum/pressure valve system (VPV). It typically indicates a fault in the VPV circuit — often a stuck valve, electrical issue (sensor, wiring, connector), or low system pressure. Below are likely causes, step-by-step diagnostics, and repair options.
Modern Doosan excavators, wheel loaders, and other heavy machinery use an advanced on-board computer system to monitor performance. When a problem is detected, the system generates a specific fault code. This code is displayed on the machine's LCD monitor in the cab, immediately alerting the operator to an issue.
: Navigate to the pilot valve control block usually positioned under the cab or adjacent to the main hydraulic pump. Step 2: Visual and Mechanical Wire Audit : Perform a continuity test on the wiring
Once you clear the code, use these best practices:
Disconnect the plug at the P1 proportional valve and use a multimeter to measure the resistance of the solenoid coil. Compare this value to the manufacturer's specifications (usually a few ohms); an "O.L" (open loop) reading indicates a dead solenoid.
: The first step is always to consult the equipment's operator's manual or diagnostic manual. These resources often list common fault codes and provide troubleshooting steps. Measure the resistance directly across the two male
: Use a multimeter to measure the resistance of the solenoid. Compare this against the manufacturer's specifications found in the Doosan Service Manual .
: After checking connections, try to clear the code from the display. If the fault is "Active," the code will likely reappear immediately until the physical issue is fixed. Consult Technical Support
: The excavator restricts engine RPMs and hydraulic speed.
Use proper, clean coolant to prevent sensor fouling.
[ECM Control Unit] <=======( Broken Wire / Loose Pins )=======> [Coolant Temp Sensor] || (Internal Failure) 1. Wiring Harness Faults