Case IH 3188 – Engine Control Unit (ECU A-095): Open load error of injector in cylinder 1

The Engine Control Unit (ECU) detected the electrical pattern for an 'open load' (an incomplete electrical circuit or break in the connection) during the evaluation of the cylinder 1 injector (designated as component Y-061).

• Farmall
• skid steer
• Steiger T4B
• Puma 140
• Puma 150
• Puma 155
• Puma 165
• Puma 185
• Puma 200
• Maxxum
• Magnum
• Steiger
• 240 Series Combine 5130
• 240 Series Combine 5140
• 240 Series Combine 6160
• 240 Series Combine 7160
• Patriot Sprayer
• WD-series windrower

1. 1

   Check for concurrent codes to see if any other error codes are displayed.

2. 2

   Check power supply: Ensure that the tractor's battery power supply has not been connected to an external power supply (such as a jump box or external charger), as voltage irregularities can trigger false open load patterns in the ECU.

1. 1

   Inspect the Wiring Harness

   Trace the wiring harness from ECU A-095 to the cylinder 1 injector (Y-061). Look for chafed wires, disconnected plugs, or broken pins that would cause an open circuit.

2. 2

   Test the Injector Connection

   Disconnect the electrical connector at the cylinder 1 injector. Check for corrosion or pushed-out pins.

3. 3

   Ohm Test the Injector

   Measure the resistance across the terminals of the cylinder 1 injector. If the injector reads as an open circuit (infinite resistance) or is out of OEM specification, the injector solenoid has failed internally.

4. 4

   Replace the Injector

   If the injector fails the resistance test, replace the cylinder 1 fuel injector and install new O-rings and copper tip washers.

5. 5

   ECU Power Stage Check

   If the wiring is completely intact and the injector tests good, the hardware error may reside within the ECU A-095 power stages, requiring ECU replacement or reprogramming.