Case IH 3470 – Engine Control Unit (ECU): Engine Turbocharger Compressor Control / Turbocharger Compressor Bypass Actuator 1 Command

Indicates a fault with the Engine Turbocharger Compressor Control or Turbocharger Compressor Bypass Actuator 1 Command. It typically means the actuator circuit has failed high, failed low, or is open, preventing the engine from properly regulating turbocharger boost pressure.

• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Magnum Rowtrac
• Puma

1. 1

   Check the J1939 Data Link using a diagnostic tool to verify if the SPN 3470 code is active and check the Failure Mode Indicator (FMI) to determine if the circuit is failed high, failed low, or open.

2. 2

   Inspect the wiring harness leading to the turbocharger compressor bypass actuator for loose contacts, corrosion, or chafing that could cause an open or short circuit.

3. 3

   Perform an actuator test to verify if the turbocharger actuator is receiving the correct voltage command from the Engine ECU.

1. 1

   Disconnect the battery to ensure safety while working on the engine wiring.

   Disconnect the battery to ensure safety while working on the engine wiring.

2. 2

   Locate the turbocharger compressor bypass actuator on the engine block.

   Locate the turbocharger compressor bypass actuator on the engine block.

3. 3

   Disconnect the electrical connector to the actuator and inspect the pins for damage or loose contact.

   Disconnect the electrical connector to the actuator and inspect the pins for damage or loose contact.

4. 4

   If the wiring harness is damaged, repair or replace the affected section of the harness.

   If the wiring harness is damaged, repair or replace the affected section of the harness.

5. 5

   If the wiring tests normal but the actuator fails to respond to ECU commands, the turbocharger actuator (or the entire turbocharger assembly, depending on the specific FPT engine model's serviceability) must be removed and replaced.

   If the wiring tests normal but the actuator fails to respond to ECU commands, the turbocharger actuator (or the entire turbocharger assembly, depending on the specific FPT engine model's serviceability) must be removed and replaced.

6. 6

   Reconnect the battery, clear the fault codes using a diagnostic tool, and run the engine to verify that the turbocharger operates correctly and the code does not return.

   Reconnect the battery, clear the fault codes using a diagnostic tool, and run the engine to verify that the turbocharger operates correctly and the code does not return.