Case IH 3465 – Engine Control Module (ECM): Engine Throttle Actuator 2 Control Command / Engine Throttle Control Actuator 2 Circuit

The Engine Control Module (ECM) has detected an anomaly (open circuit, short to ground, or short to power) in the circuit controlling the Engine Throttle Actuator 2. Alternatively, if a generic water pump control actuation fault is present, the ECM has detected that the electronic control valve or PWM signal commanding the variable-speed water pump is not responding as expected.

• Case IH tractors and equipment utilizing modern electronically controlled FPT (Fiat Powertrain Technologies) Tier 3, Tier 4A, and Tier 4B engines equipped with secondary throttle actuators

1. 1

   Verify the Code: Connect a CNH Electronic Service Tool (EST) to verify if the code is SPN 3465 (Throttle Actuator) or a different SPN related to the water pump.

2. 2

   Wiring & Harness Check: Inspect the wiring harness leading from the ECM to the actuator in question. Look for chafed wires, melted insulation, or corrosion inside the connector pins.

3. 3

   Voltage/Continuity Test: Use a multimeter to check for a 5V reference signal and proper ground at the actuator connector. Test the signal wire for continuity back to the ECM.

4. 4

   Actuator Test: If diagnosing a water pump control valve, use the CNH EST to manually command the actuator to open/close and listen for movement or monitor coolant flow.

1. 1

   Disconnect battery

   Disconnect the machine's battery power to prevent shorting the ECM.

2. 2

   Locate actuator

   Locate the affected actuator on the engine block (Throttle Actuator 2 or the Water Pump Control Valve, depending on the true verified code).

3. 3

   Inspect and repair connector

   Disconnect the electrical pigtail. If the connector is heavily corroded or contaminated with oil/coolant, splice in a new OEM connector pigtail.

4. 4

   Remove faulty actuator

   If the wiring tests perfectly but the code persists, the actuator itself has failed internally. Unbolt the faulty actuator/pump assembly.

5. 5

   Clean mating surface

   Clean the mating surface on the engine block thoroughly.

6. 6

   Install new actuator

   Install the new actuator or water pump assembly with a new OEM gasket. Torque mounting bolts to factory specifications.

7. 7

   Reconnect electricals

   Reconnect the electrical harness and battery.

8. 8

   Verify repair

   Connect the CNH EST, clear the inactive fault codes, and run the engine up to operating temperature to verify the repair.