International DT466E ECM Wiring Diagram Q&A for Cooling System
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and there should be power on relay terminal 87 (black wire) going to the intake air heater. CAUTION: Don't leave the jumper wire connected too long as the intake air heater uses up to 200 amps and will drain the battery quickly. Scenario 3 Questions: 3A) If the intake air heater doesn't work how can you "test" the engine control module?. Intake heater relay replacement I too have a California 02' which intake heater code came on., P0540. After a little diagnosis found the relay to be bad. The controller is said to be non serviceable, but you can replace the relay, once you open it up, but coming up with a part number is a trick with no specs..
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Understanding The Air Intake Heater Relay. The Air Intake Heater Relay plays a crucial role in the functioning of Cummins engines. It controls one electrical circuit responsible for powering the engine Heater Grid. This relay is responsible for opening and closing contacts in the circuit to activate the operation of the heater grid.. Start by removing the black ground wire, and then disconnect the red wire from the heater, following that wire to the relay/solenoid. Loosen the nut holding the red wire on and remove the red wire. Be sure to leave the blue wire connected to the relay; it needs to stay. You can then remove the AIH from the intake manifold.
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