Question about Dodge Dakota
Hi, open the hood of your car. Starting at your engine, trace your air intake hose until you get to a black rectangular box. The hose that leads to the triangular box is the air intake hose...
Posted on Mar 18, 2011
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Posted on Jan 02, 2017
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Jun 17, 2014 | 2004 Honda Accord
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Mar 11, 2011 | Hyundai Sonata Hybrid Cars & Trucks
DTC P0540: Intake Air Heater - Incorrect Voltage
The Engine Control Module (ECM) uses an Intake Air Heater (IAH) to warm the incoming air for proper cylinder combustion. The ECM grounds the control coil of the IAH relay to energize the heater during cold weather operation. If the ECM detects voltage on the IAH circuit when the relay is commanded OFF, or incorrect voltage when the relay is commanded ON, this DTC will set.
There are several possible causes for this code including:
Faulty IAH Relay
Faulty IAH Relay Control Circuit
Faulty Line Voltage Reference Circuit
Faulty Heating Element
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