Electronic Engine Controls - Ford EXPEDITION 2005 Technical Training Manual

LESSON 3: POWERTRAIN

Electronic Engine Controls

Electronic Engine Controls
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New integrated 4x4 strategy.
– 4x4 operational strategy is now incorporated into the PCM. This eliminates the need for a separate module to
control the transfer case.
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The PCM utilizes a 190 pin connector.
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New PCM controlled, electronically heated PCV port.
– This electrically heated systems uses a heating element enclosed in the PCV tube (mounted on the left side of
the intake manifold) to prevent the valve or tube from freezing.
– On this application the PCV heater uses an inline thermostatic switch. When ambient air temperature nears
0 C (32 F) this switch completes the Positive Crankcase Ventilation Valve Heater Control (PCVHC) circuit
and turns the heater ON. The PCV heater is off when the engine is not running to prevent unnecessary
battery drain.
•
Dual knock sensors.
– Dual knock sensors (mounted in the engine valley) provide feedback to the electronic engine control system
for controlling spark knock. These sensors are accessed by removing the intake manifold assembly.
3-36 02-SEP-04 2005 Expedition/Navigator New Model Technician Training