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Start by checking for good fuel pressure and test the fuel pump is working by supplying a direct 12v feed to it.
FUEL DISTRIBUTOR UNIT (U)
Fuel is metered and delivered to individual cylinders in direct relation to air intake volume, which is determined by airflow sensor plate position. U consists of fuel distributor with differential pressure regulator, Electro-Hydraulic Actuator (EHA), and airflow sensor with airflow sensor position indicator.
Cold start valve operation depends on coolant temperature and cranking signal. Duration of cold start injection is in direct relation to coolant temperature. Should engine start before cold start valve completes its cycle, cold start injection is canceled. Voltage is supplied by fuel pump relay.
Amount of enrichment depends on coolant temperature. During engine cranking cycle, enrichment signal does not fluctuate.
Fuel enrichment depends on coolant temperature. A lower coolant temperature results in higher voltage to Electro-Hydraulic Actuator (EHA). This changes control and system pressure differential to enrich fuel mixture.
Friday, September 17th, 2010 AT 2:14 AM