Pinpoint Test Ab: Injector Drive Circuit Operation: Description
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Perform this test when directed here by QUICK TEST. Injector Driver Module (IDM) is capable of detecting individual injector open and shorts to either ground or power while engine is running. IDM is also capable of detecting right or left bank high side circuit opens or shorts to ground.
- High Side Drive Outputs (Right & Left Bank)
High side driver output function is to distribute energy to proper bank based on cylinder identification (CID) and provide regulated current to unit injectors, based on fuel delivery command signal (FDCS) from Injector Driver Module (IDM) internal 115-volt supply. Injection timing and duration is commanded by Powertrain Control Module (PCM) in FDCS. - Low Side Drive Outputs
Low side drive outputs control sequencing (firing order) of engine based on CID and FDCS inputs.
NOTE:
Each valve cover gasket has 2 fuel injector connectors that are part of the gasket. Each connector is responsible for 2 fuel injectors. If connector is faulty, replace valve cover gasket.