Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.

NOTE: After each service or repair procedure has been completed, reconnect all components. Clear DTCs and repeat QUICK TEST procedures to ensure all electronic engine control systems are working properly and DTCs are no longer present.

Each valve cover gasket has a fuel injector connector that is part of the gasket. If connector is faulty, replace valve cover gasket. Perform this test when directed by QUICK TEST.

High Side Drive Outputs (Right & Left Bank)

High side driver output function is to distribute energy to correct 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 PCM in FDCS.

Low Side Drive Outputs

Low side drive outputs control sequencing (firing order) of engine, based on CID and FDCS inputs.

WARNING: Red-striped wires carry 115 volts DC. Severe electrical shock may be received. DO NOT pierce engine electrical wires or damage to harness may occur.

NOTE: Special instructions are required to clear IDM DTCs.

Detection & Management
Turn ignition on. Record IDM DTCs stored in KOEO ON-DEMAND SELF-TEST and KOEO INJECTOR ELECTRICAL SELF-TEST. Using scan tool, access RETRIEVE/CLEAR CONTINUOUS DTCs from scan tool menu to clear IDM trouble codes from memory. Record any DTCs displayed. Press CLEAR ALL button on scan tool. IDM DTCs are now cleared from memory. Repeat KOEO ON-DEMAND SELF-TEST and KOEO INJECTOR ELECTRICAL SELF-TEST. Any IDM DTCs that reappear are IDM hard faults. If no IDM DTCs reappear, then fault is intermittent.
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. A KOEO INJECTOR ELECTRICAL SELF-TEST allows operator to enable all injector solenoids while engine is off to verify operation. IDM DTCs will not be transmitted if Electronic Feedback (EF) line is not functioning. However, engine will not shut down due to a non-functional EF line. If a low side short to ground condition is determined by IDM, this condition will be transmitted to PCM via EF signal. PCM will enable CHECK ENGINE light and command minimum fuel to affected bank.

Fig 1: Identifying Injector Driver Module Circuits & Connector Terminals

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Engine Wiring Harness 42-Pin Connector Terminals (Male Side Of Connector Shown)

Courtesy of FORD MOTOR CO.