Check For An Active Or Intermittent Condition

Checking for an active DTC or condition:  Read and record all DTCs and Freeze Frame Data. Run and save a vehicle scan report for alter use if needed. Review the Freeze Frame data, When Monitored and Set Conditions. Erase all DTCs and operate the vehicle or system in accordance with the these conditions attempting to duplicate the DTC or condition. If a DTC returns, or the condition is present continue with the diagnostic procedure. If the DTC or condition is not present, review the Intermittent Condition Testing information.

Intermittent Condition Testing:  A DTC can be stored for any number of reasons. If a DTC is not active review and check the following items below;

1. Since the FPCM monitors the Fuel Pump circuits and motor for excessive current draw and over temperature conditions,  it is possible that the pump may need to run for an extended period for the condition to be present.
2. Electronic Control Modules can be affected by temperature or software issues. Always check for any flash updates that may be related to the DTC or failure mode before continuing to diagnose an intermittent condition.
3. Poor wiring harness connections are a big contributor to intermittent electrical connections. Always check for any Service Bulletins that may apply to the DTC or failure mode before continuing to diagnose an intermittent condition. If no bulletins apply, check for connection issues by wiggle testing any wiring harnesses and in-line connectors the circuitry passes through. A good practice is too watch for a DTC to become active or scan tool data to change. An even better method is to attach a lab scope to the circuitry and wiggle test the wiring. Review the scope pattern looking for intermittent opens in the circuitry during the wiggle test. Poor battery system voltage or poor ground connections can affect systems in different or odd ways. Check the battery or batteries for proper charge and operation along with proper connections. Use the wiring information to identify and check any chassis ground connections related to the systems or components being diagnosed. Verify that connectors are locked in properly at the components, modules and any in-line connectors in the system. Look for pushed out, corroded, spread, burnt, or broken terminals at each connector.
4. Mechanical and electrical components can fail intermittently due to temperature changes or vibration during driving. Operate the components through a full range of operation while monitoring functionality.