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F–150 ON-BOARD DIAGNOSTIC DTC P0550 A6E397001087W06 Diagnostic procedure DTC P0550 PSP switch circuit malfunction DETECTION CONDITION • PCM monitors PSP switch signal at PCM terminal 1Z. If input voltage is low (switch stays on) for 1 minute when VSS is above 60 km/h {37.3 mph} and ECT is above 60 °C {140 °F}, PCM determines that PSP switch circuit has malfunction. Diagnostic support note • This is a continuous monitor (CCM). • MIL illuminates if PCM detects the above malfunction conditions in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA is available. • DTC is stored in PCM memory. POSSIBLE CAUSE • PSP switch malfunction • Connector or terminal malfunction • Short to ground in wiring between PSP switch terminal and PCM terminal 1Z • Open circuit in wiring between PSP switch terminal and PCM terminal 1Z • PCM malfunction STEP INSPECTION ACTION 1 VERIFY FREEZE FRAME DATA HAS BEEN • Has FREEZE FRAME DATA been recorded? Yes Go to next step. No Record FREEZE FRAME DATA on repair order, then go to 2 VERIFY RELATED SERVICE INFORMATION • Check for related Service Information availability. • Is any related Service Information available? Yes Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to next step. No Go to next step. 3 INSPECT POOR CONNECTION OF PSP • Turn ignition key to OFF. • Disconnect PSP connector. • Inspect for poor connection (damaged, pulled- out terminals, corrosion, etc.). • Are there any malfunctions? Yes Repair or replace terminal, then go to Step 8. No Go to next step. |