Ford Workshop Service and Repair Manuals

Start

KOEO Memory Code .................................................................................................................................................................................  Go to J90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/J - Fuel Pump Circuit/J90 - Check EEC-IV
Harness

DTC 543

Fuel pump secondary circuit failure

KOEO Hard Code ......................................................................................................................................................................................  Go to J20
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/J - Fuel Pump Circuit

KOEO Memory Code .................................................................................................................................................................................  Go to J93
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/J - Fuel Pump Circuit/J93 - Check For DTC
556

DTC 552

Secondary Air Injection Bypass circuit failure during KOEO self-test.

KOEO Hard Code ....................................................................................................................................................................................  Go to KC9
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/KC - Secondary Air Injection
Solenoids/KC9 - Check Voltage of VPWR Circuit

DTC 553

Secondary Air Injection Diverter circuit failure during KOEO self-test.

KOEO Hard Code ....................................................................................................................................................................................  Go to KC9
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/KC - Secondary Air Injection
Solenoids/KC9 - Check Voltage of VPWR Circuit

DTC 554

Fuel Pressure Regulator Control circuit failure.

KOEO Hard Code ....................................................................................................................................................................................  Go to KN1
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/KN - Fuel Pressure Regulator Control
Solenoid/KN1 - DTC 554, Enter Output State Diagnostic Test Mode