Ford Workshop Service and Repair Manuals

Code 331 - 340: Testing and Inspection
332 - 336

NOTE

KOEO refers to Key On Engine Off (KOEO)
KOER refers to Key On Engine Running (KOER)
DTC refers to Diagnostic Trouble Code (DTC)
DTCs should be diagnosed in the order they are received.

DTC 327

Exhaust gas recirculation valve sensor circuit below minimum voltage.

KOEO Hard Code ....................................................................................................................................................................................  Go to DL1
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DL - PFE/DPFE Sensor; EVR Solenoid
Testing/DL1 - Induce DTC 337

KOER Hard Code ...................................................................................................................................................................................  Go to DL22
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DL - PFE/DPFE Sensor; EVR Solenoid
Testing/DL22 - Check PFE/DPFE Sensor Pressure Input Hose For Blockage

KOEO Memory Code .............................................................................................................................................................................  Go to DL90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DL - PFE/DPFE Sensor; EVR Solenoid
Testing/DL90 - All Continuous Memory EGR DTC: Intermittent Verification

DTC 328

Exhaust gas recirculation valve position sensor closed voltage lower than expected.

KOEO Hard Code ..................................................................................................................................................................................  Go to DN25
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DN - EGR Valve Position Sensor/EGR
Vacuum Regulator Solenoid/DN25 - Check EVP Sensor and EGR Valve Operation

KOER Hard Code ..................................................................................................................................................................................  Go to DN25
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DN - EGR Valve Position Sensor/EGR
Vacuum Regulator Solenoid/DN25 - Check EVP Sensor and EGR Valve Operation

KOEO Memory Code ............................................................................................................................................................................  Go to DN90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DN - EGR Valve Position Sensor/EGR
Vacuum Regulator Solenoid/DN90 - Check Intermittent Sensor

DTC 332

Insufficient exhaust gas recirculation flow detected.

KOER Hard Code ...................................................................................................................................................................................  Go to DL30
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DL - PFE/DPFE Sensor; EVR Solenoid
Testing/DL30 - Verify Vacuum Present At EGR Valve

KOEO Memory Code .............................................................................................................................................................................  Go to DL90
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DL - PFE/DPFE Sensor; EVR Solenoid
Testing/DL90 - All Continuous Memory EGR DTC: Intermittent Verification

DTC 334

Exhaust gas recirculation valve position sensor closed voltage higher than expected.

KOEO Hard Code ..................................................................................................................................................................................  Go to DN20
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DN - EGR Valve Position Sensor/EGR
Vacuum Regulator Solenoid/DN20 - Check For DTC 558

KOER Hard Code ..................................................................................................................................................................................  Go to DN20
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DN - EGR Valve Position Sensor/EGR
Vacuum Regulator Solenoid/DN20 - Check For DTC 558

KOEO Memory Code ..........................................................................................................................................................................  Go to DN115
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinpoint Tests/DN - EGR Valve Position Sensor/EGR
Vacuum Regulator Solenoid/DN115 - Check EGR Vacuum w/Engine Running

DTC 335