Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection– ECM Programming Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0657 FORD Description The ECM has detected an

Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection– Shorted sensor on 5 volt circuit When is the code detected? The Engine Control Module (ECM) has detected the sensor 5

Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection– Shorted sensor on 5 volt circuit When is the code detected? The Engine Control Module (ECM) has detected the sensor 5

Possible causes – Faulty Engine Control Module (ECM)– Engine Control Module (ECM) Harness power supply circuit is open or shorted– Engine Control Module (ECM) Programming Tech notes Check the ECM fuse, if fuse is OK try erasing the code first

Possible causes – Faulty Engine Fuel Temperature Sensor– Engine Fuel Temperature Sensor harness is open or shorted– Engine Fuel Temperature Sensor circuit poor electrical connection When is the code detected? An excessively high or low voltage is sent to Powertrain

Possible causes – Faulty Engine Fuel Temperature Sensor– Engine Fuel Temperature Sensor harness is open or shorted– Engine Fuel Temperature Sensor circuit poor electrical connection When is the code detected? An excessively high or low voltage is sent to Powertrain

Possible causes – Faulty Engine Fuel Temperature Sensor– Engine Fuel Temperature Sensor harness is open or shorted– Engine Fuel Temperature Sensor circuit poor electrical connection When is the code detected? An excessively high or low voltage is sent to Powertrain

Possible causes – Faulty Engine Fuel Temperature Sensor– Engine Fuel Temperature Sensor harness is open or shorted– Engine Fuel Temperature Sensor circuit poor electrical connection When is the code detected? An excessively high voltage is sent to Powertrain Control Module

Possible causes – Faulty Engine Fuel Temperature Sensor– Engine Fuel Temperature Sensor harness is open or shorted– Engine Fuel Temperature Sensor circuit poor electrical connection When is the code detected? An excessively low voltage is sent to Powertrain Control Module

Possible causes – Faulty Engine Fuel Temperature Sensor– Engine Fuel Temperature Sensor harness is open or shorted– Engine Fuel Temperature Sensor circuit poor electrical connection When is the code detected? An excessively high voltage is sent to Powertrain Control Module

Possible causes – Faulty Engine Fuel Temperature Sensor– Engine Fuel Temperature Sensor harness is open or shorted– Engine Fuel Temperature Sensor circuit poor electrical connection When is the code detected? An excessively low voltage is sent to Powertrain Control Module

Possible causes – Faulty Engine Oil Temperature sensor– Engine Oil Temperature sensor harness is open or shorted– Engine Oil Temperature sensor circuit poor electrical connection When is the code detected? The P0197 indicates the Engine Oil Temperature Sensor signal voltage

Possible causes – Faulty Engine Oil Temperature sensor– Engine Oil Temperature sensor harness is open or shorted– Engine Oil Temperature sensor circuit poor electrical connection When is the code detected? The P0198 indicates the Engine Oil Temperature Sensor signal voltage

Possible causes – Faulty Engine Oil Temperature sensor– Engine Oil Temperature sensor harness is open or shorted– Engine Oil Temperature sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0196 FORD Description The

Possible causes – Faulty Evaporative Emission (EVAP) Purge Solenoid Control– Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted– Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection When is the code detected? – An improper voltage

Possible causes – Faulty Evaporative Emission System (EVAP) Pressure sensor– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection When is the code detected? An excessively high voltage

Possible causes – Faulty Evaporative Emission System (EVAP) Pressure sensor– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection When is the code detected? An excessively low voltage

Possible causes – Faulty Evaporative Emission System (EVAP) Pressure sensor– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection When is the code detected? An intermitten voltage from

Possible causes – Faulty Evaporative Emission System (EVAP) Pressure Sensor– Evaporative Emission System (EVAP) Pressure sensor harness is open or shorted– Evaporative Emission System (EVAP) Pressure sensor circuit poor electrical connection– Faulty Engine Control Module (ECM) Tech notes There is

Possible causes – Faulty Evaporator Temperature sensor– A/C evaporator temperature sensor harness is open or short– A/C evaporator temperature sensor circuit poor electrical connection When is the code detected? The Powertrain Control Moduel (PCM) has detected a fault in the