thanks i aiso have 14 other codes + p0620

Asked by Apr 04, 2017 at 11:01 PM about the 2004 Ford F-250 Super Duty Lariat 4WD Crew Cab SB

Question type: Maintenance & Repair

1 Answer

74,645

P0620 FORD - Generator Control Circuit...Possible causes; Battery charge, Faulty Generator, Generator harness is open or shorted, Generator circuit poor electrical connection, Engine Control Module (ECM) controlled generator, Faulty ECM...The Engine Control Module (ECM) has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this P0620 code will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the ECM to set the P0620 code. Possible symptoms; Engine Light ON (or Service Engine Soon Warning Light) P0620 FORD Description; The Engine Control Module (ECM) uses the generator turn on signal circuit to control the generator. A high side driver within the ECM allows the ECM to turn the generator ON and OFF. When Generator operation is desired, the ECM sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the ECM, the voltage regulator controls generator output independently of the ECM. Under certain operating conditions, the ECM can turn Off the generator by turning Off the 5 volt signal on the generator, turn on signal circuit.

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