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Circuit/System Description The engine control module (ECM) uses the generator turn ON signal circuit to control the load of Conditions for Running the DTC Key ON Test No generator, crankshaft position (CKP) sensors, or camshaft position (CMP) sensor DTCs The ignition is in RUN position. The engine is not running. RUN Test No generator, CKP sensors, CMP sensor DTCs are set. The engine is running. Conditions for Setting the DTC During the key ON test, the ECM detects high voltage on the generator turn on signal circuit During the RUN test, the ECM detects low voltage on the generator turn on signal circuit Action Taken When the DTC Sets The ECM will command the charge indicator and or warning message to be illuminated on The ECM will not illuminate the malfunction indicator lamp (MIL). The ECM will store conditions, which were present when the DTC set as Fail Records data Conditions for Clearing the DTC
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
A current DTC will clear when the conditions for setting the DTC are no longer met. A history DTC will clear after 40 consecutive warm-up cycles have occurred without a Reference Information Schematic Reference Starting and Charging Schematics Connector End View Reference Component Connector End Views Description and Operation Charging System Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the generator. 2. Ignition ON, test for less than 1 volt between the signal circuit terminal 1 and ground. If greater than the specified range, test the signal circuit for a short to voltage. If the 3. Engine running, test for greater than 3.5 volts between the signal circuit terminal 1 and ground. If less than the specified range, test the signal circuit for a short to ground, an open or a
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
4. If all circuit tests normal, test or replace the generator. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Generator Replacement (4.3L) or Generator Replacement (4.8L, 5.3L, 6.0L, and Control Module References for ECM replacement, setup, and programming DTC P0622 Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptor DTC P0622 Generator F-Terminal Circuit Diagnostic Fault Information Circuit/System Description The engine control module (ECM) uses the generator field duty cycle signal circuit, or F-terminal Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance Generator Field Duty Cycle P0622 P0622 P0622 -
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
the duty cycle should be between 5-95 percent. Conditions for Running the DTC The vehicle speed is greater than 8 km/h (5 mph). The system voltage is between 9.5-18 volts. Conditions for Setting the DTC The ECM detects a PWM signal greater than 65 percent for 5 seconds during the KEY ON The ECM detects a PWM signal less than 5 percent for 15 seconds during the RUN test. Action Taken When the DTC Sets The ECM will command the charge indicator to be illuminated on the instrument panel The ECM will not illuminate the malfunction indicator lamp (MIL). The ECM will store conditions, which were present when the DTC set as Fail Records data Conditions for Clearing the DTC The ECM will command the charge indicator OFF after one trip in which the diagnostic test The history DTC will clear after 40 consecutive warm-up cycles have occurred without a Reference Information Schematic Reference Starting and Charging Schematics Connector End View Reference Component Connector End Views Description and Operation Charging System Description and Operation
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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