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Conditions for Clearing the DTC

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0622

Step Action Value(s) Yes No
Schematic Reference: Starting and Charging Schematics 
Connector End View Reference:  Engine Electrical Connector End Views  
1 Did you perform the Engine Electrical Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Engine Electrical 
2
  1. Install a scan tool.
  2. Start the engine.
  3. With a scan tool, observe the GEN - F Terminal parameter in the PCM data list.
Does the scan tool indicate that the GEN - F Terminal parameter is within the specified range?		 5-95% Go to Step 3  Go to Step 4 
3 With the scan tool command the generator OFF.
Does the GEN - F Terminal equal the specified value?		 0% Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems Go to Step 4 
4
  1. Turn OFF the ignition.
  2. Disconnect the generator connector.
  3. Connect test lamp to battery positive voltage.
  4. Turn ON the ignition, with the engine OFF.
  5. Probe the F-Terminal in the generator connector.
  6. Observe the GEN - F Terminal Signal parameter in the PCM data list.
Is the GEN - F Terminal Signal parameter near the specified value?		 100% Go to Charging System Test  Go to Step 5 
5 Test the generator field duty cycle signal circuit for a short or open. Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  Go to Step 6 
6 Inspect for poor connections at the harness connector of the PCM. Refer to CONNECTOR REPAIRS in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  Go to Step 7 
7 Replace the PCM. Refer to POWERTRAIN CONTROL MODULE
Did you complete the repair?		 - Go to Step 8  -
8
  1. Review and record the scan tool Fail Records data.
  2. Clear any DTCs.
  3. Operate the vehicle within the Fail Records conditions as noted.
  4. Using a scan tool, monitor the Specific DTC info for this DTC.
Does the scan tool indicate that this DTC failed this ignition?		 - Go to Step 2  System OK
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