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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1039 (Battery, Charging System And Starting System Diagnosis (DTC B1327-DTC P1638)) >> Diagnosis >> DTC P0622 (Gas Engine) >> Conditions for Clearing the DTC

Conditions for Clearing the DTC

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0622 (Gas Engine)

Step Action Value(s) Yes No
Schematic Reference: Starting and Charging Schematics (Except HP2) or Starting and Charging Schematics (HP2)
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 engine data list.
Does the scan tool indicate that the GEN - F Terminal parameter is within the specified range?		 5-95% Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Turn ON the ignition, leaving the engine OFF.
  2. Connect a test lamp to battery positive voltage and repeatedly probe the generator field duty cycle signal circuit or F- Terminal in the harness connector while monitoring the Generator F-Terminal Signal on the scan tool.
Is the Generator F-Terminal Signal display affected?		 - Go to Step 5  Go to Step 4 
4 Test the generator field duty cycle signal circuit for a short or open. Refer to Circuit Testing andWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  Go to Step 6 
5 Inspect for poor connections at the harness connector of the generator. Refer to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  Go to Charging System Test (CS/AD/SI Generators)
6 Inspect for poor connections at the harness connector of the PCM/ECM. Refer to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 8  Go to Step 7 
7
IMPORTANT: The replacement PCM/ECM must be programmed.
Replace the PCM/ECM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls-4.3L, Powertrain Control Module (PCM) Replacement in Engine Controls-4.8L, 5.3L, and 6.0L, or Powertrain Control Module (PCM) Replacement in Engine Controls-8.1L, or Engine Control Module (ECM) Replacement in Engine Controls-6.6L.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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