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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1812 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC P0621 >> Conditions for Clearing the MIL/DTC

Conditions for Clearing the MIL/DTC

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0621

Step Action Values Yes No
Connector End View Reference: Engine Electrical Connector End Views , Engine Control Module Connector End Views for the engine 2.2L (L61), or Powertrain Control Module Connector End Views for the 3.5L (L66) engine
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
  3. Using the scan tool, observe the specific DTC Information for DTC P0621 until the test runs.
Does the scan tool indicate that DTC P0621 has passed this ignition cycle?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 3 
3
  1. Start the engine.
  2. With a scan tool, while observing the Generator L-Terminal parameter in the engine control module (ECM) / powertrain control module (PCM) data list, command the Generator L-Terminal Off for 5 seconds and then back on.
Does the scan tool indicate Disabled then Enabled or Inactive then Active each time the Generator L-Terminal is commanded Off and On?		 - Go to Step 6  Go to Step 4 
4
  1. Turn OFF the ignition.
  2. Disconnect the generator harness connector.
  3. Start the engine.
  4. Measure the voltage between the generator turn on signal circuit of the generator harness connector and a good ground.
Is the voltage within the specified range?		 4.5-5.5 V Go to Step 7  Go to Step 5 
5 Test the generator turn on signal circuit for a short, high resistance or open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
6 Test the generator battery voltage output circuit for a high resistance or open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Charging System Test 
7 Inspect for poor connections at the harness connector of the generator. Refer to Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Charging System Test 
8 Inspect for poor connections at the harness connector of the ECM/PCM. Refer to Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
9
IMPORTANT: The replacement ECM/PCM must be programmed.
Replace the ECM/PCM. Refer to Control Module References for replacement, setup, and programming.Did you complete the replacement?		 - Go to Step 10  -
10
  1. Review and record the scan tool Fail Records data.
  2. Use the scan tool in order to clear the DTC.
  3. Operate the vehicle within the Conditions for Running DTC P0621 as specified in the supporting text.
  4. Using the scan tool, observe the Specific DTC Information for DTC P0621 until the test runs.
Does the scan tool indicate that DTC P0621 failed?		 - Go to Step 3  System OK
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