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HOMESERVICE MANUALSCHEVROLET2005OPTRA5 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - 1.8L (L79) - DTC P0106 TO DTC P0300DTC P0300TEST DESCRIPTION
2005 Chevrolet Optra5 Base, Standard

Test Description

2005 Chevrolet Optra5 Base, StandardSECTION Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step determines if there is a current misfire condition. The scan tool will display increasing counts in the Total Misfire Current Counter parameter if a misfire is occurring.
  1. 3:  If the Total Misfire Current Counter parameter is incrementing, but the engine is NOT misfiring, this could be caused by an excessive vibration from other sources than the engine.
  1. 4:  If the actual CKP variation values are not within the learned values, the Total Misfire Current Counter parameter may increment.
Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 
IMPORTANT: A misfire may only occur when the engine is under a load. An engine load may be necessary to verify the condition.
  1. Turn ON the ignition, with the engine OFF.
  2. Clear the DTCs with a scan tool.
  3. Start the engine.
  4. Monitor the Misfire Current Cylinder parameters with a scan tool.
Are any of the Misfire Current Cylinder counters incrementing?		 - Go to Step 4  Go to Step 3 
3 
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn the ignition OFF for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 4  Go to Diagnostic Aids
4  Is the engine misfiring? - Go to Step 5  Go to CKP System Variation Learn Procedure
5 Are DTCs P0201, P0202, P0203, P0204, P0317, P0336, P0337, P0341, P0342, P0351, or P0352 set? - Go to Diagnostic Trouble Code (DTC) List Go to Step 6 
6 Is there an abnormal engine noise? - Go to Symptoms - Engine Mechanical in Engine Mechanical - 1.8L (L79) Go to Step 7 
7 Is there more than one cylinder specific misfire DTC set? - Go to Step 8  Go to DTC P0301-P0304
8 Are there any heated oxygen sensor (HO2S) DTCs Set? - Go to Diagnostic Trouble Code (DTC) List Go to Step 9 
9 Inspect the following components:
Did you find and correct the condition?		 - Go to Step 10  Go to Symptoms - Engine Mechanical in Engine Mechanical - 1.8L (L79)
10
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 11 
11 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.