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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 455 (ENGINE CONTROLS - 2.2L (L61) - DTC P0201 TO DTC P0651)DTC P0300TEST DESCRIPTION
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Test Description

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Test Description
WARNING: This page is about a different car, the 2006 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 2:  If the actual CKP variation values are not within the learned values, the misfire counters may increment.
DTC P0300

Step Action Values Yes No
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
IMPORTANT: You must perform the crankshaft position (CKP) system variation learn procedure before proceeding with this diagnostic table. Refer to CKP System Variation Learn Procedure .
  1. Start the engine.
  2. Allow the engine to idle or operate within the conditions listed in the Freeze Frame/Failure Records.
  3. Monitor all of the Misfire counters with the scan tool.
Are any of the Misfire Current counters incrementing?		 - Go to Step 3  Go to Intermittent Conditions
3 Are any other DTCs set? - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Go to Step 4 
4 Can any abnormal engine noise be heard? - Go to Symptoms - Engine Mechanical in Engine Mechanical Go to Step 5 
5 Inspect the following components:
Did you find and correct the condition?		 - Go to Step 19  Go to Step 6 
6
  1. Turn OFF the ignition.
  2. Remove the fuel pump relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems.
  3. Remove the ignition coil housing assembly, keeping the ignition control (IC) module assembly connected to the harness connector. Refer to Ignition Coil Housing Replacement .
    4. IMPORTANT: Not grounding the IC module housing may cause an erratic spark.
  4. Connect a jumper wire between the top of the IC module and a good ground.
  5. Install the J 36012-A  (SA91992) Ignition System Diagnosis Harness. See Special Tools .
  6. Install a J 26792  (J 43883) Spark Tester on the #1 spark plug jumper wire. See Special Tools .
  7. Ground the #4 spark plug jumper wire. The #4 wire is the companion to #1.
  8. Crank the engine with the remaining spark plug wires connected.
  9. Repeat the above steps by installing the spark tester on #4 and grounding #1. Do the same for the #2 and the #3 spark plugs. Ensure the companion wire is grounded.
Does the spark tester spark on all cylinders?		 - Go to Step 7  Go to Electronic Ignition (EI) System Diagnosis
7
  1. Remove the spark plug from the cylinder that indicated a misfire. Refer to Spark Plug Replacement .
  2. Inspect the spark plug. Refer to Spark Plug Inspection .
Does the spark plug appear to be OK?		 - Go to Step 8  Go to Step 9 
8
  1. Exchange the suspected spark plug with another cylinder that is operating properly. Refer to Spark Plug Replacement .
  2. Operate the vehicle under the same conditions that the misfire occurred.
Did the misfire move with the spark plug?		 - Go to Step 15  Go to Step 12 
9 Is the spark plug oil or coolant fouled? - Go to Symptoms - Engine Mechanical in Engine Mechanical Go to Step 10 
10 Is the spark plug gas fouled? - Go to Step 13  Go to Step 11 
11 Did the spark plug show any signs of being cracked, worn, or improperly gapped? - Go to Step 14  Go to Step 12 
12 Perform the fuel injector coil test. Refer to Fuel Injector Coil Test .
Did you find and correct the condition?		 - Go to Step 19  Go to Symptoms - Engine Mechanical in Engine Mechanical
13 Perform the fuel system diagnosis. Refer to Fuel System Diagnosis .
Did you find and correct the condition?		 - Go to Step 16  Go to Symptoms - Engine Mechanical in Engine Mechanical
14 Replace or gap the spark plug. Refer to Spark Plug Replacement .
Did you complete the action?		 - Go to Step 16  -
15 Replace the faulty spark plug. Refer to Spark Plug Replacement .
Did you complete the replacement?		 - Go to Step 16  -
16 Was the customer's concern the malfunction indicator lamp (MIL) flashing? - Go to Step 17  Go to Step 18 
17
  1. Operate the vehicle at the specified value for 4 minutes.
  2. Operate the vehicle within the Conditions for Running the DTC P0420 as specified in the supporting text. Refer to DTC P0420 .
Does the DTC run and pass?		 2,500 RPM Go to Step 18  Go to DTC P0420 
18
  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 19 
19 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information 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.