LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 863 (Engine Controls Diagnostic (DTC P0172 To DTC P0455) -- 5.7L) >> Diagnosis >> DTC P0300-P0308 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  If the actual CKP variation values are not within the learned values, the misfire counters may increment.
  2. 3:  DTC P0135 or P0155 can be set because of a misfire.
DTC P0300

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: 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 current misfire counters incrementing?		 - Go to Step 3  Go to Diagnostic Aids
3  Are any DTCs other than P0300, P0135 or P0155 set? - Go to Diagnostic Trouble Code (DTC) List Go to Step 4 
4 Can any abnormal engine noise be heard? - Go to Base Engine Misfire without Internal Engine Noises Go to Step 5 
5 Does the scan tool indicate that the HO2S bank 1 sensor 1 or HO2S bank 2 sensor 1 voltage parameters are below the specified value? 200 mV Go to DTC P0131 or P0151 Go to Step 6 
6 Does the scan tool indicate that the HO2S bank 1 sensor 1 or HO2S bank 2 sensor 1 voltage parameters are fixed above the specified value? 900 mV Go to DTC P0132 or P0152 Go to Step 7 
7 Inspect the following components:
Did you find and correct the condition?		 - Go to Step 20  Go to Step 8 
8
  1. Turn OFF the ignition.
  2. Disconnect the spark plug wire from the spark plug that corresponds to the Misfire Current counters that were incrementing. Refer to Spark Plug Wire Replacement .
  3. Install the J 26792  Spark Tester to a good ground.
  4. Start the engine.
Does the spark jump the tester gap, and is the spark consistent?		 - Go to Step 10  Go to Step 9 
9
  1. Remove the spark plug wire for the affected cylinder. Refer to Spark Plug Wire Replacement .
  2. Inspect the spark plug wire. Refer to Spark Plug Wire Inspection .
  3. Measure the resistance of the spark plug wire with a DMM.
Is the spark plug wire resistance less than the specified value?		 700 Ω Go to Electronic Ignition (EI) System Diagnosis Go to Step 19 
10
  1. Remove the spark plug from the cylinders that indicated a misfire.
  2. Inspect the spark plug. Refer to Spark Plug Inspection .
Does the spark plug appear to be OK?		 - Go to Step 11  Go to Step 12 
11
  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 18  Go to Step 15 
12 Are the spark plugs oil or coolant fouled? - Go to Base Engine Misfire without Internal Engine Noises Go to Step 13 
13 Are the spark plugs gas fouled? - Go to Step 16  Go to Step 14 
14 Do the spark plugs show any signs of being cracked, worn, or improperly gapped? - Go to Step 17  Go to Step 15 
15 Perform the fuel injector coil test. Refer to Fuel Injector Coil Test .
Did you find and correct the condition?		 - Go to Step 20  Go to Base Engine Misfire without Internal Engine Noises
16 Perform the fuel system diagnosis. Refer to Fuel System Diagnosis .
Did you find and correct the condition?		 - Go to Step 20  Go to Base Engine Misfire without Internal Engine Noises
17 Replace or gap the spark plug. Refer to Spark Plug Replacement . If an improper gap is found, be sure to gap the spark plugs using a wire type gage.
Did you complete the replacement?		 - Go to Step 20  -
18 Replace the faulty spark plug. Refer to Spark Plug Replacement .
Did you complete the replacement?		 - Go to Step 20  -
19 Replace the faulty spark plug wire. Refer to Spark Plug Wire Replacement .
Did you complete the replacement?		 - Go to Step 20  -
20 Was the customer concern the MIL flashing? - Go to Step 21  Go to Step 22 
21
  1. Operate the vehicle at the specified value for 4 minutes.
  2. Operate the vehicle within the Conditions for Running the DTC P0420 or P0430 as specified in the supporting text. Refer to DTC P0420 or P0430 .
Does the DTC run and pass?		 2500 RPM Go to Step 22  Go to DTC P0420 or P0430 
22
  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 23 
23 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
scientia non olet · About LEMON Manuals