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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1851 (Engine Controls And Fuel - 3.5L (L66) - Troubleshooting & Diagnosis) >> Engine Cranks but Does Not Run >> Test Description

Test Description

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.

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

  1. 1:  The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
  2. 2:  The listed DTCs can cause a no start. If a DTC is set, diagnose the DTC before using this diagnostic procedure.
  3. 3:  A theft deterrent system condition may cause a no start. If a theft deterrent DTC is set, diagnose the DTC before using this diagnostic procedure.
  4. 4:  If a CKP sensor is disconnected, a no start condition occurs without setting a DTC. If there is a condition with both CKP sensor circuits, a no start condition occurs without setting a DTC.
  5. 7:  This step verifies if there is any fuel pressure. If there is no fuel pressure, the fuel system diagnosis must be performed.
  6. 9:  This step verifies if the engine will start and run. The repair that may have led to this step may only have been a secondary cause of the no start condition, such as fouled spark plugs. The diagnostics in this table may need to be performed a second time in order to discover the root cause of the no start condition.
Engine Cranks but Does Not Run

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1  Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Crank the engine over for 15 seconds.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the DTC information with a scan tool.
Does the scan tool display DTC P0118, P0201, P0202, P0203, P0204, P0205, P0206, P0602, P1621, P1630, or P1631?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 3 
3  Observe the theft deterrent DTC information with a scan tool.
Does the scan tool display any theft deterrent DTCs?		 - Go to Symptoms - Theft Deterrent Go to Step 4 
4  Crank the engine over for 10 seconds, while you observe the engine speed parameter with a scan tool.
Is engine speed displayed on the scan tool?		 - Go to Step 5  Go to Electronic Ignition (EI) System Diagnosis 
5
  1. Remove an ignition coil from bank 1 of the engine. Refer to Ignition Coil Replacement - Bank 1 .
  2. Connect the ignition coil electrical connector.
  3. Install the J 26792  Spark Tester to the ignition coil boot.
  4. Observe for a crisp, blue spark while cranking the engine.
  5. Remove an ignition coil from bank 2 of the engine. Refer to Ignition Coil Replacement - Bank 2 .
  6. Repeat steps 2-4 for the bank 2 ignition coil.
Was there a crisp blue spark for both ignition coils tested?		 - Go to Step 6  Go to Electronic Ignition (EI) System Diagnosis 
6 Command the fuel pump ON with a scan tool. Refer to Scan Tool Output Controls .
Does the fuel pump turn ON?		 - Go to Step 7  Go to Fuel Pump Electrical Circuit Diagnosis 
7 
  1. Turn OFF the ignition.
  2. Install the SA9127E  Fuel Pressure Gage. Refer to Fuel Pressure Gage Installation and Removal .
  3. Turn ON the ignition, with the engine OFF.
  4. Command the fuel pump ON with a scan tool.
Is the fuel pressure within the specified range while the fuel pump is operating?		 330-382 kPa (48-56 psi) Go to Step 8  Go to Fuel System Diagnosis 
8 Inspect for the following conditions:
Did you complete the action?		 - Go to Step 9  -
9 
  1. With a scan tool, clear the DTCs.
  2. Attempt to start the engine.
Does the engine start and continue to operate?		 - Go to Step 10  Go to Step 2 
10
  1. Idle the engine.
  2. Allow the engine to reach operating temperature.
  3. Observe the DTC information with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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