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Engine Cranks but Does Not Run: Description

The Engine Cranks but Does Not Run diagnostic table is an organized approach to identifying a condition that causes an engine not to start. The Engine Cranks but Does Not Run diagnostic table directs the service technician to the appropriate system diagnosis.

The Engine Cranks but Does Not Run diagnostic table assumes the following:

Engine Cranks but Does Not Run

Step Action Value(s) 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 Does the scan tool display any U-XXX DTCs ? - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Go to Step 3 
3
  1. Turn ON the ignition, with the engine OFF.
  2. Observe the DTC Information with a scan tool.
Does the scan tool display DTCs P0102, P0103, P0201-P0206, P0335, P601, P0602, P0603, P0604, P0606, P0628, P0629, P1630, P1631, P1632?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Go to Step 4 
4 Does the scan tool display any body control module (BCM) vehicle theft deterrent (VTD) DTCs? - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Go to Step 5 
5
  1. Turn ON the ignition with the engine OFF.
  2. Probe the BCM/ECM/Cruise fuse with a test lamp that is connected to a good ground.
Does the test lamp illuminate on at least one side of the fuse?		 - Go to Step 6  Go to Step 7 
6 With the ignition switch in the CRANK position, probe the BCM/ECM/Cruise fuse with a test lamp that is connected to a good ground.
Does the test lamp illuminate on at least one side of the fuse while cranking the engine?		 - Go to Step 9  Go to Step 8 
7
CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
  1. Turn the ignition OFF.
  2. Remove the battery feed wire from the fuse block.
  3. Push in the tabs at the end of the fuse block case. Roll back the fuse block to gain access to the fuse block connectors.
  4. Jumper the battery feed to the fuse block. Turn ON the ignition with the engine OFF.
  5. Probe the ignition 1 voltage circuit at the underhood fuse block connector C3 E9 with a test lamp that is connected to a good ground. Refer to Power and Grounding Connector End Views in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 14  Go to Step 13 
8
CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
  1. Turn OFF the ignition.
  2. Remove the battery feed wire from the fuse block.
  3. Push in the tabs at the end of the fuse block case. Roll back the fuse block to gain access to the fuse block connectors.
  4. Jumper the battery feed to the fuse block.
  5. With the ignition switch in the crank position, probe the ignition 1 voltage circuit at the underhood fuse block connector C3 E9 with a test lamp that is connected to a good ground. Refer to Power and Grounding Connector End Views in Wiring Systems.
Does the test lamp illuminate while cranking the engine?		 - Go to Step 14  Go to Step 13 
9 Command the fuel pump ON with a scan tool.
Does the fuel pump operate?		 - Go to Step 10  Go to Fuel Pump Electrical Circuit Diagnosis 
10
  1. Turn OFF the ignition.
  2. Remove both ignition control modules, keeping the ignition control module assembly connected to the harness connector. Refer to Ignition Control Module Replacement - Bank 1 and Ignition Control Module Replacement - Bank 2 .
  3. Install a J 26792  (SA9199Z) Spark Tester on the #1 spark plug boot. See Special Tools . Ensure the clamp end of the spark tester is connected to a good engine ground.
  4. Perform the ignition coil cylinder 1 test with a scan tool.
  5. Repeat steps 3 and 4 for the remaining cylinders
Does the spark tester spark on all cylinders?		 - Go to Step 11  Go to Electronic Ignition (EI) System Diagnosis 
11
  1. Turn OFF the ignition.
  2. Install a SA9127E  Gage Bar Set. 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?		 268-338 kPa (39-49 psi) Go to Step 12  Go to Fuel System Diagnosis 
12 Inspect for the following conditions:
Did you complete the action?		 - Go to Step 18  -
13 Test the affected circuit between the underhood fuse block and the ignition switch for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 15 
14 Test for an intermittent and for a poor connection at the underhood block. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 16 
15 Test for an intermittent and for a poor connection at the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 18  Go to Step 17 
16 Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.
Did you complete the replacement?		 - Go to Step 18  -
17 Replace the ignition switch. Refer to Ignition Switch Replacement in Steering Wheel and Column.
Did you complete the replacement?		 - Go to Step 18  -
18
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Attempt to start the engine.
Does the engine start then continue to run?		 - Go to Step 19  Go to Step 2 
19
  1. Allow the engine to reach operating temperature.
  2. 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 in Vehicle DTC Information System OK
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