Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. 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.

8: The crankshaft position (CKP) sensor can fail in such a way that will cause the engine to crank but will not run. The engine will be able to run by using the cam sensor when the CKP sensor is disconnected.

Engine Cranks but Does Not Run

Step	Action	Value(s)	Yes	No
1	Did you perform the Diagnostic System Check-Engine Controls?	-	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Turn ON the ignition, with the engine OFF. With a scan tool, observe the DTC information. Does the scan tool display DTCs P0068, P0107, P0601, P0602, P0604, P0606, P0607, P0651, P1621, P1631, P1680, P1681, or P1682?	-	Go to Diagnostic Trouble Code (DTC) List	Go to Step 3
3	Does the scan tool display any body control module (BCM) vehicle theft deterrent (VTD) DTCs?	-	Go to Diagnostic Trouble Code (DTC) List in Theft Deterrent	Go to Step 4
4	Command the fuel pump ON with a scan tool. Does the fuel pump turn ON?	-	Go to Step 5	Go to Fuel Pump Electrical Circuit Diagnosis
5	Turn OFF the ignition. Remove an ignition coil. Refer to Ignition Coil(s) Replacement . Install the J 26792 Spark Tester to the coil boot. Attempt to start the engine. Does the spark tester spark?	-	Go to Step 6	Go to Electronic Ignition (EI) System Diagnosis
6	Turn OFF the ignition. Disconnect the multi-way harness connector of the fuel injectors. Connect a test lamp between the ignition 1 voltage circuit of the fuel injector, fuse side, and a fuel injector control circuit, powertrain control module (PCM) side. Crank the engine. Does the test lamp flash when cranking the engine?	-	Go to Step 7	Go to Fuel Injector Circuit Diagnosis
7	Turn OFF the ignition. Install the J 34730-1A Fuel Pressure Gage. Refer to Fuel Pressure Gage Installation and Removal . Turn ON the ignition, with the engine OFF. Command the fuel pump ON with a scan tool. Is the fuel pressure within the specified range while the fuel pump is operating?	334-375 kPa (48-54 psi)	Go to Step 8	Go to Fuel System Diagnosis
8	Disconnect the crankshaft position (CKP) sensor. Attempt to start the engine. Does the engine start and continue to run?	-	Go to Step 10	Go to Step 9
9	Inspect for the following conditions: A collapsed air intake duct A restricted air filter element-Refer to Air Cleaner Element Replacement . Contaminated fuel-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool) or Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool) . The spark plugs for being gas or coolant fouled-Refer to Spark Plug Inspection . If the spark plugs are fouled, determine what caused the condition. An engine mechanical condition (worn timing chain, gears and low compression)-Refer to Symptoms - Engine Mechanical in Engine Mechanical. A restricted exhaust system-Refer to Restricted Exhaust in Engine Exhaust. An engine coolant temperature (ECT) sensor that has shifted in value. Refer to Temperature vs Resistance . Compare MAP/BARO parameters to another vehicle. The parameters should be close in value. Refer to DTC P0106 . Did you complete the action?	-	Go to Step 11	-
10	Replace the CKP sensor. Refer to Crankshaft Position (CKP) Sensor Replacement . Did you complete the replacement?	-	Go to Step 11	Go to Step 2
11	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Attempt to start the engine. Does the engine start and continue to run?	-	Go to Step 12	Go to Step 2
12	Allow the engine to reach operating temperature. Observe the DTC information with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List	System OK