The Engine Cranks but Does Not Run diagnostic table is an organized approach to identifying a condition that causes an engine to not start. The diagnostic table directs the service technician to the appropriate system diagnosis. The diagnostic table assumes the following conditions are met:
• | The battery is completely charged. Refer to Battery Inspection/Test in Engine Electrical. |
• | The engine cranking speed is acceptable. Refer to Engine Cranks Slowly in Engine Electrical. |
• | There is adequate fuel in the fuel tank. |
Step | Action | Values | Yes | No | ||||||||||||||
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Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine 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 in Vehicle DTC Information | ||||||||||||||
2 |
Does the scan tool display DTCs P0102, P0113, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0230, P0231, P0232, P0261, P0264, P0267, P0270, P0273, P0276, P0279, P0282, P0335, P0336, P0601, P0602, P0604, P0606, P0627, P0628, P0629, P0686, P0687, P0689, P0690, P1251, P1252, P1253, P1254, P1626, P1631, or P2636? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 3 | ||||||||||||||
3 | Does the scan tool display any vehicle theft deterrent (VTD) DTCs? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | Go to Step 4 | ||||||||||||||
4 | Probe both test points of the FUEL fuse located in the underhood electrical center using a test lamp connected to a good ground. Does the test lamp illuminate on at least one test point of the fuse? | -- | Go to Step 5 | |||||||||||||||
5 | Probe both test points of the ODD INJ fuse and both test points of the EVEN INJ fuse located in the underhood fuse block using a test lamp connected to a good ground. Does the test lamp illuminate on both test points of both fuses? | -- | Go to Step 6 | |||||||||||||||
6 | Observe the engine speed parameter on the scan tool, while cranking the engine. Does the scan tool display the specified value? | 0 RPM | Go to Step 10 | Go to Step 7 | ||||||||||||||
7 |
Did the spark tester spark on all cylinders? | -- | Go to Step 8 | |||||||||||||||
8 |
Important: The engine coolant temperature (ECT) must be below the operating temperature in order to avoid irregular fuel pressure readings due to hot soak fuel boiling.
Important: The fuel pump may need to be commanded ON a few times in order to obtain the highest possible fuel pressure. Is the fuel pressure within the specified range? | 380-427 kPa (55-62 psi) | Go to Step 9 | Go to Fuel System Diagnosis | ||||||||||||||
9 |
Did you complete the action? | -- | Go to Step 16 | -- | ||||||||||||||
10 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 11 | ||||||||||||||
11 |
Did you replace the sensor? | -- | Go to Step 16 | Go to Step 12 | ||||||||||||||
12 |
Did you replace a sensor? | -- | Go to Step 16 | Go to Step 13 | ||||||||||||||
13 | Test the 12-volt reference circuits of the following components for a short to ground. Refer to Circuit Testing in Wiring Systems.
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 14 | ||||||||||||||
14 | Test for shorted terminals and poor connections at the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 15 | ||||||||||||||
15 | Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||||||||||
16 |
Does the engine start and continue to operate? | -- | Go to Step 17 | Go to Step 2 | ||||||||||||||
17 |
Are any DTCs displayed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |