Inspection
| Action
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DEFINITION: The engine cranks OK, but does not start for a long time. The engine does eventually run, or may start but immediately dies.
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Preliminary Inspection
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• | Ensure the driver is using the correct starting procedure. |
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Sensor Inspection
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• | Inspect the engine coolant temperature (ECT) sensor. Use the scan tool to compare the ECT with the ambient air temperature on a cold engine. If the coolant temperature reading is more than 5 degrees more or less than the ambient air temperature
on a cold engine, inspect for a high resistance in the coolant sensor circuit or the sensor itself. |
• | Inspect the crankshaft position (CKP) sensor reluctor wheel. Remove the CKP sensor and attempt to move the reluctor wheel front to back or side to side with a probe. If there is any movement the reluctor wheel retaining bolts are loose. |
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Fuel System Inspection
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• | Inspect the fuel pressure regulator 12-volt circuit for an intermittent short to ground. Observe the FRP Command percent while cranking. A range of 85-95 percent indicates a possible short to ground condition. |
• | Inspect the fuel tank cap vent for proper operation. |
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Electrical System Inspection
| Inspect for a slow cranking speed. Refer to
Symptoms - Engine Electrical
.
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Air Intake System Inspection
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• | Inspect the air cleaner and air intake ducts for a restrictions or leaks. |
• | Inspect for a restriction in turbocharger inlet duct. |
• | Inspect for a restriction or a leak in the intake manifolds. |
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Exhaust System Inspection
| Inspect the exhaust system for a possible restriction. Refer to
Restricted Exhaust
.
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Engine Mechanical Inspection
| Inspect the engine for the following conditions:
• | Broken or weak valve springs |
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Additional Inspection
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• | Compare the scan tool data at idle with the scan tool data list. Refer to
Scan Tool Data List
. |
• | Inspect the Service Bulletins for control module software updates. |
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