Inspection
| Action
|
DEFINITION: The engine cranks OK, but does not start for a long time. The engine
does eventually run, or may start but immediately dies.
|
Preliminary Inspection
|
• | Ensure the driver is using the correct starting procedure. |
|
Sensor Inspection
|
• | 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. |
• | Turn ON the ignition with the engine OFF. Observe the actual fuel rail
pressure with a scan tool. The actual fuel rail pressure should be between 1.0-1.8 MPa.
If it is not, inspect for high resistance in the fuel rail pressure (FRP) sensor circuits
or the FRP sensor. Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems. |
• | 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. |
|
Fuel System Inspection
|
• | 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. |
|
Electrical System Inspection
| Inspect for a slow cranking speed. Refer to
Symptoms - Engine Electrical
in Engine Electrical.
|
Air Intake System Inspection
|
• | 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. |
|
Exhaust System Inspection
| Inspect the exhaust system for a possible restriction. Refer to
Restricted Exhaust
in Engine Exhaust.
|
Engine Mechanical Inspection
| Inspect the engine for the following conditions:
• | Broken or weak valve springs |
|
Additional Inspection
|
• | 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. |
|