Checks
| Action
|
DEFINITION: Gray or blue smoke under load, idle or start up hot or cold.
|
Preliminary Check
|
• | Make sure the customer has an actual problem. |
• | Inspect the engine oil level. |
|
Fuel System Checks
|
• | Inspect the fuel injection pump. |
• | Inspect the fuel injectors. |
|
Sensor Check
|
• | Inspect the engine coolant temperature (ECT) sensor. Use the scan tool in order to compare the ECT with the ambient air temperature (AAT) on a cold engine. If the coolant temperature reading is more than 5 degrees more or less than the AAT
on a cold engine, check for a high resistance in the coolant sensor circuit or the sensor itself. |
• | Inspect the glow plug system operation. |
• | Inspect the boost sensor operation. |
• | Inspect the BARO sensor operation. |
• | Inspect the MAF sensor operation. |
• | Inspect the fuel rail pressure (FRP) sensor. Use the scan tool to observe FRP with the engine OFF. FRP should be near 1.4 MPa. If not, inspect for high resistance in the low reference or 5-volt reference circuits or the sensor. |
|
Air Intake System Check
|
• | Inspect the air cleaner and the air intake ducts for restriction. |
• | Inspect for a restriction in the turbocharger charged air cooler. |
• | Inspect for a restriction in the intake manifold. |
• | Inspect the EGR valve operation. |
|
Engine Mechanical Check
|
• | Perform the cylinder leakage test. |
• | Perform the cylinder compression test. Proper compression is more than 2 157 kPa (313 psi). |
• | Inspect for incorrect basic engine parts such as the cam, the heads, the pistons, piston rings, and valves. |
• | Inspect for excessive oil entering the combustion chamber. |
|
Turbocharger
| Inspect for leaking seals in the turbocharger. A slight film on the intake side is normal.
|