Inspection
| Action
|
DEFINITION: Gray or blue smoke under load, idle or start up hot or cold.
|
Preliminary Inspections
|
| • | Ensure the customer has an actual problem. |
| • | Check the coolant level in the reservoir. White coolant smoke may be mistaken
for blue/gray smoke. If the coolant level is low refer to
Loss of Coolant
in Engine Cooling. |
| • | Compare the scan tool data at idle with the scan tool data list. Refer
to
Scan Tool Data List
. |
|
Fuel System Inspection
|
| • | Observe the actual vs. desired fuel rail pressure with a scan tool, with
the engine running. |
|
Sensor Inspection
|
| • | Inspect the engine coolant temperature (ECT) sensor. Use the scan tool
in order 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 (FRP) with a scan tool. The actual FRP should be between 1.1-1.8 MPa.
If it is not, inspect for high resistance in the FRP sensor circuits or the FRP sensor.
Refer to
Circuit Testing
and
Wiring Repairs
in Wiring
Systems. |
|
Air Intake System Inspection
|
| • | Inspect the air cleaner and the air intake ducts for restriction. |
| • | Inspect for contamination of the mass air flow (MAF) sensor. |
| • | Inspect for a restriction in the turbocharger charged air cooler. |
| • | Inspect for a restriction in the intake manifold. |
|
Engine Mechanical Inspection
|
| • | Perform a cylinder leakage test. |
| • | Inspect for incorrect basic engine parts such as the cam, the heads, the
pistons, piston rings, and valves. |
|
Turbocharger Inspection
| Inspect for leaking seals in the turbocharger. A slight film on the intake side
is normal.
|
Inspection
| Action
|
DEFINITION: White smoke under load, idle or start up hot or cold.
|
Preliminary Inspection
|
| • | Ensure the customer has an actual problem. |
| • | Check the coolant level in the reservoir. White coolant smoke may be mistaken
for blue/gray smoke. If the coolant level is low refer to
Loss of Coolant
in Engine Cooling. |
| • | Compare the scan tool data at idle with the scan tool data list. Refer
to
Scan Tool Data List
. |
|
Fuel System Inspection
|
| • | If excessive smoke is present, inspect for a stuck open fuel injector
by performing the following procedure: |
| 1. | Remove the ignition 1 relay. |
| | Important: Do not stand in front of the glow plug holes
while cranking the engine.
|
| 3. | Crank the engine while observing the glow plug holes for fuel spray. |
| 4. | Replace the fuel injectors for the cylinders that spray fuel. |
| 5. | Inspect for contaminated oil or high oil level. Refer to
Fuel in Engine Oil
in Engine Mechanical - 6.6L. |
|
Sensor Inspection
|
| • | Inspect the engine coolant temperature (ECT) sensor. Use the scan tool
in order 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 (FRP) with a scan tool. The actual FRP should be between 1.1-1.8 MPa.
If it is not, inspect for high resistance in the FRP sensor circuits or the FRP sensor.
Refer to
Circuit Testing
and
Wiring Repairs
in Wiring
Systems. |
|
Air Intake System Inspection
|
| • | Inspect the air cleaner and the air intake ducts for restriction. |
| • | Inspect for a restriction in the turbocharger charge air cooler. |
|
Engine Mechanical Inspection
|
| • | Inspect for incorrect basic engine parts such as the cam, the heads, the
pistons, etc. |
| • | Inspect for coolant entering the combustion chamber. |
|
Inspection
| Action
|
DEFINITION: Black smoke under load, idle or start up hot or cold.
|
Preliminary Inspection
|
| • | Ensure the customer has an actual problem. |
| • | Compare the scan tool data at idle with the scan tool data list. Refer
to
Scan Tool Data List
. |
|
Fuel System Inspection
|
| • | Observe the actual vs. desired fuel rail pressure with a scan tool, with
the engine running. |
|
Sensor Inspection
|
| • | Inspect the engine coolant temperature (ECT) sensor. Use the scan tool
in order 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 (FRP) with a scan tool. The actual FRP should be between 1.1-1.8 MPa.
If it is not, inspect for high resistance in the FRP sensor circuits or the FRP sensor.
Refer to
Circuit Testing
and
Wiring Repairs
in Wiring Systems. |
|
Air Intake System Inspection
|
| • | Inspect for a restriction in the air cleaner or the air intake ducts. |
| • | Inspect for a restriction in the turbocharger charge air cooler. |
| • | Inspect for a restriction in the intake manifold. |
| • | Inspect for an air leak in the charge air cooler with a J 46091
Charge Air Cooler Tester. |
| • | Inspect for an air leak in the air ducts between the turbocharger and
the intake manifold. |
|
Engine Mechanical Inspection
|
| • | Inspect for incorrect basic engine parts such as the cam, the heads, the
pistons, etc. |
| • | Inspect for excessive oil entering the combustion chamber. Refer to
Oil Consumption Diagnosis
in Engine Mechanical -
6.6L (LLY). |
|
