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Chart 9

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SYSTEM/COMPONENT REFERENCE ( PINPOINT TESTS - 6.0L DIESEL unless noted)
Preliminary Checks CARRY OUT preliminary checks. GO to DIAGNOSTIC SUBROUTINES PERFORMANCE DIAGNOSTIC PROCEDURES . CARRY OUT steps 1-4. VERIFY any concerns.
Atmospheric Pressure Rationality Check GO to DIAGNOSTIC METHODS PARAMETER IDENTIFICATION (PID) . With KOEO, SELECT Parameter Identification (PID). SELECT PIDs: EP, MAP and BARO. If any PID values/readings deviate from atmospheric pressure in your locale by more than 10 kPa (1.5 psi), GO to the appropriate pinpoint test for the sensor with the largest difference.
Check Color Of Exhaust Smoke
NOTE: Some white tailpipe exhaust smoke is a normal condition at start-up with temperatures below 10°C (50°F) or with an extended idle in a cool climate.
START the engine. If the exhaust smoke is white, GO to the next step. If the exhaust smoke is black, CHECK for charge air cooler restrictions.
Check White Tailpipe Exhaust Smoke CARRY OUT the GLOW PLUG SYSTEM OPERATION Test.
Check Charge Air Cooler (CAC) for Restrictions CHECK for any conditions that may restrict air flow through the charge air cooler. DISCONNECT the ducts at the CAC and CHECK for restrictions. CHECK inside of the CAC for restrictions. If there are any restrictions, CLEAN as necessary. VERIFY the repair.
Confirm Fuel Quality If the concern is present, DRAIN the fuel tank. ADD known high quality diesel fuel to tank. If the amount of smoke is decreased, ADVISE the operator of need for a higher quality fuel.
Check For Out-of-Range Sensor  
NOTE: Make sure the vehicle temperature is stabilized. SOAK the vehicle at ambient temperature for at least 8 hours. Verify no accessories are in use (engine block or oil heaters).

CHECK the operation of: intake air temperature (IAT) sensor, manifold air temperature (MAT) sensor, engine oil temperature (EOT) sensor and engine coolant temperature (ECT) sensor. If the sensor temperature readings are not within 12 degrees, REFER to the applicable pinpoint test in PINPOINT TESTS - 6.0L DIESEL .
Check For Coolant Leak REFER to ENGINE COOLING .
Check Thermostat Operation REFER to ENGINE COOLING .
Isolate Engine Cylinders Generating Smoke
NOTE: When the vehicle is assembled, gaskets are not installed between the cylinder head and the exhaust manifold. If the exhaust manifold is separated from the cylinder head, gaskets must be installed.
REMOVE the exhaust manifold attaching bolts. PRY the manifolds away from the cylinder head. START the engine. If a cylinder is generating excessive smoke, CHECK the compression. If not, TEST the glow plug(s).
Check Crankcase Pressure CARRY OUT the CRANKCASE PRESSURE TEST .
Test Glow Plug REMOVE the glow plug from the smoking cylinder. GROUND the body of the glow plug and INSTALL a jumper wire from the B+ source to the glow plug terminal. If the glow plug tip does NOT become hot, INSTALL a new glow plug. VERIFY the repair.
Switch Fuel Injectors SWITCH injector(s) between a smoking and non-smoking cylinder(s). If the smoke moves with the injector(s), INSTALL new injector(s). VERIFY the repair. If not, REFER to ENGINE - 6.0L DIESEL .
Black Smoke Check for air in the fuel. Test with a clear line at the pump inlet. REFER to FUEL TANK AND LINES for removing fuel lines.
Check EGR Operation CARRY OUT EXHAUST GAS RECIRCULATION (EGR) POSITION Test.
Check Mass Air Flow Performance GO to Pinpoint Test J .