DTC P01CB-P01CF or P01D0-P01D6

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5398751 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P01CB Cylinder 1 Fuel Injection Timing Retarded DTC P01CC Cylinder 1 Fuel Injection Timing Advanced DTC P01CD Cylinder 2 Fuel Injection Timing Retarded DTC P01CE Cylinder 2 Fuel Injection Timing Advanced DTC P01CF Cylinder 3 Fuel Injection Timing Retarded DTC P01D0 Cylinder 3 Fuel Injection Timing Advanced DTC P01D1 Cylinder 4 Fuel Injection Timing Retarded DTC P01D2 Cylinder 4 Fuel Injection Timing Advanced DTC P01D3 Cylinder 5 Fuel Injection Timing Retarded DTC P01D4 Cylinder 5 Fuel Injection Timing Advanced DTC P01D5 Cylinder 6 Fuel Injection Timing Retarded DTC P01D6 Cylinder 6 Fuel Injection Timing Advanced Circuit/System Description For an overview of the component/system, refer to: Fuel System Description

Circuit	Description
Control — Terminal 1	The output circuit is switched to 50 V to activate the component.
Control — Terminal 2	The output circuit is switched to ground to activate the component.

	Component	Description
	K20 Engine Control Module	The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of

Component	Description
	sensors, interprets the data and adjusts the engine actuators accordingly.
Q17 Fuel Injector	Fuel injectors are solenoid valves that inject fuel either into the intake system or directly into the cylinder. The amount of fuel injected depends on the length of the electrical pulse that is applied.

To minimize engine vibrations at idle the engine control module can detect even small variations in engine speed and compensates these variations by adjusting the amount of injected fuel for each cylinder individually. This smooth-running control works only inside calibrated limits. Values that differ too much indicate that the injector is not working properly or that something is mechanically wrong with the cylinder. Fuel quantity based on the time the injector was turned on. Fuel quantity based on the increase in crankshaft speed when a specific cylinder fires. Conditions for Running the DTC P01CB DTC P01CC = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01CC DTC P01CB = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01CD DTC P01CE = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01CE DTC P01CD = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01CF DTC P01D0 = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01D0 DTC P01CF = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01D1 DTC P01D2 = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01D2 DTC P01D1 = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01D3 DTC P01D4 = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01D4 DTC P01D3 = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01D5 DTC P01D6 = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met P01D6 DTC P01D5 = Not set Ambient Air Temperature = Warmer than −9°C (15.8°F) BARO Sensor 2 = Greater than 70 kPa (10.2 PSI) Deceleration Fuel Cut-Off = Active — Greater than 20 s — Deceleration time is cumulative Engine Coolant Temperature Sensor = 68 to 126°C (154.4 to 258.8°F) Engine Speed = 1100 to 1750 RPM Fuel Temperature Sensor = 5 to 80°C (41 to 176°F) Low Fuel Indicator = Off Transmission = Gear 4, 5, 6 Frequency the DTC runs = Once — Per drive cycle — After the running conditions are met Conditions for Setting the DTC Fuel Injection Quantity or Fuel Injection Timing = Out Of Range Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Special Tools CH-51450-A Oscilloscope Diagnostic Kit CH-51450-LEAD-A Oscilloscope Basic Lead Kit Equivalent regional tools: Special Tools Circuit/System Verification

1. Verify no other DTCs are set. ⇒ If any other DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If no other DTCs are set
2. Verify the following conditions do not exist: Fuel Type — Incorrect » Refer to: Fuel System Specifications Fuel — Contaminated / Poor Quality » Refer to: Contaminants-in-Fuel Diagnosis ⇒ If a condition exists Repair or replace as necessary ⇓ If no condition exists
3. Inspect for aftermarket devices which may affect the operation of the system. ⇒ If a condition exists Repair or replace as necessary ⇓ If no condition exists

Note

Time to set this DTC may take several drive cycles

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC is not set
5. All OK. Circuit/System Testing
6. Ignition/Vehicle » Off
7. Verify the tool is available: CH-51450-A Oscilloscope Diagnostic Kit & CH-51450-LEAD-A Oscilloscope Basic Lead Kit ⇒ If the tool is not available 2.1. Perform the following procedure/test: Engine Compression Test Verify the procedure/test passes. ⇒ If the procedure/test does not pass Refer to: Symptoms - Engine Mechanical ⇓ If the procedure/test passes 2.2. Test or replace the component: Q17 Fuel Injector ⇓ If the tool is available
8. Perform the following procedure/test: Relative Engine Compression Test Verify the procedure/test passes. ⇒ If the procedure/test does not pass Refer to: Symptoms - Engine Mechanical ⇓ If the procedure/test passes
9. Test or replace the component: Q17 Fuel Injector Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification High Pressure Diesel Fuel Injector Replacement For control module replacement, programming, and setup refer to: Control Module References