Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Feedback Control
Zero Fuel Calibration
Zero Fuel Calibration (ZFC) is an algorithm used to compensate for deviations in individual injector performance from nominal on the 6.7L diesel. In an overrun/decel fuel shut-off condition, fuel rail pressure is set to 300 bar and small injections are made from a single injector. The observed acceleration in crankshaft speed is detected and a regression line generated to predict the fueling required to achieve the expected acceleration. If the calculated fueling required to generate the expected acceleration in crankshaft speed falls outside the allowable control limits for the system, an addition routine is called to very precisely learn the adjustment to injector energizing time required to achieve expected acceleration. This information is then used to adjust all pilot injections on that injector to ensure correct fuel delivery. If the absolute energizing time observed for the test injection to yield the expected acceleration exceeds minimum or maximum limits, a code is set.
The 3.2L diesel uses a similar algorithm which operates at four injection pressures: 250 bar, 400 bar, 700 bar, and 1200 bar. It has two operating modes: a "fast" mode that operates quickly at only 400 bar to detect a "step change" in injector performance, and a slower mode that is designed to optimize injection throughout vehicle life. Separate faults with the same DTC exist for each mode.
| DTCs | P02CC - Cylinder 1 Fuel Injector Offset Learning at Min Limit P02CD - Cylinder 1 Fuel Injector Offset Learning at Max Limit P02CE - Cylinder 2 Fuel Injector Offset Learning at Min Limit P02CF - Cylinder 2 Fuel Injector Offset Learning at Max Limit P02D0 - Cylinder 3 Fuel Injector Offset Learning at Min Limit P02D1 - Cylinder 3 Fuel Injector Offset Learning at Max Limit P02D2 - Cylinder 4 Fuel Injector Offset Learning at Min Limit P02D3 - Cylinder 4 Fuel Injector Offset Learning at Max Limit P02D4 - Cylinder 5 Fuel Injector Offset Learning at Min Limit P02D5 - Cylinder 5 Fuel Injector Offset Learning at Max Limit P02D6 - Cylinder 6 Fuel Injector Offset Learning at Min Limit P02D7 - Cylinder 6 Fuel Injector Offset Learning at Max Limit P02D8 - Cylinder 7 Fuel Injector Offset Learning at Min Limit P02D9 - Cylinder 7 Fuel Injector Offset Learning at Max Limit P02DA - Cylinder 8 Fuel Injector Offset Learning at Min Limit P02DB - Cylinder 8 Fuel Injector Offset Learning at Max Limit P262A - Fuel Injector - Pilot Injection Not Learned P2B11 - Cylinder 1 Injection Pulse Offset Exceeded Learning Limit P2B13 - Cylinder 2 Injection Pulse Offset Exceeded Learning Limit P2B15 - Cylinder 3 Injection Pulse Offset Exceeded Learning Limit P2B17 - Cylinder 4 Injection Pulse Offset Exceeded Learning Limit P2B19 - Cylinder 5 Injection Pulse Offset Exceeded Learning Limit P2B1B - Cylinder 6 Injection Pulse Offset Exceeded Learning Limit P2B1D - Cylinder 7 Injection Pulse Offset Exceeded Learning Limit P2B1F - Cylinder 8 Injection Pulse Offset Exceeded Learning Limit |
| Monitor Execution | Continuous |
| Monitor Sequence | None |
| Sensors OK | AAT, ECT, injectors, PCV |
| Typical Monitoring Duration | all DTCs except P262A 30 sec P262A: 30 events of 0.8+ seconds each |
| Entry Condition (both) | Minimum | Maximum |
| P02CC, P02CD, P02CE, P02CF, P02D0, P02D1, P02D2, P02D3, P02D4, P02D5, P02D6, P02D7, P02D8, P02D9, P02DA, P02DB: | ||
| Intake Air Temperature | 0 deg C | |
| Fuel Temperature | 10 deg C | 75 deg C |
| Engine Coolant Temperature | 50 deg C | |
| System Voltage | 10 V | |
| Time in overrun/decel fuel shut-off | 30 sec | |
| Engine Speed | 890 rpm | 2400 rpm |
| Boost Pressure | 750 mbar | |
| Accelerator Pedal | 2% | |
| Transmission Gear (no gear change) | 4 th | 6 th |
| Difference between requested and actual FRP | 50 bar | |
| Torque Converter Locked | ||
| Fuel Balance Control wheel learn complete | ||
| Time after start (3.2L) | 0 sec | |
| Vehicle speed (3.2L) | 2 kph | |
| Rate of change of torque (3.2L) | 30 Nm/sec | |
| Rate of change of RPM gradient (3.2L) | -36 RPM/sec^2 | 36 RPM/sec^2 |
| Indicated torque (3.2L) | 3 Nm | |
|
NOTE:
these are the entry conditions for the base function. The monitor runs whenever the base function runs.
|
| P02CC, P02CE, P02D0, P02D2, P02D4, P02D6, P02D8, P02DA: If the observed energizing time for the test injection is 156 us or more lower than the target energizing time for the given injector, the code is set. P02CD, P02CF, P02D1, P02D3, P02D5, P02D7, P02D9, P02DB: If the observed energizing time for the test injection is 254 us or more higher than the target energizing time for the given injector, the code is set. P262A: If after 30 instances, each of 0.8 seconds or longer duration, where all entry conditions have been met and a pilot adaption value is not learned, this code is set. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.