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This technical bulletin is part of Diesel Help’s member-only diagnostic library.
When fault codes stop making sense, the issue is often understanding how the system you’re working on is designed to operate.
Start here:
Know the diesel fuel system you are diagnosing
Tagged 24CF00 and 24CE00- Air mass measurement: Measured air mass is too high compared with the calculated air mass, 26CF00 - Fuel pre-supply-pressure control Fuel pre-supply pressure too low/positive control deviation, 27F000 - Charge-air hose monitoring at idle: Charge-air hose fallen off, 290B00 - Air system, 2E0600 - Engine start, air to EGR air mass flow, fuel pressure slow to build, hard to start, long cranking, plausibility: Fuel pre-supply pressure too low at engine start, plausibility: Measured air mass compared with calculated air mass too low
