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Fuel Delivery

Tank to injector tip — lift pump, filter, high-pressure pump, rail, regulator and injectors. On direct-injection and diesel systems the pressures involved are extreme, which makes both the diagnostic care and the failure consequences greater than on older port-injected engines.

902 codes · 22 composants · 15 paramètres en temps réel

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Composants

Paramètres en temps réel à surveiller

PID Paramètre Unité Conversion
01:03 Fuel system status Whether fuelling is running open-loop or closed-loop, per bank. Open loop means the module is ignoring the oxygen sensors and using a fixed map — expected when cold, a fault when warm. — Bit-encoded
01:06 Short term fuel trim — Bank 1 The module's immediate fuelling correction, moving constantly as the oxygen sensor switches. Positive means it is adding fuel to correct a lean condition. Read alongside long term trim — short term swinging while long term sits high tells a different story from both being high. % (A / 1.28) − 100
01:07 Long term fuel trim — Bank 1 The learned, persistent correction the module has settled on. This is the parameter behind P0171 and P0172, and the one worth comparing at idle versus higher load: a vacuum leak drives it strongly positive at idle and less so under load, while a fuel delivery problem does the reverse. % (A / 1.28) − 100
01:08 Short term fuel trim — Bank 2 Bank 2's immediate correction. Comparing the two banks is the fastest way to separate a bank-specific fault from a shared one. % (A / 1.28) − 100
01:09 Long term fuel trim — Bank 2 Bank 2's learned correction. Both banks drifting together points at the airflow sensor, fuel pressure or the evaporative system; one bank alone points at that bank's injectors, gasket or sensor. % (A / 1.28) − 100
01:0A Fuel pressure Gauge fuel pressure, where a sensor is fitted. Coarse resolution compared with the dedicated rail pressure PIDs, and absent on many vehicles. kPa A × 3
01:22 Fuel rail pressure relative to manifold Rail pressure measured relative to manifold vacuum, which is what actually determines injector flow. More diagnostically meaningful than absolute pressure on port-injected engines. kPa 0.079 × ((256 × A) + B)
01:23 Fuel rail gauge pressure Rail pressure for direct injection and diesel systems, where pressures run far higher. Compare commanded against actual across the load range — that comparison is the core of diagnosing P0087 and P0088. kPa 10 × ((256 × A) + B)
01:2F Fuel tank level input Fuel level as a percentage. More than a gauge reading — several monitors are inhibited when the tank is very low or very full, which is why some faults will not reproduce until the level is right. % A × 100 / 255
01:44 Commanded air-fuel equivalence ratio Target mixture expressed as lambda, where 1.0 is stoichiometric. Reading the target alongside what the wideband sensor actually reports is how you tell a fuelling problem from a sensor problem. λ ((256 × A) + B) × 2 / 65536
01:51 Fuel type Declared fuel type. Worth confirming on flexible-fuel and dual-fuel vehicles, since it changes which monitors run and what mixture targets apply. — Enumerated
01:52 Ethanol fuel percentage Measured ethanol content. A value that never changes after refuelling with a different blend indicates the composition sensor has stopped responding. % A × 100 / 255
01:59 Fuel rail absolute pressure Absolute rail pressure on high-pressure systems. The parameter to watch when diagnosing the P0087 to P0094 group, and the one to compare against an independent gauge when a drifting sensor is suspected. kPa 10 × ((256 × A) + B)
01:5D Fuel injection timing When injection occurs relative to top dead centre. On a diesel this governs combustion noise, emissions and peak cylinder pressure, so a deviation is heard as much as measured. ° (((256 × A) + B) / 128) − 210
01:5E Engine fuel rate Instantaneous fuel consumption. Comparing this against expected consumption at a known load is a quick way to confirm that a suspected rich condition is real rather than inferred from trim values. L/h ((256 × A) + B) / 20

Codes défaut

Critique 2
Élevée 300
Modérée 182
Faible 11

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