DOCUMENTED DIAGNOSTIC CONTEXT

Diagnostic code articles — Page 4.

Understand what the recorded fault means, which findings change the diagnosis, and what the cited documentation can confirm. Each article states the system or vehicle scope it covers.

Some sources leave details unresolved. Those articles include a visible source note; a code match alone does not establish applicability to your vehicle.

high-pressure fuel control has reached its authority limit

Continuous low supply pressure and repeated short drops are different triggers

High fuel supply pressure and an ambiguous published threshold

compare coolant and fuel temperatures at the captured start

high-pressure pump solenoid low-side open circuit

fuel-pump control low-side short-to-ground monitoring

fuel-pump solenoid low-side short to power

Why a large fuel-leak code can come from excessive valve demand

intake temperature 2 is an outlier after a long soak

LIN-reported intake temperature 2 is below range

LIN-reported intake temperature 2 exceeds 150°C

intake temperature 2 has excessive in-range variation

Ambient-temperature plausibility during warm operation

Diesel fuel-pressure relief valve control-circuit fault

Fuel relief-valve low input has operating and closed-valve branches

Fuel relief-valve high control input and cross-circuit faults

Insufficient fuel-pressure reduction in Mazda diesel relief control

Bank 2 charge-air temperature changes too abruptly

a low charge-air signal can be represented as an extremely high temperature

an open charge-air temperature circuit can appear colder than minus 40°C

bank-2 intake temperature plausibility and stuck checks

Bank 2 manifold-temperature low checks use two signal domains

Separate an intake-temperature high value from a high circuit signal

bank-2 intake-temperature signal disagrees with its filter

An intake-temperature plausibility fault can be biased or stuck

A below-range inlet-temperature value needs channel confirmation

The high inlet-temperature check is a physical-range monitor

A temperature jump is judged against a filtered reference

a stuck turbo actuator can reflect vacuum or a misconnected N75 plug

radiator temperature fails a cold-soak comparison

radiator-temperature input resistance falls below its limit

radiator-temperature input resistance exceeds its range

radiator-temperature changes faster than the sensor model permits

Cold-start comparison of radiator and engine temperatures

Hot engine and radiator temperature separation

Low measured airflow has several distinct plausibility tests

High airflow plausibility depends on the monitor route and model

Bypass-valve circuit continuity differs from a stuck valve

The bypass-driver low check runs with the output off

The bypass-driver high code is supported by current feedback

Bypass valve B fails a commanded-open transient check

Turbo B overspeed needs the correct speed-channel mapping

fuel rail pressure fails the cranking start check

intake pressure sensors disagree after the engine stops

fuel-regulator supply integrity is tested outside device control

fuel-regulator supply high-side short to ground

fuel-regulator supply high-side short to power

Why several air temperature readings are compared after a long soak

Bank 1 oxygen heater performance and the impedance test distinction

Interpreting a bank 2 oxygen heater impedance result

Volkswagen CJAA oxygen-sensor offset correlation

charge-air-cooler coolant sensor A has low resistance

cooler inlet-coolant temperature input has excessive resistance

cooler coolant-temperature signal violates its response model

intake temperature 3 disagrees with its reference sensors

intake temperature 3 signal resistance is too low

intake temperature 3 signal indicates an open path

intake temperature 3 noise exceeds its change budget

Humidity-sensor performance is checked through its temperature reading

humidity value received over LIN is below range

humidity value reported above its allowed range

humidity signal is too erratic within one-second windows

A restricted EVAP vapor line is evaluated in two stages

The MAF circuit threshold is not published in this Ford summary

MAF performance judged through intake-flow models

Continental MAF signal frequency is below range

Continental MAF output frequency is too high

Why a brief MAF dropout can matter more than its average reading

Maxima uses an ambient-pressure sensor for this diagnosis

MAP performance through several intake-flow comparisons

MAP signal voltage falls below its electrical range

MAP circuit-high can indicate a power short or an open

MAP intermittency is an event-count diagnosis

Digital MAF sensor B failure is distinct from lost communication

bank-2 airflow versus a calculated flow envelope

A low MAF result may be a SENT data-range fault

high SENT data from airflow sensor B

Sensor B airflow interruptions need time-resolved evidence

Maxima has electrical and temperature-comparison branches

intake temperature 1 is the cold-soak outlier