DOCUMENTED DIAGNOSTIC CONTEXT

Diagnostic code articles — Page 37.

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.

Coolant sensor 6 circuit low follows a logical-to-input mapping

Coolant sensor 6 circuit high has contradictory assignment wording

Sensor 6’s implausible temperature jump uses its own response model

Air bypass valve position circuit below its signal range

Air bypass position signal high, including open-circuit causes

Bank 1 lean control in direct-injection mode needs the correct fuel-trim context

Direct-injection bank 1 rich control needs mode-specific evidence

Direct-injection bank 2 lean control should not be mixed with another fuel mode

Excessive positive adaptation on bank 1 port injection

Bank 1 port-injection adaptation below its rich limit

Bank 2 port-injection correction above the lean limit

Low bank 2 port-injection adaptation and the rich diagnosis

Warm exhaust shutter does not track its commanded opening

Exhaust shutter position signal electrically low

Exhaust shutter position signal electrically high

An open-circuit report from exhaust valve B control

Ground-short status on the exhaust valve B PWM circuit

Power-short status from exhaust valve B control

Bank2 exhaust-valve performance must retain its feedback path

Fuel regulator D control effort outside its plausible range

An open fuel-quantity control circuit in the regulator D path

Low-side ground-short diagnosis in fuel regulator D control

Fuel regulator D output stays high during an on command

Intake profile-position sensor A has a driver-level circuit check

Intake Hall sensor A reports a profile shift that was never requested

Sensor A circuit low belongs to the powered intake-profile output

Intake sensor A circuit high is checked after the output is switched off

Intake profile-position channel B has its own open-circuit result

Hall sensor B can report a valid-looking sequence at the wrong time

The intake B-channel low fault requires an energized output

Intake channel B retains a power-short indication while commanded off

Intake profile channel C is electrically open under its on command

Intake Hall sensor C reports movement without a requested shift

Intake channel C circuit low is evaluated with drive applied

Intake profile sensor C has an off-state power-short check

Reductant pump current depends on heating or pumping mode

Exhaust camshaft sensor A must not be confused with intake sensor B

Exhaust Hall sensor A reports a shift with no matching request

Exhaust sensor A circuit low is a powered-driver classification

Exhaust profile sensor A circuit high is judged with the driver off

Exhaust profile-position sensor B is checked for an energized open path

Exhaust Hall sensor B can report movement that the controller never commanded

The exhaust B-channel low fault requires an on-state electrical check

Exhaust sensor B remains electrically high after switch-off

high-pressure pump control reaches its cold-start limits

rail pressure falls short during catalyst warm-up

rail pressure exceeds its catalyst warm-up target

two sump oil-temperature readings disagree

Ford hybrid exhaust heat-exchanger connector checks

Detecting a stuck bypass valve from pressure pulsations

F-150 2.7L temperature warnings need model-year-specific diagnosis

PowerBoost ground integrity before auxiliary battery isolator replacement

Coolant-pump performance is inferred from phase-current behavior

Do not borrow throttle-voltage limits for a clutch-actuation sensor

High clutch-actuation feedback needs its own circuit specification

A valid clutch-actuation signal can still fail rationality

third oxygen channel below its physical-range limit

third oxygen channel above its physical-range limit

underfloor SCR efficiency evaluated with filtered evidence

Wagoneer ventilation hose code with MUA and PCV valve branches

Ford and Lincoln charging interruption with SOBDM P2C94

Bank 1 wastegate tracking during cold-start emissions control

Second wastegate channel fails the CSERS tracking check

Regulator D high-pressure deviation with a negative signed error

Regulator D low-pressure control error and fuel-reserve context

fan 2 runs below a modeled speed expectation

Fan 2 speed above the controller’s estimated allowance

fan 3 underspeed is a model-based performance result

downstream filter pressure offset checked with no exhaust flow

a downstream pressure signal that does not react to transients

downstream pressure raw signal below its electrical range

high downstream pressure signal can mean an open circuit

excessive jumps between downstream pressure samples

Explorer and Aviator warm A/C with a BCMC terminal concern

The intake tuning valve’s learned closed stop exceeds its accepted range

One tuning-valve code covers current and temperature reports

reductant heating response compared with a temperature model

F-150 Lightning coolant-heater diagnosis and the ECT2 test step

Excitation-current diagnosis through rotor resistance evidence

Low excitation-current report with an incomplete published limit