DOCUMENTED DIAGNOSTIC CONTEXT

Diagnostic code articles — Page 13.

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.

Cylinder3 resistance monitoring begins after the basic fault checks

A cylinder4 glow performance fault is not just an open-circuit result

Cylinder5 glow resistance requires more evidence than continuity

Cylinder6 performance monitoring follows the open and short checks

The cylinder7 resistance check is explicitly limited to the V8 example

Cylinder8 glow performance needs the operating resistance test

cylinder 1 glow-plug resistance rationality

why cylinder 2 can fail the glow-plug rationality test

cylinder 3 glow-plug performance judged by resistance

cylinder 4 glow-plug incorrect versus an electrical short

cylinder 5 glow-plug rationality with a source-label caveat

cylinder 6 glow-plug rationality and inconsistent source wording

An incorrect-glow-plug code can be a live resistance-rationality result

Cylinder 8 glow-plug rationality depends on both voltage and current feedback

Ignition-control performance can be an internal SPI communication error

the fifth sensor reference is monitored for low supply voltage

Reference E low identifies the VSS2 speed-sensor supply

Reference E high uses the VSS2 rail’s own voltage scale

Reference E uses an internal bandgap check, not the external five-volt limits

oil-pressure control open circuit is an electrical monitor

oil-pump control voltage is low in the off state

oil-pump control circuit stays high when driven on

two-stage oil-pump response remains in the high-pressure state

a two-stage oil pump fails to leave its low-pressure state

Ford glow-plug module memory checksum fault

Pacifica wake-up performance and permanent-code clearing

glow-control performance can be judged by calculated ground offset

the auxiliary-pump controller sees its 15-volt sensor supply low

sensor supply C is above the ATPC limit

Compass starter performance and market-specific PCM logic

Ford upstream NOx sensor processor performance fault

Ford downstream NOx sensor processor performance fault

Wrangler restart performance and coordinated PCM/ABS software

Volkswagen CJAA cold-start intake-airflow control performance

The transmission request points to a separate diagnostic record

Allison range inhibition and low pump-pressure diagnosis

the Jeep diesel engine module is reporting a transmission fault

brake-message validity in a documented disabled calibration

Clutch switch comparison needs repeated driving events

An invalid range pattern is different from a bad PWM frequency

A plausible selector position can still carry the wrong signal frequency

transmission range low voltage is encoded in PWM behavior

transmission range high voltage requires the right PWM convention

Transmission-temperature circuit evidence must be separated from a substituted value

transmission temperature plausibility includes warmup behavior

transmission temperature circuit low means very low inferred resistance

high transmission-temperature circuit input can indicate an open path

Why turbine-speed circuit evidence comes before a road-speed comparison

input-speed performance tracks repeated implausible drops

input speed stays low when operating conditions imply activity

Intermittent turbine-speed circuitry is not the same as noisy speed data

Brake-switch status fails to match repeated deceleration

Transmission mode switch remains active too long

Manual-override input consistency is separate from a high or low signal

Manual-override input low is not the same as a consistency fault

Manual-override input high needs the correct input mapping

An output-speed circuit fault can be detected while the vehicle is stationary

directional output-speed plausibility needs more than RPM

output speed remains low despite qualifying torque conditions

output-speed intermittency is counted as repeated drop events

Brake signal stays active during repeated acceleration

A hardware-reported engine-speed circuit fault differs from implausible speed

Engine-speed performance includes jump, noise and coupling checks

A missing engine-speed signal must be implausible for the transmission state

Sixth-gear ratio evidence depends on which transmission reports the code

Stuck in reverse is judged from failed disengagement attempts

first gear fails repeated disengagement attempts

Second gear can be declared stuck after repeated neutral requests

Third-gear disengagement uses a different fork-feedback branch

Fourth-gear stuck diagnosis follows the shift toward neutral

a CVT ratio fails despite reaching control limits

First-gear ratio checks require a stable commanded gear

Second-gear ratio errors need timing and repeat-count context

Third-gear ratio disagreement is a comparison, not a component verdict

Fourth-gear ratio verification must include the end of the shift

Fifth-gear ratio evidence must be separated from engagement evidence

Reverse needs its own diagnostic scope rather than a forward-gear threshold

fifth gear remains engaged through failed release attempts

Sixth gear stuck means repeated failure to disengage it

Seventh-gear stuck detection follows position sensor 2