Mopar data logging

Published 4 November 2026

A log is the only proof of what the engine did with the file. Build the channel list around the complaint, not around every PID the scanner offers.

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2005–2014 5.7, 6.1 and 6.4 only. A 2015+ truck or an 8HP is not covered yet. How files are handled.

Channels to record

Channel list for a 2005–2014 Hemi. Names shift between operating systems; search for the key word if one does not match.
Channel	Why it is in the log
Engine rpm, vehicle speed, gear	Places every event. A shift complaint needs the gear, not just rpm.
Pedal and commanded / actual throttle	What you asked for versus what the blade did. These are separate channels.
MAP and barometric pressure	Load and the pressure ratio. KOEO MAP should match local barometric pressure.
Short and long trims, both banks	Closed-loop correction. A split bank points at that bank first.
Commanded fuel and wideband lambda	Command is not a measurement. Keep the raw fuel-to-air number beside lambda and AFR.
Spark and knock retard	Requested timing, final timing and what the knock system pulled.
Coolant, intake air, battery voltage	Thermal state and a low-voltage check before a write.
Desired and actual cam angle	Only on VVT engines. A stock cam on a stock file should track.
Cylinder mode	Separates four- and eight-cylinder data. The ECO lamp is not a channel.
Injector pulse width, fuel pressure if sensed	Duty and delivery. A calculated pressure is not a measured pressure.
Input speed, output speed, TCC state / slip	Gear ratio, converter slip and the shift event are three different things.
Transmission temperature, line pressure if logged	Heat changes behavior. If pressure is not available, record the gap.

Do not guess with a narrowband

A narrowband cannot measure full-throttle mixture. If the log has no wideband, the report says full-throttle mixture was not measured. We do not move power enrichment on a narrowband.

What makes a log usable

A fully warm idle, in Park or Neutral and in Drive with the brake on. Label the A/C segments.
A steady cruise that holds the condition you care about: MDS on, MDS off, converter locked, a specific gear.
The complaint, reproduced legally and safely. We do not ask for a street full-throttle pull.
One change at a time, then the same drive again. A log with three changes in it cannot tell you which one worked.

Three findings we see

The pedal is down, the throttle is closing, and there is no knock. That is torque management, not a spark problem. The fix is in driver demand and the torque limits, not a global spark add.
Knock retard on a four-cylinder handover. Tag the transition. Do not use it as a reason to add spark. That check belongs with MDS and VVT.
One bank's trims split. Check that bank's intake, exhaust, injector and oxygen sensor before you bend the airflow model for both banks.

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