Lineartronic CVT Live Data PIDs — Chain Condition, Pulley Health, and Ratio Accuracy

Subaru CVT live data requires a Subaru-capable enhanced scanner. The Lineartronic's proprietary PID set is not accessible via generic OBD2 — you need either the Subaru SSM4 factory scan tool, the Autel platform with Subaru enhanced software, or the Snap-on scanner with the Subaru CVT package. Here's what to pull and how to interpret it. CVT Ratio (Primary Pulley RPM / Secondary Pulley RPM): This is the baseline PID for all Lineartronic diagnostics. At idle in Drive with foot on brake, ratio should be at maximum (approximately 2.45:1 for the TR690). At 60 mph steady cruise, ratio should be approximately 0.42–0.52:1 depending on throttle position. The ratio should transition smoothly — any stepwise or hunting behavior during a steady-speed cruise indicates either a pulley position sensor issue or chain wear that is causing ratio inaccuracy. Log this PID over a 10-minute highway drive and review the trace. A healthy Lineartronic shows a smooth, continuous ratio curve. A worn unit shows a jagged trace with small oscillations around the target ratio.

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