Engine Controls - Unstable High Altitude Idle: Overview
No: TSB-11-13-005DATE: June, 2011
MODEL: 2008-11 Lancer Evolution
SUBJECT:
ECM REPROGRAMMING FOR UNSTABLE IDLE IN HIGH ALTITUDE AREAS
PURPOSE
Some customers in high altitude areas (higher than 4,900 feet/1500m) may report the following after decelerating with the throttle fully closed:
^ briefly higher than normal engine RPM, and/or
^ idle hunting when the clutch pedal is depressed.
This TSB provides a procedure for reprogramming the ECM with new software to correct the condition.
IMPORTANT:
If an affected vehicle has a Malfunction Indicator Lamp (MIL) illuminated and DTCs are listed in the ECM memory (before reprogramming), diagnose and repair those DTCs per the service manual before reprogramming. DO NOT reprogram the ECM until the reason(s) for other DTCs being set is corrected.
AFFECTED VEHICLES
2008-2011 Lancer Evolution with 5 M/T
REQUIRED OPERATIONS
The following equipment is needed to reprogram the ECM.
^ MEDIC laptop computer with A/C power adaptor - 520924, or M1T547708.
^ VCI (Vehicle Communication Interface) - MB991824.
^ MUT-III main harness "A" (blue DLC connector) - MB991910.
^ USB 2.0 cable - MB991827.
^ "Engine Compartment/Control Module" label - p/n MSSF024G00.
^ Reprogramming Database N11051
^ MEDIC-3 update at 061 or higher.
^ Standalone MUT-III laptop with Version 25 installed.
ECM REPROGRAMMING CHART
PARTS INFORMATION
WARRANTY INFORMATION