Code 44, Lean Exhaust Indication: Notes
CODE 44 ECM TERMINAL & CKT WIRING IDENTIFICATION
| Application | ECM Terminal | Wire Color | |
|---|---|---|---|
| "F" Body | |||
| O2 Signal | E14 | Purple | |
| O2 Ground | E15 | Tan | |
| "Y" Body | |||
| O2 Signal (Left) | D6 | Purple | |
| O2 Signal (Right) | D22 | Purple | |
| O2 Ground | D17 | Tan | |
NOTE:
This chart is also used to diagnose Code 64, which is a lean right exhaust indication for Corvette.
O2 sensor acts like an open sensor circuit and produces no voltage when exhaust temperature is less than 600°F (316°C). An open sensor circuit or cold sensor causes "open loop" operation. Corvette is equipped with 2 oxygen sensors. Code 44 will reflect a lean left O2 sensor; Code 64 will indicate a lean right O2 sensor. Perform test procedures for right or left sensor as necessary.
NOTE:
Test number refers to number on diagnostic chart.
- Checks to see if O2 sensor is registering a lean condition. Code 44 is set when O2 sensor voltage signal at control module is low (less than .3 volt) for a precalibrated period and system is operating in "closed loop".