BARO, TCB-A And TCB-A, Map Sensor 2-Way Correlation Check
Should a BARO, TCB-A, or MAP sensor pass the key-on test but become faulted during operation, two air pressure sensor correlation check are made.
- At low engine air flows no turbocharger boost is commanded and BARO should be very close to TCB-A.
- In certain operation regions, MAP can be estimated from TCB-A, throttle angle, and engine speed (a.k.a. speed-throttle).
These two correlations are then used to infer if any of the three air pressure sensors are faulted
BARO, TCB-A SENSOR 2-WAY CORRELATION CHECK ENTRY
| DTCs | P2227 Barometric Pressure Sensor "A" Circuit Range/Performance P0236 Turbocharger/Supercharger Boost Sensor "A" Circuit Range/Performance P0106 Barometric Pressure Circuit Range/Performance |
| Monitor execution | Continuous |
| Monitor Sequence | None |
| Sensors OK | BP, TIP, MAP |
| Monitoring Duration | 10 seconds |
BARO, TCB-A SENSOR 2-WAY CORRELATION CHECK ENTRY CONDITIONS
| Entry Condition | Minimum | Maximum |
| Low TP | 4.0° | |
| Low Engine rpm | 1500 rpm |
TYPICAL BARO, TCB-A SENSOR 2-WAY CORRELATION CHECK ENTRY MALFUNCTION THRESHOLDS
| pass (|BARO - TCB-A| < 5.5"Hg) AND (|MAP - Estimated MAP| < 3.5"Hg) P2227 (|BARO - TCB-A| > 5.5"Hg) AND (|MAP - Estimated MAP| < 1.8"Hg) P0106 (|BARO - TCB-A| < 1.8"Hg) AND (|MAP - Estimated MAP| > 3.5"Hg) P0236 (if none of above conditions met) |