EGR Cooler And Diagnostics
The High Pressure Cooled EGR Monitor is a series of electrical tests and functional tests that monitors various aspects of EGR system operation
The Exhaust Gas Temperature sensor (EGRT) measures the gas temperature downstream of the EGR cooler and is used to determine EGR cooler effectiveness.
EGR TEMPERATURE SENOR "B" ELECTRICAL CHECK OPERATION
| DTCs | P041C EGR Temperature Sensor "B" Circuit Low P041D EGR Temperature Sensor "B" Circuit High P041B EGR Temperature Sensor "B" Range/Performance |
| Monitor Execution | Continuous, during EGR monitor |
| Monitor Sequence | None |
| Sensors OK | No EGR flow faults (P0401, P0402) |
| Monitoring Duration | 5 seconds to register a malfunction |
TYPICAL EGR TEMPERATURE SENOR "B" CHECK ENTRY CONDITIONS
| Continuous |
TYPICAL EGR TEMPERATURE SENOR "B" CHECK MALFUNCTION THRESHOLDS
| EGR Temp Sensor "B" voltage: > 4.94 volts, < 0.32 volts |
Dual Range EGR Temperature Sensor Transfer Function
| Range Switched at 100°C +/-5°C | |||
| Volts | Cold Range Temp (°C) | Volts | Hot Range Temp (°C) |
| 0.198 | 130 | 0.378 | 250 |
| 0.331 | 110 | 0.438 | 240 |
| 0.567 | 90 | 0.511 | 230 |
| 0.747 | 80 | 0.596 | 220 |
| 0.984 | 701 | 0.697 | 210 |
| 1.677 | 50 | 0.818 | 200 |
| 2.137 | 40 | 0.960 | 190 |
| 2.913 | 25 | 1.127 | 180 |
| 3.668 | 10 | 1.323 | 170 |
| 4.087 | 0 | 1.548 | 160 |
| 4.416 | -10 | 2.091 | 140 |
| 4.648 | -20 | 2.732 | 120 |
| 4.799 | -30 | 3.069 | 110 |
| 4.891 | -40 | 3.708 | 90 |
The High Pressure Cooled EGR Monitor is a series of electrical tests and functional tests that monitors various aspects of EGR system operation. The Exhaust Gas Pressure sensor (EXP) measures the exhaust pressure downstream of the EGR cooler and is used primarily for EGR cooler effectiveness.
EXHAUST PRESSURE SENSOR "A" ELECTRICAL CHECK OPERATION
| DTCs | P0472 Exhaust Pressure Sensor "A" Circuit Low P0473 Exhaust Pressure Sensor "A" Circuit High P0474 Exhaust Pressure Sensor "A" Circuit Intermittent/Erratic P0471 Exhaust Pressure Sensor "A" Circuit Range/Performance |
| Monitor Execution | Continuous, during EGR monitor |
| Monitor Sequence | None |
| Sensors OK | |
| Monitoring Duration | 5 seconds to register a malfunction |
TYPICAL EXHAUST PRESSURE SENOR "A" CHECK ENTRY CONDITIONS
| Continuous |
TYPICAL EXHAUST PRESSURE SENOR "A" CHECK MALFUNCTION THRESHOLDS
| Exhaust Pressure Sensor "A" voltage: > 4.80 volts, < 0.21 volts |
EXHAUST PRESSURE SENSOR TRANSFER FUNCTION
| Pressure Range: 49 [kPa] to +378 [kPa] Vout = Vref * (0.0027 * Pexh) + -0.0715) Pexh in [kPa], Vref is 5.0 volts |
|
| Volts | Pressure, kPa |
| 0.300 | 49 |
| 0.982 | 100 |
| 1.518 | 140 |
| 2.053 | 180 |
| 2.522 | 215 |
| 3.058 | 255 |
| 3.527 | 290 |
| 4.70 | 378 |
EGR COOLER CHECK OPERATION
| DTCs | P2457 - EGR Cooler Efficiency Below Threshold |
| Monitor Execution | once per driving cycle |
| Monitor Sequence | |
| Sensors OK | P0071, P0072, P0073, P0106, P0107, P0108, P2227, P2228. P2229, P044C, P044D, P0405, P0406 |
| Monitoring Duration | 70 seconds to register a malfunction |
TYPICAL EGR COOLER CHECK ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Ambient Air Temperature | > 35 deg F | < 200 deg F |
| BARO | > 22.0 in Hg | |
| Engine Running |
TYPICAL EGR COOLER CHECK MALFUNCTION THRESHOLDS
| P2457: Insufficient flow rate ratio > 0.5 after sufficient EGR flow accumulation |