DTC Advanced Diagnostics: P023D (3.0L Engine)
DTC P023D: Turbocharger Boost Sensor/Manifold Absolute Pressure (MAP) Sensor Incorrect Correlation
General Description
The turbocharger system controls the wastegate valve to adjust the flow of boost pressure. The turbocharger boost sensor is compared with the manifold absolute pressure (MAP) sensor during high load of the engine to detect stuck low of the turbocharger boost sensor. If the value of the turbocharger boost sensor is different from the value of the MAP sensor, the powertrain control module (PCM) detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 3.5 seconds or more |
| DTC Type | Two drive cycles, MIL on |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| MAP value change per 5 milliseconds | 5 kPa (38 mmHg, 1.5 inHg) | - |
| Other | MAP sensor value is higher than BARO sensor value | |
Malfunction Threshold
MAP sensor value - (minus) turbocharger boost sensor value is less than the value shown in the table, or more than 15 kPa (113 mmHg, 4.5 inHg) for at least 3.5 seconds.
| MAP sensor value [MAP Sensor (Hi Res)] | Malfunction threshold value |
|---|---|
| 60 kPa (450 mmHg, 17.7 inHg) | Less than -75 kPa (-563 mmHg, -22.2 inHg) |
| 80 kPa (600 mmHg, 23.6 inHg) | Less than -60 kPa (-450 mmHg, -17.8 inHg) |
| 90 kPa (675 mmHg, 26.6 inHg) | Less than -50 kPa (-375 mmHg, -14.8 inHg) |
| 100 kPa (750 mmHg, 29.5 inHg) | Less than -50 kPa (-375 mmHg, -14.8 inHg) |
| 300 kPa (2, 250 mmHg, 88.6 inHg) | Less than -150 kPa (-1, 125 mmHg, -44.3 inHg) |
Possible Cause
- Turbocharger boost sensor failure
- MAP sensor failure
- Barometric pressure (BARO) sensor failure
Confirmation Procedure
Operating Condition
- Start the engine.
- Take 15 seconds to accelerate from 0 mph (0 km/h) to 63 mph (100 km/h).
- Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC, the freeze data, and the on-board snapshot are stored.
Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.