Federal (With RPO Code FE9, NG1)
DTC P0236 FEDERAL (WITH RPO CODE FE9, NG1)CIRCUIT DESCRIPTION
The boost sensor responds to pressure changes in the intake manifold. This pressure is created by the turbocharger and changes with accelerator pedal position (APP) and engine speed. The engine control module (ECM) uses this information to assist in diagnosis of the barometric pressure (BARO) sensor and to provide engine overboost protection. The boost sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The ECM supplies 5 volts to the boost sensor on a 5-volt reference circuit, and provides a ground on a low reference circuit. The boost sensor provides a voltage signal to the ECM on a signal circuit relative to the pressure changes. The ECM monitors the boost sensor signal for voltage outside of the normal range. The ECM calculates a predicted value for the boost sensor. The ECM then compares the predicted value to the actual signal. This DTC will set if the boost sensor signal is below the predicted range.
CONDITIONS FOR RUNNING THE DTC
- DTC P0237 is not set.
- The engine speed is between 500-2,700 RPM.
- The total fuel quantity burned is more than 2,000 mm(3).
- The engine coolant temperature (ECT) is more than 72°C (158°F).
CONDITIONS FOR SETTING THE DTC
The measured boost pressure is below the expected range by 50 kPa or more for 12 seconds.
ACTION TAKEN WHEN THE DTC SETS
- The control module stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
- The driver information center, if equipped, may display a message.
CONDITIONS FOR CLEARING THE DTC
- A current DTC Last Test Failed clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- Clear the DTC with a scan tool.
TEST
Steps 1-3:
Steps 4-6:
Steps 7-8:
Steps 9-14:
