P1195

Barometric pressure (EGR boost) sensor circuit malfunction

Detection Conditions

• The ECU monitors input voltage from the EGR boost sensor when monitoring conditions are met.  If input voltage at ECU terminal 3F is below 0.35 V or above 4.5 V, the ECU determines that there is an EGR boost sensor circuit malfunction.

  Monitoring Conditions:

  • Intake air temperature is above 10 degrees C
  • EGR boost sensor solenoid is turned OFF (with barometric pressure applied to the EGR boost sensor).

• The ECU monitors differences between intake manifold vacuum and atmospheric pressure at idle, which the EGR boost sensor detects by switching the EGR boost sensor solenoid.  If the difference is below 6.43 kPa (48.2 mmHg, 1.90 inHg), the ECU determines that there is an EGR boost sensor performance problem.

Diagnostic Support Notes

• This is a continuous monitor (CCM)
• Check engine indicator illuminates if the ECU detects the above malfunction condition during the first drive cycle
• PENDING CODE is not available
• FREEZE FRAME DATA is available
• DTC is stored in ECU memory

Possible Causes

• EGR boost sensor malfunction
• Connector or terminal malfunction
• Short to ground in wiring between EGR boost sensor terminal A and ECU terminal 3F
• Open circuit in wiring between EGR boost sensor terminal B and ECU terminal 3AB
• Open circuit in wiring between EGR boost sensor terminal A and ECU terminal 3F
• EGR boost sensor signal circuit shorts to reference voltage (Vref) supply circuit
• EGR boost sensor performance problem
• EGR boost sensor solenoid circuit malfunction
• Loosened, damaged, misconnected, clogged or frozen moisture in vacuum hose from EGR boost sensor solenoid to EGR boost sensor
• Loosened, damaged, misconnected, clogged or frozen moisture in vacuum hose from EGR boost sensor solenoid to EGR valve
• ECU malfunction