Your Vehicle: 2001 Ford Escort ZX2 L4-2.0L DOHC VIN 3
 
Vehicle » Powertrain Management » Computers and Control Systems » Testing and Inspection » Pinpoint Tests » DQ: Barometric Pressure (BARO) Sensor - Pinpoint Test  
 
 
  DQ: Barometric Pressure (BARO) Sensor - Pinpoint Test  
 

DQ: Barometric Pressure (BARO) Sensor

DQ: Introduction See: DQ: Barometric Pressure (BARO) Sensor - Introduction

DQ1 DTC P0106, P0107, P0108 AND P0109: CHECK BARO PID

  • Obtain local barometric pressure reading.
  • Access BARO PID.
  • Compare PID readings with chart.

Does PID reading compare with that of chart?
Yes

.

No

  • GO to DQ2

.

DQ2 CHECK BARO SIGNAL AND SIG RTN CIRCUIT FOR OPEN

  • Measure resistance of the BARO circuit between PCM harness connector pin and BARO sensor harness connector.
  • Measure resistance of the SIG RTN circuit between PCM harness connector pin and SIG RTN at the BARO sensor harness connector.

Is each resistance less than 5.0 ohms?
Yes

  • GO to DQ3

.

  • For DTC P0108:

GO to DQ7
.

No

  • REPAIR open circuit.

DQ3 CHECK VREF VOLTAGE TO BARO SENSOR

  • Disconnect BARO connector.
  • Measure voltage between VREF and SIG RTN circuits at the BARO harness connector.

Is VREF voltage between 4.0 and 6.0 volts?
Yes

  • KEY OFF. GO to DQ5

.

No

  • KEY OFF. GO to DQ4

.

DQ4 CHECK VREF CIRCUIT FOR OPEN

  • Measure resistance of the VREF circuit between PCM harness connector pin and VREF at the BARO sensor harness connector.

Is resistance less than 5.0 ohms?
Yes

  • GO to DQ5

.

No

  • REPAIR open circuit.

DQ5 CHECK BARO CIRCUIT FOR SHORT TO GROUND

  • Measure resistance between the BARO and SIG RTN circuits at the PCM harness connector.
  • Measure resistance between the BARO circuit at the PCM harness connector and the battery negative post.

Is each resistance greater than 10,000 ohms?
Yes

  • GO to DQ6

.

No

  • REPAIR short circuit.

DQ6 CHECK FOR VREF CIRCUIT SHORT TO GROUND

  • Measure resistance between the VREF circuit and SIG RTN circuits at the PCM harness connector.
  • Measure resistance between the VREF circuit at the PCM harness connector and the battery negative post.

Is each resistance greater than 10,000 ohms?
Yes

No

  • REPAIR short circuit.

DQ7 DTC P0108: INDUCE OPPOSITE CODE

  • Disconnect BARO sensor.
  • Key on.
  • Check DTCs.

Is DTC P0107 present?
Yes

  • KEY OFF. REPLACE BARO sensor.

No

  • KEY OFF. GO to DQ8

.

DQ8 CHECK BARO SIGNAL FOR SHORT TO POWER

  • Measure resistance between BARO and VPWR circuits at the PCM harness connector.

Is each resistance greater than 10,000 ohms?
Yes

No

  • REPAIR short circuit.