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

• Unable to duplicate or identify fault at this time. GO to Z1 See: Diagnostic Trouble Code Tests and Associated Procedures\SECTION 5: Pinpoint Tests\Z: Intermittent - Pinpoint Test

.

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

• REPLACE BARO. If concern is still present, REPLACE PCM. (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) See: Programming and Relearning\Flash Electrically Eraseable Programmable Read Only Memory - Flash EEPROM).

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

• REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) See: Programming and Relearning\Flash Electrically Eraseable Programmable Read Only Memory - Flash EEPROM).

No

• REPAIR short circuit.