P0108
DTC P0108 MANIFOLD ABSOLUTE PRESSURE/BAROMETRIC PRESSURE CIRCUIT HIGH INPUTComponent Location:
COMPONENT LOCATION
GENERAL DESCRIPTION
The Manifold Absolute Pressure(MAP) sensor measures the change of pressure in the intake manifold. The pressure of intake manifold is changed as variable engine running condition and converted into voltage and that is monitored by the PCM.
DTC DESCRIPTION
If MAP sensor output voltage is higher than 4.8 volts, the PCM determines that a fault exists and a DTC is stored.
DTC Detecting Condition:
Schematic Diagram:
Signal Waveform & Data:
MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector(DLC).
2. Monitor the "INTAKE MAP" parameter on scantool.
Specification
Ignition "ON" & Engine "OFF": Approx.1010 mbar (101 kPa, 14.65 psi) 1010 mbar (104 kPa, 15.08 psi).
Ignition "ON" & Engine "ON": Approx.310 mbar (31 kPa, 4.49 psi) 370 mbar (37 kPa, 5.37 psi).
3. Is Current data displayed correctly?
YES: Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to "Component Inspection" procedure.
TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination,deterioration, or damage.
3. Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair". procedure.
NO: Go to Signal Circuit Inspection procedure.
SIGNAL CIRCUIT INSPECTION
1. Check voltage
1. Ignition "OFF"
2. Disconnect MAP sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal "1" of the MAP sensor harness connector and chassis ground.
Specification: Approx. 0 V
5. Is the measured voltage within specifications?
YES: Go to "Ground Circuit Inspection" procedure.
NO: Go to "Check for short to battery in harness" as below.
2. Check for short to battery in harness
1. Ignition "OFF"
2. Disconnect MAP sensor connector.
3. Measure resistance between terminal "1" and 2 of the MAP sensor harness connector.
Specification: Infinite
4. Is the measured resistance within specifications?
YES: Go to "Ground Circuit Inspection" procedure.
NO:
- Check for short to battery in harness between the PCM and the MAP sensor.
- Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
GROUND CIRCUIT INSPECTION
1. Check for open in harness
1. Ignition "OFF"
2. Disconnect MAP sensor connector.
3. Measure resistance between terminal "4" of the MAP sensor harness connector and chassis ground.
Specification: Approx. below 1 Ohms
4. Is the measured resistance within specifications?
YES: Go to Component Inspection procedure.
NO:
- Check for open in harness between the PCM and the MAP sensor.
- Repair or replace as necessary. And then, go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. Check performance test
1. Ignition "OFF"
2. Connect MAP connector.
3. Remove the MAP sensor and turn the ignition key to the ON position.
4. Using 5 hand-held vacuum pump, apply vacuum and measure the "MAP SENSOR" parameter on scantool.
Specification:
5. Is the parameter displayed within specification?
YES: Go to "Check PCM" as below.
NO:
- Substitute with a known - good MAP and check for proper operation.
- If the problem is corrected, replace MAP and go to "Verification of Vehicle Repair" procedure.
2. Check PCM
1. Ignition "OFF" & Engine "OFF"
2. Connect Scantool and Ignition "ON"
3. Select simulation function on scantool.
4. Simulate voltage at terminal 1 of MAP sensor signal connector.
5. Does the signal value of MAP sensor changes according to simulation voltage?
YES: Thoroughly check connectors for looseness, poor connection, bending,corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Substitute with a known - good PCM and check for proper operation.
If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Monitor that all readiness tests have been verified as "Complete"
5. Are any DTCs present?
YES: Go to the applicable troubleshooting procedure.
NO: System is performing to specification at this time.