W/Harness Inspection

Engine

Engine Control - P0109 Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent - W/Harness Inspection

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?






Power Circuit Inspection

Check voltage
1. IG "OFF"
2. Disconnect MAPS connector.
3. IG "ON"
4. Measure the voltage between power terminal of MAPS harness connector and ground.

Specification : Approx. 5 V

5. Is the measured voltage within specification?






Signal Circuit Inspection

Check short to ground in harness
1. IG "OFF"
2. Disconnect MAPS and PCM connector.
3. Measure the resistance between signal terminal of MAPS harness connector and ground.

Specification : Infinite

4. Is the measured resistance within the specification?





Check open in the harness
1. IG "OFF"
2. Disconnect MAPS and PCM connector.
3. Measure the resistance between signal terminal of MAPS harness connector and MAPS signal terminal of PCM harness connector.

Specification : Approx. below 1 Ohms

4. Is the measured resistance within the specification?






Ground Circuit Inspection

Check open in harness
1. IG "OFF".
2. Disconnect MAPS connector.
3. IG "ON" & ENG "OFF"
4. Measure the voltage between power terminal of MAPS harness connector and chassis ground. (Measurement "A")
5. Measure the voltage between power and ground terminals of MAPS harness connector. (Measurement "B")

Specification :"A" - "B" = : Approx. below 200mV

6. Is the measured voltage within specification?