W/Harness Inspection

Terminal and 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

1. IG "OFF" and Disconnect MAFS connector.
2. IG "ON" & ENG "OFF"
3. Measure voltage between terminal 2 of MAFS harness connector and chassis ground

Specification : B+





4. Is the measured voltage within specification ?






Signal Circuit Inspection

1. Check voltage
(1) IG "OFF" and disconnect MAFS connector.
(2) IG "ON' & ENG "OFF".
(3) Measure voltage between terminal 1 of MAFS harness connector and chassis ground.

Specification : Approx. 5V





(4) Is the measured voltage within specification ?





2. Check short to battery in harness
(1) IG "OFF" and disconnect MAFS and PCM connector.
(2) Measure resistance between terminal 1 and 2 of MAFS harness connector.
(3) Measure resistance between terminal 1 and 4 of MAFS harness connector.

Specification : Infinite





(4) Is the measured resistance within specification ?





3. Check short to ground in harness
(1) IG "OFF" and disconnect MAFS and PCM connector.
(2) Measure resistance between terminal 1 of MAFS harness connector and chassis ground.

Specification : Infinite





(3) Is the measured resistance within specification ?





4. Check open in harness
(1) IG "OFF" and disconnect MAFS and PCM connector.
(2) Measure resistance between terminal 1 of MAFS harness connector and terminal 47 of PCM harness connector.

Specification : Approx. below 1 ohms.





(3) Is the measured resistance within specification ?






Ground Circuit inspection

1. IG "OFF" and disconnect MAFS connector.
2. Measure voltage between terminal 1 of MAFS harness connector and chassis ground.
3. Measure voltage between terminal 1 and 3 of MAFS harness connector.

Specification : Voltage difference between Measurement "A" and "B" is below 200 mV.





4. Is the measured voltage within specification ?