3788070

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.

1.

Check open in harness

(1)

IG "OFF" and disconnect knock sensor connector and PCM connector.

(2)

Measure resistance between terminal 1 of knock sensor harness connector and terminal 54 of PCM harness connector.

(3)

Measure resistance between terminal 2 of knock sensor harness connector and terminal 53 of PCM harness connector.

Specification : Below 1Ω

(4)

Is the measured resistance within specification?

YES

▶ If the problem is corrected after substituting with a known - good knock sensor, replace it. If the problem is pending, check for proper operating after substituting with a known - good PCM. and then if the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.

NO

▶ Repair open in harness, and go to "Verification of Vehicle Repair" procedure.

caution

There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. After testing PCM on the vehicle, use this function to reuse the PCM on the others