Component Inspection

Component Inspection

1. Check MAPS Performance
(1) IG "OFF" and install scantool.
(2) Connect probe to MAPS and TPS to check signal waveform by using oscilloscope function.
(3) ENG "ON" and monitor signal waveform during acceleration and deceleration.
A. Specification:









(4) Is the measured signal waveform (MAP/TPS Rationality) O.K ?
YES
1) Go to "Check PCM" as follows.
NO
1) Substitute with a known-good MAPS and check for proper operation. If the problem is corrected, replace MAPS and go to "Verification of Vehicle Repair" procedure.
2. Check PCM
(1) IG "OFF" disconnect MAPS connector
(2) Connect Scantool and IG "ON" & ENG "OFF"
(3) Select simulation function on scantool.
(4) Simulate voltage at terminal 1 of MAPS harness connector.




(5) Does the signal value of MAP sensor change according to simulation voltage ?
YES
1) 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
1) 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.

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