3.
Check the waveform with turning on and off a/c switch after engine start.
Specification :
Pressure(psi) | 101.4 | 391.6 | 17.25.3 | 3035.5 | 3208.1 |
Voltage(V) | 0.5 | 0.87 | 2.57 | 4.24 | 4.46 |
IG "OFF" and connect the scantool.
Connect the probe to A/C pressure sensor signal and select the oscilloscope in the menu.
Check the waveform with turning on and off a/c switch after engine start.
Pressure(psi) | 101.4 | 391.6 | 17.25.3 | 3035.5 | 3208.1 |
Voltage(V) | 0.5 | 0.87 | 2.57 | 4.24 | 4.46 |
Is the measured waveform of A/C pressure sensor normal?
 | ▶ Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure. note There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by ECM. Before or after testing ECM on the vehicle, use this function to reuse the ECM on the others |
 | ▶ Substitute with a known - good A/C pressure sensor and check for proper operation. If the problem is corrected, replace A/C pressure sensor and go to "Verification of Vehicle Repair" procedure. |
