Ignition Switch "OFF"
Connect VMI to GDS and select oscilloscope.(2 Channel)
Channel A (+) : Pin No. 2(Air control valve position signal) connector (On Air Control Valve Connector)
Channel A (-) : Ground
Ignition switch "ON" & engine "OFF"
Inspection condition : Engine Idle and Engine "OFF"
Specification : Refer to Fig. 1
Fig.1 ) At Engine Idle (A) and Ignition Switch "OFF", Throttle Actuator Position Signal Waveform.
※ After Ignition Switch "OFF", Throttle Actuator operates 4 times.
Is the measured value within specification?
 | ▶ Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector or was repaired and ECM memory was not cleared. 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. |
 | ▶ If no problems were found with the circuits or connectors, Replace the ACV unit and go to "Verification of Vehicle Repair" procedure. |
When install a part, tighten it within specification.
When drop down the part, check part's operating condition whether it is damaged or not.
Do not use cleaner, spray and grease may affect a performance of lambda sensor.
Sensor wiring can be damaged by exhaust system such an exhaust manifold.
After replacing the ACV, perform "Component Change Routine". Otherwise, problem that performance or emission concerned can be occured from replacing the part.
Ignition Switch "OFF"
Connect GDS to Data Link Connector(DLC).
Ignition Switch "ON" & Engine "OFF"
Perform "Component Change Routine"of "Vehicle S/W Management" with GDS.
Select "Throttle Valve".
Fig.1 ) S/W Management List of U2 Engine
Fig.2 ) Component Change Routine
Fig.3 ) Throttle Valve Replacement
Fig.4 ) Complete
