P1492

SYSTEM DESCRIPTION
This system controls the vacuum signal applied to the EVAP canister purge control valve. When the ECM detects any of the following conditions, current does not flow through the EVAP canister purge control solenoid valve.
The solenoid valve cuts the vacuum signal so that the EVAP canister purge control valve remains closed.
- Start switch "ON"
- Closed throttle position
- Low or high engine coolant temperature
- During deceleration
- Engine stopped

COMPONENT DESCRIPTION




EVAP Canister Purge Control Solenoid Valve
The EVAP canister purge control solenoid valve responds to signals from the ECM. When the ECM sends an OFF signal, the vacuum signal (from the intake manifold to the EVAP canister purge control valve) is cut.
When the ECM sends an ON (ground) signal, the vacuum signal passes through the EVAP canister purge control solenoid valve. The signal then reaches the EVAP canister purge control valve.




EVAP Canister Purge Control Valve
When the vacuum signal is cut by EVAP canister purge control solenoid valve, EVAP canister purge control valve shuts off the EVAP purge line.




EVAPORATIVE EMISSION SYSTEM DIAGRAM




CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (128) (ECCS ground).




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE




With Consult
1) Turn ignition switch "ON".
2) Select "DATA MONITOR" mode with CONSULT.
3) Wait at least 5 seconds.

OR

With Generic Scan Tool
1) Turn ignition switch "ON" and wait at least 5 seconds.
2) Select "MODE 7" with GST.

OR

Without Consult
1) Turn ignition switch "ON" and wait at least 5 seconds.
2) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.




DIAGNOSTIC PROCEDURE




WIRING DIAGRAM

COMPONENT INSPECTION
EVAP Canister Purge Control Solenoid Valve







Check air passage continuity.
If NG, replace solenoid valve.