– Introduction General Information In–33 6. EVAP Monitor (Vacuum monitor and LEV II) IMPORTANT To complete the ”Internal Pressure Readiness” monitor, you must perform a ”Cold Soak” procedure prior to conducting the driving pattern procedure. Cold Soak Preconditions The monitor will not run unless: MIL is OFF Fuel level is approximately 1/2 to 3/4 Altitude is 7,870 feet (2,400 m) or less Cold Soak Procedure Let vehicle cold soak for 8 hours or until the difference between IAT and ECT is less than 13 ° F (7 ° C) Examples:
Scenario 1 ECT = 75 ° F (24 ° C) IAT = 60 ° F (16 ° C) Difference between ECT and IAT is 15 ° F (8 ° C) → The monitor will not run because difference between ECT and IAT is greater than 13 ° F (7 ° C) Scenario 2 ECT = 70 ° F (21 ° C) IAT = 68 ° F (20 ° C) Difference between ECT and IAT is 2 ° F (1 ° C) → The monitor will run because difference between ECT and IAT is less than 13 ° F (7 ° C) 3,000 rpm Idling IG SW off Soak 15 to 50 min. (When the readiness code or diagnostic code is set, this test is completed.) 10 sec. Warm up A18910 Preconditions The monitor will not run unless:
MIL is OFF Fuel level is approximately 1/2 to 3/4 Altitude is 7,870 feet (2,400 m) or less* Engine Coolant Temperature (ECT) is between 40 ° F and 95 ° F (4.4 ° C and 35 ° C) Intake Air Temperature (IAT) is between 40 ° F and 95 ° F (4.4 ° C and 35 ° C)* Cold Soak Procedure has been completed 1996–2003 ADDITION OF OBD (OTH021U) 33 Author : Date: