E049

Code E049:

Emission Wiring Circuit:

DESCRIPTION:

This diagnostic test monitors the AIR system to detect operating problems with the Electric Divert Valve (EDV) and Electric Switching Valve (ESV). It performs these tests using the oxygen sensor and ECM integrator function to monitor valve function. This switch valve has a 2 pin connector and is located behind the cruise control servo bracket. The divert valve also has a 2 pin connector and is atop the AIR switch assembly.

TEST CONDITIONS:

1. Codes E013, E014, E015, E021, E022, E024, E031, E032, E034, E044, E045 not set.
2. Coolant temp between 80°C and 110°C.
3. Closed loop operation for 9 minutes, oxygen sensor ready.
4. Engine speed 400 RPM or greater.
5. Vehicle speed 0 MPH.

FAILURE CONDITIONS:

1. The ECM fails to detect an increase of 15 or more integrator counts, when AIR system diverts to the exhaust manifold.
2. System has failed test 4 times.

ACTION TAKEN:

1. ECM illuminates "SERVICE ENGINE SOON" telltale for entire key cycle.
2. AIR system is placed in divert.

NOTE ON INTERMITTENTS:

If code E049 is stored as a history code, verify oxygen sensor operation using Chart A-7. Check the operation of the AIR system using Chart C-7. Check all connectors, hoses and pipes for proper connection, corrosion, or damage.