Test V - Air Management System
- Codes 44, 45 and 46. Check air and vacuum lines to TAB/TAD solenoids and by-pass diverter valve for blockage, leaks, restrictions and proper routing. Repair as required and repeat QUICK TEST . If lines okay, go to step 4 for code 44; next step for code 45 and step 3 for code 46.
- Disconnect and plug vacuum line at diverter valve. Turn ignition off and wait 10 seconds. Perform KEY ON-ENGINE RUNNING (KOER) SELF-TEST and record codes. If code 45 present, EEC system okay, repair diverter valve or check valve. If no code 45, go to next step.
- Disconnect and plug vacuum line at by-pass valve. Turn ignition off and wait 10 seconds. Perform KEY ON-ENGINE RUNNING (KOER) SELF-TEST and record codes. If code 46 present, EEC system okay, repair by-pass valve. If no code 46, go to next step.
- Turn ignition off and wait 10 seconds. Enter Output State Check and perform KEY ON-ENGINE OFF (KOEO) SELF-TEST until end of Continuous code display. DVOM will indicate zero volts. Depress and release throttle and observe DVOM. If DVOM indicates high reading, remain in Output State Check and go to next step. If DVOM does not indicate high reading, depress throttle to wide open position and release. If DVOM still does not indicate high reading, go to TEST D , step 13). Leave equipment connected.
- Disconnect vacuum line at TAB solenoid supply port and install vacuum pump. Disconnect vacuum line at TAB solenoid output port and install vacuum gauge. While maintaining vacuum on TAB solenoid, depress and release throttle to cycle output on and off and observe vacuum gauge. Repeat procedure for TAD solenoid. If both vacuum outputs cycled on and off, go to next step. If either vacuum output does not cycle on and off, replace TAB/TAD solenoid assembly and repeat QUICK TEST .
- Disconnect TAB solenoid-to-thermactor valve vacuum hose. Connect vacuum pump and gauge and test hose for blockage and leaks. Repeat procedure for TAD solenoid-to-thermactor valve vacuum hose. Repair as required and repeat QUICK TEST . If vacuum lines okay, go to next step.
- Disconnect vacuum lines at TAB/TAD solenoids and start engine. If vacuum is present, EEC system okay, service air pump or thermactor valve. If vacuum is not present, repair source of vacuum leak or blockage and repeat QUICK TEST .