dbelnap

Trying to fix the P0140 code (caused by leaky battery). Have tested the air pump and the replaced the check valve (they seem to be OK); have replaced the vacuum line from the MAP to the connection right above the computer (just below the battery tray, inside the passenger fender) and now trying to test and replace the other lines.

There is another line that also goes into the big wiring harness wrap (taped and fish netted all together) and goes somewhere. ???

Rather than tear the wrap and harness all apart can any tell me where the other end is connected? Might be easier to just put a whole new line in rather than looking for the leak.

Tested the other lines to the canister and also the actuator they are good, just this one line remains. Help anyone. If anyone has a vacuum line diagram please post a link or a pix. Thanks. Doug Belnap

sunchaser73

DTC P0140 is "HO2S Circuit Insufficient Activity Bank 1 Sensor 2." Is this the correct code that you are getting? The service manual addresses diagnostic checks for the wiring, but NOT vacuum lines...

Still looking for the vacuum diagram...will post when I find it. In the meantime, if your issue revolves around the HO2S, I can send you the troubleshooting procedure and wiring diagram.

dbelnap

Sorry for the typo...Secondary Air Supply problem

I'm also thinking that the vacuum line that I'm trying to test is the line that goes back thru the firewall into the A/C unit, used to control the a/c vents.

Think this line might be accessed thru the passenger front floor board...but not sure???

Thanks Doug Belnap

ICUALL

Vacuum System

All valves in the HVAC module except the temperature valve are controlled by engine vacuum drawn from the vacuum tank, mounted on the RH hinge pillar. The vacuum is routed by a vacuum control solenoid valve (mounted to the RH side of the HVAC module, near the blower motor) to spring-loaded vacuum actuators on the HVAC module. Vacuum stored in the vacuum tank is prevented from bleeding back to its source during conditions of low engine manifold vacuum (acceleration, heavy load, etc.) by a check valve in the vacuum source line.
The vacuum control solenoid valve is controlled by the HVAC control head, which sends the commands necessary to obtain the mode which has been selected. For each mode selected, the HVAC control head energizes or de-energizes specific solenoids in the vacuum control solenoid valve in order to direct vacuum to specific hoses to overcome the force of the spring within the appropriate vacuum actuator(s). The vacuum control solenoid valve also vents the hoses to each remaining vacuum actuator to normal air pressure, allowing the actuator spring to expand. This results in the valves (doors) being properly positioned for the selected operating mode.
The mode, defroster and heater valves use three-position vacuum actuators. A three-position vacuum actuator has a diaphragm with a spring on both sides. At rest (no vacuum applied) the diaphragm will be in the mid-position, allowing for a blend mode. When vacuum is applied to either end of the diaphragm, the diaphragm will move the affected valve to either stop, which will direct airflow to only one of the two possible outlets.
When air is directed to the floor outlets, as in LOWER mode, a small amount of air still bleeds through the defroster outlets to help eliminate re-fogging of the windshield.


AS above the line comes thru the firewall and connects to the vacuum control solenoid valve (mounted to the RH side of the HVAC module, near the blower motor).Access is gained by removing the panel on the passenger side. The line from the engine compartment connects to the PURPLE line shown in the picture below

ICUALL