Emission Monitors

[jmtn4x4]

Ok failed emisssions cause of two monitors NOT reaching "ready". AIR(secondary air injection) and evap. All others are "ready". I have driven well over 200 miles in hwy and city but no change. One code pops up the imfamous P0410 does not trigger the mil and also air pump turns on upon cold starts so no blown fuses. 2001 Jimmy 4x4 4.3 W motor. Hepl?

[superjim]

See if this may help..

 

http://www.obd-codes.com/p0410

 

http://acdelcotechconnect.com/pdf/tsb/tsb_04D-183.pdf

[jmtn4x4]

Thanks for info. It has the upgraded hoses, vac lines, valves, and a new pump all the bells and whistles. It does turn on (can hear whirring for about a minute and feel vib) that's what is confusing me as to why the monitor is not showing a ready state. One more thing I found was I can drive with fuel cap off and no codes are being set for evap system. Could one system cause another not to react but still throw no code?

[superjim]

Thanks for info. It has the upgraded hoses, vac lines, valves, and a new pump all the bells and whistles. It does turn on (can hear whirring for about a minute and feel vib) that's what is confusing me as to why the monitor is not showing a ready state. One more thing I found was I can drive with fuel cap off and no codes are being set for evap system. Could one system cause another not to react but still throw no code?

 

 

I suppose it COULD...it would be very unusual to not throw SOME KIND of code.

How are you reading the codes?

[minibike132]

Thanks for info. It has the upgraded hoses, vac lines, valves, and a new pump all the bells and whistles. It does turn on (can hear whirring for about a minute and feel vib) that's what is confusing me as to why the monitor is not showing a ready state. One more thing I found was I can drive with fuel cap off and no codes are being set for evap system.

The evap tests are not continuously run, it takes very strict coditions for the test to run, no code will set unless the test runs and fails.

Could one system cause another not to react but still throw no code?

A fault in one of the systems can inhibit testing of another system but in order for the test to be inhibited there would be a code set.

 

Conditions that must be met in your vehicle for the A.I.R system to run the tests are

 

 

• DTC's P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0151, P0152, P0153, P0154, P0155, P0157, P0158, P0160, P0161, P0171, P0172, P0174, P0175, P0300, P0440, P0442, P0446, P0506, or P0507 are not set.

 

 

• The engine run time is more than 15 seconds after closed loop operation.

 

 

• The engine load is less than 33 percent.

 

 

• The engine air flow is less than 20 g/s.

 

 

• The engine speed is more than 750 RPM.

 

 

• The ignition voltage is more than 11.7 volts.

 

 

• The air fuel ratio is 14.7:1.

 

 

• The engine coolant temperature (ECT) is between 2-110°C (35-230°F).

 

 

• The intake air temperature (IAT) is between -10 to +100°C (14-212°F).

 

 

• The fuel system is not operating in power enrichment or deceleration fuel cut-off.

 

 

• The startup ECT is below 80°C (176°F).

 

 

• The vehicle speed is more than 15 km/h (25 mph).

 

 

 

 

 

 

Conditions to run the evap tests are

 

 

• DTCs P0107, P0108, P0110, P0112, P0113, P0115, P0117, P0118, P0121, P0122, P0123, P0125, P0443, P0449, P0452, P0453, P1106, P1107, P1111, P1112, P1114, P1115, P1121, or P1122 are not set.

 

 

• The ignition voltage is between 10-18 volts.

 

 

• The barometric pressure is more than 75 kPa.

 

 

• The fuel level is between 15-85 percent of full capacity.

 

 

• The engine coolant temperature (ECT) is between 4-30°C (39-86°F).

 

 

• The intake air temperature (IAT) is between 4-30°C (39-86°F).

 

 

• The start up ECT and IAT are within 9°C (16°F) of each other.

 

 

 

 

 

 

 

 

Where do you live, most states allow 2 I/M flags to not run. I am not aware of a state that does not allow any so you should be ok as long as you get one of them to run and pass. I say that I am not aware of one but I have not looked up the law for every state.

 

 

Some vehicles can be forced into a test event but not all, I would have to have it hooked up to the scan tool to be able to tell you if it could be done or not. If you are under a time constraint you may want to take it in to see if there is an I/M service bay test on your vehicle. If not just keep driving and monitoring, as you can see start up temp is going to effect the test status. I live in Illinois, my flags for those two systems might not run all winter if I park outside.

 

 

 

 

 

 

 

 

[jmtn4x4]

Reading codes with innova code scanner. I'm in northern Illinois and emissions for my year truck is only one monitor can be in NOT be ready so I am only looking right now to fix one and worry about the other later. Not under time limit emissions are due in june. I'm thinking you have a point parking outside here and being cold all the time might be an issue with evap monitor. Thanks to both of you Texas Jim and sparkstech. I'm gonna drive the heck out of this thing and wait till warmer weather seems to be the next step.

 

thanks again