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I have a 1996 gmc jimmy the shop is telling me three of the five monitors are not setting. I've drive. This truck over two hundred miles and this is the third time it has failed in three months. The DNR has referred me to another shop for someone else to drive the truck to set the monitors. I feel my rearend getting soar. Where can I find a step by step drive cycle for this to set the monitors.

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  • Cars & Trucks Master
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If you can tell us which monitors didn't set, maybe we can give you drive cycle for that monitor?
I have a drive cycle for GM it is long and drawn out procedure, plus, you need a scanner that shows live engine data to navigate the pids?
Enabling conditions, cold start. barometric pressure is more than 75kpa. The engine coolant temperature signal indicates between 39--86 degrees f. the iat temp signal is about the same.the difference between the iat and ect 14 degrees f or less. the battery voltage is between 10--18 volts. the fuel level is between 15--85 percent. After verifying the enable criteria, turn off the ignition for about 5 minutes, to allow 02 system to cool. Connect scan tool and navigate pids to verify. The evap monitor, if service bay test is unavailable, may require 6 drive cycles with up to 17 hours between drive cycles. The 02 heater monitor requires 10 hr cold soak to be enabled. Turn off all accessories, ac and accessory including aftermarket. open the hood. Set the parking brake and ensure vehicle is in park or neutral depending on the tranny. Turn ignition on, engine off for 1 minute. Start and idle the engine for at least 2 minutes, until the engine temp is at least 149 degrees f. Run the engine for 6.5 minutes within the following conditions. Keep the maf pid between 4--30 grams per second.Keep the engine speed between 1,000--3,000 rpm. Allow the engine to return to idle for 1 minute. Apply and hold the brake pedal and shift to drive or depress the clutch pedal, operate the vehicle within the following conditions for 2 minutes, steady as possible. Depress throttle until tip pid is over 2%. Keep the maf pid between 15--30 grams per second. Keep the engine speed between 1,200--2,000 rpm.Release the accelerator pedal and shift into park or neutral, depending, release clutch, allow engine to idle 2 minutes, if tp is not steady during this step, the tests may not run to completion. Quickly depress the accelerator pedal until tp pid is more than 8% and return to idle, repeat three times.

There are four or five more steps, shall I go on? I'm tired of typing at the moment. If you want the whole thing, let me know, and I will start where I left off.

Posted on Aug 06, 2017

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  • Cars & Trucks Master
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Google it ! Drive cycle for GM vehicles .

General Motors Driving Cycle Any codes stored would stop monitors from running .

Posted on Aug 06, 2017

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SOURCE: set timing 1997 jimmy

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SOURCE: 1999 GMC Jimmy Running Hot w/ Engine coolant reservoir empty

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The problem is most likely 90% head gaskets but could be intake manifold gasket leaking too. Intake gasket has to be checked when intake is removed. Might find problem there if not continue and remove heads. Bars Leak will not work.

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SOURCE: 2001 gmc jimmy. replaced secondary air intake pump

i have been changing the big green fuse in a box near the inside wall on passenger side. you have to take the battery out to see this box. i have had the fuse replaced 3 times and the light went off so i went to have it inspected and it did not pass because of the pump they say. i don't want to have to pay 300.00 just for this part. pam

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SOURCE: Security light comes on while driving on my 2001 GMC Jimmy

Several GM products, including the Chevrolet Impala and Malibu, the Oldsmobile Alero, the Pontiac Grand Prix, and Saturn Ion, have issues with the Security light coming on. This is many times an indication of a failing Body Control Module (BCM). Initially, the Security light will come on then go off, progressing to a constant on light, before the car will refuse to start. Other symptoms may include erratic action of electronics, a clicking sound coming from the glove box, and the air conditioning failing to blow cold air. I recommend a shop that specializes in the electronic systems of vehicles to diagnosis and make the necessary repairs. They should keep the car until they replicate the symptoms described. A new BCM from GM should cost about $230; plan on another $200 for them to diagnose the problem, replace the unit, and program the new unit. The dealers quote between $700 and $1,100 for the same repair. My experience and the experiences I have read on the internet, indicate the new BCM should last only about a year.

Posted on Aug 14, 2009

Molson02536
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SOURCE: 99 gmc suburban -Service lite on= o2 sensor

It sounds like the fuel filter may have reached it life time and needs to be replaced. The fuel filter should be replaced every 15,000 miles if not once every year to ensure that the fuel system is running 100%. A dirty fuel filter is the #1 cause of fuel pump failure due to extra heat created to push the gas to the fuel injectors, the other cause is running the gas tank less then 1/4. It's the gas that keep the fuel pump cool and not running hot.
Start with the simple and replace the fuel filter which should be located On all C/K's of this body-type 88-98, the fuel filter is located under the driver's side door inside the frame rail near the crossmember that supports the tail of the transmission. Replace it with AC Delco part GF-626, FRAM part G3727, or other comparable brand corresponding metal bodied filter. You should use a flare-nut wrench for the line fitting and one for the filter fitting. I'm not sure of the size needed for the filter, but the line should be 5/8"
For SFI engines ('96 and later) you need to bleed off the pressure in the line. Locate the pressure test port on the fuel rail under the hood, remove the cap, press valve to relieve line pressure and recap valve. If ground clearance is not high enough to get under vehicle and work, raise it with jack and rest frame on jack stands.
Caution: Fuel in lines and filter will run out once fittings are undone. Use fuel safe container to catch fuel spill.
Take wrenches and hold filter from rotating, while loosening line fittings. Remove Filter from bracket by sliding and manipulating fuel lines for clearance, and slide filter out of bracket.
Reassembly is reverse of disassembly. Tighten fittings snugly. Reconnect battery, turn ignition on (do not start). Pump will make brief whirring sound - less than 5 seconds. Check for leaks. No leaks - good. Now you can drive again.
Hope that helps, keep me posted. Glad to know you got your truck running 100% again soon.

Posted on Nov 05, 2009

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