Question about 1999 GMC Safari

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99 safari egr and o2 sensors won,t show ready. i did 200km and every drive cycle procedure i could find. 4 moniters not ready....egr,cat.,evap,and o2 . i only need egr,cat, or o2 to pass.

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  • GMC Master
  • 1,250 Answers

Look for this pdf informations you will find what you are looking for

http://www.epa.ohio.gov/Portals/27/echeck/docs/OBDReadiness_DriveCyclesNov2012.pdf

Posted on Oct 16, 2013

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: 1997 gmc jimmy

Sounds like the cpi injector assembly. The fuel pressure regulator may be leaking. Or the poppet valves on the injectors may be sticking or shot. I replaced almost every part on my truck and that is what it ended up being the whole time. It's a common problem on these models. Hope this helped

Posted on Mar 04, 2009

daves944
  • 1050 Answers

SOURCE: 02 sensors not ready

The code P0420 indicates that the catalytic converter is not functioning efficiently. This could be because the cat is damaged or the engine is not running very well and the cat cannot keep up with the emissions. You should ensure that the spark plugs and ignition components are in top shape before replacing anything else. If a compression check reveals a low cylinder, you will not be able to prevent this code as even a new cat cannot keep up with a dead miss. If the state of tune and the compression is good, then you'll likely need a cat.

I've posted the drive cycle just so you know what to do when you have resolved the code.

  1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F (50°C) and within 11°F (6°C) of the ambient air temperature at startup.
    Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
  2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire, and - if closed loop is achieved- Fuel Trim.
  3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
  4. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
  5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
  6. Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
  7. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
  8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Posted on May 14, 2009

  • 3600 Answers

SOURCE: Random misfire code CAT efficiency code evap pressure sensor

it can be two things the cat pluging up or the evap canister valve is stuck open or the fuse is blown check fuses first if ya need more help post here and I will give ya some more info.
avid101

Posted on Aug 20, 2009

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1 Answer

My 1996 Pontiac grand am.3 montiors are inc the egr,evap,cat.all new parts entire exhaust system.new evap parts,egr value.What can it be? my 1996 Pontiac grand am 3.1. 3 montiors...


Not sure I am following your question.
You have to drive the car for at least 100 miles in various conditions before the sensors will be functional. Its called a drive cycle.
Are there any trouble codes stored ?

Aug 30, 2013 | Pontiac Grand Am Cars & Trucks

1 Answer

02 sensor not ready,catalyst not ready


The catalyst is able to oxidize hydrocarbons (unburnt fuel) at about 600 degrees. The air injection pump routes fresh air straight to thecat to aid in speeding up the light off time. once there, the cat stays warm enough to oxidize at all times. The oxygen sensors have heater circuits built in (4 wire vs. the earlier 2 wire O2 sensors, this is why they're referred to as HO2S; Heated O2 Sensors) As for the term "Not Ready" this applies to one of the monitors run by the PCM the Emissions Monitor. EGR flow, O2 sensor operation, catalyst temp are all monitored by the PCM so it can decide whether it will run in Open Loop (ignoring O2 sensor inputs) or Closed Loop (adjusting fuel trim by reading the O2 Sensor input) To change a monitor status from "Not Ready" to "Ready" is as simple as driving as per TRIP guidelines. Once a TRIP is completed (a TRIP is an acronym don't remember what it is right now, but a TRIP is different than a drive cycle) then monitors will have completed and be "ready" unless there is a problem in which a DTC will be stored along with freeze frame data (Mode 6) and if enough key cycles for the individual code (Some are instantaneous, some are 3 key cycles, some are 5, and some are successive key cycles), then a MIL or Check Engine Light will turn on as well.
Hope this helps

Mar 08, 2013 | Cars & Trucks

1 Answer

Need description of obd drive cycle


This is my drive cycle a generic drive cycle i have used many times over the years and it has never failed me most drive cycles are too specific and impossible to adhere to for most drivers follow these steps exactly 1. make sure all codes are cleared and no check engine light is on 2 make sure the fuel level is between 1/4 and 3/4 full (this is part of the enable criteria for the evap monitor to run ) 3 let vehicle set overnight 4 start engine and let idle until the temp gauge is in the middle (this cold start enables the evap monitor and runs the O2 sensor heater test )5 drive vehicle around town avoid the highway stay at below 50 mph and when stoping at lights remove your foot from the gas and coast from around 50 to about 10mph or less if possible this will run the EGR monitor after about 3 to five miles of this proceed to the highway or freeway and travel over 50 but under 70 mph for about 3 to 5 miles this will run the catalyst test provided the O2 monitors passed if they didnt you will have a check engine light on before this point also i do a coast down on exit ramps (no braking) they make great places to get that EGR to run ONCE YOU START THIS PROCEDURE DO NOT KILL THE ENGINE OR SOME OF THE TEST WILL FAIL TO RUN

Jan 04, 2013 | 1999 Lexus ES 300

1 Answer

98 chevy astro changed egr and catalytic con and airfilter,gas cap,and0n the obd2 scan tool it shows no trouble codes it shows catalitic inc and evap inc.


I think your scan tool is showing that the monitors
for the Evap System have not run yet,thus incomplete

The evap will only run every few days & only if driven
for some time.

The O2 Sensor Data should be on the scan tool

I would replace the front ones if they have 100,000
miles on them

I would look at short term fuel trim also,most likely
it will be 3 or 4 % Pos or Neg & Switching

An Oscilloscope is the only way to look at an O2 Sensor
as far as I have found. A volt meter is a waste of time & won't
give you switching counts in real time

The Converter won't be complete until it warms up to
at least 850 deg or more

Aug 30, 2012 | Chevrolet Astro Cars & Trucks

1 Answer

1997 Dodge Caravan ECM will not go Ready, no trouble codes


In order to set the monitor it the drive cycle 2 trip criteria that means you need to have a cold start up and reach operating temperature then another cold start up with a operating temperature reached and the drive for each one is part throttle hold for 2 miles and a decelration for the catalytic to get ready.when the cat is ready the evap runs.If you are loosing monitor at key off and everything reset you can see the referee let them smog it. The EGR and EVAP are almost impossilbe to get ready

Feb 24, 2012 | Dodge Caravan Cars & Trucks

1 Answer

What is the drive cycle for a 1999 vw jetta


The drive cycle is as follows
For all OBD2 VW's

OBD-II Drive Cycle Stages
The OBD-II Drive Cycle is an eight-stage course, as illustrated in the
chart on page 3. An explanation of each step is provided below.
Stage 1: Cold Start-The ECM determines the presence of a cold start
by comparing the engine coolant temperature to the ambient air
temperature during startup. The engine is considered cold when:
• Engine coolant temperature is below 122°F (50°C).
• Engine coolant and intake air temperatures are within 11°F (6°C) of
each other at startup.
During this period, the O2S heater, misfire, AIR, fuel system, and EVAP
monitors run.

Stage 2: Idle 2½ Minutes-Turn the air conditioning (A/C) and
headlights on to help the misfire monitor-the additional electrical loads
help even out combustion pulses. During this period, the O2S heater,
AIR, EVAP, misfire, and possibly fuel system (if operating in closed loop)
monitors run.

Stage 3: Accelerate-Prior to accelerating, turn off the A/C and
headlights (if possible). Open the throttle halfway until you reach
55 MPH (89 KPH). During acceleration, the misfire, fuel system, and
EVAP monitors run.

Stage 4: Steady State Cruise-During this portion of the cycle, the
O2S, AIR, EGR, EVAP, misfire, and fuel system monitors run.

Stage 5: Decelerate-Gradually coast down without applying the
brakes. Also, on manual transmission vehicles, remain in high gear and
do not press the clutch. During this period, the EGR, EVAP, and fuel
system monitors run.

Stage 6: Accelerate-Apply ¾ throttle until reaching 60 MPH (97 KPH).
During acceleration, the misfire, fuel system, and EVAP monitors run.

Stage 7: Steady State Cruise-During this period, the CAT, O2S, AIR,
EGR, EVAP, misfire, and fuel system monitors run.

Stage 8: Decelerate-Gradually coast down without applying the
brakes. Also, on manual transmission vehicles, remain in high gear and
do not press the clutch. During this portion of the Drive Cycle, the EGR,
EVAP, and fuel system monitors run.

You can try this a couple times, but if it doesn't work you should go to a VW specialty shop like the dealer or a shop that does mostly European cars and they can use the scan tool to force the car through readiness.


Oct 11, 2010 | 1999 Volkswagen New Jetta

1 Answer

NEED DRIVE CYCLE FOR 2004 CRV TO RESET CAT AND O2 MONOTOR


Here is the info

NOTE: The ignition key must not be on prior to the cold start otherwise the heated oxygen sensor diagnostic may not run.

1. As soon as the engine starts, idle the engine in drive for two and a half minutes with the A/C and rear defrost on. OBDII checks oxygen sensor heater circuits, air pump and EVAP purge.

2. Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle. OBDII checks for ignition misfire, fuel trim and canister purge.

3. Hold at a steady state speed of 55 mph for three minutes.

OBDII monitors EGR, air pump, O2 sensors and canister purge.

4. Decelerate (coast down) to 20 mph without braking or depressing the clutch. OBDII checks EGR and purge functions.

5. Accelerate back to 55 to 60 mph at half throttle. OBDII checks misfire, fuel trim and purge again.

6. Hold at a steady speed of 55 to 60 mph for five minutes.

OBDII monitors catalytic converter efficiency, misfire, EGR, fuel trim, oxygen sensors and purge functions.

7. Decelerate (coast down) to a stop without braking. OBDII makes a final check of EGR and canister purge.

Oct 02, 2010 | 2004 Honda CR-V

1 Answer

My 2000 Saturn did not pass inspection due to evap. and O2 sensors "Not Ready". How can I fix the problem or how can the problem be fixed?


What is the EVAP code?

The O2 are not ready because it takes some time for them to complete there self check after clearing trouble codes. This will involve a few drive cycles. Once the evap problem has been resoled, the check engine light cleared, you'll have to drive it for a couple of days to get everything in the "ready" status.

Sep 27, 2010 | 2000 Saturn SL

3 Answers

Can't get my 96 chev s-10 to pass inspection due to Not ready codes. I recently change the battery and have driven the veh about 200 miles. Autozone checked and said it was all good but the state...


Here is the drive cycle procedure for that vehicle, and let me know if you require any further assistance.


Running an OBD-II Drive Cycle

The purpose of the OBD-II drive cycle is to run all of the onboard diagnostics. The drive cycle should be perfomed when any trouble codes are erased from the PCM or if the battery was dis-connected. Performing the drive cycle will reset the monitors so that any further trouble codes can be detected.

The OBD-II system drive cycle begins with a cold start with the coolant temperature below 120 degrees F. and the coolant and the air temperature sensors within 10 degrees of each other. (The ignition key must not be "on" or in the "Run" position until the cold start or the heated O2 sensor diagnostic might not start)

1. As soon as the vehicle starts up, idle the engine in drive for two and a half minutes with the AC and the rear defrost on if equipped with a rear window defroster. The OBD-II will check the O2 sensor circuits, the air pump, and the EVAP purge.

2. After the two and a half minutes turn off the AC and the rear window defrost, and then accelerate to 55 mph at half throttle. OBD-II checks for any ignition mis-fires, fuel trim, and canister purge.

3. Hold steady at 55 mph for three minutes. OBD-II monitors the EGR system, the air pump, the O2 sensors and the canister purge.

4. After the three minutes decelerate down to 20 mph without using the brakes or the clutch. OBD-II checks the EGR and the purge functions.

5. Accelerate back up to 55 mph at half throttle. OBD-II checks for mis-fires, fuel trim, and purge functions again.

6. Hold steady at 55 mph for five minutes. OBD-II will monitor catalytic converter efficiency, for any mis-fires, EGR function, fuel trim, O2 sensor operation, and purge functions.

7. Decelerate to a stiop without using the brakes or the clutch. OBD-II makes a final check of the EGR system and the canister purge functions.

Sep 12, 2010 | 1996 Chevrolet S-10 Pickup

1 Answer

I have a 1996 saturn wagon. it failed on omissions for egr. ox sensor and catalyst. I had a new egr.. o2 sensor.. oxygen sesor before catalyst.. drove car on many different drive cycles and over 4-600...


You need to read the codes that your check engine light is showing. Go to Autozone or any place like that and they can read the codes for free. Throwing parts at a car doesn't fix it but finding the source of the problem and then repairing as necessary will allow for better results. Going off the check engine light being on can mean it is anything.

You have two O2 sensors on your car. One just after the head on the header. This is the O2 sensor that tells the PCM what the air/fuel is and the PCM can adjust accordingly. The one BEHIND the catalytic converter (or cat for short) does nothing but tell the PCM that the cat. is working properly. You may be changing the wrong O2 sensor. Also the EGR could be an electrical problem if that is the cause of the emissions failure.

So to review, find out the codes, post back with the codes and everything can go from there.

Feb 26, 2010 | 1996 Saturn SL

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