Question about 1999 Chevrolet Malibu

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Monitors wont set

I have a 99 malibu with a 3.1l that wont set the H0S monitor nor the evap, cat, secondary air, egr. did the drive cycle provided by gm 4 different times and nothing. the car goes into closed loop and idles smoothly. it reaches a temp around 217 deg. but still wont set. looking for any suggestion. also did check function of o2 sensors and found no fault.

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SOURCE: 2001 pt cruiser codes po 605 and po 700

Diagnostic trouble code P0605 indicates internal Transmission Controller fault. Needs to be replaced

Posted on Jan 19, 2009

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SOURCE: xj6 monitor reset

I had the same problem. The dealer had to reprogram the ecu. It cost about $110.

Posted on Jun 11, 2009

jeffbvegas1
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SOURCE: 1993 7.4 liter in a motor home. Runs nicely until

You might start considering the PROM as these values and other parameters could be incorrect within the chip programming especially with Banks add ons.Another item,EGR could be agressive and delivering too much flow causing uncontrollable lean mixtures that put you into open loop.Check all other outboard sensors such as Temp-MAP which could take your system into open loop as well as o2's which you are aware of.It is possible for o2's to be giving false values...good luck

Posted on Jul 01, 2009

madirishman1
  • 83 Answers

SOURCE: after clearing all im monitor codes and driving

No this will not. Computer has a keep alive . Evap and a.i.r. run on different schedules then other monitors.Usually EVAP is gas tank related.Have some smoke system to see if there are any leaks. In NY you can pass with monitor not running for that year truck

Posted on Feb 08, 2010

Testimonial: "thank you for your reply it was helpful to know the pmc has to be kept alive."

  • 67 Answers

SOURCE: 2001BLAZER HAD A PO442 CODE. REPLACE C.C.V. AND

evap vent valve if you have a scanner with function test go to evap vent valve turn it on and off should hear a clicking noise

Posted on Mar 17, 2010

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2 Answers

Cat and egr monitors will not set


Cant you disconnect the battery and the computer resets..Watch out for the alarm.

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What is the drive cycle computer rest for 2010 corolla


drive cycle, why not just forget that. I do. (mostly)
why>?
what do I do, i reset the PCM with my $10 scan tool
when dont, all monitors are now reset, ALL !

drive cycles to finish off all monitors? (a goal for say smog testing)

that is easy most clear fast. running fast.
but not EVAP, can take up to 30min but
if fuel tank is fuel, it never completes EVAP until 1/4 lower, 3/4 full and less.
EGR tests? can be easy if you drive fast, and then coast to a stop
both tests cleared. (sans complete)
monitors are (no appliclable, not ready or complete)
to do smog, all must be complete and no DTCs. (rare exceptions)

the drive cycle means number of times it takes to set a code for one test monitor or clear one.
some newer cars take 2 drives to set them.
and is important, the FSM covers this.
why not post symptoms or reasons for asking.

just curious?, then read the ASE book on OBD2 technology.

alldata.com RTM.

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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

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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

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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.


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1 Answer

After clearing all im monitor codes and driving


No this will not. Computer has a keep alive . Evap and a.i.r. run on different schedules then other monitors.Usually EVAP is gas tank related.Have some smoke system to see if there are any leaks. In NY you can pass with monitor not running for that year truck

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1 Answer

99 5.4 Expedition issues


P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to DPF EGR sensor
  • DPF EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • DPF EGR sensor hoses both off
  • DPF EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM

P1299 - Cylinder Head Over Temperature Protection Active Indicates an engine overheat condition was detected by the cylinder head temperature (CHT) sensor. An FMEM Strategy called Fail-safe Cooling was activated to cool the engine.
  • Engine cooling system concerns
  • Low engine coolant level
  • Base engine concerns

P0300 - Random Misfire The random misfire DTC indicates multiple cylinders are misfiring or the PCM cannot identify which cylinder is misfiring.
  • Camshaft position sensor (CMP)
  • Low fuel: less than 1/8 tank
  • Stuck open EGR valve

P0443 - EVAP Control System Canister Purge Valve Circuit Malfunction The PCM monitors the EVAP canister purge valve circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified purge duty cycle by PCM command.
  • VPWR circuit open
  • EVAP canister purge valve circuit shorted to GND
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  • EVAP canister purge valve circuit open
  • EVAP canister purge valve circuit shorted to VPWR
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P1451 - EVAP Control System Canister Vent Solenoid Circuit Malfunction Monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.
  • VPWR circuit open
  • CV solenoid circuit shorted to PWR GND or CHASSIS GND
  • Damaged CV solenoid
  • CV solenoid circuit open
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  • Damaged PCM

P1309 - Misfire Monitor Disabled When the misfire monitor is disabled, usually due to the input signal generated by the camshaft position (CMP) sensor, by sensing the passage of teeth from the CMP wheel.
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  • Powertrain control module
  • ECT, MAF, and CKP sensors

with the codes you have here I would look in the direction of the egr valve first because that will cause the bucking and stalling, and the misfires, but so will the canister vent solonoid. the misfire codes and the cylinder overtemp code could be from overheating or because if the misfires.

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1 Answer

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