Question about Chevrolet Silverado 1500

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I have a 2004 Chevy Silverado and i just failed my emmsions test and the obd connector integrity fail and the malfunction indicator light (MIL) Status No Voltage: Fail...could it just be a fuse?

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Could be a fuse or a broken wire

Posted on May 28, 2011

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Strange, my 2004 Silverado failed AZ emissions test today for the same reasons.

Posted on Jun 14, 2011

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My OBD will not come on to do smog for 2000 grand prix super charge V6


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What does mil cmd fail mean?


MIL is your malfunction indicator lamp, (check engine light)

CMD is the computer interface port, or OBDII port indicating a malfunction communicating with your cars computer

check all the fuses, primarily any marked pcm and retest your vehicle
note: your check engine or MIL has to be on in KOEO state (key on engine off), if the bulb is burned out everything will still work and the OBDII test computer will show MIL status ON, and if you don't have a computer to tell you that, you must get that light to light in the koeo state.

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Obd mil what does this meen


obd is the diagnosis connector, mil is malfunction indicator light, also known as check engine light

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Failed emissions test


First step is to have the code or codes read.If the "check engine light" is on there will be a reason and should be a code or codes to be read.Once you have the codes,you can determine the correction needed to get that "check engine light" out and a valid emissions test completed.Get back to us with the codes found.

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I have a 2004 tahoe that now is going into reduced engine power everytime I drive it. We have had 2 modules replaced and the tcm and still hasn't fixed the problem. I have had 2 mechanics work on my...


not a chevy expert, but if it goes into Failure Mode Strategy, that is difficult to diagnose, but usually an easy fix when you find it. The engine module very seldom is the cause.

here is what Ford book says:

On Board Diagnostics II System Overview The California Air Resources Board (CARB) began regulation of On Board Diagnostics (OBD) for vehicles sold in California beginning with the 1988 model year. The first phase, OBDI, required monitoring of the fuel metering system, exhaust gas recirculation (EGR) system, and additional emission related components. The malfunction indicator lamp (MIL) was required to light and alert the driver of the malfunction and the need for service of the emission control system. The MIL must be labeled "CHECK ENGINE" or "SERVICE ENGINE SOON." Associated with the MIL was a fault code or diagnostic trouble code (DTC) identifying the specific area of the fault.
The OBD system was proposed by the CARB to improve air quality by identifying vehicles exceeding emission standards. Passage of the federal Clean Air Act Amendments in 1990 has also prompted the Environmental Protection Agency (EPA) to develop on board diagnostic requirements. CARB OBD II regulations will be followed until 1999 when the federal regulations will be used.
The OBD II system meets government regulations by monitoring the emission control system. When a system or component exceeds emission thresholds or a component operates outside of tolerance, a DTC will be stored and the MIL will be illuminated.
Fault detection strategy and MIL operation are associated with trips and drive cycles. Each monitor has requirements for setting and clearing DTCs and for controlling the MIL. These processes, DTC and MIL operation, descriptions of the monitors and the definition of trip and drive cycles are discussed in detail within this section.
The diagnostic executive is the computer program in the powertrain control module (PCM) that coordinates the OBD II self-monitoring system. This program controls all the monitors and interactions, DTC and MIL operation, freeze frame data and scan tool interface.
Freeze frame data describes stored engine conditions, such as state of the engine, state of fuel control, spark, RPM, load, and warm-up status at the point the first malfunction is detected. Previously stored conditions will be replaced only if a fuel or misfire malfunction is detected. This data is accessible with the scan tool to assist in repairing the vehicle.
Powertrain Control Module The center of the OBD II system is a microprocessor called the powertrain control module (PCM). The PCM has a single 88 Pin connector. The PCM receives input from sensors and other electronic components (switches, relays, etc.). Based on information received and programmed into its memory (keep alive memory [KAM], etc.), the PCM generates output signals to control various relays, solenoids and actuators.
Keep Alive Memory (KAM) - The powertrain control module (PCM) stores information in keep alive memory (KAM), a memory integrated circuit, about vehicle operating conditions, and then uses this information to compensate for component variability. KAM remains powered when the vehicle ignition key is OFF so that this information is not lost.

Fail Safe - This system of special circuitry provides minimal engine operation should the powertrain control module (PCM), mainly the Central Processing Unit or EEPROM, stop functioning correctly. All modes of Self-Test are not functional at this time. Electronic hardware is in control of the system while in fail safe operation.


Component Control Fail Safe Condition Operation IAC1 Idle Air Held To Full Open. INJ 1
INJ 2
INJ 3
INJ 4
INJ 5
INJ 6 Fuel injection volume fixed according to driving conditions. Fuel is injected simultaneously into all cylinders once per crankshaft revolution. Timing for the injection is based upon the camshaft position sensor signal. EGR/EVAP* OFF EGR Valve and EVAP Canister Control Solenoid Closed. Ignition Timing Ignition Timing Fixed. HFAN ON High Fan Control Relay Energized. LFAN OFF Low Fan Control Relay Unenergized. ACR OFF A/C Relay Unenergized. MIL ON Malfunction Indicator Lamp On. FP ON Fuel Pump Control Relay Energized (Engine Running).
* Federal emissions
Adaptive Fuel Control Strategy The adaptive fuel control strategy is designed to compensate for variability in the fuel system components. If, during normal vehicle operation, the fuel system is detected to be biased rich or lean, the adaptive fuel control will make a corresponding shift in the fuel delivery calculation.
Whenever an injector or fuel pressure regulator is replaced, keep alive memory (KAM) should be cleared. This is necessary so the fuel strategy does not use the previously learned adaptive values.
To clear KAM, refer to PCM Reset in Section 2B , Diagnostic Methods.
Failure Mode Effects Management Failure mode effects management (FMEM) is an alternate system strategy in the powertrain control module (PCM) designed to maintain vehicle operation if one or more sensor inputs fail.
When a sensor input is perceived to be out-of-limits by the PCM, an alternative strategy is initiated. The PCM substitutes a fixed value and continues to monitor the incorrect sensor input. If the suspect sensor operates within limits, the PCM returns to the normal engine running strategy.

Oct 07, 2011 | Cars & Trucks

1 Answer

Emmissions failed due to the following. OBD Connector Integrity - malfunction indicator light (MIL) status This is for a 2000 chevy lumina


MIL status is error codes, but usually for pre 1995 vehicles. If you check engine light was on, then it would not pass emmissions. Since your vehicle is a 2000, I would suggest you take it by an autoparts store and have them read your error codes before you try to reset them. Make sure you write them down in the order they come off their scanner.

Yu can usually clear error codes by disconnecting your battery.

Jun 27, 2011 | Chevrolet Chevy Cars & Trucks

2 Answers

All of a sudden my car has a miss and lack of power, a stumble when starting off.. The last time this happend it was a coil for cyl 3 & 8. how do I check this out ?


A SCAN TOOL WILL TELL YOU WHAT CYLINDERS MISFIRING.THATS QUICK WAY TO CHECK.CHANGE FUEL FILTER AND CLEAN FUEL INJECTORS BY FILLING GAS TANK AND PUTTING A BOTTLE SEA FOAM IN TANK.MISFIRING LACK OF POWER AND STUMBLING ON ACCELERATION MOST TIME CLOGGED FUEL INJECTORS WILL CAUSE THOSE PROBLEMS.

Jul 12, 2010 | 1995 Oldsmobile Aurora

1 Answer

Check engine light comes on


A malfunction indicator lamp (MIL), commonly referred to as the "Check Engine Light" is an indicator of malfunction of the computerized engine management system. It is found on the instrument console of most automobiles. When illuminated, it is typically either an amber or red color. On vehicles equipped with OBD-II, the light has two stages: steady (indicating a minor fault such as a loose gas cap or failing oxygen sensor) and flashing (indicating a severe fault, that will eventually destroy the catalytic converter, such as a misfire). When the MIL is lit, the engine control unit stores a fault code related to the malfunction, which can be retrieved with a scan tool and used for further diagnosis. The malfunction indicator lamp is usually labeled with the text check engine, service engine soon, check engine soon, or a picture of an engine.
The MIL appeared in the early 80s along with computerized engine controls. Even the earliest systems, such as GM's CCC (Computer Command Carburetor) system had self diagnosis functionality. When the computer detected a fault, it illuminated the MIL. Up until OBDII, on most cars the MIL could output codes, when two pins on the ALDL are jumped, the light would flash the codes, for instance (blink) (pause) (blink) (blink) for code 12. Some manufacturers retained this feature even after OBDII, such as Honda.

Hope this help (remember comment and rated this). Good luck.

May 09, 2010 | 1995 Toyota Camry

2 Answers

What does code 1-p0650 mean?


P0650 Malfunction Indicator Lamp (MIL) Control Circuit Malfunction

Malfunction Indicator Lamp (MIL) is located on the instrument panel. When the ignition switch is turned ON without engine running, MIL will light up. This is a bulb check. When the engine is started, MIL should go off. If MIL remains on, the on board diagnostic system has detected an engine system malfunction.

Possible Causes:
  • Harness or connectors (MIL circuit is open or shorted.)
  • MIL bulb may be faulty
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