Question about 2005 Chevrolet Malibu

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2005 Malibu-Malfunction check engine lamp

The system called OBD (on board diagnostics) is flashing. The engine won't stay on, but if you keep the rpm above 100 rpm or above then it will stay running. Below that it runs rought, but also I had to get it home so driving it was not good, because it pick up speed slow, and it ran rought. I check the book that came with the car and it say that it could be a misfire or emiission control system problem. I replace all the emission control fuse under the hood and in the car fuse box, and also in the truck. The fuel is low, but I did stick alittle more in it, because the book says it could be bad fuel. My next step is to go to the auto discount store and get one of those cans of fuel that gets water or other problem with fuel out I HOPE this will work. If not can you tell me want else to do with little money to take it to a car shop to fix it. e-mail address is

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Take the car to autozone or a different parts store that will scan the computer for free to see what code has been set to turn on the light. That way you know what you're dealing with. If you do anything elce before seeing why the light is on you're just taking shots in the dark.

Posted on Oct 24, 2008


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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 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.

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1 Answer

Check engine ligth comes on and stays on. The car is running a little rough now too. Both problems started this morning.We had our mechanic do a tune-up on the car about a year ago.

When a 'check engine light' (MIL=Malfunction Indicator Lamp) is turned on, there is a DTC (Diagnostic Trouble Code) set/stored in the ECM/PCM (Engine Control Module/Powertrain Control Module). This code identifies which engine management system component/function experienced a malfunction. Once you pull/read this code, you may begin diagnosis.

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1 Answer

2005 hyundai sonata. The check engine light is on. The rmp gauge keeps going back to zero. The car is starting to hesitate.

When a 'check engine light' (MIL=Malfunction Indicator Lamp) is turned on, there is a DTC (Diagnostic Trouble Code) set/stored in the ECM/PCM (Engine Control Module/Powertrain Control Module). This code identifies which engine management system component/function experienced a malfunction. Once you pull/read this code, you may begin diagnosis.

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1 Answer

Check engine light is on and my car hesitates when accelerating. Sometimes the check engine light will blink (instead of just stay on steadily) during moments of hesitation/acceleration.

When a 'check engine light' (MIL=Malfunction Indicator Lamp) is turned on, there is a DTC (Diagnostic Trouble Code) set/stored in the ECM/PCM (Engine Control Module/Powertrain Control Module). This code identifies which engine management system component/function experienced a malfunction. Once you pull/read this code, you may begin diagnosis.

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Does a 91 toyota camry have an outlet for a diagnostic code reader? It is a Can OBD2 diagnostic code reader

Hi, OBD2 didn't start until 1996, but you can extract your codes manually. You have to run a jumper in the data link connector under the hood. See procedure below. If you can tell me which engine you have, I may be able to provide the table of codes.

1982-95 MODELS All models except the 1MZ-FE engine is equipped with OBD I till 1995.

  1. Make sure the battery voltage is at least 11 volts.
  2. Make sure the throttle valve is fully closed.
  3. Place the gear shift lever in Neutral. Turn all accessories off.
  4. The engine should be at normal operating temperature.
  5. Using a jumper wire, connect terminals TE1 and E1 of the Data Link Connector 1 (DLC1).
  6. Turn the ignition switch ON , but do not start the engine. Read the diagnostic code by the counting the number of flashes of the malfunction indicator lamp.
  7. Codes will flash in numerical order. If no faults are stored, the lamp flashes continuously every 1 / 2 second. This is sometimes called the Normal or System Clear signal.
  8. After the diagnosis check, turn the ignition OFF and remove the jumper wire.
  9. Compare the codes found to the applicable diagnostic code chart. If necessary, refer to the individual component tests in this section. If the component tests are OK, test the wire harness and connectors for shorts, opens and poor connections.

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      I have code p0507 & p2187 on my 2004 Saab 93 the idle is rough

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      Rich Mixture = Too much fuel, not enough air
      Lean Mixture = Too much air, not enough fuel

      To keep the engine running properly, the Engine Control Module measures the oxygen content in the exhaust with oxygen sensors and makes adjustments to the mixture by injecting more or less fuel.

      P0507 Idle Control System RPM Higher Than Expected

      P2187 System too lean at idle

      Things to check:
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      2. Fuel pressure, fuel pump flow rate

      Do you have cold air intake?

      Run a fuel system cleaner first and reset software. Long Term Fuel Trim Additive. Max Value, Air/Fuel too Lean.

      Fault symptom

      Malfunction Indicator

      The engine may stop after starting, run unevenly and misfire or run
      at high rpm.

      On-board diagnosis

      Type of


      Enable criteria:

      The engine has started and lambda control is active.An additive adaptation is
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      Fault criteria:

      The additive adaptation factor is greater than 5.25%.

      Diagnostic help


      Checking air/fuel ratio. With this DTC, the engine will be getting too much air or too little fuel.IMPORTANTA crankcase ventilation leak may be one reason as to why a DTC is set. Check crankcase ventilation function before starting regular troubleshooting.

      Functions in the diagnostic
      tool related to the fault:

      Test value:
      •O2S1 lambda
      •Short Term Fuel Trim
      •Purge Adaptation
      •Airmass Deviation
      from Calculated
      •Total Fuel Trim Here's a helpful link for you:

      You most likely have a vac leak. Hope this helps Fix Ya! Show some love with positive feedback if this brings you to a solution. Thanks Happy Hanna-kwanz-mas

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      Let us know the codes and a summary of the print-out. We can assist from that point (free).

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