Question about 2004 Isuzu Rodeo

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Reduced performance and "Reduced Engine Power" dummy light is on.

I have already replaced the throttle body, and the only noticeable difference it made was in my bank balance.  So, (I'm told) that the problem MUST be in my mass airflow sensor.  Is there a way to test this unit OFF the vehicle with a multi-meter or a jack-hammer or something??? 
Please feel free to call directly at (808) 723-4288  Warren

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  • drzera Jun 19, 2009

    i dont have a code reader.  is there another way to test the MAS?
    Also, how do i test the catylitic converter??
    does the catylitic conv need to be on (mine has been removed by previous owner) in order to run well?

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  • Isuzu Master
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The MaF sensor is inexpensive and easy to chage.

If you are having power problems more than fuel problems, check your exhaust at the tailpipe for the smell of sulpher andwheezing. The exhaust should stop the minute the engine is shut off. Using a tissue you can pick up any exhaust movement after shutdown, Like a real low draft. If so, Consider having the catalyctic converter chk'd for restriction. When they plug up the engine can't breath and loses its power. The MAF sensor cause eratic idling and jerky acceleration.. It's the first sensor in the duct coming out of the air cleaner. Good Luck. - Ned

Posted on Jun 18, 2009

  • Ned C Cook
    Ned C Cook Jun 19, 2009

    Warren, The maf sensor can be cleaned. using carb cleaner spray rinse out all the orifices . do not fill holes or let it collect . Just flush the dirt out. Maf sensors run around $100 so the dealers include cleaning it on their tune ups. My error i Your Cat converter is part of the emmissio control system and it missing will be picked up on a smog test. Functioning properly it won't affect the cars performance. So, it would be wise to have it replaced at a muffler shop.The MAFis a stationary part , a tube the air cleaner duct is connected. It's only about 5 in log. and looks like it has a horn in the middle of it.. a velocity tube..Just clean it.- Ned

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  • Contributor
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Get a code reader and see if there is a problem

Posted on Jun 18, 2009

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Reduced engine power


Have the vehicle checked for DTC'S - diagnostic trouble codes ! Do you know what electronic throttle control is ? The gas pedal assembly has electrical connector an sensors inside ,hooked to the PCM / ECM - engine computer . The engine computer uses these position sensors inputs to control the DC motor on the throttle body to open the throttle plate to control the speed . Plus there are position sensors inside the throttle body to input PCM/ECM to see if it's calculations are corect . Your best bet maybe to take it to a qualified repair shop .
Drive by Wire Function and diagnostics by Wells

Reduced Engine Power Mode
When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The control module will perform the following actions:
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• Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.

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2006 chevy impala traction control


Reduced power is a problem with electronic throttle contol . drive by wire . Do you know what this is ? Taking the vehicle an having it hooked up to diagnostic tool an checking for DTC'S - diagnostic trouble codes is always a first step when trying to find the root cause of any trouble light ! And not auto zone , pep boys , or advance auto parts . Thier diagnostic tool will not check codes in all system control modules .

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The reduced engine power light is on in my 2005 Chevy Cobalt. In addition, it's sounds as though it's barely running. Any idea what it can be? The check engine light is on also, however I addressed...


The check engine light being on now is a different problem , Have DTC'S - diagnostic trouble codes checked ,will have something to do with electronic throttle control . That is what reduced engine power is about . It's in a reduced power mode.
Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned off.
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Do you know what electronic throttle control is ?
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Throttle Actuator Control (TAC) System Description

The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
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• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
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• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The engine control module (ECM)

Your best bet , take it to a qualified repair shop .

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2 Answers

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The reduced engine power happens because there is a problem with the electronic throttle control . Some people call it drive by wire ! The gas pedal has sensors inside , position sensors , connected electrical to the PCM - engine computer , the throttle body on the engine has a DC electric motor an also has position sensors . These are also connected to the PCM electrical . The PCM reads the position sensors which indicate how much your pressing on the gas pedal . then hopefully it opens the throttle the same amout .

The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system includes the following components:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The engine control module (ECM)

Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control, however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control, however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn OFF the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF
- Ignore the accelerator pedal input
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.

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