Question about Oldsmobile Delta 88

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Why is my ECM not working

5L 307, ECM number is 1227076 check engine light on continiously. Not only will it not enter diagnostic mode, it is not working as it will not shift into OD. I changed the ECM unit and it's still the same. The fuses are all good and the unit has power. What external signal can prevent the ECM from functioning? Where can I get a pinout diagram?

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  • 108 Answers

It would help if you would include the year of car. If it is pre 95, Test jump A and B terminal at diagnostic plug with ignition ON. The engine light should flash. One of these terminals is ground and the other goes to the computer. Ground the one that goes to computer and the light will flash. If not, the wire is open to computer

Posted on Jun 09, 2014

Testimonial: "1985 delta 88 5L 307. Pin A has ground and pin B does connect to the ECM as I read about 4 volts until I ground it. The check engine light is on even when the ECM is unplugged, I don't know if that is normal."

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relace the throtle air idle valve.The temp switch will allso cause this problem.

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SOURCE: I have a 94 4runner and I ran the diagnostic and

Hi,

Code #42 on the 4Runner denotes a problem with the Vehicle Speed Sensor (VSS) circuit.

It means the ECM did not detect a signal from the VSS, above 2,200rpm....which might explain the speedo issue - Does your speedo play up, only when engine running above 2,200rpm or 2,700rpm?

Areas to check (in this order) are:

- Open (or short) in the VSS circuit
- faulty VSS sensor
- ECM fault within VSS circuit


Cheers,

"If this has helped you, please rate this solution" :-)

Posted on Jan 27, 2010

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I changed everything on a 2007 Chevy uplander the camshaft position sensor And the purged sensor And the throttle body and still the check engine light and the reduce engine power came back on


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.
Did you have it checked for DTC's - diagnostic trouble code's related to the reduced engine power ?
All so has APP sensor gas pedal !
Accelerator Pedal Position (APP) Sensor
The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits:
?€¢
A 5-volt reference circuit


?€¢
A low reference circuit


?€¢
A signal circuit

The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases to more than 4 volts as the pedal is actuated. The APP sensor 2 signal voltage at rest position is less than 0.6 volt and increases to more than 2 volts as the pedal is actuated.
Your best bet is take your vehicle to the dealer !
al

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Why do I have no throttle response on my 08 Saturn aura


Your vehicle has electronic throttle control , controlled by the engine computer .Do you have any messages come up on the DIC - driver information center Reduced Engine Power
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode.
Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle positioning the throttle position, or by controlling the fuel and spark if the throttle is turned OFF.
- Ignore the accelerator pedal input. Have it check for DTC'S - diagnostic trouble codes

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1 Answer

I have a 2003 Cadillac CTS. It continues to go into reduced power mode. How do I correct that.


Are you getting a ENGINE POWER REDUCED message ? Is the check engine light on ?
Reduced Engine Power Mode
Throttle Actuator Control (TAC) System
electronic throttle control .
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:
?€¢
Limited torque


?€¢
Limited range of throttle movement


?€¢
Engine OFF


Your going to need to take this to a ASE certified repair shop or the dealer , you probably don't have the diagnostic tools to trouble shoot this problem.
https://youtu.be/oPPLAHSSluw

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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:
- Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
- Ignore accelerator pedal input.
• Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.

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1 Answer

Delta 88 5L 307 ECM not working


The ECM is functioning but the problem is the way the data is being communicated to the scanner. There are several different procedures to follow when reading scanners so ensure that your connecting cables are right for you ECM and scanner.

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How to read the engine codes without a Nissan CONSULT or scan tool. (Set ECM in Diagnostic Test Mode II) Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds....


there is a screw on side of the ECM. turn screw counter clockwise all the way and monitor dash board/check engine light on and count the number of flashes on dash board. when you are done turn the screw back into original spot.

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1 Answer

2007 chevy avalanche,leaves me stranded or limping home about every 6 months,first code says, traction control off,next code says ,service stabilitrak and the last code says...engine power reduced.its been...


These are not codes , they are warning lights , telling you the driver that a problem exist . code says, traction control off,next code says ,service stabilitrak and the last code says...engine power reduced. DTC'S - diagnostic trouble codes could be stored in the control modules that control these system's . The main problem is more then likely with the reduced engine power. This is because of a problem with the electronic throttle control system . This problem will turn off these other thing's , turning on their light's .
Throttle Actuator Control (TAC) System Description
All newer vehicles have this ! There are position sensors in the Gas pedal and on the throttle body on the engine , The computer uses a DC volt electric motor to make the vehicle go . The sensors wear over time , the motor can wear , wiring can break etc...
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.
© 2017 General Motors Corporation. All rights reserved

I work at a chevy dealer an can not believe the one you took it to can't find the problem . Where is this dealer ? I will have a long talk with my district rep.
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Where is the plug to plug a scanner in on a 1988 buick reatta


The diagnostic port on the '88 Reatta is located under the driver side of the dash to the right of the steering column. Very cool car by the way.


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1 Answer

Looking for adaptor to scan trouble codes 1990 maxima v6


How to read the engine codes without a Nissan CONSULT or scan tool. (Set ECM in Diagnostic Test Mode II)
  1. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
  2. Repeat the following procedure quickly five times within 5 seconds.
    1. Fully depress the accelerator pedal.
    2. Fully release the accelerator pedal.
  3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIL starts blinking.
  4. Fully release the accelerator pedal.
  5. ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).

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I have an 88 S10 2.8L Auto trans. Stalling @ a stop


This system does not require the use of special diagnostic equipment for testing. A digital voltmeter with 10 megohm impedance, an ohmmeter capable of low level readings, a tachometer, test light, hand vacuum gauge and pump and jumper leads are required.

To extract a trouble code from the ECM for diagnostic purposes, the Assembly Line Communication Link (ALCL) connector, is used.

The ALCL diagnostic connector is located in the passenger compartment. Terminal B of the connector is the test terminal and terminal A is the ground used for diagnostic display.

If the test terminal is grounded with ignition on and engine not running, the system will enter the diagnostic mode. In this mode, the ECM will display a Code 12 three consecutive times by flashing the "Check Engine" or "Service Engine Soon" light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession. After Code 12 is displayed, any stored trouble codes will be displayed three times each by flashing the "Check Engine" or "Service Engine Soon" light, then Code 12 will be displayed again. In the diagnostic mode, the ECM will also energize all ECM controlled relays and solenoids.

After determining the trouble code(s), refer to "Trouble Code Identification."

If the test terminal is grounded with the engine running, the system will enter the field service mode. In this mode, the "Check Engine" or "Service Engine Soon" light will indicate whether the system is in open or closed loop operation. If the system is in open loop operation, the light will flash approximately two and one-half times per second. Closed loop operation is indicated by the light flashing approximately once per second. In closed loop operation, the light will stay out most of the time if system is too lean and remain on most of the time if system is too rich.
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