Question about Oldsmobile Delta 88
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?
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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Posted on Jan 02, 2017
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
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Posted on Jan 27, 2010
Tips for a great answer:
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 !
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Limited range of throttle movement
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.
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