Question about Oldsmobile Delta 88

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Delta 88 5L 307 ECM not working

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?

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  • Oldsmobile Master
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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.

Posted on Jun 08, 2014

Testimonial: "The check engine light is on all the time even when I short pin 1 AND 2 OR even when the ECM is unplugged? Could a bad or wrong PROM cause this problem? The engine runs too rich at times, however it does allow the AC to work."

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: 1983 buick skyhawk 2.0 with TBI not sparying fuel

change the crank sensor.No the ECM has no internal oil components

Posted on Jul 08, 2009

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


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


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

Posted on Jan 27, 2010

  • 192 Answers

SOURCE: I am not getting a

The fuel pump relay is powered by a fusible link connected to the starter solenoid on the positive battery terminal. That fusible link feeds the 10 amp fuse near the relay. You can test the fusible links with a 12 volt test lamp. If the fusible link test okay check for an open circuit in the wire between the link and the 10 amp fuse. Hope this gets you fixed.

Posted on Jul 04, 2011

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SOURCE: 1995 Oldsmobile cutlass ciera automatic transmission not shifting.

I would say to go to and register your vehicle for free wiring and fuse box diagrams.

Then do a dedicated search of the diagnostic plug to the ECM. There is also the possibility of a bad Torque converter.

There should be a pressure port the mechanic can test to see what the Torque converter is doing. Before the shift solenoids can work, they need pressure to turn the transmission. The Torque converter will likely not show up on an electric test, except for its Lockup device. The Torque Converter is simply a Hydraulic pump that needs to work for the transmission to turn normally.

Posted on Oct 21, 2012

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SOURCE: 2003 cavalier turn signal fuse

The 10A TURN-B/U fuse in the instrument panel fuse block feeds the turn/hazard flasher and the back-up lamps. There could be a short in the flasher, the turn signal/multifunction switch, or the lamps/sockets. There also could be a short in the back-up lamp circuit

Posted on Oct 28, 2012

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Shift light flashing no OD Changed Trans ecm/pcm shift hold light button, coil No change. CYL missfire, 2 & 3 Diagnostics code on Trans is u0401 Invalid data received from ecm/pcm/a

Circuit Description
Modules that are connected to the shared communication circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have pre-recorded information about what messages are needed to be exchanged on the serial data circuits for each virtual network. The messages are usually supervised and some periodic messages are used by the receiver module as an availability indication of the transmitter module.

DTC U0401 TCM received invalid data from ECM
Conditions for Setting the DTC
The transmission control module (TCM) detects an invalid throttle position signal, engine speed signal and/or engine coolant temperature signal for more than 2 seconds.

Action Taken When the DTC Sets
• The TCM will store the DTC when a failure is detected on the first ignition cycle.
• The TCM will illuminate the HOLD lamp.
• The TCM can no longer determine the validity of any information it may or may not receive from the engine control module (ECM). Therefore the TCM substitutes default values for engine speed, throttle position, and other engine data signals.
• Transmission operation will be reduced, affecting shift points, torque converter clutch operation, and other driveability concerns.

Diagnostic Aids
• An intermittent malfunction may be caused by a fault in the electrical circuit. Inspect the wiring harness and the components for an intermittent condition. Refer to Intermittent Conditions in Engine Controls 1.6L.
• Repair any electrical circuit faults that were found. Refer to Wiring Repairs in Wiring Systems.
• Faulty ECM and/or TCM

Install a scan tool.
Turn ON the ignition, with the engine OFF.
Save the DTC and Freeze Frame information into the scan tool memory.
Perform the scan tool Clear DTC Information function for the transmission control module (TCM) and the engine control module (ECM).
Operate the vehicle for 1 minute or until the MIL illuminates.
Check the TCM for DTCs.
Is the Malfunction Indicator Lamp (MIL) On?
YES - Go to Step 2
NO - Repair the wiring connectors for intermittent failure

Select request DTC status from the Diagnostic Trouble Codes Information menu
Request DTC by status
Is DTC U0401 displayed?
YES - Go to Step 3
NO - Repair the wiring connectors for intermittent failure
Turn OFF the ignition.
Disconnect connector A from the TCM.
Turn the ignition ON, with the engine OFF.
Measure the resistance between terminal A17 of the TCM wiring connector and terminal K14 of the ECM wiring connector.
Measure the resistance between terminal A7 of the TCM wiring connector and terminal K15 of the ECM wiring connector.
Was the resistance the specified value for both circuits?
0 ohms
YES - Go to Step 5
NO - Go to Step 4

Mar 19, 2016 | 2005 Chevrolet Aveo

1 Answer

Shift light flashing changed transmission \coil ecm\pcm transmission module diagnostics cyl missfire invalid data u0401

First is year make and model. A U code is data communication codes. Sorry to say, you could have done all this and it could have just been a bad wire.

Mar 19, 2016 | Cars & Trucks

1 Answer

Why is my ECM not working

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

May 16, 2014 | Oldsmobile Delta 88 Cars & Trucks

1 Answer

Bad transmition, the car wonte will not go in drive or reverse, just revs up real high

code p0743 refers to torque converter clutch solenoid-electrical=== causes wiring--clutch solenoid ECM/TCM
code p0750 refers to shift solenoid--A circuit malfunction=== causes wiring --- shift solenoid --ECM/TCM
code p0755 refers to shift solenoid B --circuit malfunction=== causes -- wiring---shift solenoid ---ECM/TCM
First is to check the wiring and connections are in good condition. next is to replace the clutch solenoid for the torque converter and work up from there

Jun 06, 2013 | Mazda 626 Cars & Trucks

1 Answer

I have a 1992 dodge diesel 3/4 ton pick up. I have owned it since new. It has been an awesome truck with very few problems. When the truck was about 5 years old I had to replace the TPS. It was continually...

you are correct as a single blade connection is mostly the temp gauge sender as the gauge grounds out through the variable resistance in the sender unit
most coolant temp sensor units have 4 wires in a square shaped plug and are generally in the same vicinity
I am at loss as to any transmission problems coming from a coolant sensor problem as the purpose of that unit is to report the engine coolant temp so that the ECM can adjust the air/fuel mix, turn on the radiator fans
There may be an transmission temp sensor to report to the ECM when the transmission overheats and that would put on the engine light
It appears that the recurring problem has again surfaced
but check harness connections for corroded pins , water ingress, and check the transmission control module for connections and operation
you may also check the vacuum actuator and hose for leaks and correct operation as that unit will attempt to change ratios as the throttle setting alters

Mar 04, 2017 | 1992 Dodge Ram 350

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).

Aug 10, 2010 | 1990 Nissan Maxima

1 Answer

99 ford taurus car will not hold back going down

I would start with the 'PCM', or Power Control Module. You will have to take it to a garage with diagnostic capabilities to have this checked. The PCM controls how and when your car shifts, what RPM's it shifts at, etc......

Mar 13, 2010 | 1999 Ford Taurus

2 Answers

I have a 94 4runner and I ran the diagnostic and its a 42 code for the OD/off and engine 42. It doesn't shift into over drive sometimes and it'll blink OD/off every now and then, and the speedometer...


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


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

Jan 27, 2010 | 1994 Toyota 4Runner

1 Answer

88 chevy c 1500. The tranny will not shift to OD

yea thats possible, the trans has servos that change gears, have a diagnostic done at a trasmission shop, a quick hook up to a computer will tell if there are any servo faults, it may be a minor issue and just needs a adjustment, or could be a sign that the whole trans is on its way out. but you should have it checked as soon as possible. good luck and take care

Jan 15, 2010 | 1988 Chevrolet C1500

1 Answer

4L60E Shifts fine in 1st, 2nd, & 3rd but will not shift into OD

The EMC detected and problem so it's in limp mode, As long as it's in limp mode the 4th and OD will not activate. Take care not to burn up the transmission by running it hard while your in the limp mode.
Your going to have to get the truck scanned to clear any codes and why there are DTC codes. Auto Zone scan for free and most auto shops charge $10.00 to $20.00 to scan sine they want the business.
If you want to clear the codes your self you can put the ignition to the run position and pull the ECM (Batt) fuse out for 20 sec and place it back in then start the truck. It may stall but let it, just start it again and this would have cleared all the DTC code history.
The transmission should be running fine unless there is a problem and the service engine light will be on again and you'll be in limp mode still with an updated DTC in the ECM.
Good luck and hope this helps.

May 26, 2009 | 1996 Chevrolet K1500

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