Multi pin connectors

Hi,

The connector pins are from the front, male or female connector. Is that what you mean?

I attached a connector picture of the ECM for your vehicle below. That is with the connector disconnected and you are looking into the connector.

Let me know if you have other questions.

Take care,

Joe

See pic below.

That is the ECM. In most cases when it is a connector, wiring is shown at the connector. I don't want to say all the time, but most of the time. See pic 1 below.

By chance, is this the vehicle in Florida? Let me know. Sorry to ask, but I just remembered a vehicle similar to this being there. LOL

Let me know.

Joe

Hi,

I had a feeling that it was you. LOL Welcome back and boy do I wish I was in Florida. It's 20 degrees here and waiting for a bad snowstorm tomorrow. Ugh!

Regardless, when you place it in drive, does the indicator show D? I ask because I'm questioning if the transmission range sensor is bad. Here is how it works.

The transmission range sensor has six separate resistors in series. Each resistor has an output connection corresponding to a transmission position (P, R, N, D, 1, 2).

The PCM applies a 5.0-volt reference signal to the TR pin 30. The signal return circuit, pin 46, supplies a ground path to the sensor. As the transmission is shifted, the TR sensor output wiper arm moves to a corresponding resistor connection (based on gear selection). The six inline resistors provide a separate voltage drop for each transmission position. Based on the voltage signal, the PCM identifies the current transmission shift lever position.

So, I suspect that either the TR has failed, the linkage isn't fully placing the TR in the drive position, or there is an electrical issue. However, if there is an issue within the circuit, I wouldn't think it would be limited to just reverse.

If you look below, I attached the diagnostics for testing. Pic 1 indicates the use of a breakout box, which most people don't own. Since that is the most likely case, you will need to check the return signal resistance at the PCM or the sensor itself.

Pic 2 shows the resistance based on gear selection. Pics 3 and 4 provide the location and directions for removal and replacement. Pic 5 is a pinout of the PCM. I highlighted the pins involved. Pin 30 provides the 5v reference and pin 46 is the signal return pin.

Since the vehicle sits a lot, you may want to confirm there isn't a corrosion issue on the connectors as well.

I hope this helps. Stay warm and let me know if you have other questions.

Take care,

Joe

See pics below.

I thought 20 degrees was bad. No thanks to the neg 10.

I need you to check pin 30 for a 5v reference from the ECM. Also, did you confirm a ground path via pin 46?

Note: I accidentally highlighted the wrong pin above. It should be pin 30 (not 39) that provides power. Also, if you haven't already, disconnect the connector at the ECM and inspect it for damage or corrosion.

As far as testing the ECM, see if there is power and ground for the circuit. If there is, it's good. If there isn't, check wiring between the sensor and ECM for continuity.

Let me know.

Joe

Hi,

I don't see why that wouldn't work for testing.

Let me know the results.

Joe

Shifting is controlled by the powertrain control module (PCM). The PCM uses information from the speed sensor, throttle position, engine load, speed, and so on.

If the vehicle is shifting erratically, it could be the speedo drive gear, a problem with the fluid itself, or within the valve body. See pic 1 below.

I can't remember, but was line pressure tested? Have you noticed anything related to the speedometer? I likely already know the answer to this, but is the fluid clean and full?

Let me know.

Joe

See pic 2 for a better description of how it works.

Hi,

You could remove the valve body and inspect it. There are shift solenoids that may be sticking, but that should set a diagnostic trouble code.

Let me know your thoughts. I'll help in any way I can.

Joe

PS: I hope you are enjoying Florida. I have to go plow my driveway now but will be back soon. LOL

Hi,

I'm not too sure about that one. If there is a place, will they guarantee it will not damage the system? I know in the old days; people would do that with their engines to clean it out. It worked as far as I know. However, I never heard of it with a transmission. I suspect for a very short period of time; it would lubricate enough to prevent damage. Just don't drive it long like that.

You know, 50 degrees sounds good. LOL Tonight we're down to 2. I love PA. LOL

Take care,

Joe

Hi,

I'm glad to hear that. LOL I was questioning it. Let me know how things turn out for you.

Joe