Transmission not shifting with a darn?

Have you checked for trouble codes? Is the D4 light flashing while driving? This guide can help us fix it

https://www.2carpros.com/articles/automatic-transmission-problems

Please run down this guide and report back.

We work on what you have provided and without any information, we won't be able to help you.

Hi accord1996,

Check the throttle control cable adjustment for the trans. If it is adjusted too short, shifting would be slow and engagement results in shocks.

Hi Joe,

The throttle cable is connected from the throttle body to the transmission at front near the lower radiator hose. Adjusting is via the nuts as shown in the diagram.

Loosen the upper nut until there is some slack on the cable at the throttle body side. Slowly tighten the nut till the slack is just removed and then tighten the lower nut till it locks.

The throttle cable should be synchronised to operate in tandem with the throttle opening of the intake manifold.

Since you are not familar with the adjustment, mark the initial position first so that you know how much you have adjusted. You might need a few tries to get the desired position. After each adjustment, test drive the vehicle first.

Btw if the shifting is erratic, it could be caused by a bad throttle position sensor. You would have to test the sensor and the best way is to use a diagnostic machine. Manual testing would require a DVOM and a wire harness.

You adjusted the wrong cable. This cable comes out from the cabin. If you pull at this cable to move the throttle valve, the other cable is moving at the transmission end, activating a lever.

The cable to be adjusted should be from the throttle body to the transmission near lower radiator hose. Adjust is at transmission side.

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I am a moderator of 2carpros so I have access to Mitchell1. It is imperative that such data are available to us, otherwise it would not be easy for us to answer any questions.

Try this link if you are interested.

Hi there,

This could be a pressure problem, a sticky shift valve or solenoid, I would be getting a transmission specialist to do a service & report on this transmission.

Mark (mhpautos)

Before adjustment, check if there is any slack in the cable at the throttle side. While pushing the lever at transmission end to prevent it from moving upwards, lightly push at the throttle body end to check for free play of the cable. If there are any, adjustmnt is required.

Quite often the nuts will get stuck and some rust remover (WD 40) is required. Allow to soak for a while and it would be best to have 2 open end spanners (12 mm ) and a plier to hold the casing after the nut is loosened.

Hi getterobo,

Thank you for the donation.

When the CEL comes on, an error has been detected and you need to retrieve the trouble codes to understand what is causing the problem.

Autozone provides free scanning to retrieve trouble codes. Let me know the exact trouble codes and we shall continue from there.

You have a problem with the mainshaft speed sensor and here are the diagnostic procedures.

DTC P0715: (FLASH CODE 15) MAINSHAFT SPEED SENSOR
NOTE:
DTC P0715 (FLASH CODE 15) doesn't always mean an electrical problem in mainshaft speed sensor or circuit; this DTC can also be caused by a mechanical problem in transaxle.

1 . Ensure mainshaft and countershaft speed sensors are installed properly. Disconnect mainshaft speed sensor connector and measure resistance between sensor connector terminals.

2 . If resistance is not 400-600 ohms, replace mainshaft speed sensor. If resistance is 400-600 ohms, disconnect PCM 25-pin connector "B". Check continuity between ground and PCM 25-pin connector "B" terminals No. 15 (Orange/Blue wire) and No. 14 (White/Blue wire).

3 . If continuity exists, repair short to ground in Orange/Blue and White/Blue wires between PCM and mainshaft speed sensor. If continuity does not exist, reconnect mainshaft speed sensor connector. Measure resistance between PCM 25-pin connector "B" terminals No. 15 (Orange/Blue wire) and No. 14 (White/Blue wire).

4 . If resistance is not 400-600 ohms, go to next step. If resistance is 400-600 ohms, perform DTC P0720 (FLASH CODE 9) diagnostic, check for loose PCM connectors and replace PCM with known good part, as necessary.

5. Disconnect mainshaft speed sensor connector. Check continuity of Red wire between PCM 25-pin connector "B" terminal No. 15 (Orange/Blue wire) and mainshaft speed sensor connector. If continuity exists, go to next step. If continuity does not exist, repair open Orange/Blue wire between PCM 25-pin connector and mainshaft speed sensor connector.

6 . Check continuity of White wire between PCM 25-pin connector "B" terminal No. 14 (White/Blue wire) and mainshaft speed sensor connector. If continuity exists, check for loose PCM connectors and replace PCM with known good part, as necessary. If continuity does not exist, repair open White/Blue wire between PCM 25-pin connector and mainshaft
speed sensor connector.

Hi sobhy,

It could be due to trans internal fault or the Transmission Control Module. The next time it occurs, try decelerating to see if it upshifts.

Manually shift from 1, 2, D3 and D4 and note if the trans shifts accordingly.