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I have a 30-40le transmission and i am fitting an after market TCU but i need to know which are solenoid 1, solenoid 2 and the lock up solenoid?

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  • yadayada
    yadayada Nov 06, 2012

    You can also get the inf here for a small fee alldatadiy.com

  • slr7leroux
    slr7leroux Nov 07, 2012

    Thank you Dennis for your advice, however i live in Zimbabwe and the dealers don't seem to know or are unwilling to part with the information. I have taken to guessing and think the lock up solenoid is at the front, solenoid 1 is at the centre and solenoid 2 is at the rear. Wish me luck.

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Go to the dealer and ask to see the information from the parts book.

Posted on Nov 06, 2012

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1 Answer

Transmission won't shift from third to drive


Well the first thing we need to know is if the trans is manual or automatic. I'm assuming auto. Make sure fluid is at correct level. An auto transmission is a glorified hydraulic pump. No fluid , no movement. The next thing to tackle would be the transmission solenoid(tcm, TCU, solenoid are common names to part) if the solenoid gets stuck. So does the transmission.

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Jul 29, 2014 | 1993 Nissan Pathfinder

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92 honda lx automatic is surging, not shifting right


Can be a few things. 1) Check the shift solenoids on top of the transmission (front). Remove them and clean out the screens. This would mean your transmission fluid is over due for changing. 2) Maybe it's the Vehicle Speed Sensor (VSS), locate and change that. It's on top of the transmission back under the thermostat area. 3) It could be your Transmission Control Unit (TCU). It's under the floor carpet on your passenger side near the firewall. There is a metal plater covering your ECU and your TCU. The TCU is the smaller box. Remove it, open it and look for burnt items. If you're handy you can replace those items. If you are replacing the unit, make sure it is from a known good one and it matches your car exactly, ie: EX, LX, DX, SE, sport shift button present?, etc... on the circuit board.

Below is a picture of the TCU opened up, here are the transmission codes that your car can display if you are inclined to jump the OBD wire plug to get the reading.

TCU Codes:

CODE LIST:

1-Lock-up solenoid 'A' circuit open or shorted.
2-Lock-up solenoid 'B' circuit open or shorted.
3-Throttle Position Sensor circuit open or shorted.
4-Vehicle Speed Sensor open or shorted - No signal from speedometer.
5-Shift Lever Position Switch circuit shorted.
6-Shift Lever Position Switch circuit open.
7-Shift Solenoid 'A' circuit open or shorted.
8-Shift Solenoid 'B' circuit open or shorted.
9-Counter shaft or transmission speed pulse generator open or shorted.
10-Coolant Temperature Sensor open or shorted.
11-Engine RPM (Ignition coil signal) open or shorted.
12-(No code 12 used)
13-Main shaft speed pulse generator open or shorted.
14-Linear (line pressure control) solenoid open or shorted.
15-Kick down switch circuit shorted.

064bef5b-bee7-4ef7-9ccb-98c692c687bc.jpg

Oct 12, 2013 | 1992 Honda Accord

2 Answers

D4 lite flashes


Flashing D4 light is an error from the TCU (transmission control unit), so you got something going on with your transmission. If you want to pull the error code, remove the passengers side kick panel and look for a pair of wires with a blue connector at the end. Stick a paper clip or some other piece of wire into each hole of the connector to short the wires. Put your key in the ignition and turn 2 clicks. The D4 light will flash the code...short flashes=1 and long flashes=10. Add the number of short and long flashes to get your code. Errors are below:

0-Transmission control unit (TCU) faulty.
1-Lock-up solenoid 'A' circuit open or shorted.
2-Lock-up solenoid 'B' circuit open or shorted.
3-Throttle Position Sensor circuit open or shorted.
4-Vehicle Speed Sensor open or shorted - No signal from speedometer.
5-Shift Lever Position Switch circuit shorted.
6-Shift Lever Position Switch circuit open.
7-Shift Solenoid 'A' circuit open or shorted.
8-Shift Solenoid 'B' circuit open or shorted.
9-Counter shaft or transmission speed pulse generator open or shorted.
10-Coolant Temperature Sensor open or shorted.
11-Engine RPM (Ignition coil signal) open or shorted.
12-(No code 12 used)
13-Main shaft speed pulse generator open or shorted.
14-Linear (line pressure control) solenoid open or shorted.
15-Kick down switch circuit shorted.

Hope helps.

Aug 03, 2011 | 1992 Honda Accord

1 Answer

The "D" light is blinking regard less where the


Flashing D4 light is an error from the TCU (transmission control unit), so you got something going on with your transmission. If you want to pull the error code, remove the passengers side kick panel and look for a pair of wires with a blue connector at the end. Stick a paper clip or some other piece of wire into each hole of the connector to short the wires. Put your key in the ignition and turn 2 clicks. The D4 light will flash the code...short flashes=1 and long flashes=10. Add the number of short and long flashes to get your code. Errors are below:

0-Transmission control unit (TCU) faulty.
1-Lock-up solenoid 'A' circuit open or shorted.
2-Lock-up solenoid 'B' circuit open or shorted.
3-Throttle Position Sensor circuit open or shorted.
4-Vehicle Speed Sensor open or shorted - No signal from speedometer.
5-Shift Lever Position Switch circuit shorted.
6-Shift Lever Position Switch circuit open.
7-Shift Solenoid 'A' circuit open or shorted.
8-Shift Solenoid 'B' circuit open or shorted.
9-Counter shaft or transmission speed pulse generator open or shorted.
10-Coolant Temperature Sensor open or shorted.
11-Engine RPM (Ignition coil signal) open or shorted.
12-(No code 12 used)
13-Main shaft speed pulse generator open or shorted.
14-Linear (line pressure control) solenoid open or shorted.
15-Kick down switch circuit shorted.

Dec 18, 2010 | 1993 Honda Accord

1 Answer

I have a 1992 honda accord dx, i can be in park and the D4 light is on, and the transmission will not shift properly when i put the car in gear, if the light goes out the car runs great, what do you think...


HI. This is a TCU fault. This is intermittently occurring at this time, but it will eventually get worse. You will need to have the TCU scanned for possible transmission trouble codes. I suspect that the TCU will need to be replaced or there may be an issue concerning the solenoid pack. You will need those codes to know for sure.

TCU - Transmission Control Unit

Aug 26, 2010 | 1996 Honda Accord

1 Answer

92 honda accord D4 light flashing


Flashing D4 light is an error from the TCU (transmission control unit), so you got something going on with your transmission. If you want to pull the error code, remove the passengers side kick panel and look for a pair of wires with a blue connector at the end. Stick a paper clip or some other piece of wire into each hole of the connector to short the wires. Put your key in the ignition and turn 2 clicks. The D4 light will flash the code...short flashes=1 and long flashes=10. Add the number of short and long flashes to get your code. Errors are below:

0-Transmission control unit (TCU) faulty.
1-Lock-up solenoid 'A' circuit open or shorted.
2-Lock-up solenoid 'B' circuit open or shorted.
3-Throttle Position Sensor circuit open or shorted.
4-Vehicle Speed Sensor open or shorted - No signal from speedometer.
5-Shift Lever Position Switch circuit shorted.
6-Shift Lever Position Switch circuit open.
7-Shift Solenoid 'A' circuit open or shorted.
8-Shift Solenoid 'B' circuit open or shorted.
9-Counter shaft or transmission speed pulse generator open or shorted.
10-Coolant Temperature Sensor open or shorted.
11-Engine RPM (Ignition coil signal) open or shorted.
12-(No code 12 used)
13-Main shaft speed pulse generator open or shorted.
14-Linear (line pressure control) solenoid open or shorted.
15-Kick down switch circuit shorted.

Aug 11, 2010 | 1992 Honda Accord

1 Answer

Auto transmission will not shift gears


Get diagnostics done and if you will get code P0741 - This trouble code is about damper clutch, which improves fuel economy by matching power transmission effectiveness of automatic transmission Damper clutch consists of control valve and solenoid valve which converts electric signal to hydraulic signal by the TCU signal. Corresponding code will be displayed under following conditions when damper clutch is operated form TCU lock-up output time. -when the difference between engine revolution and input shaft revolution has been below 160 RPM. Torque converter solenoid (TCU) is the last thing you should look at to replace, the cause of its failure might be in a different area like worn seals. Nevertheless it is a serious malfunction of a gearbox as further usage may end in a complete gearbox failure and the only solution you will be left with is to rebuild the gearbox or get a new one. Before you start buying parts you should closlely inspect the inner cover seals for uneven wear or possible damage, short cicuit will be caused by fluid passed onto electric connection,

Apr 29, 2010 | 2000 Kia Sephia

1 Answer

I have a 1991 accord lx. Was only functioning in


No, those sensors are seperate from transmission, should be a solenoid that is electrically controlled inside the transmission that controls the shifting.

Apr 05, 2010 | 1991 Honda Accord

1 Answer

Hello, I own a 93 toyota forerunner, 4*4, v6, automatic. Transmission was only shifting at very high rpms. Replaced trans with another out of identical vehicle, transmission will not shift, disconnected...


The transmission is controlled by the Transmission Control Unit (TCU).

Throttle position, rpm, and speed are input parameters to the TCU. The TCU has a default set of shift patterns. These shift patterns change over time based on your specific vehicle setup and driving habbits.

The shift patterns are only slightly affected by driving habbits over many driving cycles. But, changing the relationship between the throttle position and the actual speed being reported by the speed sensor can have an immediate effect on shift patterns.

While your speedo may now be correct, the realtionship between rpm and thottle position has not been corrected. That would take a gear change in the differentials.

The TCU can be reset to an inital learn base line. When this is done, the TCU will instantly learn the dynamics of your setup.

Any shop with an advanced ODB scan tool can reset the the TCU. The dealer or a transmission shop would be preferable.

You really should change your differential gears as opposed to resetting the TCU

This information was posted by ftgiles here

Jan 06, 2009 | 1993 Toyota 4Runner

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