1991 Acura Integra ATCU code 9

Tiny
MR.BRASHEAR
  • 1991 ACURA INTEGRA

Transmission problem
1991 Acura Integra 4 cyl Front Wheel Drive Automatic 189551 miles

i just bought a car that had been sitting for three years. The s3 light blinks on the shifter and I read the code for the tranny and it blinked 9 times over and over. I heard it was a speed pulser but I cant find out anything about it, wondering if you could help

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Monday, September 20th, 2010 AT 9:11 PM

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Tiny
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Hi mr.brashear,

Here are the diagnostic procedures.


http://www.2carpros.com/forum/automotive_pictures/192750_Code9Trans91IntegraFig21_1.jpg



http://www.2carpros.com/forum/automotive_pictures/192750_Code9Trans91IntegraFig21a_1.jpg



SPEED PULSER
Apply parking brake. Raise and support vehicle so front wheels are free to rotate. Disconnect electrical connector at speed pulser. Speed pulser is mounted on transaxle. See Fig. 32 .

2. Connect ohmmeter between speed pulser connector terminals. Perform STEP 1. See Fig. 32 . Rotate front wheels, and ensure circuit makes and breaks continuity.

3. If circuit makes and breaks continuity, speed pulser is okay. If not, remove speed pulser from transaxle.

4. Connect ohmmeter between speed pulser connector terminals. Move magnet close to speed pulser, and check if continuity exists. Perform STEP 2. See Fig. 32 . DO NOT allow magnet to be positioned close to ohmmeter.

5. Continuity should exist when magnet is close to speed pulser. Continuity should not exist when magnet is moved away from pulser.

6. Replace speed pulser if continuity is not as specified. If continuity is correct, speed pulser rotor in transaxle must be checked. Speed pulser rotor is located on 2nd accumulator body, in transaxle:


http://www.2carpros.com/forum/automotive_pictures/192750_SpeedPulser91IntegraFig32_1.jpg


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Tuesday, September 21st, 2010 AT 9:49 AM
Tiny
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This was by far the most helpfull piece of info I have gotten in two months of searching on the web. Thank you very much I will borrow an ohm meter from work and try this next week thanks again.

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Friday, September 24th, 2010 AT 8:26 PM
Tiny
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You're welcome and if you require any additional information, just post reply and I will get back to you once notification is received.

Thank you for the feedback.

Have a nice day.

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Saturday, September 25th, 2010 AT 6:10 AM
Tiny
MR.BRASHEAR
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That was great advice my friend, I got underneath the car and looked around the tranny and I saw something that looked like the object in the picture and sure enough it was unplugged. So I plugged it back in and no more tcu code, but the car still doesnt want to shift till like 5000 rpms and sometimes it goes into third then right back to second, but no s3 light. The only code I get is 7 on the ecu and the ABS light turns on and ideas?

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Wednesday, September 29th, 2010 AT 12:47 AM
Tiny
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Check the ABS Control module for the trouble code.

Code 7 = Throttle Position Sensor. Any fault with the TPS would cause erratic shifting.

CODE 7: THROTTLE ANGLE SENSOR

1. Turn ignition off. Remove HAZARD fuse at battery positive terminal for 10 seconds to reset ECU. Start engine. Verify if CHECK ENGINE and LED lights are on and if LED indicates Code 7. If light indicates Code 7, go to next step. If light does not indicate Code 7, problem is intermittent. Check for poor or loose connections at throttle angle sensor, connector C216 at right shock tower and connector C318 at left shock tower. Test drive, and check again.

2. If light is on, turn ignition off. Disconnect 3-wire connector from throttle angle sensor. Turn ignition on. Measure voltage between Yellow/White (positive) and Green (negative) wire terminals. If about 5 volts are not present, go to step 5). If voltage is about 5 volts, turn ignition off. Reconnect sensor connector. Connect ECU test harness between ECU and ECU connector.

3. Turn ignition on. Measure voltage between ECU terminals C7 (positive) and C12 (negative). See Fig. 1 . Voltage should read .3 volt at closed throttle and about 4.5 volts at wide open throttle. Transition between lower and upper voltage specifications as throttle is depressed should be smooth.

4. On A/T models, if sensor voltages are not correct, disconnect 18-pin connector from A/T control unit. Recheck voltages. If voltages are correct, replace A/T control unit. On all models, if voltages are not correct, replace throttle angle sensor or repair open or short in Red/Blue wire between ECU terminal C7, A/T control unit (if equipped) and throttle sensor.

5. If voltage reading between Yellow/White (positive) and Green (negative) wire terminals in step 2) was not about 5 volts, measure voltage between Yellow/White (positive) wire terminal and ground.

6. If about 5 volts are present, repair open in Green wire between ECU terminal C12 and throttle angle sensor. If about 5 volts are not present, turn ignition off. Connect ECU test harness between ECU and ECU connector. Turn ignition on.

7. Measure voltage between ECU terminals C13 (positive) and C12 (negative). If about 5 volts are present, repair open in Yellow/White wire terminal between ECU terminal C13 and throttle angle sensor. If about 5 volts are not present, substitute a known good ECU. If condition goes away, replace ECU.


http://www.2carpros.com/forum/automotive_pictures/192750_ECUTerminal91IntegraFig01_1.jpg



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Wednesday, September 29th, 2010 AT 9:44 AM
Tiny
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Well I tested the tps wires and they read 4.8 volts. Then I got to thinking since the car leaked water inside and there was a huge puddle on the floor (because I live in the northwest) when I bought the car, and the ecu is on the floor right there I think maybe the ecu is toast. I took out the connections and cleaned them with electical cleaner but the problems still exsist. It idels high and back fires sometimes, and does not want to shift into 2nd untill 5000 rpms or if I manually put it in 2nd gear, and its an automatic by the way. Do you think my ecu is toast or what?

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Saturday, October 23rd, 2010 AT 2:15 PM
Tiny
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The TPS has 2 circuits. One has aproximately 5 volts. You read 4.8 volts so is good.

The other circuit would have 0.5 volts at fully closed throttle and would increase in linear proportions till about 4.5 volts at fully opened throttle.

Did you perform the test for TPS as outlined?

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Sunday, October 24th, 2010 AT 12:18 AM
Tiny
MR.BRASHEAR
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I do not have a test harness for my ecu, I was wondering if I can test c7 and c12 while the original harness is still plugged in.

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Sunday, October 24th, 2010 AT 8:55 AM
Tiny
MR.BRASHEAR
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Well I tested what I thought was the c7 terminal and a good ground cuz I couldnt find the c12 terminal, and I got.60 volts.

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Sunday, October 24th, 2010 AT 9:11 PM
Tiny
MR.BRASHEAR
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I had a buddy come over and help me and in wide open throttle I got 2.51 volts on my multimeter. I know it was suppossed to be 4.5 any more ideas thanks again

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Sunday, October 24th, 2010 AT 10:41 PM
Tiny
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At fully closed it should be 0.5 V and fully open 4.5 V.

The TPS could be installed wrongly. Remove the TPS and check the installed position, the slot of the TPS should be seated onto the key of the throttle plate tab.

The check harness is to facilitate easier testing and you can back probe the ECU terminals. Remember the position of the harness is correct as shown if you look at it from behind, at the wire side.

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Monday, October 25th, 2010 AT 7:23 AM
Tiny
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Man you do know your cars I checked the TPS and the little plastic piece in the middle was broken off. So I went on ebay and found a new one, I looked at the picture and the one that came off of my car was different looking on the inside, I think I bought the wrong one last time. So I bought the new TPS and I will tell you how it goes thanks again man

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Tuesday, October 26th, 2010 AT 12:53 AM
Tiny
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The light at the end of the tunnel is in sight. We should be done and over with this problem soon.

Cheers.

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Tuesday, October 26th, 2010 AT 7:52 AM
Tiny
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Well sorrry I havent answered but your idea worked and my car shifted fine and drove alot better but was kinda sputtering around and soon found out I had a blow head gasket but thanks for your help you do know your stuff man.

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Wednesday, June 29th, 2011 AT 7:01 AM
Tiny
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You're welcomr.

Too bad about a new problem.

Have nice day.

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Wednesday, June 29th, 2011 AT 11:35 AM
Tiny
MR.BRASHEAR
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Yeah I just went and traded that car for two guns haha. Now I have a 1991 legacy awd that runs very good but the cruise control and speedometer do not work do u have any idea as to y and how I could fix it.

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Wednesday, June 29th, 2011 AT 6:51 PM
Tiny
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When the speeedometer does not work, the cruse control fails as well.

The most likely cause would be a faulty vehicle speed sensor. I believe you have posted a question on it nd another of our expert had answered you.

Let me know how it goes.

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Wednesday, June 29th, 2011 AT 10:10 PM
Tiny
MR.BRASHEAR
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Ill let you know man thanks

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Wednesday, June 29th, 2011 AT 10:27 PM

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