1991 Acura Integra ATCU code 9

Hi mr.brashear,

Here are the diagnostic procedures.

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:

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.

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.

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?

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.

The light at the end of the tunnel is in sight. We should be done and over with this problem soon.

Cheers.

You're welcomr.

Too bad about a new problem.

Have nice day.

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.