1990 Honda Accord

Tiny
HONDAGUY90EX
  • MEMBER
  • 1990 HONDA ACCORD
Engine Performance problem
1990 Honda Accord 4 cyl Front Wheel Drive Automatic

the 1990 accords have 3 sensors inside the distributer I replaced my distributer and it fixed my problems (not reving past 3.5k rpms, excessive fuel consumption) but only lasted 3 days so I replaced it again and it only lasted 1 week what could be making these sensors go out because the car still runs good but it will not rev past 3.5k rpms and burns exessive fuel?
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Saturday, October 25th, 2008 AT 5:21 PM

20 Replies

Tiny
KHLOW2008
  • EXPERT
Hi HONDAGUY90EX,

Is the Check Engine Lamp showing and what is the code?
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Monday, October 27th, 2008 AT 12:51 PM
Tiny
HONDAGUY90EX
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The check engine light is on but I dont know how to find the out the code b/c I cant find the diagnostic connecter behind the passenger side kick panel almost as if it were gone any suggestions?
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Wednesday, October 29th, 2008 AT 5:47 PM
Tiny
KHLOW2008
  • EXPERT
Hi HONDAGUY90EX,

Lift up the carpet and check if the connector is tape to the wire harness near the kick panel. Should be a blue color 2 pin connector.
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Thursday, October 30th, 2008 AT 6:28 AM
Tiny
HONDAGUY90EX
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Thanks alot dude I found the connector this afternoon and it gave me 2 codes #31).#41 is to my o2 sensor heater #31 is to my tranny but my manuel tells me to take it too a shop. What does code #31 mean?
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Thursday, October 30th, 2008 AT 5:46 PM
Tiny
KHLOW2008
  • EXPERT
Hi HONDAGUY90EX,

CODE 31 - A/T FI SIGNAL B
1. Turn ignition off. Reset ECU by removing BACK-UP fuse in under-hood relay box for 10 seconds. Road test vehicle. Drive several miles so that transmission upshifts and downshifts several times. Verify if CHECK ENGINE light is on and if LED is flashing Code 31. If LED is flashing Code 31, go to next step. If LED is not flashing Code 31, problem is intermittent, system is okay at this time.
2. Turn ignition off. Connect ECU Test Harness between ECU and ECU connector. See Fig. 7 . Disconnect 22-wire connector from A/T control unit. Check for continuity between ECU terminal B4 and ground.
3. If continuity exists. repair short in Green wire between ECU terminal B4 and A/T control unit. If continuity did not exist. check for continuity on White/Red wire between ECU terminal B4 and A/T control unit connector.
4. If continuity does not exist, repair open in Green wire between ECU terminal B4 and A/T control unit. If continuity did exist, substitute a known good ECU. If condition is corrected, replace original ECU.


http://www.2carpros.com/forum/automotive_pictures/192750_ECUTest90Accord01_1.jpg

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Friday, October 31st, 2008 AT 9:46 AM
Tiny
HONDAGUY90EX
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Where can I find an ecu test harness?Why do I need one could this be my problem?(Not reving past 3500 rpms exessive fuel consumption)What do I do to fix code #41?
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Friday, October 31st, 2008 AT 12:59 PM
Tiny
KHLOW2008
  • EXPERT
Hi HONDAGUY90EX,

The test harness is a special tool used for testing the ECU and its wiring. It is not necessary to have one.

I normally used a fine tipped test lamp and probe the ECU wire harness directly but care must be taken to avoid damaging the harness terminals.
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Friday, October 31st, 2008 AT 1:51 PM
Tiny
HONDAGUY90EX
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How do I fix code #31?
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Saturday, November 1st, 2008 AT 1:48 AM
Tiny
KHLOW2008
  • EXPERT
Hi HONDAGUY90EX,

The explanation in my 3rd reply shows you how to diagnose and rectify the problem.
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Saturday, November 1st, 2008 AT 10:42 AM
Tiny
HONDAGUY90EX
  • MEMBER
Sorry about that I meant code #41 oxygen sensor heater is what my haynes manuel says it is also the S light on my dash blinks aswell when I perform the diagnostic test what does that mean?
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Saturday, November 1st, 2008 AT 1:51 PM
Tiny
KHLOW2008
  • EXPERT
Hi HONDAGUY90EX.

When the S light blinks, it means an error has been detected by the transmission control module. Count the flashes and let me know.

DTC # 41 = HO2S sensor, a faoult in the sensor or circuit.
Most probably you need to replace it.
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Saturday, November 1st, 2008 AT 2:09 PM
Tiny
HONDAGUY90EX
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Cool be right back
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Saturday, November 1st, 2008 AT 2:14 PM
Tiny
HONDAGUY90EX
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It flashes once real fast and dimm and then once more a little slower and brighter. Do you know what code this is?For DTC#41 do I replace the sensor or circuit?
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Saturday, November 1st, 2008 AT 3:14 PM
Tiny
KHLOW2008
  • EXPERT
If the S light flashes 1 fast and ! Slow it means thers are 2 error codes.

DTC # 1 possible causes
1. Disconnected lock-up control solenoid valve A connector.
2. Short or open in lock-up control solenoid valve A wire.
3. Faulty lock-up control solenoid valve A.

DTC # 10 possible causes.
1. Disconnected water temperature sensor connector.
2. Short or open in water temperature sensor wire.
3. Faultry water temperature sensor.

Both symptoms causes the lock-up clutch not to engage. Idle speed is alos unstable if it is DTC # 1.
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Saturday, November 1st, 2008 AT 3:44 PM
Tiny
HONDAGUY90EX
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How do I determine the code?
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Saturday, November 1st, 2008 AT 9:16 PM
Tiny
KHLOW2008
  • EXPERT
Hi,

The codes would be recycling and wait for the prolonged pause before you start counting. If it starts with a prolonged flash, count it as 10 and then the short pause with successive flashes are the intergers.

Prolonged flashes are the DTC separator.
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Saturday, November 1st, 2008 AT 11:10 PM
Tiny
HONDAGUY90EX
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I still cant find out what is causing my motor not to rev past 3.5k rpms. Is there anybody who knows?
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Tuesday, November 11th, 2008 AT 2:17 PM
Tiny
KHLOW2008
  • EXPERT
Hi HONDAGUY90EX,

Have you resolved the DTC codes yet?

Possible causes for engine not able to rev pass 3,500 rpm.
1. Bad distributor.
2. Throttle Position Sensor bad or out of adjustment.
3. Faulty ECM.
4. Clogged/restricted exhaust passages.
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Tuesday, November 11th, 2008 AT 5:59 PM
Tiny
HONDAGUY90EX
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How do I determine if my ECM or my TPS is bad?No I still have not resolved my DTC codes yet but I will soon.I want to figure out everything I need to fix it with out spending any unnecacery money.
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Wednesday, November 12th, 2008 AT 5:59 PM
Tiny
KHLOW2008
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When there are any DTC, you need to resolve them first. When they are resolved, other problems might go a way.
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Thursday, November 13th, 2008 AT 7:08 AM

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