Question about 1990 Acura Legend

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I have a 1990 Acura Legend L 4Door. My service engine light is on, giving me a fault code of 18. I am told it is the Ignition Timing Adjuster, but I am having trouble actually finding this part. I need some help in finding this part for my car. Thanks

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  • bornarebel May 18, 2009

    Thnak you for your answer, but I already know where the part is located on the car. What I need is to know where I can find the part to purchase it and replace the possible faulty one on my car. I am sorry for the confusion. Since the car is a 1990 model this part is no longer manufactured. Where can I purchase this part?




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Here are 2 links, one is for the location of the ignition timing adjuster, the other, a diagram on how to adjust the ignition timing. I hope this helps with your problem. All the best!

Posted on May 18, 2009


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1 Answer

Acura legend problems

my book does not show a code 18 problem but it refers to knock sensor fault front as high voltage . Replace the knock sensor
knock sensor are used to tell the CPU to alter the fuel air ratio and the ignition timing to suit rpm's and load . If it is out then the code 18 may be the result .

Jan 02, 2014 | Cars & Trucks

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I need a honda car code , i can't turn on my radio

service manual.
Code Description Possible Cause
0 ECU / ECU signal No signal to ECU
1 Oxygen sensor circuit Oxygen sensor or circuit, ECU
2 Oxygen sensor circuit Oxygen sensor or circuit, ECU
3 MAP sensor circuit Map sensor circuit
4 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
5 MAP sensor circuit MAP sensor or circuit, mechanical
6 ECT sensor circuit ECT sensor or circuit, automatic
transaxle control unit
7 TPS / Angle Sensor TPS sensor or circuit, automatic
transaxle control unit
8 CKP sensor / engine speed (RPM) Crank angle sensor or circuit, ECU
9 CMP sensor CMP sensor or circuit
10 IAT sensor IAT sensor or circuit
11 Idle Mixture Adjuster Sensor Idle mixture adjuster sensor or
12 EGR system fault No EGR action, faulty EGR valve
13 BARO sensor circuit BARO sensor or circuit
14 Idle Air Control valve circuit / ECU Open or shorted out ignition signal
circuit / No signal to ECU
15 Ignition Output signal Open or shorted ignition output
signal circuit
16 Fuel Injector Circuit Open or shorted fuel injector
17 VSS circuit VSS sensor or circuit
18 Ignition Timing Adjuster Open or shorted signal circuit
19 A/T Lock-up control solenoid Open or shorted signal circuit,
Lock-up control solenoid lock-up solenoid
20 Electrical Load Detector / Sensor Electrical load detector or circuit
Fault Code Definitions (21 - 59)
Chapter 3 22
Code Description Possible Cause
21 Spool Solenoid Valve Open or shorted signal circuit,
spool solenoid valve
22 Valve Timing Electronic Oil Open or shorted signal circuit,
pressure switch valve timing oil pressure switch
23 Knock sensor circuit Knock sensor or circuit
30 AT / ECU communication signal A AT control unit, ECU
31 AT / ECU communication signal B AT control unit, ECU
35 Traction control / ECU / signal Traction control module, ECU
36 Traction control / ECU / signal Traction control module, ECU
41 Oxygen sensor heater - left side Oxygen sensor / heater or circuit
42 Oxygen sensor heater - right side Oxygen sensor / heater or circuit
43 Fuel Supply system - left side Oxygen sensor or circuit, fuel
44 Fuel Supply system - right side Oxygen sensor or circuit, fuel
45 Fuel metering - left side Injector control circuit, incorrect
fuel metering
46 Fuel metering - right side Injector control circuit, incorrect
fuel metering
48 Heated oxygen sensor Oxygen sensor or circuit
53 Right Knock Sensor Right knock sensor or circuit
54 CKP sensor 2 CKP sensor 2 or circuit
59 CMP sensor 2 CMP sensor 2 or circuit

Dec 28, 2010 | 1994 Honda Accord

1 Answer

Is there an ALDL port on a legend plug in a scan tool

There is a connector but it is not like the connector used in the newer 1996 OBD2 cars, your year uses OBD1, here is how you check for codes in this car.

Acura OBD1 Codes Retrieval
Acura vehicles 1986-95 obd1 code retrieval
There are a few different ways to retrieve the codes for "check engine light" for Acura vehicles. One method is to use a led light (sometimes 2 led lights) on the computer or controller box itself. If it has 2 led lights, the color is red and amber. The red is used for flashing the codes whereas the amber is used for adjustment. If you have only a single led light indicator, then that is used for flashing the code.
The controller box can be found by lifting the carpet of the passenger side front foot well or floorboard. You can see the led lights without removing the controller. On other models, you can find the controller under the driver or passenger front seat.
The second way to get the code is using a jumper wire on the diagnostic connector located on the kick panel at the front passenger side. You then watch the codes being flashed at the dash panel after you turn the key on. To read the code being flashed is easy. Example: Code 23 is 2 long flashes followed by 3 short flashes. A longer pause separates the next code that follows.
Here are Acura vehicles 1986-95 general codes:
Code 0 Electronic control unit (ecu)
Code 1 02 (oxygen) sensor
Code 3 and 5 map sensor
Code 4 Crank angle sensor
Code 6 Coolant temperature sensor
Code 7 Throttle angle sensor
Code 8 Crank angle sensor (TDC)
Code 9 Crank angle sensor (CLY)
Code 10 Intake air temperature sensor
Code 12 EGR system fault
Code 13 Atmospheric pressure sensor
Code 14 Electronic air control valve
Code 15 Ignition output signal
Code 16 Fuel injector fault
Code 17 Vehicle speed sensor
Code 21 Spool solenoid valve
Code 22 Valve timing oil pressure switch fault
Code 23 Knock sensor
Code 41 Oxygen sensor heater fault
Code 43 Fuel supply system

Nov 30, 2010 | 1990 Acura Legend

1 Answer

How do i set my distributor advance for 2.5liter, 1987 acura? I can't seem to find a good balance, i get either no low end power or no high end power

15 degrees BTDC according to

  1. Start engine and allow it to warm up until the cooling fan comes on.
  2. Connect a timing light to engine; while engine idles, point light toward pointer on timing belt cover.
  3. Inspect ignition timing at idle. Timing should be 15plus or minus2 degrees BTDC, using the RED timing mark, at 680plus or minus50 rpm in N .
    1. If timing adjustment is necessary, complete following:
    1. Remove control box upper cover and ignition timing adjuster from control box.
    2. Drill 2 rivets off with a 1 / 8 in. drill bit, then separate stay cover from adjuster.

  • Oct 29, 2010 | 1987 Acura Legend

    1 Answer

    The check engine light comes on at high speed on my 1990 acura legend but turns off after i restart the car it has 150000 and runs great

    Check the code by looking at the blinks of the computer under the passenger seat with the key on. To clear the codes take the ALT.SENSE fuse (7.5 A) out of the box to the rear of the battery. I have had the front O2 sensor go out and the light would go on when I was going over a mountain pass.

    May 14, 2010 | 1990 Acura Legend

    1 Answer

    1994 Acura Legend check engine light is on. When

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    1 Answer

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    2 Answers

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    Mar 03, 2009 | 1990 Acura Legend

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