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First Generation Legend (1986-1990) Discuss the 1st Generation Honda/Acura Legend (US 8

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Old 12-16-05, 05:43 AM   #1 (permalink)
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Throttle Body and Throttle Position Sensor

The error code on my 1988 Acura Legend indicated my Throttle Position sensor was bad. I replaced it 2 years ago from a wrecking yard. I wasn't planning on keeping the car long since I rarely use it now, So I bought another one from the yard and it is supposed to be good. Better than paying nearly $600 for a new one at the dealer. Anyway, I was looking over mine to get started and noticed a few things. A loose wire - fixed that. Then !!! the top hose on the throttle body is disconnected. I thought a simple matter of just following the curvature and finding where it goes. I can't find it! It looks like some sort of vacuum hose but I can't find it. Can anyone help? I went to the dealer and they said its too old that they don't have any info on it ! What! Anyone help please. I have a picture of what I am talking about but don't know how to post it here.
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Old 12-16-05, 02:15 PM   #2 (permalink)
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Disconnected vacuum hose could just be causing the code 7: throttle angle, go to the online manual, sticky'd; "Auto Zone - G1 Engine Diagrams" thread by sciachir, lots of useful tips and informations.

You'll find the throttle body/throttle position sensor under "Fuel System", also vacuum schematics under "Driveability & Emissions"... hope this helps and good luck
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Old 12-17-05, 02:42 AM   #3 (permalink)
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Throttle Positioning sensor

My transmission is starting to do strange things like shift down when I am trying to pick up speed, this happens periodically when I am in drive then it will just kick in and return to normal. Someone said they thought it could be the throttle positioning sensor, what are the symptoms? how do I know if that is what is wrong?
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Old 12-17-05, 03:40 AM   #4 (permalink)
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Quote:
Originally Posted by Hkolody
My transmission is starting to do strange things like shift down when I am trying to pick up speed, this happens periodically when I am in drive then it will just kick in and return to normal. Someone said they thought it could be the throttle positioning sensor, what are the symptoms? how do I know if that is what is wrong?
Your probably reffering to the throttle pressure; kind of pressure that results when engine vacuum changes. Low vacuum, due to an open throttle or heavy load, results in high throttle pressure. High throttle pressure will tell the shift valve to move into a lower gear position.

It's also possible that your auto tranny is doing this due to a kickdown valve malfunction, simply check the cable or linkage for proper adjustments, hope this help answer your question... good luck!
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Old 12-17-05, 01:38 PM   #5 (permalink)
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Transmission

Thanks alot, very usefull information, I will check that out.
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Old 12-17-05, 03:57 PM   #6 (permalink)
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Thanks for the info. I found the connection for the vacuum line. But still get the throttle pos sensor error. Is there a way to test this sensor? Is there a ohm measurement spec? Anyone know?
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Old 12-17-05, 04:12 PM   #7 (permalink)
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Quote:
Originally Posted by pnoye2
Disconnected vacuum hose could just be causing the code 7: throttle angle, go to the online manual, sticky'd; "Auto Zone - G1 Engine Diagrams" thread by sciachir, lots of useful tips and informations.

You'll find the throttle body/throttle position sensor under "Fuel System", also vacuum schematics under "Driveability & Emissions"... hope this helps and good luck
Thanks for the tip on the diagrams. I found it once but lost the link. I just tried it again. I searched for 'sciachir' and found his reference. But when I link and cut and paste to autozone, it comes back, "page not found". Do you have the link? Thanks
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Old 12-17-05, 06:40 PM   #8 (permalink)
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Quote:
Originally Posted by jmrec100
Thanks for the tip on the diagrams. I found it once but lost the link. I just tried it again. I searched for 'sciachir' and found his reference. But when I link and cut and paste to autozone, it comes back, "page not found". Do you have the link? Thanks
... okay, try this;

http://www.autozone.com/servlet/UiBr...Parameters=002
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Old 12-17-05, 07:41 PM   #9 (permalink)
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i know the 89-90 auto trans does'nt use vacuum for the t.v.
we have a cable that goes down to the transmission.....i wonder if this has ever gone out on our cars before...
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Old 12-19-05, 06:00 PM   #10 (permalink)
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Thanks for the link. Found it.
Anyone know what the resistance readings should be on a throttle angle sensor. I am assuming I can put meter leads across the connections and read a resistance?
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Old 12-19-05, 10:09 PM   #11 (permalink)
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The throttle angle sensor is mounted on and driven by the throttle body unit. The sensor
is a variable resistor (potentiometer) that is used by the ECU to detect throttle movement
and position. A 5 volt reference signal is applied from ECU pin C13 and a ground signal
on pin C14. When the throttle is opened the sensor resistance changes which is read as a
varying voltage signal at pin C7. At idle position the sensor voltage is approx. 0.5V and

approx. 4.5 V at full throttle.







Code 7 indicates a malfunction in the throttle angle sensor or sensor circuit.

NOTE: This test requires the use of Acura sensor test harness part no.
07GMJ-ML80100 or equivalent. Wire colors referenced in testing procedures refer to
test harness coloring and not the actual harness wire color.

1. Remove Alternator Sense fuse in underhood relay box for 10 seconds to reset
ECU.
2. Start engine and observe diagnostic LED.

Flashes code 7 , proceed to step 4.
Does not flash , proceed to next step.

3. Malfunction is intermittent. Check connections between ECU and throttle angle
sensor. End of test.
4. Turn ignition off.

Image Throttle Angle Sensor Diagnosis



5. Connect sensor test harness between throttle angle sensor and harness
connector.
6. Turn ignition on and check voltage between RED and GRN test harness
terminals.

Approx. 5 volts , proceed to step 13.
Not approx. 5 volts , proceed to next step.

7. Measure voltage between RED terminal and ground.

Approx. 5 volts , proceed to next step.
Not approx. 5 volts , proceed to step 9.

8. Repair open in GRN/WHT wire between throttle angle sensor and ECU terminal
C14. End of test.
9. Turn ignition off.
10. Install test harness between ECU and harness connector. If test harness is not
available, carefully backprobe wires at ECU connector.

Image Throttle Angle Sensor Code 7 Diagnosis


11. Turn ignition on.
12. Check for voltage between ECU terminals C13 and C14.

Approx. 5 volts , proceed to next step.
Not approx. 5 volts , replace electronic control unit. End of test.
13. Measure voltage between GRN and WHT wires with throttle full open.

Approx. 4 volts , proceed to step 15.

Not approx. 4 volts , proceed to next step.

14. Check for short in RED/YEL wire between ECU terminal C7 and throttle angle
sensor. If wire checks OK, replace throttle angle sensor. End of test.
15. Turn ignition off.
16. Install test harness between ECU and harness connector. If test harness is not
available, carefully backprobe wires at ECU connector.
17. Turn ignition on.

Image Electronic Control Unit Pin And Connector Identification


18. Check voltage between ECU terminals C7 and C14.

Approx. 4 volts , replace electronic control unit. End of test.
Not approx. 4 volts , proceed to next step.

19. Repair open RED/YEL wire between ECU terminal C7 and throttle angle sensor.
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Old 12-21-05, 01:52 AM   #12 (permalink)
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Great info. Thank you. I remember reading somewhere but couldn't remember. Thanks for the post. One more question, can I make that harness? I have connectors, wires, etc.... but need a guide as to what the harness looks like. Any help here?
Thanks again.
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Old 12-22-05, 09:51 PM   #13 (permalink)
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Thanks jmm67 . I checked around to get the harness, but the response is that they don't have it? Do you know where to get the test harness? Or what does it look like? Can I make it from an old harness from an Acura from a salvage yard?
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Old 12-22-05, 10:34 PM   #14 (permalink)
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Pm me your email address and I will send you all I have on the throttle position sensor.
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Old 12-28-05, 03:11 PM   #15 (permalink)
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Are the wire colors on the Test harness the same as on the connectors. I can't find a test harness anywhere. The dealers have no idea what Im talking about. I can make my own if I find the right mating connectors. I think I can back probe the ECU? Any suggestions?
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