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Old 09-06-2006, 04:13 PM   #31
93delsolzz
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Re: '93 Del sol will not start at all now

Hi,
You mentioned the heater circuit is the black and yellow/black. Check for 12v when the car is on but not running.

Do I disconnect the o2 Sensor plug to check for 12v or probe the back of the connector while connected to the o2 sensor and check for 12v?

Also doesn't there need to be resistence between terminals C & D (2 of the 4 wires) on the HO2S? (I got from a Chilton manual)

Thanks again.
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Old 09-06-2006, 05:20 PM   #32
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Re: '93 Del sol will not start at all now

Yeah, 10-40 ohms between C and D. Both checked with the O2 sensor installed. The Chilton's doesn't specify that?
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Old 09-08-2006, 02:02 AM   #33
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Re: '93 Del sol will not start at all now

Hi,
The Chilton's says:
With key OFF.
Disconnect the 4P connector from the HO2S.
Measure resistance between terminals C & D on the HO2S.
Is there 10-40 ohms?

I did all that and did not get any reading at all as if there was no continuity.

From there Chilton's says if the is not 10-40 ohms replace o2s.

At that point it stops. If there was 10-40 ohms then it continues on.

I did check the heater circuit: the orn/black (the book said orn/black) and yellow/black wire, check for 12v.

And there was 12v, this was with the connector disconected. It doesn't say to disconect it or not but a nearby drawing shows it disconected, so thats how I did it.

This voltage test was assuming there was 10-40 ohms on the previous test.

Thanks again for your input.

Aloha!
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Old 09-08-2006, 03:56 PM   #34
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Re: '93 Del sol will not start at all now

Ok, if the sensor checks out ok and you're still getting the code, check the wiring from the ECU, through the firewall, and down to the O2. There might be a short somewhere.
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Old 09-09-2006, 02:43 PM   #35
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Re: '93 Del sol will not start at all now

Hi,
The first test in the Chilton's, it says if the is not 10-40 ohms between terminals C & D on the HO2S, replace o2s.

I'm assuming that that ment it was bad (the o2 sensor).?

Thanks again for your help.

Aloha!

Last edited by 93delsolzz; 09-09-2006 at 05:12 PM.
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Old 09-10-2006, 01:42 PM   #36
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Re: '93 Del sol will not start at all now

Yup, replace the sensor. Have fun getting it out. My recomendation is to heat it up at the base with a propane torch and then try to break it lose.
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Old 09-24-2006, 07:15 PM   #37
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Re: '93 Del sol will not start at all now

Hi,
I got the new 02 sensor in (and you were right that was a bit@! to get out even with the heat it stripted a bit, I tapped the threads to clean it up) and it runs great now.

I also noticed the car has an increase in power from the MSD Coil. Nice addition.

The computer now has no codes.

Thanks a lot for all your help.

Aloha!
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Old 09-24-2006, 09:51 PM   #38
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Re: '93 Del sol will not start at all now

Excellent! Glad it all worked out for you.
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Old 09-22-2009, 12:34 PM   #39
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Re: '93 Del sol will not start at all now

Quote:
Originally Posted by 93delsolzz View Post
Today I was going over a few more checks.

I checked the main relay, and all the checks were ok.

I pulled a plug again checking for spark. Still no spark but I did not smell any fuel this time after cranking for some time. The first time I checked (the day after I drove it home) I could smell fuel when I pulled a plug.

After realizing I may have more then one problem. I then wanted to check the fuel pump. I turned ignition on and I hear nothing coming from the fuel pump. Then I checked to see if I was getting voltage with ignition on to the fuel pump. And NO, I was not getting any voltage. I did have a good ground from - wire to body ground. I then checked the + wire from the fuel pump to the main relay, wire was ok; had continuity, but when I checked it for voltage, I had NO voltage. I then checked the wire to the #1 slot on the main relay for voltage. It did have voltage. I can hear and feel the main relay operating when I turn the key to the on position.

This is how I checked the main relay.
Main Relay Test:
NOTE: If the car starts and continues to run, the main relay is okay.
  1. Remove the main relay.
  2. Attach the battery positive terminal to the No. 4 terminal and the battery negative terminal to the No. 8 terminal of the main relay. Then check for continuity between the No. 5 terminal and No. 7 terminal of the main relay.
    • If there is continuity, go on to step 3.
    • If there is no continuity, replace the relay and retest.
  3. Attach the battery positive terminal to the No. 5 terminal and the battery negative terminal to the No. 2 terminal of the main relay. Then check that there is continuity between the No. 1 terminal and No. 3 terminal of the main relay.
    • If there is continuity, go on to step 4.
    • If there is no continuity, replace the relay and retest.
  4. Attach the battery positive terminal to the No. 3 terminal and battery negative terminal to the No. 8 terminal of the main relay. Then check that there is continuity between the No. 5 terminal and No. 7 terminal of the main relay.
    • If there is continuity, the relay is OK; If the fuel pump still does not work, go to Harness Test.
    • If there is no continuity, replace the relay and retest.
The only differance I did is, since my car didn't have the No. 4 terminal, but my car had a No. 6 terminal, I tested it by substituting the No. 4 terminal with my No. 6 terminal.

Not sure why mine is different.

I forgot to put the main relay back in before I cranked the car over, funny thing is that it cranked over (of course it didn't start). The starter must be on its own circut.

Is there a way to better test the main relay, and also test the ECU?

Thanks again for your willingness to help.

Aloha!


Hi ... what about if i don't have negative in terminal #8 .... a put negative on #8 and fuel pump start to work , but car doesnt start .... when start (some days after try a lot of times) run all day very good .. then next day the same problem , car doesn't start.
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