 Measuring Continuity....??? |
 Sep 13, 2013 - 4:14 PM
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Enthusiast  Joined Oct 25, '12 From Pennsylvania Currently Offline Reputation: 0 (0%)  |
Okay.... I recently tested a relay for continuity, and two terminals caused my meter to beep, and the other two terminals caused my meter to read .064 without beeping. I came across a car forum question, in which the poster was using a 4 pin toyota relay on his hot rod, and was testing continuity. This was the same normally closed relay I was testing, and he got the same results. One person said the .064 was continuity for Toyota relays. I'm not an electronics wizard, so if anyone has any knowledge here, that'd be great. I broke a relay case yesterday tugging it out, and picked up a new relay this morning. It's supposed to have continuity across two pins and no continuity across the other two (fan relay no. 2) without power. Both the new and old relay read .061 ohms across the pins that are supposed to have continuity, so I'm guessing that's continuity without the beep.
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Sep 14, 2013 - 9:17 AM
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Enthusiast Joined Oct 25, '12 From Pennsylvania Currently Offline Reputation: 0 (0%) |
Hi Edy,
With the engine ice cold, I followed your procedure. Engine off key on, the fans were running. Pulled the relay, and they continued running. Tested 85 and 86, no voltage. This is a normally closed relay, and when I tested it with power off the car, the switch did open (no continuity between 37 and 80). The EFI is buried deeper than the Fan relay, and I stopped after giving it a tug. It's like Toyota doesn't want to make removing relays easy.... or I need a tool to pull relays. I did order another fan relay from the dealer, but that's going to cost $85 to test. Junkyards are nonexistent where I live. I did test the resistance of the ECT sensor. Yesterday was in the 70's, and a cold reading was 1.92 kOhms. This morning was 57 degrees, and I got 3.2 kOhms. Seems like a big difference for less than 20 degrees ambient temperature. The harness is sending 5 volts, so....? I measured the sensor last week, and the resistance dropped considerably once the engine warmed. P.S. I looked for any signs of the fans being wired to the ignition, but couldn't find anything. It looks 100% factory. This post has been edited by FrankB2: Sep 14, 2013 - 9:21 AM |
Posts in this topic
FrankB2 Measuring Continuity....??? Sep 13, 2013 - 4:14 PM
Special_Edy Just swap the relay with your starter or efi relay... Sep 13, 2013 - 4:34 PM FrankB2 Hi Edy,
I saw your post with this advice (Thanks... Sep 13, 2013 - 6:09 PM Special_Edy Okay so terminal 86 is the input, terminals 85 is ... Sep 13, 2013 - 7:54 PM FrankB2 Thinking...... this is a normally closed relay... Sep 14, 2013 - 10:43 AM Bitter Usually when I see a toyota with the fans on all t... Sep 14, 2013 - 10:47 AM Special_Edy No the relays are naturally open circuited, with n... Sep 14, 2013 - 11:16 AM FrankB2 Hi Edy,
I'm using this BGB schematic: http://b... Sep 14, 2013 - 12:34 PM FrankB2 Went to Toyota, and niece's boyfriend used a s... Sep 14, 2013 - 7:11 PM Bitter 1997 GT Convertible diagram. 3 switches that feed ... Sep 15, 2013 - 9:11 AM FrankB2 Excellent! From the looks of that schematic, t... Sep 15, 2013 - 9:42 AM
Bitter I'd look at the thermo switches and pressure s... Sep 15, 2013 - 12:04 PM |
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