Fuel Pump Circuit Opening Relay Testing - YotaTech Forums

86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Fuel Pump Circuit Opening Relay Testing

LinkBack Thread Tools Search this Thread
Old 04-23-2008, 07:08 PM   #1
Registered User
Thread Starter
Toyotero's Avatar
Join Date: Nov 2007
Location: Austin, TX
Posts: 100
Fuel Pump Circuit Opening Relay Testing

Vehicle = 1986 4Runner Auto Transmission.

Thanks to the '85 4Runner FSM and more thanks to 4Crawler ,I have been able to determine that I might have a weak Fuel Pump Circuit Opening Relay like he had... There is no power at the fuel pump when I crank it, but there is 12 V when I jumper the Fuel Pump Check Connector (...or maybe I have a bad fuel pump switch in the Air Flow Meter?)

How do you test the Circuit Opening Relay? There are 5 contacts! not labeled at all on the relay body.
Circuit Opening Relay Contacts
Circuit Opening Relay Back

How to you test the Fuel Pump Switch in the Air Flow Meter?

and what is ECU STA?

Thanks in advance,


I should have spent more time with the FSM and less time in the YotaTech galleries...

Last edited by Toyotero; 04-23-2008 at 07:45 PM.
Toyotero is offline   Reply With Quote
Old 04-23-2008, 11:09 PM   #2
Registered User
thook's Avatar
Join Date: Sep 2005
Location: NW Ark on wooded ten acres...Ozarks at large!
Posts: 8,562
Well, it looks like you answered one of your questions. I was going to say look in the FSM or 4crawler's site for testing the air flow meter. One of the circuits tested in the procedure is for the FP switch. I forget offhand which one. If it passes, no need to test the COR as you've just narrowed the problem down to it....considering the FP is working when you jump the connector.
thook is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
1985 22r pickup, no spark but engine cranks sandyota 84-85 Trucks & 4Runners 12 04-30-2017 06:37 PM
*SOLD* 1991 Toyota Pickup DLX 4x4 5 speed 165k, fresh motor,lifted,clean! $6150 GreatLakesGuy The Classifieds GraveYard 8 09-04-2015 09:27 AM
'86 Turbo Fuel Pump Replacement Question TURBOrunnerNM 86-95 Trucks & 4Runners 4 07-22-2015 11:01 AM
Gas gauge not working Tyler Cunningham 86-95 Trucks & 4Runners 3 07-11-2015 10:18 AM
2000 camry wont start Huntingtruckcletus Other Makes Cars/Trucks 0 07-08-2015 05:26 PM

05, 1986, 2004, 22re, 4runner, circuit, fuel, mgt, open, opening, pump, relay, schematic, supra, testing, toyota

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -8. The time now is 09:10 PM.

2017 InternetBrands, Inc.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: