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

Should Cold Start Injector always receive signal?

Old 09-28-2016, 06:15 AM
  #1  
Registered User
Thread Starter
 
Join Date: Sep 2016
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Should Cold Start Injector always receive signal?

Newbie here.....Hello everyone, I am trying to work on an issue with my a 1986 22re. When the cold start injector is unplugged truck runs fine when I plug the cold start injector in the truck stalls. With the engine running I checked the connector going to the cold start injector and with a test light found that there was still signal. Should the signal not be there when the truck is running? Is this an ecu issue. I have checked the sensor for the cold start injector and it is good. I dont think it would be an issue with the coolant temperature sensor as that sensor feeds the ecu and not the cold start injector.

Any help would be greatly appreciated.
Need help 86 runner is offline  
Old 09-28-2016, 03:50 PM
  #2  
Registered User
 
Flash319's Avatar
 
Join Date: Feb 2006
Location: Barrie, Ontario CANADA
Posts: 1,730
Likes: 0
Received 0 Likes on 0 Posts
I believe it is. The cold start injector timer that is mounted in the coolent manifold beside the temp sensor controls the duration of operation. It provides the ground/power (cant remember)but only for a few seconds if the coolent temp is cold enough. These units are known to fail.

Last edited by Flash319; 09-28-2016 at 03:52 PM.
Flash319 is offline  
Old 09-29-2016, 08:42 AM
  #3  
Registered User
 
RAD4Runner's Avatar
 
Join Date: Mar 2012
Posts: 5,892
Received 87 Likes on 71 Posts
When you're cranking, CSI gets positive 12V. However, ground is controlled by CSI timer switch. On 1986 22RE ECU does not mess with CSI.

See schematic and test points/readings here.
When coolant is cold - when CSI timer switch as low resistance- it provides ground to negative side of CSI. After a certain time / temp contact IN CSI timer it disconnects ground to prevent CSI from running too long.

Please make sure you are checking the correct Temp sensor. Disconnect the connector from the CSI Timer instead. IF you still have the problem, you probably have a short in the ground circuit.
RAD4Runner is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
CHEEZE
Vehicles - Trailers (Complete)
1
07-11-2017 05:48 PM
10ac
86-95 Trucks & 4Runners
12
07-25-2016 07:44 PM
nuknuk
86-95 Trucks & 4Runners
12
07-22-2016 08:34 AM
Robert Otte
86-95 Trucks & 4Runners (Build-Up Section)
4
07-17-2016 05:38 PM


Thread Tools
Search this Thread
Quick Reply: Should Cold Start Injector always receive signal?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: