Intermittant Wait to Start Light - ???????
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Semper Fi
Joined: Feb 2011
Posts: 771
Likes: 1
Intermittant Wait to Start Light - ???????
I did some searching and found a few threads with this problem but no one ever posted what they did to fix it.
Getting an internittant wait to start light. Truck has power as the dash has all the normal lights. But, I dont hear my vacuum pump running and the truck wont fire off until I cycle the key on and off several times until finally the WTS light comes on. Truck then starts normal.
Seems like the PCM is not powering up. Is that the ignition switch, PCM relay or the PCM itself?
Any help greatly appreciated.
Getting an internittant wait to start light. Truck has power as the dash has all the normal lights. But, I dont hear my vacuum pump running and the truck wont fire off until I cycle the key on and off several times until finally the WTS light comes on. Truck then starts normal.
Seems like the PCM is not powering up. Is that the ignition switch, PCM relay or the PCM itself?
Any help greatly appreciated.
Elder User
Joined: Feb 2005
Posts: 896
Likes: 1
From: Chattahoochee Hills, Ga.
After checking all (Including battery) connections to be sure they are tight and clean, I'd swap the PCM relay. They don't cost much and if that's not it you'll have a spare to rattle around in the glove box with your other spare stuff like I do ! Good luck and keep us posted.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Power goes from Fuse 30 to diode to PCM relay coil.
It also goes to the IDM relay coil.
It should have been labeled PCM/IDM Relay Diode.
Edit: 1999-2001 are essentially the same.
Upper left corner of Engine Control Drawing 1.
All 3 drawing are for engine control.
It also goes to the IDM relay coil.
It should have been labeled PCM/IDM Relay Diode.
Edit: 1999-2001 are essentially the same.
Upper left corner of Engine Control Drawing 1.
All 3 drawing are for engine control.
Posting Guru
Joined: Feb 2010
Posts: 1,411
Likes: 1
From: Opelika, AL
i had a similar issue and what was replaced was the fuse block under the dash. some of the connections were worn out and the fuse weren't making good contact from time to time.
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
When troubleshooting a circuit all fuses in the circuit should be removed, checked and tightly reseated.
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
See drawing 1.
Junction Box Fuse/Relay Panel is Under Dash (1999-2001).
Power Distribution Box is Under Hood (1999-2001).
Under dash 30 and under hood 24.
Junction Box Fuse/Relay Panel is Under Dash (1999-2001).
Power Distribution Box is Under Hood (1999-2001).
Under dash 30 and under hood 24.
Mountain Pass
Joined: Mar 2012
Posts: 234
Likes: 0
From: SoCal
Well, since it's an intermittent problem, you may need to monitor things for a while before you can draw any conclusions. If the blower starts working intermittently, then you know it was most likely the relay. If the WTS problem reappears, then you have at least probably isolated the relay as a probable cause (since it would be unlikely for both relays to start to die at the same time).
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Emory cloth to clean the spade terminals works good, just don't over do it.