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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum


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Old Today, 10:48 AM   #1 (permalink)
Alstrucks
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wait to start

Hi, is the "wait to start" light supposed to stay on steady or flash on and off for the glow plug heat up cycle, as well I can hear the glow plug controller clicking on and off at the same time as the WTS light flashes on and off? It is a 2000 GMC. Thanks

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Old Today, 11:01 AM   #2 (permalink)
Glagulator
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When the GPR clicks on-off-on-off.. that means the PCM has lost battery voltage.
It does that when the batteries have been disconnected or the ECM-B fuse is blown.
If just the batts disconnected it will start working correctly after a few start cycles.
If it keeps acting up then check the ECM-B fuse or why no 12v. batt to PCM.
ECM-B fuse also powers the LP.
Normally the GPR will stay on for about 8 seconds then cycle a few times when started.

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Old Today, 11:04 AM   #3 (permalink)
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Quote:
Originally Posted by Alstrucks View Post
Hi, is the "wait to start" light supposed to stay on steady or flash on and off for the glow plug heat up cycle, as well I can hear the glow plug controller clicking on and off at the same time as the WTS light flashes on and off? It is a 2000 GMC. Thanks
The WTS light should stay on steady during the duration of glow activation and turn off when the glows turn off.
So if you see the WTS light flash and it corresponds with the relay click it is doing what it is supposed to do when cycling the glows to warm the pre-chamber for starting.
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Old Today, 11:59 AM   #4 (permalink)
Alstrucks
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Hey Glagulator, that makes sense because I always disconnect my batteries when I am not running the engine because it is a project truck that I am fixing up for the road. The ECM-B fuse should be alright since I hear the lift pump as soon as I turn the key on. Thanks
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