1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

Grid Heater??

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  #1  
Old 12-03-2010 | 07:22 AM
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Default Grid Heater??

wheres the timer located on the grid heater change the solenoids still not working want to find the timer and try changing that next any one know?
 
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Old 12-03-2010 | 08:28 AM
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Its in the computer.
 
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Old 12-03-2010 | 11:06 AM
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ya the computer runs the grid heaters and somethin else and thats all on these trucks. pretty basic
 
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Old 12-03-2010 | 01:01 PM
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what would i have to do to fix it
 
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Old 12-03-2010 | 07:02 PM
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On a Non-intercooled '91 the "timer" is on the firewall, near the column.
On a '91.5 (Intercooled) it's behind the battery in the fender.

There are several reasons the grid heaters won't activate and a bad timer is only 1.
You could have a bad air temp sensor or bad wiring connections from the timer to the solenoids.

Troubleshoot it like you would anything else, verify that each peripheral component works, such as the solenoids and the grid heating elements.

Mark.
 
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Old 12-06-2010 | 06:45 AM
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solenoids are good where is the air temp sensor located
 
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Old 12-06-2010 | 07:30 AM
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top of the manifold(2 pin). their is an entire book about grid heater diagnosis and operation in the sticky that shows its location( i believe)
 
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Old 12-06-2010 | 08:56 AM
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If it's a non-intercooled '91, the air temp sensor is located in the head, directly below the grid heater elements and passes through the large throttle bracket assembly.

Mark.
 
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