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Loss of 9V ref. Why?
The 9V reference is good, until begining to crank the engine. It usually immediately drops to about 1.8V, and remains there until several seconds after key-off. Power and ground circuits at the PCM remain correct. In the very odd occurance that the 9V does not... Login to read more. 
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| Engine | 4.0 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
1993 Jeep Grand Cherokee Laredo 4.0L
| Engine | 4.0 L |
| Trans | 4-speed Automatic (Electronic) |
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