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Old 03-06-2011, 12:14 AM   #1 (permalink)
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Default CCRM keeps Failing and PCM 30 AMP fuse keeps blowing

On a 1993 Taurus 3.8 engine the CCRM (Constant Control Relay Module) keeps failing and the PCM 30AMP fuse keeps blowing. In all, I have replaced the CCRM with a used one three times and the 30AMP PCM fuse has blown three times. The trouble probably started when the cooling fan would not run. As a result, my sister-in-laws boyfriend connected the fan's hot wire to the red hot wire going to Pin 24 (PCM) in the CCRM and spliced a ground wire into the fan's ground wire (black) and connected the ground wire to the frame above the radiator. This was done about a year ago and I have left it wired like that until the most recent CCRM was replaced. Then, about 6 months ago the car would not start. I replaced the CCRM (the fuse had not blown) with a used one from the wrecking yard and the car ran that way until about 4 weeks ago. At which time the engine would not start. At which time, my sister-in-laws boyfriend replaced the CCRM but the car still would not start. I was out of town until about a week ago at which time I replaced the fuse and the car ran for about a day and the fuse blew again. I replaced the fuse again, but the car would not start. So, I replaced the CCRM with a used one and the car ran that way for a couple of days. At which time the fuse blew again. I replaced the fuse with a new one, but the car would not start. Again, it was obvious that the CCRM was out because the fuse had blown and the fuse was replaced but the fuse did not blow. A friend told me the problem was probably created when the brother-in-law wired the fan (which when wired properly is in a 60AMP circuit) into the PCM 30AMP circuit. Therefore, the fan eventuallly caused the CCRM to overheat and fail and either the fuse blew out concurrently with the CCRM or was caused to blow by the failure of the CCRM. Therefore, I disconnected the fan so it would not cause the CCRM to fail and installed another used CCRM I obtained at the wrecking yard. I made sure I installed the same model CCRM as was originally in the car. The engine started, but when I began to accelerate the engine died. I started it a second time and it died again. When I tried a third time it would not start. I checked the fuse and it had not blown this time. However, I know it is the CCRM again because I checked and there is no current getting to the fuel pump or the spark plugs. Any suggestions as to how to proceed to solve this problem would be greatly appreciated

Last edited by gary11; 03-06-2011 at 03:28 AM.
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Old 03-06-2011, 08:39 AM   #2 (permalink)
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To state the obviious, you need to find the cause of the excessive current draw that is blowing the fuse and overheating the relay in the CCRM.
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