600 SCI no power at fuel pump
06-13-2020 | 06:50 AM
#12
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Joined: Oct 2015
Posts: 17
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Any help or advise available here please,
I now find I have no 12v power to red / white wire on main power relay, have checked all fuse etc, if I put 12v to red white wire everything works as it should and runs fine with no faults, this confirms the yellow and purple earth circuit wire from ecm is working,
any help here please.
I now find I have no 12v power to red / white wire on main power relay, have checked all fuse etc, if I put 12v to red white wire everything works as it should and runs fine with no faults, this confirms the yellow and purple earth circuit wire from ecm is working,
any help here please.
06-13-2020 | 07:21 AM
#13
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Joined: Nov 2009
Posts: 4,198
Likes: 500
From: KY
I don't have the wiring diagram for the 600 sci so I'm using the 496 wiring. In most cases the arrangement will be the same, only the pin out and colors will differ.
Main power comes in and connects to pins 30 and 86. When the PCM applies a ground on pin 85 the relay closes
With you not having power going to the relay, there may be a fuse further down that has blown. On post 42 of the thread there was a recall to change the fuse to a higher value
Merc 600 SCI IAC 1 Amp Fuse Install
Main power comes in and connects to pins 30 and 86. When the PCM applies a ground on pin 85 the relay closes
With you not having power going to the relay, there may be a fuse further down that has blown. On post 42 of the thread there was a recall to change the fuse to a higher value
Merc 600 SCI IAC 1 Amp Fuse Install
