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Thread: Mariner 225 Magnum TPS Diagnose
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10-21-2017, 12:15 PM #1Junior Member
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Mariner 225 Magnum TPS Diagnose
96 Mariner 225 magnum efi.
While testing the TPS I have 4.75 volts going in on the blue and yellow wire.
With key on throttle closed I have 3.76 volts coming out on the blue with red wire. (Should be 0)
With key on press the throttle slowly volts drop to
.74 volts. (Should increase)
Does this indicate a bad TPS?
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10-22-2017, 01:09 PM #2
Did you disconnect the 2 tan/blk head temp wires? Do you have the 91-816085 TPS test harness?
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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10-22-2017, 02:20 PM #3Junior Member
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10-22-2017, 03:03 PM #4
Have to disconnect those wires, tool is cheap and works great. That TPS is expensive don't want to miss diagnose.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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10-22-2017, 03:15 PM #5Junior Member
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10-22-2017, 03:33 PM #6
Not sure about eBay, got mine from a dealer.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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10-22-2017, 04:17 PM #7Junior Member
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10-24-2017, 02:46 PM #8Junior Member
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10-24-2017, 03:30 PM #9
Compression way low. Get a different gauge and retry.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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10-24-2017, 03:44 PM #10Junior Member
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