how should I go about wiring the ford 4-wire heated o2?
i have traced my wires through schematics. the ones that are self explanatory are dedicated ground and eec power but the other two are quite vague.
one is shown to be going to the EGR system and the other goes back into the harness somewhere.
can someone shed some light on how this should be wired up. I know that this sensor needs some power for the heated part.
thanks
patrick
ford 4-wire heated o2
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If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
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1fastfox
- MegaSquirt Newbie
- Posts: 3
- Joined: Wed Oct 04, 2006 3:53 pm
- Location: Charleston, SC U.S.A.
ford 4-wire heated o2
93 LX Mustang Hatchback, 85 Turbo Coupe motor, 3" downpipe, T3 .60/.63, FMIC
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MegaScott
It would help a little if you explained which end of the harness you are looking at, the wire colors are different depending if you are looking into the connector at the sensor, or somewhere else, like the EEC connector.
Also it makes a difference if you have the TC sensor and harness or the Mustang sensor and harness.
It's easiest to corrolate the sensor wires to the harness wire colors, since the sensor wires are just black white or grey.
TC wire harness -
grey/yellow = heater power +12v
black/lt green = Ground
dark green/purple = signal to EEC pin 29
The stock TC sensor is a three wire sensor, so if you have a four wire sensor IIRC hook the black wires to 12v and ground, the grey or white wires are the sensor, one is ground, the other is signal.
4 wire sensor is wired like this -
Also it makes a difference if you have the TC sensor and harness or the Mustang sensor and harness.
It's easiest to corrolate the sensor wires to the harness wire colors, since the sensor wires are just black white or grey.
TC wire harness -
grey/yellow = heater power +12v
black/lt green = Ground
dark green/purple = signal to EEC pin 29
The stock TC sensor is a three wire sensor, so if you have a four wire sensor IIRC hook the black wires to 12v and ground, the grey or white wires are the sensor, one is ground, the other is signal.
4 wire sensor is wired like this -
Last edited by MegaScott on Wed Jul 11, 2007 11:33 am, edited 2 times in total.
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1fastfox
- MegaSquirt Newbie
- Posts: 3
- Joined: Wed Oct 04, 2006 3:53 pm
- Location: Charleston, SC U.S.A.
alright this is what I have as far as schematics goes:
black- dedicated ground
gray/light blue- EEC to o2 sensor
orange- fuel sensor ground to EEC
gray/yellow- I traced this back to the ignition switch
so using the picture:
I should be looking at:
black-ground
gray/light blue- o2 wire in ms harness.
orange- signal return
gray/yellow- +12v since it is traced to ignition switch.
does this look correct?
thanks
patrick
black- dedicated ground
gray/light blue- EEC to o2 sensor
orange- fuel sensor ground to EEC
gray/yellow- I traced this back to the ignition switch
so using the picture:
I should be looking at:
black-ground
gray/light blue- o2 wire in ms harness.
orange- signal return
gray/yellow- +12v since it is traced to ignition switch.
does this look correct?
thanks
patrick
93 LX Mustang Hatchback, 85 Turbo Coupe motor, 3" downpipe, T3 .60/.63, FMIC
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MegaScott
Looks good from here.1fastfox wrote:alright this is what I have as far as schematics goes:
black- dedicated ground
gray/light blue- EEC to o2 sensor
orange- fuel sensor ground to EEC
gray/yellow- I traced this back to the ignition switch
so using the picture:
I should be looking at:
black-ground
gray/light blue- o2 wire in ms harness.
orange- signal return
gray/yellow- +12v since it is traced to ignition switch.
does this look correct?
thanks
patrick