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2012 transit connect Coming fans won't run. AC blows hot.

Customer Question
2012 transit connect Coming fans won't...
2012 transit connect
Coming fans won't run. AC blows hot.
Resistance of coolant temp fan switch is not open (very low resistance)
Tested at relay for pcm ground for both AC and Fan, neither was present. Grounded pcm side through jumper and fans run and AC clutch engages.
Shorted AC low pressure switch, no change in system Operation.
Does PCM have any other interlocking sensors that would defeat fans and not turn AC on? Do the AC switch or temp adjust dials need to be tested next?
Submitted: 10 months ago.Category: Ford
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Customer reply replied 10 months ago
Could you send the pins from the pcm to test if signal is coming from the switch?
Answered in 4 hours by:
9/19/2017
Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 10 months ago
HDGENE
HDGENE, Ford Senior Master/Diesel/Trans
Category: Ford
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Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 10 months ago

Hello, in the C175B Pcm connector the High fan is pin 18 a black wire and the low fan is pin 34 a red wire. If the wiring is good fromt he PCM to the fans then a check for codes of the PCM and check to see if the pcm is getting a signal from the ac switch to turn on the ac and cooling fans would need to be done.

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Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 10 months ago

Do you need more help with this concern?

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Customer reply replied 10 months ago
No codes when I scan it. Possible to get a description of the operation of the instrument cluster test mode?
Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 10 months ago

There is no Instrument cluster test mode. If you want to test the cluster, you have to have a dealer style scan tool to run a diagnostic check for codes on it and monitor live data.

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Customer reply replied 10 months ago
When I hold the odometer button, then turn key to on, the test mode comes up. When I cycle through, the dtc says none, it also gives Temp reading. But I'm not sure of the other functions. They are live though, and vary with engine speed and temp
Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 10 months ago

That is an engineer mode, its not meant for accurate diagnostics, but this link will explain some of that. This will not have an impact on the cooling fan concern.

http://www.fordwiki.co.uk/index.php/Instrument_Cluster_Self-Diagnostic_Mode

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Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 10 months ago

Do you need more help with this concern?

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Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 10 months ago

If you need more help please let me know. If i was helpful, please leave a positive rating using the 5 stars above.

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Ford Mechanic: HDGENE, Ford Senior Master/Diesel/Trans replied 10 months ago

Hello, I answered your questions, do you need more help?

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