How to I test the fan? It's not coming on. What is the 3 prong female for near the harness connection on the schroud. Looking for how to hot wire to make sure it's the fan before I buy a new one. Has the red, black and small wire to the connector.
Thanks,
Steve
XC 90 2008 3.2 overheated / test question
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RickHaleParker
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Red, Black and Violet are the inputs to the Fan Control Module (FCM).
Red is supply voltage Positive, Black is supply voltage ground. Check across the Red and Black wires for 12 Volts.
Violet is the control line from the ECM.
It looks like the Violet is a simple current control line. That is the FCM turns of when either a current flows through the Violet wire.
From the wiring diagram, I cannot determination if the FCM is turned on by applying a voltage to, or by grounding the Violet wire. If it was in front of me it would be pretty simple to make a determination. Just monitor the line with a automotive logic probe as the engine warms up. The logic probe would tell if the ECM is applying a voltage, grounding the Violet wire ..... ect.
To check the fan motor there are two wires coming out of the other side of the Fan Control Module that run to the fan motor. Figure out which one is grounded then apply 12V across the two wires to test the fan motor.
4/71 is the FCM.
6/29 is the fan motor.
Red is supply voltage Positive, Black is supply voltage ground. Check across the Red and Black wires for 12 Volts.
Violet is the control line from the ECM.
It looks like the Violet is a simple current control line. That is the FCM turns of when either a current flows through the Violet wire.
From the wiring diagram, I cannot determination if the FCM is turned on by applying a voltage to, or by grounding the Violet wire. If it was in front of me it would be pretty simple to make a determination. Just monitor the line with a automotive logic probe as the engine warms up. The logic probe would tell if the ECM is applying a voltage, grounding the Violet wire ..... ect.
To check the fan motor there are two wires coming out of the other side of the Fan Control Module that run to the fan motor. Figure out which one is grounded then apply 12V across the two wires to test the fan motor.
4/71 is the FCM.
6/29 is the fan motor.
Active
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2017 Ford PIU. 3.5l, Twin Turbo, 365 Hp.
............................
Past
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. ( Killed by a plastic radiator. )
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion ( I moved, the project did not )
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0. ( Transmission dead after sitting for a winter )
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2017 Ford PIU. 3.5l, Twin Turbo, 365 Hp.
............................
Past
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. ( Killed by a plastic radiator. )
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion ( I moved, the project did not )
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0. ( Transmission dead after sitting for a winter )
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SuperHerman
- Posts: 1798
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Did you try turning on your A/C? It usually will trigger the fan.
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