F 350 2WD Super Duty V10-6.8L (2009)
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the
network test with the scan tool.
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Pinpoint Test F: The Auxiliary Heater Control Module (AHCM) Does Not Respond To The Scan Tool
Communications Network
Pinpoint Tests
Pinpoint Test F: The Auxiliary Heater Control Module (AHCM) Does Not Respond To The Scan Tool
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. See: Diagrams/Electrical
Diagrams/Diagrams By Number
Refer to Wiring Diagram Set 54, Manual Climate Control System for schematic and connector information. See: Diagrams/Electrical
Diagrams/Diagrams By Number
Normal Operation
The Auxiliary Heater Control Module (AHCM) is optional equipment on diesel engine vehicles only. The AHCM communicates with the scan tool
through the High Speed Controller Area Network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the
HS-CAN connection to the AHCM. Voltage for the AHCM is provided by circuit CVP37 (WH) and circuit GD108 (BK/VT) provides ground.
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
AHCM
PINPOINT TEST F: THE AHCM DOES NOT RESPOND TO THE SCAN TOOL
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.
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F1 CHECK THE AHCM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
-
Disconnect: AHCM C2463c.
-
Ignition ON.
-
Measure the voltage between the AHCM C2463c-1, circuit CBP37 (WH), harness side and ground.
-
Is the voltage greater than 10 volts?
Yes
GO to F2.
No
VERIFY the Smart Junction Box (SJB) fuse 37 (10A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams to
