Pinpoint Test As : U010F

Normal Operation and Fault Conditions

REFER to: Electric Powertrain Control - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
SOBDMC U010F:00	Lost Communication With Air Conditioning Control Module: No Sub Type Information	This DTC sets when messages are missing from the ACCM

Possible Sources

Communications network concern
ACCM

AS1 CARRY OUT A VEHICLE INSPECTION AND VERIFY THE SELF-TEST PROCEDURE

NOTE: If the self-test or communication concern occurred after a failed or aborted reprogram, the module may be blank. Attempt to reprogram the module again before continuing with this pinpoint test.
- Visually inspect the following for obvious signs of electrical damage:
  - harness wiring
  - electrical connections
- Verify the correct procedure was used to activate the self-test for the scan tool. Refer to SCAN TOOL SETUP AND FUNCTIONALITY
Was the correct self-test procedure used?

Yes GO to AS2

No Refer to SCAN TOOL SETUP AND FUNCTIONALITY .

AS2 CARRY OUT THE NETWORK TEST
- Note: When using FDRS, the scan tool attempts to communicate with the PCM first. After establishing communication with the PCM, the scan tool then attempts to communicate with all modules on the vehicle. If an FDRS session cannot be established, FDRS may state no communication can be established with the PCM: When using FDRS, the scan tool attempts to communicate with the PCM first. After establishing communication with the PCM, the scan tool then attempts to communicate with all modules on the vehicle. If an FDRS session cannot be established, FDRS may state no communication can be established with the PCM:
  - Choose No when the scan tool prompts whether or not to retry communication.
  - Enter a PCM part number, tear tag or calibration number to identify the vehicle and start a session. The PCM part number and 4- character tear tag are located on the PCM.
- Ignition ON.
Do all modules indicate pass?

Yes GO to AS3

No GO to AS4

AS3 CHECK FOR AN ACCM (AIR CONDITIONING CONTROL MODULE) CONCERN

Using a diagnostic scan tool, perform the ACCM self-test.

Check for any other ACCM related symptoms.

Is a concern present?

Yes	DIAGNOSE the ACCM concern. REFER to: Climate Control System .

No	The system is operating correctly at this time. The concern may have been caused by module connections. Address the root cause of any connector or pin issues.

AS4 INVERTER SYSTEM CONTROLLER (ISC) SELF-TEST
- Confirm the Inverter System Controller (ISC) was the only module to fail.
Was the Inverter System Controller (ISC) the only module to fail?

Yes GO to AS5

No DIAGNOSE the network concern. REFER to: Communications Network .

AS5 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) B+ CIRCUIT FOR VOLTAGE

Ignition OFF.

Disconnect Inverter System Controller (ISC) C1458A.

Ignition ON.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1458A-M1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 10.5 volts?

Yes

GO to AS6

No	REPAIR the circuit.

AS6 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) VPWR CIRCUITS FOR VOLTAGE

Ignition OFF.

Connect a 5A fused jumper between:

Positive Lead	Measurement / Action	Negative Lead
C1458A-K3	Courtesy of FORD MOTOR COMPANY	Ground

Ignition ON.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1458A-L2	Courtesy of FORD MOTOR COMPANY	Ground
C1458A-M2	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 10.5 volts?

Yes

GO to AS7

No	REPAIR the circuit.

AS7 CHECK THE INVERTER SYSTEM CONTROLLER (ISC) GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
C1458A-L4	Courtesy of FORD MOTOR COMPANY	Ground
C1458A-M4	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 5 ohms?

Yes	DIAGNOSE the network concern. REFER to: Communications Network .

No	REPAIR the open circuit.