Pinpoint Test Q : B10B5:11, B10B5:15

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.

Automatic Climate Control System for schematic and connector information.

Normal Operation and Fault Conditions

Sensor inputs, center register air discharge temperature sensor, REFER to: Climate Control System - Vehicles With: Electronic Automatic Temperature Control (EATC) - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
HVAC B10B5:11	Left Panel Air Discharge Temperature: Circuit Short To Ground	This DTC sets when the HVAC module senses lower than expected voltage on the sensor feedback circuit, indicating a short to ground.
HVAC B10B5:15	Left Panel Air Discharge Temperature: Circuit Short To Battery Or Open	This DTC sets when the HVAC module senses greater than expected voltage on the sensor feedback circuit, indicating a short to voltage or an open circuit or sensor.

Possible Sources

Wiring, terminals or connectors
Center register air discharge temperature sensor
HVAC control module

Visual Inspection and Pre-checks

Inspect loose or corroded HVAC control module and center register air discharge temperature sensor connections.

NOTE: Use the correct probe adapter(s) when making measurements. Failure to. Use the correct probe adapter(s) may damage the connector.

Q1 CHECK THE CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect HVAC control module C294A.

Disconnect HVAC control module C294B.

Disconnect Center register air discharge temperature sensor C2438.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C2438-1	Courtesy of FORD MOTOR COMPANY	Ground
Refer to C2438-2	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the affected circuits.

GO to Q2

Q2 CHECK THE CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C2438-1	Courtesy of FORD MOTOR COMPANY	Ground
Refer to C2438-2	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to Q3

No	REPAIR the affected circuits.

Q3 CHECK THE CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C2438-1	Courtesy of FORD MOTOR COMPANY	Refer to C294B-5

Positive Lead	Measurement / Action	Negative Lead
Refer to C2438-2	Courtesy of FORD MOTOR COMPANY	Refer to C294A-2

Are the resistances less than 3 ohms?

Yes

GO to Q4

No	REPAIR the affected circuits.

Q4 CHECK THE CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
Refer to C2438-1	Courtesy of FORD MOTOR COMPANY	Refer to C2438-2

Is the resistance greater than 10, 000 ohms?

Yes

GO to Q5

No	REPAIR the circuits.

Q5 CHECK FOR CORRECT CENTER REGISTER AIR DISCHARGE TEMPERATURE SENSOR OPERATION

Ignition OFF.

Inspect the disconnected connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect all disconnected connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	INSTALL a new center register air discharge temperature sensor. REFER to: Center Register Air Discharge Temperature Sensor . TEST the system for normal operation. If the concern is still present, GO to Q6

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

Q6 CHECK FOR CORRECT HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE OPERATION

Ignition OFF.

Disconnect and inspect all HVAC control module electrical connectors (if not previously disconnected).

Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary

Connect all HVAC control module electrical connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new HVAC control module. REFER to: Heating, Ventilation and Air Conditioning (HVAC) Control Module .

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.