Pinpoint Test M : C1B14:11, C1B14:12
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.
- Refer to MANUAL CLIMATE CONTROL SYSTEM
for schematic and connector information.
Normal Operation and Fault Conditions
A 5-volt reference voltage and ground is supplied to the climate control sensors and actuators from the HVAC control module.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition HVAC C1B14:11 Sensor Supply Voltage A: Circuit Short To Ground This DTC sets when the module senses less than 5 volts on the sensor reference voltage circuit, indicating a short to ground. HVAC C1B14:12 Sensor Supply Voltage A: Circuit Short To Battery This DTC sets when the module senses greater than 5 volts on the sensor reference voltage circuit, indicating a short to voltage. Possible Sources
- Wiring, terminals or connectors
- HVAC control module
- NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- M1 CHECK THE HVAC (HEATING, VENTILATION AND AIR CONDITIONING) CONTROL MODULE
- Ignition ON.
- Using a diagnostic scan tool, perform HVAC control module self-test.
Is DTC C1B14:11 present?
Yes GO to M2 No GO to M5 - M2 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect HVAC control module C2357A.
- Measure:
Positive Lead Measurement / Action Negative Lead C2357A-3 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to M3 No REPAIR the circuit. - M3 CHECK THE REFERENCE VOLTAGE CIRCUIT AND THE SIGNAL RETURN CIRCUIT FOR A SHORT TOGETHER
- Ignition OFF.
Is the resistance greater than 200 ohms?
Yes GO to M6 No GO to M4 - M4 CHECK THE A/C (AIR CONDITIONING) COMPONENTS
- While measuring the resistance, disconnect the following components one at a time, in order. Stop disconnecting components if the measured resistance rises above 200 ohms.
- Air distribution door actuator C236
- Air inlet door actuator C289
- In-vehicle temperature sensor C2247
- Temperature door actuator C2092
Did the resistance rise above 200 ohms?
Yes INSTALL a new component (the last one to be disconnected). Refer to the appropriate article for the procedure. When installing an actuator, CONNECT the actuator electrical connector before the HVAC control module. This allows the actuator to be calibrated when the HVAC control module is connected. No REPAIR the circuit. - While measuring the resistance, disconnect the following components one at a time, in order. Stop disconnecting components if the measured resistance rises above 200 ohms.
- M5 CHECK THE REFERENCE VOLTAGE CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect HVAC control module C2357A.
- Measure:
Positive Lead Measurement / Action Negative Lead C2357A-3 Ground
Is any voltage present?
Yes REPAIR the circuit. No GO to M6 - M6 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.
Is the concern still present?
Yes CHECK OASIS for any applicable TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles 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.