Pinpoint Test G : The A/C (Air Conditioning) Is Inoperative

WARNING: This page is about a different car, the 2017 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

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

G1 CHECK THE A/C (AIR CONDITIONING) SYSTEM PRESSURE

Ignition OFF.

With the R-134a manifold gauge set connected, check the A/C system pressure.

Is the A/C system pressure above 290 kPa (42 psi)?

Yes

GO to G2

No	CHECK the A/C system for leaks. REFER to: Electronic Leak Detection . REFER to: Fluorescent Dye Leak Detection . After leak is repaired, RECHARGE the A/C system. REFER to: Air Conditioning (A/C) System Recovery, Evacuation and Charging .

G2 CHECK THE COMMUNICATION NETWORK

Ignition ON.

Using a diagnostic scan tool, carry out the network test.

Do the FCIM and the PCM pass the network test?

Yes

GO to G3

No	DIAGNOSE the FCIM or PCM does not communicate with the diagnostic scan tool. REFER to: Communications Network .

G3 CHECK THE PCM (POWERTRAIN CONTROL MODULE) (A/C) PRESSURE SENSOR (ACP_PRESS) PID (PARAMETER IDENTIFICATION)
- Ignition ON.
- Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).
- With a manifold gauge set connected, compare the pressure readings of the manifold gauge set and the PCM ACP_PRESS PID.
Are the pressure values of the manifold gauge set and the ACP_PRESS PCM PID within ± 15 psi (103 kPa)?

Yes GO to G4

No INSTALL a new A/C pressure transducer. REFER to: Air Conditioning (A/C) Pressure Transducer .

G4 ELECTRIC COOLING FAN FUNCTIONAL CHECK

Ignition ON.

Using a diagnostic scan tool, carry out the PCM KOEO self-test.

Does the electric cooling fan operate sometime during the KOEO self-test?

Yes

GO to G5

No	DIAGNOSE the electric cooling fan operation. REFER to Engine Controls - Symptom Charts (Except Diesel & Hybrid) .

G5 VERIFY THE GRILLE SHUTTER OPERATION USING THE PCM (POWERTRAIN CONTROL MODULE) GRILL SHUTTER A POSITION - COMMANDED (GRILL_A_CMD) PID (PARAMETER IDENTIFICATION)

Start the engine and allow it to idle for at least 30 seconds to allow for the grille shutter calibration to complete.

Using a diagnostic scan tool, view PCM PID.

Using a diagnostic scan tool, select the PCM PID GRILL_A_CMD and command the grille shutter from 100% (open) to 0% (closed) while observing the grille shutter operation from the front of the vehicle.

Does the grill shutter fully open and close when commanded by the scan tool?

Yes

GO to G6

No	DIAGNOSE the active grille shutter is inoperative or does not operate correctly. REFER to: Active Grille Shutter .

G6 COMPARE THE EVAPORATOR TEMPERATURE SENSOR TO THE PCM (POWERTRAIN CONTROL MODULE) AMBIENT AIR TEMPERATURE (AAT) PID (PARAMETER IDENTIFICATION)

Ignition OFF.

Allow the vehicle exterior and interior to stabilize to ambient temperature.

Disconnect Evaporator temperature sensor C296 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C296-1 (component side)	Courtesy of FORD MOTOR COMPANY	C296-2 (component side)

Compare the resistance values to the table below:

Ambient Temperature °F (°C)	Approximate Resistance
-4.0°F (-20°C)	13.820 K ohms - 14.283 K ohms
32.0°F (°C)	4.790 K ohms - 4.915 K ohms
68.0°F (20°C)	1.830 K ohms - 1.900 K ohms
77.0°F (25°C)	1.475 K ohms - 1.530 K ohms
103.9°F (40°C)	790 - 825 ohms
139.9°F (60°C)	370 - 390 ohms

Ignition ON.

Using a diagnostic scan tool, view PCM Parameter Identifications (PIDs).

Monitor the AAT PID.

Are the temperature values similar?

Yes

GO to G7

No	INSTALL a new evaporator temperature sensor. REFER to: Evaporator Temperature Sensor .

G7 CHECK THE FCIM (FRONT CONTROLS INTERFACE MODULE) A/C (AIR CONDITIONING) SWITCH (CC_SW_AC) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) ON
- Using a diagnostic scan tool, view FCIM Parameter Identifications (PIDs).
- Monitor the CC_SW_AC PID.
- On the HVAC controls, select PANEL and then press the A/C button (indicator on).
Does the PID display Active with the A/C button pressed on?

Yes GO to G8

No GO to G15

G8 CHECK THE PCM (POWERTRAIN CONTROL MODULE) AIR CONDITIONING REQUEST SIGNAL (AC_REQ) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) ON
- Start the engine.
- Using a diagnostic scan tool, monitor the PCM AC_REQ PID.
- On the HVAC controls, select PANEL and then press the A/C button (indicator on).
Does the PID display Yes when the button is pressed?

Yes GO to G9

No GO to G15

G9 CHECK THE PCM (POWERTRAIN CONTROL MODULE) AIR CONDITIONING COMPRESSOR COMMANDED STATE (ACC_CMD) PID (PARAMETER IDENTIFICATION) WITH THE A/C (AIR CONDITIONING) COMMANDED ON
- Using a diagnostic scan tool, activate the PCM ACC_CMD PID.
Does the A/C compressor turn on?

Yes GO to G16

No GO to G10

G10 CHECK THE VOLTAGE TO THE A/C (AIR CONDITIONING) CLUTCH RELAY

Ignition OFF.

Disconnect the A/C clutch relay.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
A/C clutch relay socket 1	Courtesy of FORD MOTOR COMPANY	Ground
A/C clutch relay socket 3	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to G11

No	REFER to the OEM Electrical Wiring Diagram Introduction article to identify the possible causes of the circuit short.

G11 BYPASS THE A/C (AIR CONDITIONING) CLUTCH RELAY

Ignition OFF.

Connect a fused jumper wire:

Positive Lead	Measurement / Action	Negative Lead
A/C clutch relay socket 3	Courtesy of FORD MOTOR COMPANY	A/C clutch relay socket 5

Ignition ON.

Does the A/C compressor clutch engage?

Yes	REMOVE the fused jumper wire. INSTALL a new A/C clutch relay.

No	LEAVE the fused jumper wire installed. GO to G12

G12 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Disconnect A/C compressor clutch field coil C100 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C100-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes	REMOVE the fused jumper wire. GO to G13

No	REMOVE the fused jumper wire. VERIFY BJB fuse 22 (10A) is OK. If not OK, REFER to the OEM Electrical Wiring Diagram Introduction article to identify the possible causes of the circuit short. If OK, REPAIR the circuit.

G13 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH FIELD COIL GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C100-2	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to G14

No	REPAIR the circuit.

G14 CHECK THE A/C (AIR CONDITIONING) COMPRESSOR CLUTCH AIR GAP

Measure the A/C compressor clutch air gap at 3 equally spaced locations between the clutch hub and the A/C compressor clutch pulley. REFER to: Air Conditioning (A/C) Clutch Air Gap Adjustment .

Is the A/C compressor clutch air gap greater than 0.6 mm (0.0236 in)?

Yes	ADJUST the A/C compressor clutch air gap. REFER to: Air Conditioning (A/C) Clutch Air Gap Adjustment .

No	INSTALL a new A/C compressor clutch field coil. REFER to: Air Conditioning (A C) Clutch and Air Conditioning (A C) Clutch Field Coil .

G15 CHECK FOR CORRECT FCIM (FRONT CONTROLS INTERFACE MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all FCIM 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

Connect all FCIM 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new FCIM. For vehicles equipped with Sony® Audio System, REFER to: Front Controls Interface Module (FCIM) . For vehicles equipped with Touchscreen Display, REFER to: Front Controls Interface Module (FCIM) . For all other audio systems, REFER to: Front Controls Interface Module (FCIM) .

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.

G16 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM connectors.

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

Connect all PCM connectors. Make sure they seat and latch correctly.

Operate the system and verify the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new PCM. Refer to POWERTRAIN CONTROL MODULE (PCM) - 2.0L EcoBoost (184kW/250PS) - MI4. REFER to: POWERTRAIN CONTROL MODULE (PCM) - 2.7L EcoBoost (238kW/324PS). REFER to: POWERTRAIN CONTROL MODULE (PCM) - 3.5L Duratec (212kW/278PS).

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.