Pinpoint Test P : B1B71:11, B1B71:13

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

P1 CHECK THE IPC (INSTRUMENT PANEL CLUSTER) OUTPUT VOLTAGE TO THE EVAPORATOR TEMPERATURE SENSOR

Ignition OFF.

Disconnect Evaporator Temperature Sensor C296 .

Ignition ON.

Select PANEL and press the A/C button (indicator on) on the HVAC controls.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C296-1	Courtesy of FORD MOTOR COMPANY	C296-3

Is the voltage between 4.7 and 5.1 volts?

Yes

GO to P2

GO to P3

P2 CHECK THE EVAPORATOR TEMPERATURE SENSOR

Ignition OFF.

Allow enough time for the evaporator to stabilize to the ambient temperature.

Measure:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY C296-1 (component side)	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY C296-3 (component side)

Compare the resistance values to the table below:

Ambient Temperature	Resistance
0-10 °C (32-50 °F)	5, 892-9, 893 ohms
10-20 °C (50-68 °F)	3, 689-6, 048 ohms
20-25 °C (68-77 °F)	2, 950-3, 805 ohms
25-30 °C (77-86 °F)	2, 374-3, 050 ohms
30-35 °C (86-95 °F)	1, 923-2, 460 ohms
35-40 °C (95-104 °F)	1, 566-1, 996 ohms
40-50 °C (104-122 °F)	1, 057-1, 630 ohms

Did the evaporator temperature sensor test OK?

Yes

GO to P7

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

P3 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect IPC C220A .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C296-1	Courtesy of FORD MOTOR COMPANY	Ground
C296-3	Courtesy of FORD MOTOR COMPANY	Ground

Is there any voltage present?

Yes	REPAIR the affected circuits.

GO to P4

P4 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C296-1	Courtesy of FORD MOTOR COMPANY	Ground
C296-3	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to P5

No	REPAIR the affected circuits.

P5 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C220A-24	Courtesy of FORD MOTOR COMPANY	C296-3
C220A-26	Courtesy of FORD MOTOR COMPANY	C296-1

Are the resistances less than 3 ohms?

Yes

GO to P6

No	REPAIR the affected circuits.

P6 CHECK THE EVAPORATOR TEMPERATURE SENSOR CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C296-1	Courtesy of FORD MOTOR COMPANY	C296-3

Is the resistance greater than 10, 000 ohms?

Yes	INSTALL a new evaporator temperature sensor. Refer to: Evaporator Temperature Sensor . If the concern is still present, GO to P7

No	REPAIR the circuits.

P7 CHECK THE IPC (INSTRUMENT PANEL CLUSTER) OPERATION

Ignition OFF.

Disconnect and inspect the IPC connector.

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 the IPC connector. Make sure it seats and latches 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, Refer to IPC Hardware Testing .

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.