Pinpoint Test F: Engine Coolant Temperature Sensor 3

Refer to the appropriate Electronic Engine Controls - 2.5L for schematic and connector information.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P01E5:00	Engine Coolant Temperature Sensor 3 Circuit Low: No Sub Type Information	This DTC sets when the PCM senses low voltage on the ECT sensor 3 circuit, indicating a short to ground.
PCM P01E4:00	Engine Coolant Temperature Sensor 3 Circuit Range/Performance: No Sub Type Information	This DTC sets when the PCM senses voltage out of range on the ECT sensor 3 circuit.
PCM P01E6:00	Engine Coolant Temperature Sensor 3 Circuit High: No Sub Type Information	This DTC sets when the PCM senses high voltage on the ECT sensor 3 circuit, indicating a short to voltage.

Possible Causes

Wiring, terminals or connectors
ECT sensor 3
PCM

WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

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

NOTE: Before performing this pinpoint test, ensure the high voltage battery is at least 50 % charged. For charging information, refer to the appropriate High Voltage Battery, Mounting and Cables article .

F1 CHECK THE COOLANT HOSE ROUTING

NOTE: Routing of the coolant hoses is critical to proper engine cooling system operation.

Ignition OFF.

Check the cabin coolant heater system hose routing. Pay close attention to the diverter valve, heater core and exhaust heat exchanger hose routing. View the system diagrams, Refer to the appropriate Engine Cooling - System Operation and Component Description .

Are the coolant hoses routed correctly?

Yes	CLEAR all Continuous Memory Diagnostic Trouble Codes (CMDTCs) from all modules. TEST system for normal operation. If the concern is still present, GO to F2

No	CORRECT the coolant hose routing. Refer to the appropriate Engine Cooling - System Operation and Component Description .

F2 CHECK THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR 3 CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect PCM C1381B.

Disconnect ECT Sensor 3 C3235.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3235 Pin 1	Courtesy of FORD MOTOR COMPANY	Ground

Is there any voltage present?

Yes	REPAIR the circuit in question.

GO to F3

F3 CHECK THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR 3 CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Disconnect joint connector C126.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3235 Pin 1	Courtesy of FORD MOTOR COMPANY	Ground
C3235 Pin 2	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to F4

No	REPAIR the circuit in question.

F4 CHECK THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR 3 CIRCUITS FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3235 Pin 1	Courtesy of FORD MOTOR COMPANY	C126 Pin 7
C3235 Pin 2	Courtesy of FORD MOTOR COMPANY	C126 Pin 8
C126 Pin 7	Courtesy of FORD MOTOR COMPANY	C1381B Pin 45

Are the resistances less than 3 ohms?

Yes

GO to F5

No	REPAIR the circuit in question.

F5 CHECK THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR 3 CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3235 Pin 1	Courtesy of FORD MOTOR COMPANY	C3235 Pin 2

Is the resistance greater than 10, 000 ohms?

Yes

GO to F6

No	REPAIR the circuits.

F6 CHECK THE RESISTANCE OF THE ECT (ENGINE COOLANT TEMPERATURE) SENSOR 3

Measure:

Positive Lead	Measurement / Action	Negative Lead
ECT Sensor 3 Connector Pin 1, Component Side	Courtesy of FORD MOTOR COMPANY	ECT Sensor 3 Connector Pin 2, Component Side

Is the resistance between 0.527-1108 KOhms and does the resistance increase and decrease inversely proportional to engine coolant temperature?

Yes

GO to F7

No	Install a new ECT sensor 3. REFER to: Engine Coolant Temperature (ECT) Sensor (303-14 Electronic Engine Controls - 2.5L Duratec - Hybrid (121kW/164PS) (S3)).

F7 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the 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

Reconnect the 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 service articles: 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,

Courtesy of FORD MOTOR COMPANY

Guided Routine (PCM) only available in the on-line service information

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.