Test Procedure

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION table of fault code setting condition.

FAULT CODE SETTING CONDITION

Fault Code	KOEO	KOER	Continuous Memory
P0116			DL24
P0117	DL7	DL7	DL15
P0118	DL7	DL7	DL15
P0119			DL15
P0125			DL22
P0128			DL22
P0217	DL21	DL21	DL21
P1116	DL1	DL1
P1117			DL15
P1285	DL18	DL18	DL18
P1288	DL1	DL1	DL1
P1289	DL7	DL7	DL15
P1290	DL7	DL7	DL15
P1299			DL21

DL1 SELF-TEST DTCS P1288 OR P1116: CHECK THE COOLING SYSTEM

The DTC indicates the temperature sensor is out of self-test range. The engine is not at normal operating temperature.
Possible causes:
- Cold engine.
- Low engine coolant.
- Engine overheat.
- Damaged harness.
- CHT sensor.
- Faulty or damaged PCM.
Check the vehicle coolant level.

WARNING: TO AVOID PERSONAL INJURY DO NOT UNSCREW THE COOLANT PRESSURE RELIEF CAP WHILE THE ENGINE IS OPERATING OR HOT. THE COOLING SYSTEM IS UNDER PRESSURE. STEAM AND HOT LIQUID CAN COME OUT FORCEFULLY WHEN THE CAP IS LOOSENED SLIGHTLY.

Is the cooling system OK?

Yes	No
GO to DL2.	REFER to the appropriate ENGINE COOLING article for cooling system diagnostics. Repair as necessary.

DL2 CHECK IF THE VEHICLE ENGINE STARTS

Attempt to start the engine.

Does the engine start and run normally?

Yes	No
GO to DL5.	GO to DL3.

DL3 CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE OFF

NOTE: IMPORTANT Marauder Only - See the pinpoint test INTRODUCTION for important ECT\CHT sensor information.

Key OFF.
CHT Sensor connector disconnected.
Measure the resistance between:

( + )CHT Sensor Connector, Component Side	( - )CHT Sensor Connector, Component Side
CHT	SIGRTN

NOTE: REFER to the CYLINDER HEAD TEMPERATURE SENSOR EXPECTED VALUES table at the beginning of this test for resistance specifications.

Is the resistance within specification?

Yes	No
GO to DL4.	INSTALL a new CHT sensor.

DL4 CHECK CIRCUIT FROM MODULE TO COMPONENT

CHT Sensor connector connected.
Key ON Engine OFF.
Access the PCM -CHT V PID.
Using the data collected from the previous step, compare temperature resistance measured at the sensor to the PID temperature voltage measured at the PCM.

NOTE: REFER to the CYLINDER HEAD TEMPERATURE SENSOR EXPECTED VALUES table at the beginning of this test for resistance specifications.

Does the measured value at the sensor agree with measured PID value at the PCM?

Yes	No
No Start or Stalls Concern is elsewhere. RETURN to SYMPTOM CHARTS - CNG, FLEX-FUEL & GASOLINE for further direction.	CHECK the harness GO to DL12.

DL5 CHECK THE CHT SENSOR OPERATION

Run the engine until the engine temperature stabilizes.
Verify the upper radiator hose is hot and the cooling system is pressurized.
Rerun the KOEO self-test.
CHECK Self-Test DTCs:

Are DTCs P1288 or P1116 present?

Yes	No
GO to DL6.	The engine temperature was not stabilized. REPAIR any other DTCs as necessary.

DL6 CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE RUNNING

CAUTION: While conducting checks with a running engine ensure adequate safety precautions are observed to prevent contact with moving engine parts. For example; ensure ties or loose clothing do not come into contact with the cooling fan or drive belts.

Vehicle must be at normal operating temperature.
NOTE: IMPORTANT Marauder Only - See the pinpoint test INTRODUCTION for important ECT\CHT sensor information.
CHT Sensor connector disconnected.
Measure the resistance between:

( + )CHT Sensor Connector, Component Side	( - )CHT Sensor Connector, Component Side
CHT	SIGRTN

NOTE: REFER to the CYLINDER HEAD TEMPERATURE SENSOR EXPECTED VALUES table at the beginning of this test for resistance specifications.

Is the resistance within specification?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	INSTALL a new CHT sensor.

DL7 DTCS P0117, P0118, P1289 OR P1290: ACCESS THE CHT PID AND CHECK THE VOLTAGE

NOTE: IMPORTANT Marauder Only - See the pinpoint test INTRODUCTION for important ECT\CHT sensor information.

Key ON Engine OFF.
Access the PCM -CHT V PID.

Is the voltage less than 0.2 V?

Yes	No
KEY OFF. GO to DL8.	KEY OFF. GO to DL9.

DL8 CHECK FOR A GROUNDED CIRCUIT

CHT Sensor connector disconnected.
Key ON Engine OFF.
Access the PCM -CHT V PID.

Is the voltage greater than 4.6 V?

Yes	No
INSTALL a new CHT sensor.	GO to DL14.

DL9 CHECK FOR A VREF SHORT

CHT Sensor connector disconnected.
Key ON Engine OFF.
Access the PCM -CHT V PID.
Connect a 5 amp fused jumper wire between the following:

Point A CHT Sensor Connector, Harness Side	Point B CHT Sensor Connector, Harness Side
CHT	SIGRTN

Does a scan tool communication concern exist?

Yes	No
REMOVE the jumper. GO to DL13.	REMOVE the jumper. GO to DL10.

DL10 CHECK THE CHT CIRCUIT FOR A SHORT TO POWER

NOTE: IMPORTANT Marauder Only - See the pinpoint test INTRODUCTION for important ECT\CHT sensor information.

CHT Sensor connector disconnected.
Key ON Engine OFF.
Measure the voltage between:

( + )CHT Sensor Connector, Harness Side	( - )
CHT	Ground

Is the voltage greater than 5.5 V?

Yes	No
KEY OFF. REPAIR short circuit to PWR. CHECK the Sensor for damage GO to DL11.	KEY OFF. GO to DL11.

DL11 CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE OFF

NOTE: IMPORTANT Marauder Only - See the pinpoint test INTRODUCTION for important ECT\CHT sensor information.

CHT Sensor connector disconnected.
Measure the resistance between:

( + )CHT Sensor Connector, Component Side	( - )CHT Sensor Connector, Component Side
CHT	SIGRTN

NOTE: REFER to the CYLINDER HEAD TEMPERATURE SENSOR EXPECTED VALUES table at the beginning of this test for resistance specifications.

Is the resistance within specification?

Yes	No
GO to DL12.	INSTALL a new CHT sensor.

DL12 CHECK THE SIGNAL AND SIGRTN CIRCUITS FOR AN OPEN IN THE HARNESS

PCM connector disconnected.
Measure the resistance between:

( + )CHT Sensor Connector, Harness Side	( - )PCM Connector, Harness Side
CHT	CHT
SIGRTN	SIGRTN

Are the resistances less than 5 ohms?

Yes	No
GO to DL13.	REPAIR open circuit.

DL13 CHECK THE SENSOR SIGNAL FOR A SHORT TO VREF

Key OFF.
PCM connector disconnected.
Measure the resistance between:

( + )PCM Connector, Harness Side	( - )PCM Connector, Harness Side
CHT	VREF

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	REPAIR short circuit to VREF.

DL14 CHECK THE SENSOR SIGNAL FOR A SHORT TO GROUND

Key OFF.
PCM connector disconnected.
Measure the resistance between:

( + )PCM Connector, Harness Side	( - )PCM Connector, Harness Side
CHT	SIGRTN

Measure the resistance between:

( + )PCM Connector, Harness Side	( - )12V vehicle battery
CHT	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	REPAIR short circuit.

DL15 DTCS P0117, P0118, P0119, P1117, P1289 OR P1290: INTERMITTENT CHECK

NOTE: IMPORTANT Marauder Only - See the pinpoint test INTRODUCTION for important ECT\CHT sensor information.

Key ON Engine OFF.
Access the PCM -CHT V PID.
While observing the PID, carry out the following:
- Tap on the sensor to simulate road shock.
- Wiggle the sensor connector.

Is there a large change in the voltage reading?

Yes	No
DISCONNECT and INSPECT the connector. If OK, REPLACE the component.	GO to DL16.

DL16 CHECK THE ELECTRONIC ENGINE CONTROL (EC) WIRING HARNESS

Access the PCM -CHT V PID.
While observing the PID, carry out the following:
- Wiggle, shake, and bend small sections of the wiring harness while working from the sensor to the PCM.

Is there a large change in the voltage reading?

Yes	No
ISOLATE the fault Repair as necessary.	GO to DL17.

DL17 CHECK THE PCM AND VEHICLE HARNESS CONNECTORS

PCM connector disconnected.
CHT Sensor connector disconnected.

Are the connectors and terminals OK?

Yes	No
The fault is not present at this time Disregard the current Diagnostic Trouble Code (DTC) at this time. Address the next DTC. Go to POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINE for DTC charts.	Repair as necessary.

DL18 SELF-TEST DTC P1285: EARLY WARNING OF ENGINE OVERHEAT CONDITION

NOTE: IMPORTANT Marauder Only - See the pinpoint test INTRODUCTION for important ECT\CHT sensor information.

An engine overheat condition was sensed by the CHT sensor.
CHECK the cooling system for:
- Correct coolant level.
- Internal or external coolant leaks.
- Blockage of the radiator.
- Cooling fan operation.

NOTE: If the electric cooling fan does not operate, return to SYMPTOM CHARTS - CNG, FLEX-FUEL & GASOLINE for electric cooling fan DTC or symptom diagnosis.

Is the cooling system OK?

Yes	No
Check: CHT sensor GO to DL19.	REFER to the appropriate ENGINE COOLING article for cooling system diagnostics. Repair as necessary.

DL19 CHECK THE OPERATION OF THE CYLINDER HEAD TEMPERATURE SENSOR

Run the engine until the engine temperature stabilizes.
Verify the upper radiator hose is hot and the cooling system is pressurized.
Rerun the KOEO self-test.
CHECK Self-Test DTCs:

Is DTC P1285 present?

Yes	No
GO to DL20.	Engine overheat temperature was not detected. REPAIR any other DTCs as necessary.

DL20 CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE RUNNING

Vehicle must be at normal operating temperature.
CHT Sensor connector disconnected.
Measure the resistance between:

( + )CHT Sensor Connector, Component Side	( - )CHT Sensor Connector, Component Side
CHT	SIGRTN

REFER to the CYLINDER HEAD TEMPERATURE SENSOR EXPECTED VALUES table at the beginning of this test for resistance specifications.

Is the resistance within specification?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	INSTALL a new CHT sensor.

DL21 SELF-TEST DTCS P0217 OR P1299: INDICATES AN ENGINE OVERHEAT CONDITION

NOTE: REFER to POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINE , Diagnostic Trouble Code (DTC) Description for possible causes and additional DTC description information.

CHECK the engine coolant level.

Is the engine coolant fill level correct?

Yes	No
REFER to the appropriate ENGINE COOLING article for cooling system diagnostics. Select Symptom Engine overheat	REFER to the appropriate ENGINE COOLING article for cooling system diagnostics. Select Symptom Loss of Engine Coolant

DL22 SELF-TEST DTCS P0125 OR P0128: CHECK THE ENGINE COOLANT LEVEL

NOTE: IMPORTANT Marauder Only - See the pinpoint test INTRODUCTION for important ECT\CHT sensor information.

Diagnostic Trouble Code (DTC) indicates the engine coolant temperature has not achieved the required engine operation temperature level, since start -up within a specified amount of time.
Possible causes:
- Insufficient warm up time.
- Leaking or stuck-open thermostat.
- Low engine coolant.

CHECK the engine coolant level.

Is the engine coolant fill level correct?

Yes	No
GO to DL23.	REFER to the appropriate ENGINE COOLING article for cooling system diagnostics. Select Symptom Loss of Engine Coolant

DL23 CHECK SENSOR OPERATION

Run the engine until the engine temperature stabilizes.
Verify the upper radiator hose is hot and the cooling system is pressurized.
Access the PCM -CHT PID.

Is the temperature greater than 77 C (170.6 F)?

Yes	No
Test Complete	REFER to the appropriate ENGINE COOLING article for cooling system diagnostics. Select Symptom Engine does not reach operating temperature

DL24 DTC P0116: CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE OFF

NOTE: VERIFY the engine temperature is at ambient room temperature before continuing with this test. A soak period of 6 hours may be required. REFER to Diagnostic Trouble Code DTC Descriptions, in POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINE for information concerning P0116.

NOTE: IMPORTANT Marauder Only - See the pinpoint test INTRODUCTION for important ECT\CHT sensor information.

Key OFF.
CHT Sensor connector disconnected.
Measure the resistance between:

( + )CHT Sensor Connector, Component Side	( - )CHT Sensor Connector, Component Side
CHT	SIGRTN

REFER to the CYLINDER HEAD TEMPERATURE SENSOR EXPECTED VALUES table at the beginning of this test for resistance specifications.

Is the resistance within specification?

Yes	No
Reconnect CHT. GO to DL25.	INSTALL a new CHT sensor.

DL25 DTC P0116: CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE RUNNING

Run the engine until the engine temperature stabilizes.

NOTE: Verify the engine is at operating temperature before taking the CHT reading.

CHT Sensor connector disconnected.
Measure the resistance between:

( + )CHT Sensor Connector, Component Side	( - )CHT Sensor Connector, Component Side
CHT	SIGRTN

REFER to the CYLINDER HEAD TEMPERATURE SENSOR EXPECTED VALUES table at the beginning of this test for resistance specifications.

Is the resistance within specification?

Yes	No
The fault is not present at this time CARRY OUT the OBD drive cycle to determine if fuel, HO2S, catalyst and misfire monitors can be executed. REFER to DRIVE CYCLES . Retest if necessary.	INSTALL a new CHT sensor.

DL26 DTC P0298: ENGINE OIL OVERTEMPERATURE CONDITION

Engine oil temperature protection strategy in the PCM has been activated.
This protects the engine against mechanical damage due to overheating.
REFER to POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINE , Diagnostic Trouble Code (DTC) Description for possible causes and additional DTC description information.
- CHECK for an overheating condition and base engine concerns.

Are there any overheating or base engine concerns?

Yes	No
ISOLATE the fault. REPAIR as necessary.	GO to DL27.

DL27 CHECK FOR CHT DTCS

CHECK Self-Test DTCs:

Are DTCs P1285, P1288, P1289 or P1299 present?

Yes	No
RETURN to Diagnostic Subroutines, POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINE , for direction in addressing the other DTCs.	GO to DL28.

DL28 ROAD TEST THE VEHICLE AND MONITOR FOR ENGINE OVERTEMPERATURE

Access the Freeze Frame Data (if available) and record the DTC malfunction conditions.
Access the PCM -CHT V PID.
Test drive the vehicle and allow the engine to reach normal operating temperature.
Observe CHT PID.

Does the engine overheat?

Yes	No
REFER to the appropriate ENGINE COOLING article for cooling system diagnostics. REPAIR as necessary.	Unable to duplicate or identify the fault at this time.

DL29 SELF-TEST DTC P0118: SIMULATE AN OPPOSITE SIGNAL TO THE PCM

CHT Sensor connector disconnected.
Key ON Engine OFF.
Access the PCM -CHT V PID.
Connect a 5 amp fused jumper wire between the following:

Point A CHT Sensor Connector, Harness Side	Point B CHT Sensor Connector, Harness Side
CHT	SIGRTN

Does a scan tool communication concern exist?

Yes	No
KEY OFF. REMOVE jumper wire(s) GO to DL32.	GO to DL30.

DL30 CHECK FOR OPEN IN THE HARNESS

Jumper installed.
Access the PCM -CHT V PID.

Is the voltage less than 0.2 V?

Yes	No
INSTALL a new CHT sensor. REMOVE jumper wire(s)	KEY OFF. REMOVE jumper wire(s) GO to DL31.

DL31 CHECK THE SIGNAL AND SIGRTN CIRCUITS FOR AN OPEN IN THE HARNESS

PCM connector disconnected.
Measure the resistance between:

( + )CHT Sensor Connector, Harness Side	( - )PCM Connector, Harness Side
CHT	CHT
SIGRTN	SIGRTN

Are the resistances less than 5 ohms?

Yes	No
GO to DL32.	REPAIR open circuit.

DL32 CHECK THE SENSOR SIGNAL FOR A SHORT TO VREF

Key OFF.
PCM connector disconnected.
Measure the resistance between:

( + )PCM Connector, Harness Side	( - )PCM Connector, Harness Side
CHT	VREF

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	REPAIR short circuit to VREF.

DL33 SELF-TEST DTC P0117: CHECK FOR A GROUNDED CIRCUIT

CHT Sensor connector disconnected.
Key ON Engine OFF.
Access the PCM -CHT V PID.

Is the voltage greater than 4.6 V?

Yes	No
INSTALL a new CHT sensor.	GO to DL34.

DL34 CHECK THE SENSOR SIGNAL FOR A SHORT TO GROUND

Key OFF.
PCM connector disconnected.
Measure the resistance between:

( + )PCM Connector, Harness Side	( - )PCM Connector, Harness Side
CHT	SIGRTN

Measure the resistance between:

( + )PCM Connector, Harness Side	( - )12V vehicle battery
CHT	Negative terminal

Is the resistance greater than 10K ohms?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	REPAIR short circuit.

DL35 ENGINE TEMPERATURE WARNING INDICATOR LAMP ON OR TEMPERATURE GAUGE INDICATES HOT, BUT ENGINE IS NOT OVERHEATING

NOTE: PCM Self -test must be performed prior to entering this Pinpoint Test.

Was the PCM self-test performed prior to entering this pinpoint test?

Yes	No
No DTCs present GO to DL36.	Concern is elsewhere. RETURN to SYMPTOM CHARTS - CNG, FLEX-FUEL & GASOLINE for further direction.

DL36 ENGINE TEMPERATURE INDICATOR LAMP ON OR TEMPERATURE GAUGE INDICATES HOT, WITH NO DTCS

NOTE: The Engine Temperature Warning Indicator (gauge or lamp) is a warning system that gives the driver information during an engine overheating condition. The PCM monitors the CHT sensor and determines if failsafe cooling mode is needed. If fail -safe cooling mode is needed, the PCM can signal the drive in 2 ways:

Temperature Warning Indicator information received through the vehicle Communication Link (SCP or CAN):
The PCM sends a SCP or CAN message to the instrument cluster to signal an overheating condition. This causes the instrument cluster indicator to illuminate and/or forces the temperature gauge to the H (hot) zone. DTC P1285 will also be stored in the PCM.
Temperature Warning Indicator hard wired to the PCM:
The PCM grounds the engine temperature warning circuit when the engine is overheating. This causes the instrument cluster indicator to illuminate and/or forces the temperature gauge to the H (hot) zone. DTC P1285 will also be stored in the PCM.
This pinpoint test ONLY diagnoses the PCM hardwire systems with no PCM DTCs. Currently only the Crown Victoria, Grand Marquis, Marauder and 2.3L Ranger use the hardwire system.
For any other type of Engine Temperature Warning Indicator system problems, refer to the appropriate service information article.
Possible causes:
- Damaged engine coolant temperature sensor.
- Instrument cluster concern.
- Wiring harness fault between PCM and Instrument Cluster.
- Damaged PCM.
PCM connector disconnected.
Key ON Engine OFF.

Does the engine temperature warning indicator lamp turn OFF (prove out) and\or the temperature gauge return to the normal zone with the PCM disconnected?

Yes	No
KEY OFF. INSTALL a new PCM. Refer to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .	PCM has not attempted to set the Warning Indicators. REFER to the appropriate INFORMATION, GAUGES & WARNING DEVICES article.