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Infiniti M45 (Y34). Manual - part 455

DTC P1217 ENGINE OVER TEMPERATURE

EC-509

DTC P1217 ENGINE OVER TEMPERATURE

PFP:00000

Description

ABS00334

If DTC P1217 is displayed with DTC P1119 or P1480, first perform the trouble diagnosis for DTC P1119
or P1480. Refer to

EC-434, "DTC P1119 RADIATOR COOLANT TEMPERATURE SENSOR"

EC-578,

"DTC P1480 COOLING FAN SPEED CONTROL SOLENOID VALVE"

SYSTEM DESCRIPTION

This system controls the cooling fan operating speed. The opening of the cooling fan speed control solenoid
valve changes to control oil pressure provided to the cooling fan drive pump.
This system consists of the cooling fan pump, cooling fan drive pump, cooling fan speed control solenoid
valve, oil cooler, cooling fan fluid reservoir, etc.
The cooling fan pump is operated by engine with the drive belts and provides oil pressure to the cooling fan
drive pump which operates the cooling fan. The cooling fan speed control solenoid valve is installed between
the cooling fan pump and cooling fan drive pump. The solenoid valve repeats ON/OFF operation according to
the signal sent from the ECM. The opening of the solenoid valve varies for optimum engine control. The opti-
mum value stored in the ECM is determined by considering various engine conditions.

COOLING FAN SPEED CONTROL

*: This signal is sent to the ECM through CAN communication line.

The ECM controls the cooling fan speed corresponding to the engine speed, the radiator coolant temperature,
refrigerant pressure, vehicle speed, air conditioner switch signal, etc.
The ECM determines the target fan speed based on the basic fan speed considering the radiator coolant tem-
perature and the engine speed. The ECM controls fan speed between 0 to 2,550 rpm.
When the cooling fan speed control solenoid valve is malfunctioning (does not operate), the cooling fan is
operated at the maximum speed by engine through the drive belts.

Cooling Fan Basic Speed

unit: rpm

PBIB0116E

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed

Cooling fan speed control

Cooling fan speed control
solenoid valve

Accelerator pedal position sensor

Accelerator pedal position

Radiator coolant temperature sensor

Radiator coolant temperature

Refrigerant pressure sensor

Refrigerant pressure

Wheel sensors*

Vehicle speed

A/C auto amp.*

Air conditioner switch signal

Air condi-

tioner

Refrigerant pressure

Vehicle speed

Less than 20 km/h

(12 MPH)

20 - 80 km/h

(12 - 50 MPH)

More than 80 km/h

(50 MPH)

OFF

300

EC-510

DTC P1217 ENGINE OVER TEMPERATURE

COMPONENT DESCRIPTION
Cooling Fan Speed Control Solenoid Valve

The cooling fan speed control solenoid valve uses a ON/OFF duty to control the pressure of the cooling fan
fluid from the cooling fan pump. This solenoid valve is moved by ON/OFF pulse from the ECM. The longer the
ON pulse is sent to the solenoid valve, the lower speed the cooling fan operates.

CONSULT-II Reference Value in Data Monitor Mode

ABS00335

Specification data are reference values.

On Board Diagnosis Logic

ABS00336

If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise.
When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is
indicated.
This self-diagnosis has the one trip detection logic.

CAUTION:

When a malfunction is indicated, be sure to replace the coolant following the procedure in the

MA-12,

"Changing Engine Coolant"

. Also, replace the engine oil.

Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Be sure to
use coolant with the proper mixture ratio. Refer to

MA-11, "Anti-Freeze Coolant Mixture Ratio"

After refilling coolant, run engine to ensure that no water-flow noise is emitted.

Less than 680 kPa (6.94 kg/cm

, 98.6 psi)

700

400

300

680 - 1,660 kPa (6.94 - 16.93 kg/cm

, 98.6 - 240.7 psi)

900

700

300

1,660 - 1,960 kPa (16.93 - 19.99 kg/cm

, 240.7 - 284.2 psi)

1,100

1,250

More than 1,960 kPa (19.99 kg/cm

, 284.2 psi)

1,250

1,200

1,250

Air condi-

tioner

Refrigerant pressure

Vehicle speed

Less than 20 km/h

(12 MPH)

20 - 80 km/h

(12 - 50 MPH)

More than 80 km/h

(50 MPH)

MONITOR ITEM

CONDITION

SPECIFICATION

TRGT FAN RPM

●

Ignition switch: ON (Engine stopped)

0 rpm

●

Engine: Idle

300 - 2,550 rpm

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1217
1217

Engine over temperature
(Overheat)

●

Cooling fan does not operate properly
(Overheat).

●

Cooling fan system does not operate
properly (Overheat).

●

Engine coolant was not added to the
system using the proper filling method.

●

Engine coolant is not within the speci-
fied range.

●

Harness or connectors
(The cooling fan speed control circuit is
shorted to ground.)

●

Cooling fan speed control solenoid valve

●

Cooling fan pump

●

Cooling fan drive pump

●

Cooling fan

●

Radiator coolant temperature sensor

●

Radiator hose

●

Radiator

●

Radiator cap

●

Water pump

●

Thermostat

●

Drive belts

For more information, refer to

EC-517, "Main

12 Causes of Overheating"

DTC P1217 ENGINE OVER TEMPERATURE

EC-511

Overall Function Check

ABS00338

Use this procedure to check the overall function of the cooling fan. During this check, a DTC might not be con-
firmed.

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pres-
sure fluid escaping from the radiator.
Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up
pressure to escape. Then turn the cap all the way off.

WITH CONSULT-II

Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to

EC-514,

"Diagnostic Procedure"

Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to

EC-514,

"Diagnostic Procedure"

Start engine and make sure that the cooling fan operates. If not,
go to

EC-514, "Diagnostic Procedure"

Select “TARGET FAN RPM” in “ACTIVE TEST” mode with CON-
SULT-II.

Change “TRGT FAN RPM” indication by touching “UP” and
“DOWN”, then make sure that the cooling fan operating speed
changes according to “TRGT FAN RPM” indication.

If the results are NG, go to

EC-514, "Diagnostic Procedure"

WITHOUT CONSULT-II

EC-514,

"Diagnostic Procedure"

Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to

EC-514,

"Diagnostic Procedure"

Start engine.

CAUTION:

Be careful not to overheat engine.

Make sure that the cooling fan operates. If not, go to