Infiniti FX35, FX50 (S51). Manual - part 864

P1217 ENGINE OVER TEMPERATURE

EC-997

< DTC/CIRCUIT DIAGNOSIS >

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>> Repair or replace malfunctioning part.

4.

CHECK RADIATOR CAP

Check radiator cap. Refer to 

CO-37, "RADIATOR CAP : Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace radiator cap.

5.

CHECK THERMOSTAT

Check thermostat. Refer to 

CO-47, "Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace thermostat

6.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-791, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace engine coolant temperature sensor.

7.

CHECK MAIN 12 CAUSES

If the cause cannot be isolated, check the following.

*1: Turn the ignition switch ON.

*2: Engine running at 3,000 rpm for 10 minutes.

*3: Drive at 90 km/h (56 MPH) for 30 minutes and then let idle for 10 minutes.

*4: After 60 minutes of cool down time.

For more information, refer to 

CO-29, "Troubleshooting Chart"

.

Engine

Step

Inspection item

Equipment

Standard

Reference page

OFF

1

• Blocked radiator
• Blocked condenser
• Blocked radiator grille
• Blocked bumper

• Visual

No blocking

—

2

• Coolant mixture

• Coolant tester

Refer to 

MA-13, "Anti-Freeze Coolant Mixture Ratio"

.

3

• Coolant  level

• Visual

Coolant up to MAX level in 
reservoir tank and radiator 
filler neck

CO-33, "Inspection"

4

• Radiator cap

• Pressure tester

Refer to 

CO-37, "RADIATOR CAP : Inspection"

.

ON*

2

5

• Coolant leakage

• Visual

No leakage

CO-33, "Inspection"

ON*

2

6

• Thermostat

• Touch the upper and 

lower radiator hoses

Both hoses should be hot

CO-47, "Inspection"

ON*

1

7

• Cooling fan

• CONSULT-III

Operating

EC-995, "Component 
Function Check"

OFF

8

• Combustion gas leak-

age

• Color checker chemical 

tester 4 Gas analyzer

Negative

—

ON*

3

9

• Coolant temperature 

gauge

• Visual

Gauge less than 3/4 when 
driving

—

• Coolant overflow to res-

ervoir tank

• Visual

No overflow during driving 
and idling

CO-33, "Inspection"

OFF*

4

10

• Coolant return from res-

ervoir tank to radiator

• Visual

Should be initial level in 
reservoir tank

CO-33, "Inspection"

OFF

11

• Cylinder head

• Straight gauge feeler 

gauge

0.1 mm (0.004 in) Maxi-
mum distortion (warping)

EM-251, "Inspection"

12

• Cylinder block and pis-

tons

• Visual

No scuffing on cylinder 
walls or piston

EM-265, "Inspection"

EC-998

< DTC/CIRCUIT DIAGNOSIS >

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P1217 ENGINE OVER TEMPERATURE

>> INSPECTION END

P1220 FUEL PUMP CONTROL MODULE (FPCM)

EC-999

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P1220 FUEL PUMP CONTROL MODULE (FPCM)

Description

INFOID:0000000005237478

When driving conditions demand a decrease in fuel supply, the fuel
pump control module (FPCM) reduces the supply voltage to the fuel
pump. When driving conditions demand an increase in fuel supply
(during engine start, low engine coolant temperature or high load),
the supply voltage to the fuel pump is increased.

DTC Logic

INFOID:0000000005237479

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
• Before performing the following procedure, confirm that battery voltage is between 12 - 15 V at idle.
• Before performing the following procedure, check that the engine coolant temperature is 

−

10

°

C

(14

°

F) or more.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE 

1.

Start engine and let it idle for at least 5 seconds.
If engine does not start, crank engine for at least 5 seconds.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-999, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237480

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-39, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

NNBIB0006ZZ

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1220

Fuel pump control module 
(FPCM)

During engine cranking, the signal voltage 
of the FPCM to the ECM is too low.

• Harness or connectors

(FPCM circuit is open or shorted)
(Fuel pump circuit is open or shorted)

• FPCM

EC-1000

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P1220 FUEL PUMP CONTROL MODULE (FPCM)

2.

CHECK FPCM POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect FPCM harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between FPCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors B3, E121
• 15 A fuse (No.41)
• Harness for open or short between FPCM and IPDM E/R

>> Repair open circuit, short to ground or short to power in harness or connectors.

4.

CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check the continuity between FPCM harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair open circuit or short to power in harness or connectors.

5.

CHECK FPCM INPUT AND OUTPUT CIRCUITS FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check the continuity between FPCM harness connector and ECM harness connector.

3.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors B1, M7
• Harness for open or short between FPCM and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors.

FPCM

Ground

Voltage

Connector

Terminal

B31

10

Ground

Battery voltage

FPCM

Ground

Continuity

Connector

Terminal

B31

5

Ground

Existed

FPCM

ECM

Continuity

Connector

Terminal

Connector

Terminal

B31

8

M160

125

Existed

9

112