Infiniti Q45. Manual — part 473

DTC P1217 ENGINE OVER TEMPERATURE

EC-531

C

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4.

CHECK COOLING FAN MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between cooling fan relay-3 terminal 1 and ECM terminal 89.
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E34, F34

●

Harness for open or short between cooling fan relay-2 and ECM

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

6.

CHECK COOLING FAN RELAY-3

Refer to

EC-532, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace cooling fan relay.

7.

CHECK COOLING FAN MOTOR-2

Refer to

EC-532, "Component Inspection"

.

OK or NG

OK

>> GO TO 8.

NG

>> Replace cooling fan motors.

8.

CHECK INTERMITTENT INCIDENT

Refer to

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

.

>> INSPECTION END

Continuity should exist.

EC-532

DTC P1217 ENGINE OVER TEMPERATURE

Main 13 Causes of Overheating

NBS0021X

*1: Turn the ignition switch ON.
*2: Engine running at 3,000 rpm for 10 minutes.
*3: Drive at 90 km/h (55 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-4, "OVERHEATING CAUSE ANALYSIS"

.

Component Inspection

NBS0021Y

COOLING FAN RELAY-1

1.

Apply 12V direct current between relay terminals 1 and 2.

2.

Check continuity between relay terminals 3 and 5, 6 and 7.

3.

If NG, replace relay.

COOLING FAN RELAYS-2 AND -3

1.

Apply 12V direct current between relay terminals 1 and 2.

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

50 - 50% coolant mixture

MA-11

3

●

Coolant level

●

Visual

Coolant up to MAX level
in reservoir tank and radi-
ator filler neck

CO-8

4

●

Radiator cap

●

Pressure tester

59 - 98 kPa

(0.6 - 1.0 kg/cm

2

, 9 - 14

psi) (Limit)

CO-12

ON*

2

5

●

Coolant leaks

●

Visual

No leaks

CO-8

ON*

2

6

●

Thermostat

●

Touch the upper and
lower radiator hoses

Both hoses should be hot

CO-22

ON*

1

7

●

Cooling fan

●

CONSULT-II

Operating

See trouble diagnosis for
DTC P1217 (

EC-514

).

OFF

8

●

Combustion gas leak

●

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
reservoir tank

●

Visual

No overflow during driving
and idling

CO-8

OFF*

4

10

●

Coolant return from
reservoir tank to radia-
tor

●

Visual

Should be initial level in
reservoir tank

CO-8

OFF

11

●

Water control valve

●

Remove and inspect
the valve

Within the specified value

CO-22

OFF

12

●

Cylinder head

●

Straight gauge feeler
gauge

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

EM-67

13

●

Cylinder block and pis-
tons

●

Visual

No scuffing on cylinder
walls or piston

EM-83

Condition

Continuity

12V direct current supply between
terminals 1 and 2

Yes

OFF

No

PBIB0077E

DTC P1217 ENGINE OVER TEMPERATURE

EC-533

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EC

2.

Check continuity between relay terminals 3 and 5.

3.

If NG, replace relay.

COOLING FAN MOTORS-1 AND -2

1.

Disconnect cooling fan motor harness connectors.

2.

Supply cooling fan motor terminals with battery voltage and
check operation.

Cooling fan motor should operate.
If NG, replace cooling fan motor.

Conditions

Continuity

12V direct current supply between terminals
1 and 2

Yes

No current supply

No

PBIB0098E

Cooling fan speed

Cooling fan motor terminals

(+)

(

−

)

Middle (MID)

1

3 and 4

2

3 and 4

1 and 2

3

1 and 2

4

High (HI)

1 and 2

3 and 4

SEF734W

EC-534

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)

PFP:17001

Description

NBS0021Z

SYSTEM DESCRIPTION

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

This system controls the fuel pump operation. The amount of fuel flow delivered from the fuel pump is altered
between two flow rates by the FPCM operation. The FPCM determines the voltage supplied to the fuel pump
(and therefore fuel flow) according to the following conditions.

COMPONENT DESCRIPTION

The FPCM adjusts the voltage supplied to the fuel pump to control
the amount of fuel flow. When the FPCM increases the voltage sup-
plied to the fuel pump, the fuel flow is increased. When the FPCM
decreases the voltage, the fuel flow is decreased.

CONSULT-II Reference Value in Data Monitor Mode

NBS00220

Specification data are reference values.

On Board Diagnosis Logic

NBS00221

Sensor

Input Signal to ECM

ECM function

Actuator

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

Engine speed*

Fuel pump control

Fuel pump control module
(FPCM)

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Battery

Battery voltage*

Conditions

Amount of fuel flow

Supplied voltage

●

Engine cranking

●

Engine coolant temperature is below 10

°

C (50

°

F).

●

Engine is running under heavy load and high speed conditions

high

Battery voltage
(11 - 14V)

Except the above

low

Approximately 8V

SEF387X

MONITOR ITEM

CONDITION

SPECIFICATION

FPCM

●

Engine: Cranking

HI

●

Engine: Idle

●

Engine coolant temperature: More than 10

°

C (50

°

F)

LOW

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1220
1220

Fuel pump control module
(FPCM)

An improper voltage signal from the FPCM, which
is supplied to a point between the fuel pump and
the dropping resistor, is detected by ECM.

●

Harness or connectors
(FPCM circuit is shorted.)

●

Dropping resistor

●

FPCM