Infiniti M45 (Y34). Manual - part 437

DTC P1119 RADIATOR COOLANT TEMPERATURE SENSOR

EC-437

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Diagnostic Procedure

ABS002N9

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws. 
Refer to 

EC-141, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2. 

CHECK RADIATOR COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect radiator coolant temperature sensor harness con-
nector.

2.

Turn ignition switch ON.

3.

Check voltage between radiator coolant temperature sensor ter-
minal 1 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connector E34, F34

●

Harness for open or short between ECM and radiator coolant temperature sensor

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

PBIB1118E

PBIB0030E

Voltage: Approximately 5V

PBIB0080E

EC-438

DTC P1119 RADIATOR COOLANT TEMPERATURE SENSOR

4. 

CHECK RADIATOR COOLANT TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND 

SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between radiator coolant temperature sensor terminal 2 and ECM terminal 89.
Refer to Wiring Diagram.

4.

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 connector E34, F34

●

Joint connector-30

●

Harness for open or short between ECM and radiator coolant temperature sensor

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

6. 

CHECK RADIATOR COOLANT TEMPERATURE SENSOR

Refer to 

EC-438, "Component Inspection"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Replace radiator coolant temperature sensor.

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS002NA

RADIATOR COOLANT TEMPERATURE SENSOR

1.

Check resistance between radiator coolant temperature sensor
terminals 1 and 2 as shown in the figure.

Continuity should exist.

PBIB2005E

DTC P1119 RADIATOR COOLANT TEMPERATURE SENSOR

EC-439

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<Reference data>

CAUTION:

Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM's
transistor. Use a ground other than ECM terminals, such as
the ground.

2.

If NG, replace radiator coolant temperature sensor.

Removal and Installation

ABS002NB

RADIATOR COOLANT TEMPERATURE SENSOR

Refer to 

CO-12, "RADIATOR"

 .

Radiator coolant temperature

°

C (

°

F)

Resistance

k

Ω

20 (68)

2.437 - 2.595

90 (194)

0.2416 - 0.2575

SEF012P

EC-440

DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR

DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR

PFP:16119

Component Description

ABS002NC

Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor, etc.
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
Accelerator pedal position sensor detects the accelerator pedal position, the opening and closing speed of the
accelerator pedal and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the
accelerator pedal from these signals and controls the throttle motor based on these signals.
The throttle position sensor detects the throttle valve position, and the opening and closing speed of the throt-
tle valve and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the throttle
valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening
angle properly in response to driving condition.

On Board Diagnosis Logic

ABS002ND

These self-diagnosis has the one trip detection logic.

FAIL-SAFE MODE

When the malfunction is detected ECM enters fail-safe mode and the MIL lights up.

DTC Confirmation Procedure

ABS009R6

NOTE:

●

Perform PROCEDURE FOR MALFUNCTION A AND B first. If the DTC cannot be confirmed, perform
PROCEDURE FOR MALFUNCTION C.

●

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test.

PROCEDURE FOR MALFUNCTION A AND B

 With CONSULT-II

1.

Turn ignition switch ON and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Set selector lever to D position and wait at least 3 seconds.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Turn ignition switch ON and wait at least 1 seconds.

6.

Set selector lever to D position and wait at least 3 seconds.

7.

Turn ignition switch OFF, wait at least 10 seconds, and then turn
ON.

8.

If DTC is detected, go to 

EC-441, "Diagnostic Procedure"

 .

 With GST

Follow the procedure With CONSULT-II above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1121
1121

Electric throttle control 
actuator

A)

Electric throttle control actuator does not function 
properly due to the return spring malfunction.

●

Electric throttle control actuator

B)

Throttle valve opening angle in fail-safe mode is 
not in specified range.

C)

ECM detect the throttle valve is stuck open.

Detected items

Engine operating condition in fail-safe mode

Malfunction A

The ECM controls the electric throttle actuator by regulating the throttle opening around the idle position. 
The engine speed will not rise more than 2,000 rpm.

Malfunction B

ECM controls the electric throttle control actuator by regulating the throttle opening to 20 degrees or less.

Malfunction C

While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or more.

SEF058Y