Infiniti F50. Manual - part 448

 

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Infiniti F50. Manual - part 448

 

 

DTC P1119 RADIATOR COOLANT TEMPERATURE SENSOR

EC-433

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Diagnostic Procedure

EBS00MHG

1. 

CHECK RADIATOR COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect radiator coolant temperature sensor harness con-
nector.

3.

Turn ignition switch “ON”.

4.

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

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connector E33, F33

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.

3. 

CHECK RADIATOR COOLANT TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND 

SHORT

1.

Turn ignition switch “OFF”.

2.

Check harness continuity between radiator coolant temperature sensor terminal 2 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 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connector E32, F32

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.

PBIB0030E

Voltage: Approximately 5V

PBIB0080E

Continuity should exist.

EC-434

DTC P1119 RADIATOR COOLANT TEMPERATURE SENSOR

5. 

CHECK RADIATOR COOLANT TEMPERATURE SENSOR

Refer to 

EC-434, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace radiator coolant temperature sensor.

6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

EBS00MHH

RADIATOR COOLANT TEMPERATURE SENSOR

1.

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

<Reference data>

*: These data are reference values and are measured between ECM terminal
122 (Radiator coolant temperature sensor) and body ground.

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

EBS00MHI

RADIATOR COOLANT TEMPERATURE SENSOR

Refer to 

CO-12, "RADIATOR"

 .

PBIB2005E

Radiator coolant 

temperature

°

C (

°

F)

Voltage*

V

Resistance

k

20 (68)

3.5

2.437 - 2.595

90 (194)

0.9

0.2416 - 0.2575

SEF012P

DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR

EC-435

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DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR

PFP:16119

Component Description

EBS00MHJ

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

EBS00MHK

This 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

EBS00MHL

NOTE:

Perform “PROCEDURE FOR MALFUNCTION A AND B” first. If the DTC cannot be confirmed, per-
form “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.

Shift 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.

Shift 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-436, "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

EC-436

DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR

PROCEDURE FOR MALFUNCTION C

 With CONSULT-II

1.

Turn ignition switch ON and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

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

4.

Shift selector lever to N or P position.

5.

Start engine and let it idle for 3 seconds.

6.

If DTC is detected, go to 

EC-436, "Diagnostic Procedure"

 .

 With GST

Follow the procedure “With CONSULT-II” above.

Diagnostic Procedure

EBS00MHM

1. 

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1.

Remove the intake air duct.

2.

Check if a foreign matter is caught between the throttle valve
and the housing.

OK or NG

OK

>> GO TO 2.

NG

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

2. 

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace the electric throttle control actuator.

2.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

4.

Perform 

EC-46, "Idle Air Volume Learning"

 .

>> INSPECTION END

SEF058Y

PBIB0083E

 

 

 

 

 

 

 

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