Infiniti FX35, FX50 (S51). Manual - part 866

P1226, P1235 TP SENSOR

EC-1005

< DTC/CIRCUIT DIAGNOSIS >

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3.

Check that no foreign matter is caught between the throttle valve
(1) and the housing.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace malfunctioning electric throttle control actuator.

2.

Perform 

EC-1005, "Special Repair Requirement"

.

>> INSPECTION END

Special Repair Requirement

INFOID:0000000005237489

1.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to 

EC-581, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2.

2.

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-582, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END

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EC-1006

< DTC/CIRCUIT DIAGNOSIS >

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P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION

P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION

Description

INFOID:0000000005237490

Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc.
The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor. The throttle position
sensor provides feedback to the ECM, when opens/closes the throttle valve in response to driving conditions
via the throttle control motor.

DTC Logic

INFOID:0000000005237491

DTC DETECTION LOGIC

NOTE:
If DTC P1233 or P2101 is displayed with DTC P1238, P2119, first perform the trouble diagnosis for DTC
P1238, P2119. Refer to 

EC-1013, "DTC Logic"

.

If DTC P1233 or P2101 is displayed with DTC P1290, P2100, first perform the trouble diagnosis for DTC
P1290, P2100. Refer to 

EC-1018, "DTC 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 more than 11 V when
engine is running.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 2 seconds.

2.

Start engine and let it idle for 5 seconds.

3.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-1006, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237492

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.

2.

CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I

Check the voltage between ECM harness connector terminals as per the following.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1233

Electric throttle control 
performance (bank 2)

Electric throttle control function does not 
operate properly.

• Harness or connectors

(Throttle control motor circuit is open or 
shorted)

• Electric throttle control actuator

P2101

Electric throttle control 
performance (bank 1)

P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION

EC-1007

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Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 3.

3.

CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect IPDM E/R harness connector E7.

4.

Check the continuity between IPDM E/R harness connector and ECM harness connector.

5.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E10, F10
• Harness for open or short between ECM and IPDM E/R

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

5.

CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II

1.

Check the continuity between IPDM E/R harness connector and ECM harness connector.

2.

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 E10, F10
• Harness for open or short between ECM and IPDM E/R

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

7.

CHECK FUSE

DTC

ECM

Condition

Voltage (V)

+

–

Connector

Terminal

Connector

Terminal

P1233

F111

1

M160

128

Ignition switch OFF

Approx. 0

Ignition switch ON

Battery voltage

P2101

F110

49

Ignition switch OFF

Approx. 0

Ignition switch ON

Battery voltage

IPDM E/R

ECM

Continuity

Connector

Terminal

Connector

Terminal

E7

70

F110

19

Existed

DTC

IPDM E/R

ECM

Continuity

Connector

Terminal

Connector

Terminal

P1233

E7

54

F111

1

Existed

P2101

F110

49

EC-1008

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P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION

1.

Disconnect 15 A fuse (No. 51) from IPDM E/R.

2.

Check if 15 A fuse is blown.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace 15 A fuse.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> Repair or replace harness or connectors.

9.

CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT

1.

Turn ignition switch OFF.

2.

Disconnect electric throttle control actuator harness connector.

3.

Disconnect ECM harness connector.

4.

Check the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.

5.

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

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair or replace malfunctioning part.

10.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY 

1.

Remove the intake air duct.

2.

Check that no foreign matter is caught between the throttle valve
(1) and the housing.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

11.

CHECK THROTTLE CONTROL MOTOR

Refer to 

EC-1009, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 13.

12.

CHECK INTERMITTENT INCIDENT

DTC

Electric throttle control actuator

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P1233

2

F64

5

F111

2

Not existed

5

Existed

6

2

Existed

5

Not existed

P2101

1

F66

5

F110

50

Not existed

53

Existed

6

50

Existed

53

Not existed

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