Infiniti G35 (V35) Sedan. Manual - part 554

EC-362

< COMPONENT DIAGNOSIS >

[VQ35HR]

P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION

P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION

Description

INFOID:0000000000956752

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 and it provides feed-
back to the ECM to control the throttle control motor to make the throttle valve opening angle properly in
response to driving condition.

DTC Logic

INFOID:0000000000956753

DTC DETECTION LOGIC

NOTE:
If DTC P1233 or P2101 is displayed with DTC P1238, P1290, P2100 or 2119, first perform the trouble
diagnosis for DTC P1238, P2119 or P1290, P2100. Refer to 

EC-369, "DTC Logic"

 or 

EC-374, "DTC

Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V 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-362, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000956754

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-42, "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 and ground.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1233

Electric throttle control 
performance (bank 2)

Electric throttle control function does not oper-
ate 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-363

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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 E3, F1
• Harness connectors F104, F105
• Harness for open or short between ECM and IPDM E/R

>> Repair open circuit or 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 E3, F1
• Harness for open or short between ECM and IPDM E/R

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

7.

CHECK FUSE

DTC

ECM

Ground

Condition

Voltage

Connector

Terminal

P1233

F102

52

Ground

Ignition switch OFF

Approx. 0V

Ignition switch ON

Battery voltage

P2101

F101

3

Ignition switch OFF

Approx. 0V

Ignition switch ON

Battery voltage

IPDM E/R

ECM

Continuity

Connector

Terminal

Connector

Terminal

E7

70

F101

25

Existed

DTC

IPDM E/R

ECM

Continuity

Connector

Terminal

Connector

Terminal

P1233

E7

54

F102

52

Existed

P2101

F101

3

EC-364

< COMPONENT DIAGNOSIS >

[VQ35HR]

P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION

1.

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

2.

Check 15A fuse for blown.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace 15A fuse.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "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.

10.

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY 

1.

Remove the intake air duct.

2.

Check if 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-365, "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

F27

5

F102

49

Existed

50

Not existed

6

49

Not existed

50

Existed

P2101

1

F6

1

F101

2

Existed

4

Not existed

2

2

Not existed

4

Existed

JMBIA0025ZZ

P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION

EC-365

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Refer to 

GI-39, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair or replace harness or connectors.

13.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace malfunction electric throttle control actuator.

2.

Go to 

EC-365, "Special Repair Requirement"

.

>> INSPECTION END

Component Inspection

INFOID:0000000000956755

1.

CHECK THROTTLE CONTROL MOTOR

1.

Turn ignition switch OFF.

2.

Disconnect electric throttle control actuator harness connector.

3.

Check resistance between electric throttle control actuator terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace malfunctioning electric throttle control actuator.

2.

Go to 

EC-365, "Special Repair Requirement"

.

>> INSPECTION END

Special Repair Requirement

INFOID:0000000000956756

1.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Refer to 

EC-18, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"

>> GO TO 2.

2.

PERFORM IDLE AIR VOLUME LEARNING

Refer to 

EC-18, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"

>> END

Electric throttle control actuator

Resistance

Bank

Terminals

1

1 and 2

Approx. 1 - 15 

Ω

 [at 25

°

C (77

°

F)]

2

5 and 6