Infiniti F50. Manual - part 450

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

EC-441

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6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F32, E32

●

Harness for open or short between ECM and throttle control motor relay

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

7. 

CHECK THROTTLE CONTROL MOTOR RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check continuity between ECM terminal 26 and throttle control motor relay terminal 1.
Refer to Wiring Diagram.

2.

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

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F32, E32

●

Harness for open or short between ECM and throttle control motor relay

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

9. 

CHECK THROTTLE CONTROL MOTOR RELAY

Refer to 

EC-442, "Component Inspection"

 .

OK or NG

OK

>> GO TO 10.

NG

>> Replace throttle control motor relay.

10. 

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 harness continuity between the following terminals.
Refer to Wiring Diagram.

5.

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

OK or NG

OK

>> GO TO 11.

NG

>> Repair or replace.

Continuity should exist.

Electric throttle control 

actuator terminal

ECM terminal

Continuity

3

151

Should not exist

154

Should exist

6

151

Should exist

154

Should not exist

PBIB0015E

EC-442

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

11. 

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY 

1.

Remove the intake air duct.

2.

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

OK or NG

OK

>> GO TO 12.

NG

>> Remove the foreign matter and clean the electric throttle

control actuator inside.

12. 

CHECK THROTTLE CONTROL MOTOR

Refer to 

EC-442, "Component Inspection"

 .

OK or NG

OK

>> GO TO 13.

NG

>> GO TO 14.

13. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> GO TO 14.

NG

>> Repair or replace harness or connectors.

14. 

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

Component Inspection

EBS00MHS

THROTTLE CONTROL MOTOR RELAY

1.

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

2.

Check continuity between relay terminals 3 and 5.

3.

If NG, replace throttle control motor relay.

THROTTLE CONTROL MOTOR

1.

Disconnect electric throttle control actuator harness connector.

PBIB0083E

Conditions

Continuity

12V direct current supply between terminals 
1 and 2

Yes

No current supply

No

PBIB0098E

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION

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2.

Check resistance between terminals 3 and 6.

3.

If NG, replace electric throttle control actuator and go to next
step.

4.

Perform 

EC-46, "Accelerator Pedal Released Position Learning"

.

5.

Perform 

EC-46, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-46, "Idle Air Volume Learning"

 .

Remove and Installation

EBS00MHT

ELECTRIC THROTTLE CONTROL ACTUATOR

Refer to 

EM-17, "INTAKE MANIFOLD"

 .

Resistance: Approximately 1 - 15 

Ω

 [at 25 

°

C (77

°

F)]

PBIB0095E

EC-444

DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY

DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY

PFP:16119

Component Description

EBS00MHU

Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle
control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends
an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition
switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not
provided to the ECM.

CONSULT-II Reference Value in Data Monitor Mode

EBS00MHV

Specification data are reference values.

On Board Diagnosis Logic

EBS00MHW

These self-diagnoses have the one trip detection logic.

FAIL-SAFE MODE

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

DTC Confirmation Procedure

EBS00MHX

NOTE:
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 DTC P1124

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8V.

 With CONSULT-II

1.

Turn ignition switch “ON” and wait at least 1 second.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

If DTC is detected, go to 

EC-447, "Diagnostic Procedure"

 .

MONITOR ITEM

CONDITION

SPECIFICATION

THRTL RELAY

●

Ignition switch: ON

ON

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1124
1124

Throttle control motor 
relay circuit short

ECM detects the throttle control motor relay is 
stuck ON.

●

Harness or connectors
(Throttle control motor relay circuit is 
shorted)

●

Throttle control motor relay

P1126
1126

Throttle control motor 
relay circuit open

ECM detects a voltage of power source for 
throttle control motor is excessively low.

●

Harness or connectors
(Throttle control motor relay circuit is 
open)

●

Throttle control motor relay

Engine operating condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return 
spring.

SEF058Y