Infiniti M45 (Y34). Manual - part 441

DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY

EC-453

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3. 

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

1.

Disconnect ECM harness connector.

2.

Check continuity between ECM terminal 157 and throttle control motor relay terminal 3.
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 connectors F33, E33

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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.

5. 

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 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F34, E34

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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

Refer to 

EC-454, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace throttle control motor relay.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Continuity should exist.

Continuity should exist.

EC-454

DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY

Component Inspection

ABS0031X

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.

Conditions

Continuity

12V direct current supply between terminals 
1 and 2

Yes

No current supply

No

PBIB0098E

DTC P1128 THROTTLE CONTROL MOTOR

EC-455

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DTC P1128 THROTTLE CONTROL MOTOR

PFP:16119

Component Description

ABS002NT

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.

On Board Diagnosis Logic

ABS002NU

This self-diagnosis has the one trip detection logic.

FAIL-SAFE MODE

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

DTC Confirmation Procedure

ABS002NV

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.

 WITH CONSULT-II

1.

Turn ignition switch ON and wait at least 2 seconds.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and let it idle for 5 seconds.

4.

If DTC is detected, go to 

EC-457, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure WITH CONSULT-II above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1128
1128

Throttle control motor 
circuit short

ECM detects short in both circuits between 
ECM and throttle control motor.

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

●

Electric throttle control actuator
(Throttle control motor)

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

EC-456

DTC P1128 THROTTLE CONTROL MOTOR

Wiring Diagram

ABS002NW

TBWA0300E