Nissan Qashqai (2007-2010). Manual - part 176

P1124, P1126 THROTTLE CONTROL MOTOR RELAY

EC-223

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

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P1124, P1126 THROTTLE CONTROL MOTOR RELAY

Description

INFOID:0000000001056445

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.

DTC Logic

INFOID:0000000001056446

DTC DETECTION 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 8V.

Witch DTC is detected?

P1124 >> GO TO 2.
P1126 >> GO TO 3.

2.

PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P1124

1.

Turn ignition switch ON and wait at least 1 second.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-223, "Diagnosis Procedure"

.

NO

>> INSPECTION END

3.

PERFORM DTC CONFIRMATION PROCEDURE FOR DTC P1126

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-223, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001056447

1.

CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Check voltage between ECM harness connector and ground.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1124

Throttle control motor 
relay circuit short

ECM detect the throttle control motor relay is 
stuck ON.

• Harness or connectors

(Throttle control motor relay circuit is 
shorted)

• Throttle control motor relay

P1126

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

EC-224

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

P1124, P1126 THROTTLE CONTROL MOTOR RELAY

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F123, E6
• Harness for open or short between throttle motor relay and ECM

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

3.

CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect IPDM E/R harness connector E12.

4.

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

5.

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

Is the inspection result normal?

YES

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F123, E6
• Harness for open or short between throttle motor relay and ECM

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

5.

CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT-II

1.

Reconnect ECM and IPDM E/R harness connectors.

2.

Turn ignition switch ON.

3.

Check voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 6.

6.

CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II

1.

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

ECM

Ground

Voltage

Connector

Terminal

F7

15

Ground

Battery voltage

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F7

15

E12

25

Existed

ECM

Ground

Voltage

Connector

Terminal

F7

2

Ground

Battery voltage

P1124, P1126 THROTTLE CONTROL MOTOR RELAY

EC-225

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

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2.

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

Is the inspection result normal?

YES

>> GO TO 8.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F12, E9
• Harness for open or short between throttle motor relay and ECM

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

8.

CHECK FUSE

1.

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

2.

Check 15A fuse for blown.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace 15A fuse.

9.

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.

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F7

2

E12

32

Existed

EC-226

< COMPONENT DIAGNOSIS >

[HR16DE (WITH EURO-OBD)]

P1128 THROTTLE CONTROL MOTOR

P1128 THROTTLE CONTROL MOTOR

Description

INFOID:0000000001056453

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:0000000001056454

DTC DETECTION 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.

>> 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-226, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001056455

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection E21. Refer to Ground Inspection in 

GI-41, "Circuit Inspection"

. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect electric throttle control actuator harness connector.

2.

Disconnect ECM harness connector.

3.

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

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1128

Throttle control motor 
circuit short

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

• Harness or connectors

(Throttle control motor circuit is shorted.)

• Electric throttle control actuator

(Throttle control motor)

Electric throttle control actuator

ECM

Continuity

Connector

Terminal

Connector

Terminal

F29

5

F7

1

Not existed

4

Existed

6

1

Existed

4

Not existed