2003 NISSAN ALMERA N16 ecm

EC-276
[QG (WITH EURO-OBD)]
DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR
DTC P1121 ELECTRIC THROTTLE CONTROL ACTUATOR
PFP:16119
Component DescriptionEBS00K9O
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 throttle position sensor detects the throttle valve position, and the opening and closing speed of the throt-
tle valve and feeds the voltage signals to the ECM. The ECM judges the current opening angle of the throttle
valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening
angle properly in response to driving condition.
On Board Diagnosis LogicEBS00K9P
FAIL-SAFE MODE
When the malfunction A or B is detected in the two consecutive trips, the ECM enters fail-safe mode and MI
lights up.
When the malfunction C is detected even in the 1st trip, the ECM enters fail-safe mode and the MI lights up
DTC Confirmation ProcedureEBS00K9Q
NOTE:
●Perform “PROCEDURE FOR MALFUNCTION A AND B” first. If the 1st trip DTC cannot be con-
firmed, perform “PROCEDURE FOR MALFUNCTION C”.
●If there is no malfunction on “PROCEDURE FOR MALFUNCTION A AND B”, perform “PROCEDURE
FOR MALFUNCTION C”.
●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 MALFUNCTION A AND B
With CONSULT-II
1. Turn ignition witch “ON” and wait at least 1 second.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Shift selector lever to “D” position (A/T), “1st” position (M/T) and
wait at least 2 seconds.
4. Turn ignition switch “OFF”, wait at least 10 seconds, and then
turn “ON”.
5. If 1st trip DTC is detected, go to EC-277, "
Diagnostic Procedure"
.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1121
1121Electric throttle control
actuatorA)Electric throttle control actuator does not function
properly due to the return spring malfunction.
●Electric throttle control actuator B)Throttle valve opening angle in fail-safe mode is
not in specified range.
C)ECM detect the throttle valve is stuck open.
This self-diagnosis has the one trip detection
logic.
Detected items Engine operating condition in fail-safe mode
Malfunction AThe ECM controls the electric throttle actuator by regulating the throttle opening around the idle position.
The engine speed will not rise more than 2,000 rpm.
Malfunction B ECM controls the electric throttle control actuator by regulating the throttle opening to 20 degrees or less.
Malfunction CWhile the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls.
The engine can restart in “N” or “P” position, and engine speed will not exceed 1,000 rpm or more.
SEF058Y

EC-278
[QG (WITH EURO-OBD)]
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
PFP:16119
DescriptionEBS00K9T
NOTE:
If DTC P1122 is displayed with DTC P1121 or 1126, first perform the trouble diagnosis for DTC P1121 or
P1126. Refer to EC-276
or EC-285 .
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.
On Board Diagnosis LogicEBS00K9U
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 MI lights up.
DTC Confirmation ProcedureEBS00K9V
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-280, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1122
1122Electric throttle control
performance problemElectric throttle control function does
not operate properly.
●Harness or connectors
(Throttle control motor circuit is open or shorted.)
●Harness or connectors
(Throttle control motor relay circuit is open or
shorted.)
●Electric throttle control actuator
●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

EC-280
[QG (WITH EURO-OBD)]
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic ProcedureEBS00K9X
1. RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
>> GO TO 2.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
3RThrottle control motor
power supply[Ignition switch “ON”]BATTERY VOLTAGE
(11 - 14V)
4W (LHD
models)
BR
(RHD
models)Throttle control motor
(Close)[Ignition switch “ON”]
●Engine stopped.
●Shift lever position is “D” (A/T models).
●Shift lever position is “1st” (M/T models).
●Accelerator pedal is releasing.0 - 14V
5B (LHD
models)
Y (RHD
models)Throttle control motor
(Open)[Ignition switch “ON”]
●Engine stopped.
●Shift lever position is “D” (A/T models).
●Shift lever position is “1st” (M/T models).
●Accelerator pedal is depressing.0 - 14V
104 OR Throttle control motor relay[Ignition switch “OFF”]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch “ON”]0 - 1.0V
PBIB0534E
PBIB0533E
MBIB0095E

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-281
[QG (WITH EURO-OBD)]
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EC
2.CHECK THROTTLE CONTROL MOTOR RELAY SIGNAL CIRCUIT
Check voltage between ECM terminal 3 and ground under the fol-
lowing conditions with CONSULT-II or tester.
OK or NG
OK >> GO TO 10.
NG >> GO TO 3.
3.CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect throttle control motor relay.
3. Check voltage between throttle control motor relay terminals 2, 5
and ground.
OK or NG
OK >> GO TO 5.
NG >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
●15A fuse
●Harness for open or short between throttle control motor relay and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
Ignition switch Voltage
OFF Approximately 0V
ONBattery voltage
(11 - 14V)
MBIB0028E
MBIB0248E
Voltage: Battery voltage
PBIB0575E

EC-282
[QG (WITH EURO-OBD)]
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
5. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 3 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 7.
NG >> GO TO 6.
6. DETECT MALFUNCTIONING PART
Check the following.
●Harness connectors E225, F43
●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
1. Check continuity between ECM terminal 104 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 E75, F36
●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-284, "
Component Inspection" .
OK or NG
OK >> GO TO 13.
NG >> Replace throttle control motor relay.Continuity should exist.
Continuity should exist.

DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-283
[QG (WITH EURO-OBD)]
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EC
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 open circuit or short to ground or short to power in harness or connectors.
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-284, "
Component Inspection" .
OK or NG
OK >> GO TO 13.
NG >> GO TO 14.
13.CHECK INTERMITTENT INCIDENT
Refer to EC-109, "
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-31, "
Throttle Valve Closed Position Learning" .
3. Perform EC-31, "
Idle Air Volume Learning" .
>>INSPECTION END
Electric throttle control
actuator terminalECM terminal Continuity
34 Should exist
5 Should not exist
64 Should not exist
5 Should exist
MBIB0254E
MBIB0107E

DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
EC-285
[QG (WITH EURO-OBD)]
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EC
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAYPFP:16119
Component DescriptionEBS00KA0
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 ModeEBS00KA1
Specification data are reference values.
On Board Diagnosis LogicEBS00KA2
These self-diagnoses have the one trip detection logic.
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MI lights up.
DTC Confirmation ProcedureEBS00KA3
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 10V at idle.
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-288, "
Diagnostic Procedure" .
MONITOR ITEM CONDITION SPECIFICATION
THRTL RELAY
●Ignition switch: ON ON
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1124
11 2 4Throttle control motor
relay circuit shortECM detect the throttle control motor relay
is stuck ON.
●Harness or connectors
(Throttle control motor relay circuit is shorted.)
●Throttle control motor relay
P1126
11 2 6Throttle control motor
relay circuit openECM 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

EC-288
[QG (WITH EURO-OBD)]
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic ProcedureEBS00KA5
1. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect throttle control motor relay.
3. Check voltage between throttle control motor relay terminals 2, 5
and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. DETECT MALFUNCTIONING PART
Check the following.
●15A fuse
●Harness for open or short between throttle control motor relay and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
3RThrottle control motor
power supply[Ignition switch “ON”]BATTERY VOLTAGE
(11 - 14V)
104 OR Throttle control motor relay[Ignition switch “OFF”]BATTERY VOLTAGE
(11 - 14V)
[Ignition switch “ON”]0 - 1.0V
MBIB0248E
Voltage: Battery voltage
PBIB0575E