Infiniti M45 (Y34). Manual — part 439
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-445
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EC
2.
CHECK THROTTLE CONTROL MOTOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check harness continuity between ECM terminal 153 and ground.
Refer to Wiring Diagram.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to power in harness or connectors.
3.
CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY
1.
Disconnect throttle control motor relay harness connector.
2.
Check voltage between throttle control motor relay terminals 2, 5
and ground with CONSULT-II or tester.
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 battery
>> Repair or replace harness or connectors.
5.
CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check continuity between ECM terminal 157 and throttle control motor relay terminal 3.
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.
Continuity should exist.
PBIB1112E
Voltage: Battery voltage
PBIB0575E
Continuity should exist.
EC-446
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
6.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F33, E33
●
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 F34, E34
●
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-447, "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.
Disconnect electric throttle control actuator harness connector.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between the following terminals.
Refer to Wiring Diagram.
4.
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
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-447
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EC
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-447, "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-44, "Accelerator Pedal Released Position Learning"
3.
Perform
EC-44, "Throttle Valve Closed Position Learning"
4.
Perform
EC-44, "Idle Air Volume Learning"
>> INSPECTION END
Component Inspection
ABS002NL
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.
PBIB0083E
Conditions
Continuity
12V direct current supply between terminals
1 and 2
Yes
No current supply
No
PBIB0098E
EC-448
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
THROTTLE CONTROL MOTOR
1.
Disconnect electric throttle control actuator harness connector.
2.
Check resistance between terminals 3 and 6.
3.
If NG, replace electric throttle control actuator and go to next
step.
4.
Perform
EC-44, "Accelerator Pedal Released Position Learning"
5.
Perform
EC-44, "Throttle Valve Closed Position Learning"
6.
Perform
EC-44, "Idle Air Volume Learning"
Remove and Installation
ABS002NM
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to
Resistance: Approximately 1 - 15
Ω
[at 25
°
C (77
°
F)]
PBIB0095E
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