Infiniti F50. Manual — part 450
DTC P1122 ELECTRIC THROTTLE CONTROL FUNCTION
EC-441
C
D
E
F
G
H
I
J
K
L
M
A
EC
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
EC-443
C
D
E
F
G
H
I
J
K
L
M
A
EC
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
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
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