Infiniti G37 Coupe. Manual — part 553
P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION
EC-393
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 3.
3.
CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Disconnect IPDM E/R harness connector E7.
4.
Check the continuity between IPDM E/R harness connector and ECM harness connector.
5.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E3, F1
• Harness connectors F104, F105
• Harness for open or short between ECM and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT-II
1.
Check the continuity between IPDM E/R harness connector and ECM harness connector.
2.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E3, F1
• Harness for open or short between ECM and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK FUSE
DTC
ECM
Ground
Condition
Voltage
Connector
Terminal
P1233
F102
52
Ground
Ignition switch OFF
Approx. 0V
Ignition switch ON
Battery voltage
P2101
F101
3
Ignition switch OFF
Approx. 0V
Ignition switch ON
Battery voltage
IPDM E/R
ECM
Continuity
Connector
Terminal
Connector
Terminal
E7
70
F101
25
Existed
DTC
IPDM E/R
ECM
Continuity
Connector
Terminal
Connector
Terminal
P1233
E7
54
F102
52
Existed
P2101
F101
3
EC-394
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION
1.
Disconnect 15A fuse (No. 51) from IPDM E/R.
2.
Check 15A fuse for blown.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace 15A fuse.
8.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace IPDM E/R.
NO
>> Repair or replace harness or connectors.
9.
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 the continuity between electric throttle control actuator harness connector and ECM harness con-
nector.
5.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair or replace.
10.
CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY
1.
Remove the intake air duct.
2.
Check if foreign matter is caught between the throttle valve (1)
and the housing.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Remove the foreign matter and clean the electric throttle
control actuator inside.
11.
CHECK THROTTLE CONTROL MOTOR
EC-395, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 13.
12.
CHECK INTERMITTENT INCIDENT
DTC
Electric throttle control actuator
ECM
Continuity
Bank
Connector
Terminal
Connector
Terminal
P1233
2
F27
5
F102
49
Existed
50
Not existed
6
49
Not existed
50
Existed
P2101
1
F6
1
F101
2
Existed
4
Not existed
2
2
Not existed
4
Existed
JMBIA0025ZZ
P1233, P2101 ELECTRIC THROTTLE CONTROL FUNCTION
EC-395
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
GI-38, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair or replace harness or connectors.
13.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1.
Replace malfunction electric throttle control actuator.
2.
Go to
EC-395, "Special Repair Requirement"
.
>> INSPECTION END
Component Inspection
INFOID:0000000001734204
1.
CHECK THROTTLE CONTROL MOTOR
1.
Turn ignition switch OFF.
2.
Disconnect electric throttle control actuator harness connector.
3.
Check resistance between electric throttle control actuator terminals as follows.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1.
Replace malfunctioning electric throttle control actuator.
2.
Go to
EC-395, "Special Repair Requirement"
.
>> INSPECTION END
Special Repair Requirement
INFOID:0000000001910849
1.
PERFORM THROTTLE VALVE CLOSED POSITION LEARNING
EC-18, "THROTTLE VALVE CLOSED POSITION LEARNING : Special Repair Requirement"
>> GO TO 2.
2.
PERFORM IDLE AIR VOLUME LEARNING
EC-19, "IDLE AIR VOLUME LEARNING : Special Repair Requirement"
>> END
Electric throttle control actuator
Resistance
Bank
Terminals
1
1 and 2
Approx. 1 - 15
Ω
[at 25
°
C (77
°
F)]
2
5 and 6
EC-396
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1236, P2118 THROTTLE CONTROL MOTOR
P1236, P2118 THROTTLE CONTROL MOTOR
Description
INFOID:0000000001734206
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:0000000001734207
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> 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
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001734208
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to Ground Inspection in
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
P1236
Throttle control motor
(bank 2) 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)
P2118
Throttle control motor
(bank 1) circuit short
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