Infiniti Q45 (FY33). Manual — part 205
SEF836U
SEF637U
SEF425U
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch “OFF”.
2. Disconnect throttle position switch har-
ness connector.
3. Turn ignition switch “ON”.
4. Check voltage between terminal
q
8
and
engine ground with CONSULT-II or
tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness connectors
F63
,
M49
I
10A fuse
I
Harness for open or
short between throttle
position switch and fuse
If NG, repair harness or
connectors.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM
terminal
q
74
and terminal
q
6
.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
E
NG
Repair harness or connec-
tors.
ADJUST THROTTLE POSITION SWITCH.
Perform BASIC INSPECTION, EC-91.
OK
CHECK COMPONENT
(Closed throttle position switch).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace throttle position
switch.
CHECK COMPONENT
(Throttle position sensor).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace throttle position
sensor.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0510
Closed Throttle Position Switch (Cont’d)
H
H
H
H
H
H
H
EC-349
SEF793W
SEF266Y
SEF947U
COMPONENT INSPECTION
Closed throttle position switch (Built in throttle
position sensor)
1.
Start engine and warm it up to normal operating temperature.
2.
Stop engine (Ignition switch “OFF”).
3.
Remove the vacuum hose connected to the throttle opener.
4.
Connect suitable vacuum hose to the vacuum pump and the
opener.
5.
Apply vacuum [more than −40.0 kPa (−300 mmHg, −11.81
inHg)] until the throttle drum becomes free from the rod of the
throttle opener.
6. Turn ignition switch “ON”.
7. Select “DATA MONITOR” mode with CONSULT-II.
8. Check indication of “CLSD THL/P SW”.
Measurement must be made with closed throttle position
switch installed in vehicle.
Throttle valve conditions
CLSD THL/P SW
Completely closed
ON
Partially open or completely open
OFF
If NG, adjust closed throttle position switch. Refer to “Basic
Inspection”, EC-91.
9. If it is impossible to adjust closed throttle position switch
in “Basic Inspection”, replace closed throttle position
switch.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
6. Disconnect closed throttle position switch harness con-
nector.
7. Check continuity between closed throttle position switch
terminals
q
6
and
q
8
.
Resistance measurement must be made with closed
throttle position switch installed in vehicle.
Throttle valve conditions
Continuity
Completely closed
Yes
Partially open or completely open
No
If NG, adjust closed throttle position switch. Refer to “Basic
Inspection”, EC-91.
8. If it is impossible to adjust closed throttle position switch
in “Basic Inspection”, replace closed throttle position
switch.
TROUBLE DIAGNOSIS FOR DTC P0510
Closed Throttle Position Switch (Cont’d)
EC-350
SEF793W
SEF266Y
SEF795W
Throttle position sensor
1.
Start engine and warm it up to normal operating temperature.
2.
Stop engine (Ignition switch “OFF”).
3.
Remove the vacuum hose connected to the throttle opener.
4.
Connect suitable vacuum hose to the vacuum pump and the
opener.
5.
Apply vacuum [more than −40.0 kPa (−300 mmHg, −11.81
inHg)] until the throttle drum becomes free from the rod of the
throttle opener.
6.
Turn ignition switch “ON”.
7. Select “DATA MONITOR” mode with CONSULT-II.
8. Check voltage of “THRTL POS SEN”.
Voltage measurement must be made with throttle posi-
tion sensor installed in vehicle.
Throttle valve conditions
THRTL POS SEN
Completely closed (a)
0.15 - 0.85
Partially open
Between (a) and (b)
Completely open (b)
3.5 - 4.7
If NG, adjust closed throttle position switch. Refer to “Basic
Inspection”, EC-91.
9. If it is impossible to adjust closed throttle position switch
in “Basic Inspection”, replace throttle position sensor.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
7. Check voltage between ECM terminal
q
63
(Throttle posi-
tion sensor signal) and ground.
Voltage measurement must be made with throttle posi-
tion sensor installed in vehicle.
Throttle valve conditions
Voltage (V)
Completely closed
0.15 - 0.85
Partially open
Between (a) and (b)
Completely open
3.5 - 4.7
If NG, adjust closed throttle position switch. Refer to “Basic
Inspection”, EC-91.
8. If it is impossible to adjust closed throttle position switch
in “Basic Inspection”, replace throttle position sensor.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0510
Closed Throttle Position Switch (Cont’d)
EC-351
A/T Communication Line (P0600) and A/T
Diagnostic Communication Line (P1605)
This circuit line (LAN) controls the smooth shifting up and down of
A/T during the hard acceleration/deceleration. Pulse signals are
exchanged between ECM and TCM (P0600).
This circuit line is also used to communicate malfunction informa-
tion related to A/T (Automatic Transmission) is transferred through
the line (LAN circuit) from TCM to ECM (P1605).
Be sure to erase the malfunction information such as DTC not
only in TCM but also ECM after the A/T related repair.
ON BOARD DIAGNOSIS LOGIC
Diagnostic Trouble
Code No.
Malfunction is detected when ...
Check Items
(Possible Cause)
P0600
0504
I
ECM receives incorrect voltage from TCM continu-
ously.
I
Harness or connectors
(The communication line circuit between ECM and
TCM is open or shorted.)
I
TCM
I
Dead (Weak) battery
P1605
0804
I
Signal from TCM is not sent to ECM.
SEF261Y
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
NOTE
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 10.5V.
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Start engine and let it idle for at least 2 seconds (P0600)
and 40 seconds (P1605).
4) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-354.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
TROUBLE DIAGNOSIS FOR DTC P0600, P1605
EC-352
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