Infiniti I35 (A33). Manual - part 322
Component Description
NHEC1469
ECM receives vehicle speed signals via two different lines, and
detects vehicle speed for ASCD control.
Vehicle speed signals are input from combination meter and TCM
separately.
Signal from TCM is sent via CAN communication line.
Refer to EC-54 for ASCD functions.
On Board Diagnosis Procedure
NHEC1470
This self-diagnosis has the one trip diagnosis logic.
The MIL will not light up for this self-diagnosis.
NOTE:
I
If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC
U1000, U1001, refer to EC-162.
I
If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
to EC-429.
I
If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-442.
DTC
Trouble diagnosis name
DTC Detecting Condition
Possible cause
P1574
1574
ASCD vehicle speed sensor
ECM detects a difference values
between two vehicle speed signals if
they are out of the specified range.
I
Harness or connectors
(The CAN communication line is
open or shorted.)
I
Harness or connectors
(The combination meter circuit is
open or shorted.)
I
Combination meter
I
Vehicle speed sensor
I
TCM
I
ECM
DTC Confirmation Procedure
NHEC1471
CAUTION:
Always drive vehicle at a safe speed.
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.
TESTING CONDITION:
Step 3 may be conducted with the drive wheels lifted in the
shop or by driving the vehicle. If a road test is expected to be
easier, it is unnecessary to lift the vehicle.
SEF058Y
With CONSULT-II
1)
Start engine (TCS switch or VDC switch OFF).
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Drive the vehicle at more than 40 km/h (25 MPH).
4)
If DTC is detected, go to “Diagnostic Procedure”, EC-632.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1574 ASCD VEHICLE SPEED SENSOR
Component Description
EC-629