P1574 ASCD VEHICLE SPEED SENSOR

VR38

P1574

Description
DTC Logic
Diagnosis Procedure

Description

The ECM receives two vehicle speed signals via CAN communication line. One is sent from combination meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD control. Refer to System Description (GT-R certified NISSAN dealer) for ASCD functions.

DTC Logic

DTC DETECTION LOGIC

NOTE：

If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000, U1001. Refer to DTC Logic (GT-R certified NISSAN dealer).
If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to DTC Logic (GT-R certified NISSAN dealer).
If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer to DTC Logic (GT-R certified NISSAN dealer).
If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to DTC Logic (GT-R certified NISSAN dealer).

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible cause
P1574	ASCD vehicle speed sensor	The difference between the two vehicle speed signals is out of the specified range.	Harness or connectors (The CAN communication line is open or shorted.) Combination meter ABS actuator and electric unit (control unit) Wheel sensor TCM ECM

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

2.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure

1.CHECK DTC WITH TCM

2.CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

3.CHECK DTC WITH “COMBINATION METER”