Description
The ECM receives two vehicle speed sensor 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 EC, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description" for ASCD functions.
DTC DETECTION LOGIC
NOTE:
DTC No. | Trouble diagnosis (Trouble diagnosis content) | DTC detecting condition | Possible cause |
P1574 | ASCD VHL SPD SEN (ASCD vehicle speed sensor) | ECM detects a difference between two vehicle speed signals is out of the specified range. |
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DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
CAUTION: Always drive vehicle at a safe speed.
NOTE: This procedure 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.
3. Check DTC.
Is DTC detected?
YES >> Proceed to EC, "Diagnosis Procedure".
NO >> INSPECTION END
1.CHECK DTC WITH TCM
Check DTC with TCM. Refer to TM, "CONSULT Function" (A/T models) or TM, "CONSULT Function" (CVT models).
Is DTC detected?
NO >> GO TO 2.
YES >> Perform trouble shooting relevant to DTC indicated.
2.CHECK DTC WITH "ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)"
Check DTC with ABS actuator and electric unit (control unit). Refer to BRC, "CONSULT Function (ABS)".
Is DTC detected?
NO >> INSPECTION END
YES >> Perform trouble shooting relevant to DTC indicated.
Description ECM receives input speed sensor signal from TCM via the CAN communication line. ECM uses this signal for engine control. DTC Logic DTC DETECTION LOGIC NOTE: If DTC P1715 is disp ...
Vehicle Dynamic Control (VDC) system (if so equipped)
The VDC system uses various sensors to monitor
driver inputs and vehicle motion. Under certain
driving conditions, the VDC System helps to perform
the following functions:
Controls brake pressure to reduce wheel
slip on one slipping drive wheel so power is
transferred to a non slipping drive w ...
P0979 Shift solenoid C
DTC Logic
DTC DETECTION LOGIC
DTC
Trouble diagnosis name
DTC detection condition
Possible causes
P0979
Shift Solenoid C Control Circuit
Low
The following diagnosis conditions
are met, and the current
monitor reading of the TCM 2-4
brake solenoid valve is ...