P0974
DTC P0974: Shift Select Solenoid 1 System (Short to power supply)
CAUTION:
- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
DIAGNOSTIC FUNCTION
TC-SST-ECU checks that the shift select solenoid 1 circuit is normal.
DESCRIPTIONS OF MONITOR METHODS
The shift select solenoid 1 circuit is determined to be short to power supply.
MONITOR EXECUTION
- Continuous
MONITOR EXECUTION CONDITIONS (OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
- Not applicable
Sensor (The sensor below is determined to be normal)
- Not applicable
LOGIC FLOW CHARTS (Monitor Sequence)
DTC SET CONDITIONS
Check Conditions
- Voltage of battery: 8 V or more.
- Voltage of battery: 16.5 V or less.
- Shift select solenoid 1: OFF.
JUDGMENT CRITERIA
- FET (Field Effect Transistor) output: (Battery voltage - 2 V) or more. (160 millisecond)
OBD-II DRIVE CYCLE PATTERN
The FET channel output remains (Battery voltage - 2 V) or less for 160 milliseconds.
PROBABLE CAUSES
- Malfunction of TC-SST-ECU
- Malfunction of shift select solenoid 1
DIAGNOSTIC PROCEDURE
Required Special Tools:
- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A
STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q. Is the check result normal?
YES Go to Step 2.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart.) After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.
After 5 or more seconds have passed with the ignition switch ON position, check that the DTC is reset.
Q. Is DTC No. P0974 set?
YES Replace the transaxle assembly. (Refer to Removal and Replacement.)
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)