P1875

DTC P1875: Damper Speed Sensor System (Poor performance)

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 damper (closer to the engine than input shaft) is normal.

DESCRIPTIONS OF MONITOR METHODS

The damper speed sensor is determined to be abnormal.

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)

- P0715: Input shaft 1 (odd number gear axle) speed sensor system (Output high range out)
- P0716: Input shaft 1 (odd number gear axle) speed sensor system (Poor performance)
- P0717: Input shaft 1 (odd number gear axle) speed sensor system (Output low range out)
- P2766: Input shaft 2 (even number gear axle) speed sensor system (Poor performance)
Sensor (The sensor below is determined to be normal)

- Input shaft 1 (odd number gear axle) speed sensor
- Input shaft 2 (even number gear axle) speed sensor

LOGIC FLOW CHARTS (Monitor Sequence)





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.
- Engine speed: 650 r/min or more.
- Time since above engine condition: 1.5 seconds.
JUDGMENT CRITERIA

- Sensor output speed: 16,000 r/min or more. (400 millisecond)
- The absolute value of the "Engine speed via CAN" - "Sensor output speed" remains 500 r/min or more. (500 millisecond)

OBD-II DRIVE CYCLE PATTERN

- The output of the sensor remains 16,000 r/min or less for 400 millisecond.
- The absolute value of the "Engine speed via CAN" - "Sensor output speed" remains 500 r/min or less for 500 millisecond.

PROBABLE CAUSES

- Malfunction of damper speed sensor
- Malfunction of TC-SST-ECU

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.

With the vehicle stopped, hold a specific accelerator pedal angle for 20 seconds, and check that the DTC is reset.

Q. Is DTC No.P1875 set?

YES Replace the transaxle assembly. (Refer to Removal and Replacement.)
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)