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. 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.
NO: Intermittent malfunction.