P1868

AF23-5 AUTOMATIC TRANSAXLE

DTC P1868

Test 1-2:

Test 3-4:

Circuit Description with AF23-5 Automatic Transaxle
Transmission fluid life is determined by monitoring transmission fluid temperature over a period of time. The transmission control module (TCM) calculates transmission fluid life based on a set of temperature ranges stored in TCM memory. As the vehicle is driven, a counter increments. The rate at which the counter increments depends on the temperature range in which the transmission is currently operating. The higher the temperature range, the faster the counter increments. As the counts increment, the TCM will begin to decrease the fluid life percentage from 100, high fluid life, to 0, low fluid life.

If the TCM detects a calculated transmission oil life of 10 percent or less, then DTC P1868 sets. DTC P1868 is a type C DTC.

Conditions for Running the DTC
^ No Transmission Fluid Over temperature DTC P0218.
^ No TFT DTCs P0711, P0712, or P0713.
^ The system voltage is 8-18 volts.

Conditions for Setting the DTC
The calculated transmission oil life remaining is 10 percent or less.

Action Taken When the DTC Sets
^ The TCM does not request the ECM to illuminate the malfunction indicator lamp (MIL).
^ SERVICE VEHICLE displays on the driver information center (DIC),
^ The TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records.
^ The TCM stores DTC P1868 in TCM history.

Conditions for Clearing the DIC/DTC
^ The TCM clears the DIC when the condition no longer exits.
^ A scan tool can clear the DIC/DTC.
^ The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.
^ The TCM cancels the DTC default actions when the fault no longer exists and the DTC passes.

Diagnostic Aids
Inspect the transmission cooling system for possible blockage and restrictions.

Test Description
The number refers to the step number on the diagnostic table.
2. This step changes the AT fluid and filter. It is important to reset the oil life monitor after the fluid and filter are replaced.