DTC P0873:00 [TCM (EW6A-EL)]

id0502p7904800

Note

• Oil pressure switch No.3 is built into oil pressure switch A.

• If there is a malfunction in oil pressure switch No.3, replace oil pressure switch A.

DTC P0873:00

Oil pressure switch No.3 (Oil pressure switch A) stuck off

DETECTION CONDITION

•  Under the following conditions, oil pressure switch No.3 stuck-off detected by combination of gear ratio malfunction and oil pressure switch pattern malfunction:

―  Engine is running.

―  ATF temperature is 20 °C {68 °F} or more.

―  There is no difference between vehicle speed signal from DSC HU/CM and output shaft speed sensor signal.

―  Turbine/input shaft speed sensor and output shaft speed sensor DTC is not recorded.

FAIL-SAFE FUNCTION

•  Inhibits malfunctioning gear.

•  Limits engine torque.

•  Inhibits learning control.

•  Inhibits manual mode.

•  Inhibits neutral idle control.

•  Inhibits i-stop control.

•  Inhibits AAS.

POSSIBLE CAUSE

•  ATF is less than specified value

•  Oil pressure switch No.3 malfunction

SYSTEM WIRING DIAGRAM

Not applicable

DTC P0873:00	Oil pressure switch No.3 (Oil pressure switch A) stuck off
DETECTION CONDITION	• Under the following conditions, oil pressure switch No.3 stuck-off detected by combination of gear ratio malfunction and oil pressure switch pattern malfunction: ― Engine is running. ― ATF temperature is 20 °C {68 °F} or more. ― There is no difference between vehicle speed signal from DSC HU/CM and output shaft speed sensor signal. ― Turbine/input shaft speed sensor and output shaft speed sensor DTC is not recorded.
FAIL-SAFE FUNCTION	• Inhibits malfunctioning gear. • Limits engine torque. • Inhibits learning control. • Inhibits manual mode. • Inhibits neutral idle control. • Inhibits i-stop control. • Inhibits AAS.
POSSIBLE CAUSE	• ATF is less than specified value • Oil pressure switch No.3 malfunction
SYSTEM WIRING DIAGRAM	Not applicable

Diagnostic procedure

STEP	INSPECTION		ACTION
1	VERIFY DTC OUTPUT STATUS • Is the DTC P1738:00 also present?	Yes	Go to the applicable DTC inspection. (See DTC P1738:00 [TCM (EW6A-EL)].)
1		No	Go to the next step.
2	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture of the PC function. • Record the freeze frame data/snap shot data.	—	Go to the next step.
3	VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
3		No	Go to the next step.
4	VERIFY THAT DTC IS PRESENT • Clear the DTC using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (EW6A-EL)].) • Perform the following procedure to ensure that the DTC has been resolved: 1. Start the engine. 2. Verify that the ATF temperature is 20 °C {68 °F} or more. • Perform the DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [TCM (EW6A-EL)].) • Is the DTC P0848:00 or P0873:00 present?	Yes	Go to the next step.
4		No	DTC troubleshooting completed.
5	INSPECT ATF LEVEL • Inspect the ATF level. (See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [EW6A-EL].) • Is there any malfunction?	Yes	Adjust the ATF level to the specification, then go to Step 7. (See AUTOMATIC TRANSAXLE FLUID (ATF) ADJUSTMENT [EW6A-EL].)
5		No	DTC P0848:00 and P0873:00 are displayed in Step 4: • Refer to the wiring diagram and verify whether or not there is a common connector between TCM and oil pressure switch A. If there is a common connector: ― Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a malfunction. ― Repair or replace the malfunctioning part. If there is no common connector: ― Repair or replace the wiring harness. • Go to Step 7. Only DTC P0873:00 is displayed in Step 4: • Go to the next step.
6	INSPECT OIL PRESSURE SWITCH A CONNECTOR AND OIL PRESSURE SWITCH NO.3 CIRCUIT • Visually inspect for poor connection and open circuit. • Is there any malfunction?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between TCM and oil pressure switch A. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a malfunction. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness. Go to the next step.
6		No	Replace the oil pressure switch A, then go to the next step. (See OIL PRESSURE SWITCH REMOVAL/INSTALLATION [EW6A-EL].)
7	PERFORM ON-BOARD DIAGNOSTIC TEST • Perform the following procedure to ensure that the DTC has been resolved: 1. Start the engine. 2. Verify that the ATF temperature is 55 °C {131 °F} or more. • Perform the on-board diagnostic test. (See ON-BOARD DIAGNOSTIC TEST MODE [TCM (EW6A-EL)].) • Are any DTCs present?	Yes	ATF amount in Step 5 is correct • Replace the automatic transaxle, then drive the vehicle to check it, and if there is no problem then the DTC troubleshooting is complete. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [EW6A-EL].) ATF amount adjusted in Step 5: • Replace the control valve body, then go to the next step. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [EW6A-EL].)
7		No	Drive the vehicle to check it, and if there is no problem then the DTC troubleshooting is complete.
8	RE-PERFORM ON-BOARD DIAGNOSTIC TEST • Perform the following procedure to ensure that the DTC has been resolved: 1. Start the engine. 2. Verify that the ATF temperature is 55 °C {131 °F} or more. • Perform the on-board diagnostic test. (See ON-BOARD DIAGNOSTIC TEST MODE [TCM (EW6A-EL)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (EW6A-EL)].)
8		No	DTC troubleshooting completed.