DTC P2728 / P2729 / P2730

Precautions: Precautions for Diagnosing Trouble · Precautions for Disassembly and Reassembly · Precautions for Transmission / Transaxle · General safety (00)

DTC Detecting Condition and Trouble Area

DTC detecting condition	Trouble area
P2728: Pressure Control Solenoid “E” Control Circuit Range / Performance Difference between measured circuit current of line pressure control solenoid valve and commanded circuit current is higher than specified value. (1 D/C detection logic)	•Line pressure control solenoid valve •Solenoid harness with ATF temperature sensor •TCM
P2729: Pressure Control Solenoid “E” Control Circuit Low Line pressure control solenoid valve drive circuit is open or shorted to ground. (1 D/C detection logic)
P2730: Pressure Control Solenoid “E” Control Circuit High Line pressure control solenoid valve drive circuit is shorted to power supply. (1 D/C detection logic)

Circuit Diagram

[A]:	Solenoid harness connector (View: [a])	A2:	Line pressure control solenoid valve ground circuit	3.	A/T
[B]:	Line pressure control solenoid valve connector (View: [a])	1.	TCM	4.	Line pressure control solenoid valve
A1:	Line pressure control solenoid valve drive circuit	2.	CPU

DTC Confirmation Procedure

WARNING:

If you do not select a suitable route and take proper precautions when performing a road test, an accident can occur.

•Select a level road with no traffic to minimize the risk of accident.
•Perform the test extremely carefully.
•Perform the road test using 2 persons, a driver and a tester.

NOTE:

Check that the following condition is met in this “DTC Confirmation Procedure”.

•DTC U0073 or U0100 is not detected.

1)Warm up engine to normal operating temperature.

2)Drive vehicle at approx. 50 km/h (31 mile/h) or more in D range for 1 minute 5 times.

DTC Troubleshooting

Step	Action	Yes	No
1	Was “A/T Control System Check” performed?	Go to Step 2.	Go to A/T Control System Check.
2	Line pressure control solenoid valve and solenoid harness check 1)Check line pressure control solenoid valve and solenoid harness. Is check result OK?	Check for intermittent trouble.	Go to Step 3.
3	Solenoid harness check 1)Remove transaxle side oil pan. 2)Disconnect line pressure control solenoid valve connector. 3)Check for proper terminal connections to solenoid harness connector and line pressure control solenoid valve connector. 4)If connections are OK, check the following points. •Resistance of “A1” and “A2” circuits: less than 1 Ω •Resistance between each of “A1” and “A2” circuits and ground: infinity •Resistance between “A1” circuit terminal and other terminal at solenoid harness connector: infinity •Resistance between “A2” circuit terminal and other terminal at solenoid harness connector: infinity •Voltage of “A1” and “A2” circuits: approx. 0 V (When ignition is “ON”) Is check result OK?	Go to Step 4.	Replace solenoid harness with ATF temperature sensor.
4	Line pressure control solenoid valve check 1)Check line pressure control solenoid valve. Is check result OK?	Substitute a known-good TCM and recheck DTC.	Replace valve body assembly.