Drive plate defective or transmission misassembled
Engine output low
Torque converter clutch piston defective
ATF pump worn or binding
Lock-up shift valve defective
Notes
Check the ATF level, and check the ATF cooler lines for leakage and loose connections. If necessary, clean the ATF cooler lines.
Improper alignment of ATF pump and torque converter housing may cause ATF pump seizure. The symptoms are mostly an rpm-related ticking noise or a high pitched squeak.
Inspect the ATF strainer for clogging with particles of steel or aluminum. If the ATF strainer is clogged, replace it, and clean the torque converter, cooler, and lines.
Check for a stored DTC, and check for loose connectors.
Inspect shift solenoid valve E for seizure, and the O-rings for wear and damage.
Check for a misinstalled/damaged drive plate.
Check that the idle rpm in gear is the specified idle speed;
R20A3 engine model,
K24Z3 engine model.
If the idle speed is correct, adjust the engine and the transmission mounts.