Test M: Engine Control System (Invalid/Faulted Data Received)

NOTE: DTC U2021 is set when torque reduction (engine condition) signal is normal and signal received by ABS CM indicates that PCM cannot execute torque reduction.

Check for PCM related DTCs. See SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION - 626 article in ENGINE PERFORMANCE. For PCM related DTCs, see DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 626 article in ENGINE PERFORMANCE. Repair as necessary.