DTC 81-11, 81-51, 81-52: Central Processing Unit (CPU) Internal Circuit Malfunction; Central Processing Unit (CPU) Internal Circuit Malfunction; Central Processing Unit (CPU) Internal Circuit Malfunction

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. (See General Troubleshooting Information ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Test-drive the vehicle at 19 mph (30 km/h) or more.
NOTE: Drive the vehicle on a straight section of road, not on a lift.
Check for DTCs with the HDS.
Is DTC 81-11, 81-51, or 81-52 indicated?

YES - Check for loose terminals in the ABS modulator-control unit 25P connector. If the symptom/indication is still present, replace the ABS modulator-control unit (see ABS MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ).

NO - Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting (see INTERMITTENT FAILURES ).