DTC 81: Central Processing Unit (CPU) Diagnosis, and ROM/RAM Diagnosis Clear the DTC (see page 19-90). Test-drive the vehicle. Does the ABS indicator come on and is DTC 81 indicated? YES - Replace the ABS modulator-control unit. NO - Intermittent failure; the vehicle is OK at this time.

ABS indicator does not come on Turn the ignition switch ON (II) and watch the ABS indicator. Does the ABS indicator come on? YES - The system is OK at this time. NO - Go to step 2. Turn the ignition switch OFF then ON (II) again. Does the brake system indicator come on? YES - Go to step 3. NO - Repair open in the indicator power source circuit. Blown No. 10 (7.5 A) fuse. Open in the wire between the No. 10 (7.5 A) fuse and the gauge assembly. Open circuit inside the fuse box. Turn the ignition switch OFF. Disconnect the ABS control unit 25P connector. Turn the ignition switch ON (II). Does the ABS indicator come on? YES - Check for loose terminals in the ABS control unit 25P connector. If necessary, substitute a known-good ABS modulator-control unit and recheck. NO - Go to step 6. Turn the ignition switch OFF. Remove the gauge assembly (see page 22-93). Check the ABS indicator bulb in the gauge assembly. Is the bulb OK? YES - Go to step 9. NO - Replace the ABS indicator bulb.