toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Engine Controls - MIL ON/DTC P0420 Set|Page 3154 > < Engine Controls - MIL ON/DTC P0420 Set|Page 3152
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2.

Connect the Diagnostic Tester to the vehicle and select ~CURRENT ECU CAL" from the ECU REPROGRAM MAIN MENU." To determine the
vehicle's current ECM (PCM) calibration, see Figure 1 below.

3.

Remove the 10A ECU-IG fuse from the instrument panel Junction Block (refer to Figure 2 for location). This action prevents possible activation
of the ABS relay, resulting in ECM Reprogramming failure.

NOTE:

ECU damage may occur if the 1OA fuse is NOT removed.

Engine Controls - MIL ON/DTC P0420 Set|Page 3154 > < Engine Controls - MIL ON/DTC P0420 Set|Page 3152