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1A-73 Engine General Information and Diagnosis: DTC P0101: Mass Air Flow Circuit Range / Performance S5JB0A1104017 Wiring Diagram 10 HO2S heater control circuit check 1) Disconnect connector from ECM with ignition switch turned OFF. 2) Check for proper connection of HO2S-2 heater circuit terminal to ECM connector. 3) If connection are OK, measure wire resistance of sensor heater control circuit at ECM connector between ECM to Is measured wire resistance lower than 1 Ω ? Go to Step 11. Repair or replace 11 HO2S-2 heater circuit check 1) Measure insulation resistance between control terminal of HO2S-2 heater at ECM connector and vehicle body Is measured resistance infinity? Substitute a known Repair or replace short Step Action Yes No E23 C37 3 4 18 19 5 6 7 10 11 17 20 47 46 49 50 51 21 22 52 16 25 9 24 14 55 57 54 53 59 60 58 2 26 27 28 15 56 48 32 31 34 35 36 37 40 42 39 38 44 45 43 41 33 1 12 13 23 8 3 4 18 19 5 6 7 10 11 17 20 47 46 49 50 51 21 22 52 16 25 9 24 14 55 57 54 53 59 60 58 2 26 27 28 15 56 48 32 31 34 35 36 37 40 42 39 38 44 45 43 41 33 1 12 13 23 8 BLK/WHT BLU/BLK BLU/BLK WHT/GRN BLK/RED BLK/RED BLK/RED BLK/YEL BLU 12V 5V 5V 2 3 4 E23-29 E23-1 E23-60 BLU/BLK E23-16 LT GRN GRY/GRN GRY/GRN 1 BLU/BLK C37-25 C37-57 5 BLU RED C37-26 C37-27 C37-15 C37-29 BLK/ORN C37-58 C37-30 BLK/ORN BLK/YEL I5JB0A110033-01 1. MAF and IAT sensor 3. Main relay 5. To other sensors 2. Ignition switch 4. ECM |