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1A-209 Engine General Information and Diagnosis: 5 Wire harness check connector and engine ground with ignition switch turned Is voltage 0 V? Substitute a known- “WHT” wire is shorted to 6 Wire harness check throttle body assembly connector and engine ground, Is each voltage 4 – 6 V? Go to Step 9. Go to Step 7. 7 Wire harness check 54” and “C37-40” terminals. 4) If OK, measure voltage between “C37-54” terminal of ECM connector and engine ground, between “C37-40” Is each voltage 0 V? Go to Step 8. “BLK” wire or “RED” 8 Wire harness check electric throttle body assembly connector and engine Is each resistance infinity? Substitute a known- “BLK” wire or “RED” 9 Electric throttle body assembly check Position Sensor Performance Check” under “Electric Is each output voltage within specified value? Substitute a known- Replace electric throttle Step Action Yes No |