|
|
EC-250 [QG (WITH EURO-OBD)] DTC P0138 HO2S2 (M/T MODELS) Specification data are reference values and are measured between each terminal and ground. CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam- Diagnostic Procedure EBS00QKU 1. RETIGHTEN GROUND SCREWS 1. Turn ignition switch “OFF”. 2. Loosen and retighten engine ground screws. >> GO TO 2. 2. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Disconnect heated oxygen sensor 2 harness connector. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 74 and HO2S2 4. Also check harness for short to ground and short to power. OK or NG OK >> GO TO 3. NG >> Repair open circuit or short to ground or short to power in harness or connectors. TER- MINAL NO. WIRE COLOR ITEM CONDITION DATA (DC Voltage) 16 W Heated oxygen sensor 2 [Engine is running] ● Warm-up condition ● Engine speed is 3,000 rpm quickly after the fol- – Keeping the engine speed between 3,500 and 0 - Approximately 1.0V 74 B Sensors' ground [Engine is running] ● Idle speed Approximately 0V MBIB0095E Continuity should exist. MBIB0256E |