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4. DETECT MALFUNCTIONING PART • Check the following: With EOBD (1.6L and 1.8L) − Fuse 25, fuse 12, fuse 27, fuse 24 2 sensor and fuse Without EOBD (1.6L) − Fuse 23, fuse 12, fuse 27, fuse 22, fuse 25 2 sensor and fuse Without EOBD (1.8L) − Fuse 22, fuse 25, fuse 12, fuse 27, fuse 24 2 sensor and fuse • Repair or replace if necessary. • With the X-431 scan tool, read ECM DTCs. • Refer to ⬙DTC Confirmation Procedure⬙. Is DTC P0031 still present? Yes >> Go to the next step. No >> The system is now operating properly. 5. CHECK O 2 SENSOR HEATER CONTROL CIRCUIT FOR OPEN OR SHORT • Turn ignition switch off. • Disconnect ECM connector. • Check harness continuity between ECM terminal and O 2 sensor terminal. • Continuity should exist. • Check sensor heater control circuit. O 2 SENSOR TERMINAL ECM Oxygen sensor Upstream O 2 sensor heater • 48 (With EOBD) • 1 (Without EOBD) 1 • c Check harness short to ground. Is the check result normal? Yes >> Go to the next step. No >> Repair or replace the circuit for an open or short in harness or connectors. DIAGNOSIS & TESTING 03
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