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4. CHECK THE O 2 SENSOR GROUND CIRCUIT FOR AN OPEN OR SHORT • Disconnect ECM harness connector. • Check harness continuity between upstream O 2 sensor terminal 1 in connector E-074 and ECM terminal 76 in connector E-054. • Check harness continuity between downstream O 2 sensor terminal 1 in connector B-011 and ground. • Continuity should exist. • Check harness for a short to power and short to ground. Is the check result normal? Yes >> Go to the next step. No >> Repair the circuits for an open or short to power or short to ground in harness or connectors. 5. CHECK THE O 2 SENSOR INPUT SIGNAL CIRCUIT FOR AN OPEN OR SHORT • Check harness continuity between ECM terminal and O 2 sensor terminal as follows. • Continuity should exist. • Check harness continuity between following terminals and ground. • Continuity should not exist. COMPONENT ECM TERMINAL O 2 SENSOR TERMINAL Upstream O 2 sensor 60 4 Downstream O 2 sensor 59 4 • Also Check harness short to power supply circuit. Is the check result normal? Yes >> Go to the next step. No >> Repair circuit for an open or short to power or short to ground in harness or connectors. 6. CHECK O 2 SENSOR POWER SUPPLY • Turn ignition switch on. • Check power supply between O 2 sensor E-074, ter- minal 2 and ground. • Battery voltage should exist. Is the check result normal? Yes >> Go to step 8. No >> Go to the next step. DIAGNOSIS & TESTING LTSMD030002 03
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