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P0159-O2 SENSOR 2/2 SLOW RESPONSE (CONTINUED) 3. (K243) O2 2/2 SIGNAL CIRCUIT Turn the ignition off Disconnect the 2/2 O2 Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K243) O2 2/2 Signal circuit in the O2 Is the voltage between 4.5 and 5.0 volts? Yes >> Go To 4 No >> Check the (K243) O2 2/2 Signal circuit for a short to ground, open, or short to voltage. If OK, replace and pro- Perform the POWERTRAIN VERIFICATION TEST. (Refer 4. (K904) O2 RETURN DOWNSTREAM CIRCUIT Measure the voltage on the (K904) O2 Return Downstream circuit in Is the voltage at 2.5 volts? Yes >> Go To 5 No >> Check the (K904) O2 Return Downstream circuit for a short to ground, open, or short to voltage. If OK, replace Perform the POWERTRAIN VERIFICATION TEST. (Refer 9 - 222 ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L DR/DH |