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P0139-O2 SENSOR 1/2 SLOW RESPONSE (CONTINUED) 3. (K141) O2 1/2 SIGNAL CIRCUIT Turn the ignition off Disconnect the 1/2 O2 Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K141) O2 1/2 Signal circuit in the O2 Is the voltage between 4.5 and 5.0 volts? Yes >> Go To 4 No >> Check the (K141) O2 1/2 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 5. O2 SENSOR If there are no possible causes remaining, view repair. Repair Replace the O2 Sensor Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 184 ENGINE ELECTRICAL DIAGNOSTICS WK |