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P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW (CONTINUED) 4. (K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the (K99) O2 Heater Control circuit (PWM) Is the resistance below 5.0 ohms? Yes >> Go To 5 No >> Repair the open in the (K99) O2 Heater Control (PWM) circuit. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 5. (K99) HEATER CONTROL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K99) O2 Heater Is the resistance below 100 ohms? Yes >> Repair the short to ground in the Heater Control (PWM) circuit or the Heater Relay Control circuit depending on the Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 No >> Go To 6 9 - 1494 ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10 DR/DH |