Hard Or Intermittent Trouble Code E13: Notes
NOTE:
Following procedure is designed to account for intermittent codes. If no malfunction is uncovered using this procedure, it will indicate that DFI system is okay at this time.
When oxygen sensor is warm (above 392°F/200°C), output voltage will vary between 0 and 1 volt. This code indicates that oxygen sensor will not vary above or below its cold voltage of about 0.5 volt and that system will not go into closed loop operation. Possible causes are: Oxygen sensor not functioning properly, defective wires, terminals, etc., or ECM not processing signal properly.
NOTE:
The following step numbers refer to the numbers in the accompanying flow chart(s).
- To check operation of oxygen sensor, observe engine data parameter P.0.7 with oxygen sensor disconnected. If reading is less than .37 or greater than .57, wiring harness must be investigated for defects. If wiring is okay, ECM connector and ECM must be checked because system is not functioning properly.
- If reading is .37-.57 volt, then jumper oxygen sensor harness pin to ground (ECM side) and note reading. If reading is greater than .05 volt, ECM is not able to recognize that fault was artificially created. Therefore, either ECM is not working properly or an oxygen sensor circuit is open between connector and ECM.
- If reading is less than 0.5 volt, ECM is functioning properly and harness is okay. Oxygen sensor should be checked using CHART A4.