ECM Code EO58: Pass Key Control Problem: Action:

ECM commands BCM to display SERVICE ENGINE SOON message on CCDIC panel and will enable fuel injection on future ignition cycles without regard for pass key fuel enable input status.

Once engine is running, ECM constantly monitors fuel enable signal from pass key module. ECM will not cancel fuel injection once it has seen a proper pass key module signal; therefore, stalling conditions cannot occur as a result of a pass key malfunction.

NOTE: Test numbers refer to test numbers on diagnostic chart.

Test Number 1) If engine will crank, problem has been isolated to pass key module, ECM or fuel enable circuit. If engine will not crank, refer to appropriate service manual for pass key system diagnosis.

Test Number 2) Checking voltage to ECM will identify if ECM is at fault. Typical signal will be about 2.5 volts.

Test Number 3) Voltage too low could be a pass key module, poor connection at ECM, or a short to ground in fuel enable circuit.

Test Number 4) Voltage too high could be a pass key module, poor connection at pass key module, short to voltage or an open in fuel enable circuit.