Code EO58, Pass-Key Fuel Enable Circuit: Notes

Personal Automotive Security System (PASS-KEY) is designed to disable vehicle operation if an incorrect ignition key or starting procedure is used. If correct key and starting technique is used, PASS-KEY decoder module sends a fuel enable signal to the PCM and also energizes starter enable relay. If the proper signal does not reach the PCM on circuit No. 229, the PCM will not pulse the injectors and the vehicle will not start and Code 58 will set.

1. If vehicle will not crank with Code 58 stored, problem affects entire PASS-KEY system and is not isolated to fuel enable circuit.
2. The PCM applies and monitors a 5-volt signal on circuit No. 229. Decoder module will pulse this signal to ground when proper key and starting technique is used. This test ensures that PCM is supplying the 5-volt signal and that circuit is not open or shorted to ground.
3. Checks PWM signal from PASS-KEY module. Since the 5 volts supplied by the PCM is being pulsed to ground, voltage on circuit No. 229 should measure about 2.5 volts.
4. Checks for a faulty PCM or intermittent condition by clearing code. Since the PCM ignores the absence of a fuel enable signal only when Code 58 is stored, vehicle should not start if the problem is present and Code 58 is not.