Many systems aboard the ZR1 are monitored by the Electronic Control Module (ECM). Theoretically, when a monitored system moves out of a predetermined range, the SES light will come on. The SES light will also appear if an electrical short or open in a monitored circuit occurs. There are also several common reasons for this warning to appear.

On all year models, if the SES comes on during hard acceleration, then most probably a code 61, Secondary Throttle system error has occurred. Test you vacuum pump (located in the right front headlight cavity) by turning on both ignition and power keys (do not start the engine) and disconnecting the secondary vacuum connection coming from the pump. The pump should turn on immediately and run continuously. Place a finger over the open line and the pump should suck down and quit running. Check all other vacuum connections. Particular to the '93 model year, we have seen a tremendous amount of problems with the Exhaust Gas Recirculation (EGR) systems. This may also be compounded by a faulty PROM (Programmed Read Only Memory) calibration. There is an updated replacement PROM available from your dealer.

Note: When the SES is illuminated, both the cruise control and secondary throttle systems will become inoperative.

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