Nc/no relay – AEM 30-4900 Wideband Failsafe Gauge User Manual
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NC/NO Relay
The following are examples of how a NC/NO relay (Bosch PN 0-332-019-203 or similar) can be
configured for use with the Wideband Failsafe.
Signal Interrupt: The low side (ground) output from the Wideband Failsafe can be used to turn ON a NC
(normally closed) relay and interrupt the output signal from a boost controller to its boost solenoid (shown
below). NOTE: Be sure that pulling power from the boost solenoid will decrease boost down to the
wastegate spring pressure rather than increase boost to the turbochargers max. This will depend on what
type of wastegate is used and how it is plumbed with vacuum hose.
Auxiliary Device: The low side (ground) output from the Wideband Failsafe can be used to turn ON a NO
(normally open) relay and activate or deactivate an auxiliary device that can be used to reduce timing or
boost or control some other function when the current requirement is greater than 1.5 amps.
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