Jeep Wagoneer/Commando/Cherokee 1984-1998

Latch Relay

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OPERATION



See Figures 1 and 2

The latch relay is located on the right inner fender panel. This relay is initially energized during engine startup and remains energized until 3-5 seconds after the engine is stopped. This enables the ECU to extend the idle speed stepper motor for the next startup, then cease operation.

TESTING



A relay in the de-energized position should have continuity between terminals 87A and 30. Resistance values between terminals 85 and 86 is 70-80 ohms for resistor relays and 81-91 ohms for diode relays. Not all relays have battery voltage connected to terminal 30. Some may have battery voltage connected to terminals 87 or 87A.



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Fig. Fig. 1: Relay locations on the-Renix MPI system



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Fig. Fig. 2: Relay terminal identification-Renix MPI system

 
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