RAM 1500 Van V8-5.2L CNG VIN T (1999)
Automatic Shut Down (ASD) Relay: Testing and Inspection
AUTOMATIC SHUT DOWN (ASD) RELAY
The following operation/tests apply only to the Automatic Shutdown (ASD) and fuel pump relays . For operations/tests on all other relays, refer to
the appropriate service manual.
Power Distribution Center (PDC) Location
These relays are located in the Power Distribution Center (PDC). Refer to label on PDC cover for relay location.
ASD and Fuel Pump Relay Terminals
The terminals on the bottom of each relay are numbered.
Operation
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Terminal number 30 is connected to battery voltage. For both the ASD and fuel pump relays, terminal 30 is connected to battery voltage at all
times.
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The PCM grounds the coil side of the relay through terminal number 85.
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Terminal number 86 supplies voltage to the coil side of the relay
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When the PCM de-energizes the ASD and fuel pump relays, terminal number 87A connects to terminal 30. This is the Off position. In the off
position, voltage is not supplied to the rest of the circuit. Terminal 87A is the center terminal on the relay.
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When the PCM energizes the ASD and fuel pump relays, terminal 87 connects to terminal 30. This is the On position. Terminal 87 supplies
voltage to the rest of the circuit.
Testing
The following procedure applies to the ASD and fuel pump relays.
