Operation CHARM: Car repair manuals for everyone.
Home >> Dodge and Ram >> 2002 >> RAM 1500 Van V8-5.9L VIN Z LDC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Oxygen Sensor Relay >> Description and Operation
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Oxygen Sensor Relay: Description and Operation

O2 HEATER RELAY
5.9L/8.0L Only
The oxygen (O2) sensor heater relay is located in the Powertrain Distribution Center (PDC). Relay Boxapplications and ID.

Oxygen Sensor Heater Relay:
If the vehicle is equipped with 4 oxygen sensors, a separate oxygen sensor relay is used to supply voltage to the sensor heating elements. This particular relay is used only for the 1/2 and 2/2 downstream sensors. Voltage for the other 2 sensor heating elements is supplied directly from the ASD relay. Refer to Wiring Diagrams to determine which relay is used. Electrical Diagrams

To avoid the large simultaneous current surge needed to operate all 4 sensors, power is delayed to the 2 downstream heater elements by the PCM for approximately 2 seconds.


pro multis · About Operation CHARM