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I have a spn4358 5 Cade def metering unit doser heater

Customer Question
I have a spn4358...

I have a spn4358 5 Cade def metering unit doser heater circuit failed open say check voltage at doser heater I need the location for doser heater

Mechanic's Assistant: What's the make/model/year of your truck? Engine type?

2013 Detroit dd13 freightliner cascadia

Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far?

Yes can’t find doser heater

Mechanic's Assistant: Anything else you want the truck mechanic to know before I connect you?

Is the wiring from acm to 1 box the same

Submitted: 3 months ago.Category: Medium and Heavy Trucks
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Answered in 26 minutes by:
3/28/2018
Technician: roybelding, Shop Foreman Freightliner trucks replied 3 months ago
roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 7,755
Experience: Shop Froeman for Freightliner Trucks
Verified

hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

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Technician: roybelding, Shop Foreman Freightliner trucks replied 3 months ago

below is the flow chart. will look for a picture

497.3  SPN 4358/FMI 5 - EPA10

Diesel Exhaust Fluid Metering Unit Doser Heater Circuit Failed Open

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  1. Disconnect the Diesel Exhaust Fluid (DEF) metering unit doser heater connector.
  2. Inspect the sensor harness for bent, spread, or corroded pins.
    1. If the pins are bent, spread, or corroded, repair as necessary.
    2. If connector shows no signs of damage, Go to step 3.
  3. Turn the ignition ON (key ON, engine OFF).
  4. Measure the voltage between pin 2 on the harness side of the DEF metering unit doser heater connector and ground.
    1. If the voltage is greater than 11.75 volts, Go to step 5.
    2. If the voltage is less than 11.75 volts, repair the wire between pin 2 on the harness side of the DEF metering unit doser heater and pin 39 of the ACM 120-pin connector.
  5. Measure the voltage between pin 1 on the harness side of the DEF metering unit doser heater connector and ground.
    1. If the voltage is between 2.25 and 2.50 volts, replace the DEF metering unit doser heater.Refer to section "Removal of the Diesel Exhaust Fluid Metering Unit Doser Heater" .
    2. If the voltage is not between 2.25 and 2.50 volts, repair the wire between pin 1 of the DEF metering unit doser heater connector and pin 16 of the ACM 120-pin connector.
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Technician: roybelding, Shop Foreman Freightliner trucks replied 3 months ago

do you have any other questions???

Roy

Please take a moment and rate my service 3 stars or better. that is the only way the site will pay me for my efforts.

Roy

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Technician: roybelding, Shop Foreman Freightliner trucks replied 3 months ago

any update???

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