If SPN 3609/FMI 4 and SPN 3610/FMI 4 are present, repair open between Aftertreatment Control Module (ACM) pin 117 and Diesel Oxidation Catalyst (DOC)/Diesel Particulate Filter (DPF) pressure sensors pin 3.
If only SPN 3609/FMI 4 is presentGo to step 2.
Turn the ignition OFF (key OFF, engine OFF).
Disconnect the DOC inlet pressure sensor.
Inspect the DOC inlet pressure sensor harness for bent, spread, or corroded pins.
If the pins are bent, spread, or corroded, repair as necessary.
If the connector shows no signs of damage,Go to step 5.
Disconnect the ACM 120-pin connector.
Measure the resistance between pin 2 of the DOC inlet pressure sensor and ground.
If the resistance is less than 1k ohms, repair short to ground between pin 2 of the DOC inlet pressure sensor and pin 87 of the ACM 120-pin connector.
If the resistance is greater than 1K ohmsGo to step 7.
Measure the resistance between pin 2 of the DOC inlet pressure sensor and pin 87 of the ACM 120-pin connector.
If the resistance is greater than 3 ohms repair wire between pin 2 of the DOC inlet pressure sensor and pin 87 of the ACM 120-pin connector.
If the resistance is less than 3 ohms, replace the DOC inlet pressure sensor