C7.1 Engines For Caterpillar Built Machines Caterpillar

The Electronic Control Module (ECM) monitors the temperature at the intake of the Diesel Particulate Filter (DPF). The ECM activates the following code when the conditions are met.

Table 1

Diagnostic Trouble Code
J1939 Code	Code Description	Comments
3242-18	Particulate Trap Intake Gas Temperature : Low - moderate severity (2)	The Aftertreatment Regeneration Device (ARD) has been running for at least 30 seconds. The temperature at the intake of the DPF is below 50° C (122° F). Active regeneration is immediately disabled. Engine power is derated. The code is logged. The code remains active until electrical power to the ECM is cycled.
Follow the troubleshooting procedure in order to identify the root cause of the fault.

Illustration 1	g02443538
(1) Diesel Oxidation Catalyst (DOC) (2) Clamps (3) DOC intake (4) ARD outlet duct (5) ARD combustion head

1. Check for evidence of any gas leaks in the duct between the ARD combustion head and the DPF.

2. Carefully inspect the duct between the outlet of the ARD and the intake to the DOC. Look for the following faults:
   • Missing duct, cracked duct, or disconnected duct

   • Loose clamps, broken clamps, or missing clamps

3. Make sure that the clamp between the DOC and the DPF is not missing, broken, or loose.

4. Perform any necessary repairs.