DEF Concentration Is Incorrect
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| Diagnostic Trouble Codes for DEF Concentration Is Incorrect | ||
| J1939 Code and Description | Pre-Conditions for Code | Comments |
| 3516-2
Aftertreatment #1 DEF Concentration : Erratic, Intermittent, or Incorrect |
- Battery voltage is normal.
- Key switch signal (ECM: V13 & V33, DCU: 18 terminal) is continuously activated more than 2 sec. - Starter Switch signal (ECM: V12 terminal) is not activated except within 2 sec after starter stopped. - CAN communication is normal between DCU and engine ECM. - CAN communication is normal between DCU and TANK sensor. |
DEF type from DEF TANK sensor via CAN is indicating Diesel or oil in the DEF for 30 seconds or more.
Stop DEF injection. |
| (3516-11)
Aftertreatment #1 DEF Concentration : Other Failure Mode |
Quality sensor FMI from DEF TANK via CAN is indicating FMI 3 (Sensor element OPEN), or FMI 4 (Internal sensor error), or invalid concentration data is received for 175 seconds or more.
Stop DEF injection |
|
| 3516-12
Aftertreatment #1 DEF Concentration : Failure |
DEF type from DEF TANK sensor via CAN is indicating 13 (Unknown), or 14 (Error) for 175 seconds or more. | |
| 3516-16
Aftertreatment #1 DEF Concentration : High - moderate severity (2) |
- Battery voltage is normal.
- Key switch signal (ECM: V13 & V33, DCU: 18 terminal) is continuously activated more than 2 sec. - Starter Switch signal (ECM: V12 terminal) is not activated except within 2 sec after starter stopped. - CAN communication is normal between DCU and engine ECM. - CAN communication is normal between DCU and TANK sensor. - DEF Tank Quality sensor operation is normal. - DEF temperature is more than trigger value. - |
DEF concentration data from DEF TANK via CAN is higher than 40% for 350 seconds or more. |
| 3516-18
Aftertreatment #1 DEF Concentration : Low - moderate severity (2) |
DEF concentration data from DEF TANK via CAN is lower than 25% for 350 seconds or more. | |
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| Troubleshooting Test Steps | Values | Results |
1. Check the DEF Quality A. Check the DEF Quality. Refer to Testing and Adjusting, "Diesel Exhaust Fluid Quality – Test". |
DEF Quality Meets Standard | Result: If the DEF is contaminated with diesel or oil as per 3516-2. Repair: For 3516-2 Diesel or Oil in DEF.If diesel or oil is confirmed in the DEF, the following DEF components must be replaced: DEF Tank, DEF Heater Unit, DEF Pump, DEF Lines, and DEF Injector. Result: The DEF concentration is not within acceptable range. Repair: Refer to Testing and Adjusting, "Diesel Exhaust Fluid Tank – Flush". |
2. Refill the DEF Tank A. Refill the DEF Tank. Refer to OMM. Check to see if the code comes back. |
Active Code |
Result: Check to see if the code comes back. |
3. Check harness continuity between the DEF Heater Unit and the DCU. |
Continuity |
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