BRACKET 1566951 - Caterpillar

Table 1
Diagnostic Codes for the Solenoid Valves
J1939 Code and Description Pre-Conditions for Code Comments
3363-3
Aftertreatment #1 DEF Tank Heater : Voltage Above Normal Battery voltage is normal
- Key switch signal (ECM: V13 and 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
- Diagnosis has not completed during 160 sec after DCU power on +B Short Circuit of Harness
+B Short Circuit of Coolant Valve Coil
When the High-side switch is off, the coolant valve terminal monitoring voltage (1) is 1.937 V or more (only just after the DCU power turns on) for at least 80 sec.
Stop coolant valve
3363-4
Aftertreatment #1 DEF Tank Heater : Voltage Below Normal Ground Short or open circuit of harness
Ground short or open circuit of coolant valve coil
When the High-side switch is on, the coolant valve terminal monitoring voltage (*1) is 0.503 V or less. (only just after the DCU power turns on) for at least 80 sec
Stop Coolant valve
3363-5
Aftertreatment #1 DEF Tank Heater : Current Below Normal Open Circuit of harness
Open circuit of coolant valve heater coil
When the High-side switch is on, the coolant valve terminal monitoring voltage (1) is 0.503 V or more and 1.937 V or less. (only just after the DCU power turns on) for at least 80 sec
Stop coolant valve