P20B0
P20B0-(DIESEL EXHAUST FLUID) REDUCTANT PUMP TEMPERATURE PERFORMANCE
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Diesel Exhaust Fluid (DEF) Supply Pump Assembly has an internal temperature sensor which reports the internal temperature of the DEF Supply Pump Assembly to the DEF Dosing Control Unit. This fault is triggered if the DEF Supply Pump Assembly Temperature Sensor is different than the other temperature sensors on the engine. This indicates an internal problem in the DEF Supply Pump Assembly.
- When Monitored:
At ignition on. Monitor runs until the DEF Supply Pump attempts to prime the system.
- Set Condition:
The Supply Pump temperature reading is erratic or the Supply Pump internal temperature is not communicated to Powertrain Control Module by the DEF Dosing Control Unit.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
1. ACTIVE DTC
NOTE: Diagnose and repair any other DEF system DTCs that are active before continuing with this test procedure.
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.
Is the DTC active?
Yes
- Go To 2
No
- Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. . Intermittent Condition Test
2. CHECK THE (K419) DEF SUPPLY PUMP ASSEMBLY SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the DEF Supply Pump Assembly harness connector.
3. Disconnect the DEF Dosing Control Unit C1 harness connector.
4. Measure the resistance between ground and the (K419) DEF Supply Pump Assembly Signal circuit at the DEF Supply Pump Assembly harness connector.
Is the resistance above 10k Ohms?
Yes
- Replace the DEF Supply Pump Assembly. Diesel Exhaust Fluid Pump Assembly - Removal.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.
No
- Repair the (K419) DEF Supply Pump Assembly Signal circuit for a short to ground.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.