P208A
P208A-(DIESEL EXHAUST FLUID) REDUCTANT PUMP CONTROL CIRCUIT OPEN
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Diesel Exhaust Fluid (DEF) Supply Pump Assembly has many functions. It's primary purpose is to draw fluid from the tank and build adequate system pressure for dosing into the exhaust. The DEF Dosing Control Unit provides the 12 Volt supply and ground for the pump. The DEF Dosing Control Unit also provides a Pulse Width Modulated (PWM) signal to the DEF Supply Pump Assembly to control the speed and output of the pump. The DEF Dosing Control Unit will illuminate the MIL light via the Powertrain Control Module (PCM) immediately after the diagnostics runs and fails and diesel exhaust fluid injection into the aftertreatment system is disabled. The DEF Dosing Control Unit will turn off the MIL light via the PCM when the monitor runs and passes in three consecutive key cycles.
- When Monitored:
Continuously with the ignition on.
- Set Condition:
The DEF Dosing Control Unit detects that the DEF Supply Pump circuit is open.
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
1. ACTIVE DTC
1. Turn the ignition on, engine not running.
2. With the scan tool, navigate to Systems Tests and actuate the Diesel Exhaust Fluid Doser Pump Override Test.
3. With the scan tool, View DTCs.
Is the DTC Active?
Yes
- Go To 3
No
- Perform the INTERMITTENT CONDITION - 6.7L. . Intermittent Condition Test
2. CHECK THE DEF SUPPLY PUMP ASSEMBLY
1. Turn the ignition off.
2. Disconnect the DEF Supply Pump Assembly harness connector.
3. Connect a jumper between the (K417) DEF Supply Pump Assembly Supply circuit and the (K419) DEF Supply Pump Assembly Signal circuit at the DEF Supply Pump Assembly harness connector.
NOTE: Be careful not to spread the terminals.
4. Turn the ignition on.
5. With a scan tool, View DTCs.
Did DTC P208D become active and DTC P208A change to stored with the jumper in place?
Yes
- Replace the DEF Supply Pump Assembly. Diesel Exhaust Fluid Pump Assembly - Removal.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.
No
- Go To 3
3. CHECK THE (K417) DEF SUPPLY PUMP ASSEMBLY SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the DEF Dosing Control Unit C1 harness connector.
3. Measure the resistance of the (K417) DEF Supply Pump Assembly Supply circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C1 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Go To 4
No
- Repair the (K417) DEF Supply Pump Assembly Supply circuit for an open or high resistance.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.
4. CHECK THE (K418) DEF SUPPLY PUMP ASSEMBLY RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K418) DEF Supply Pump Assembly Return circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C1 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Go To 5
No
- Repair the (K418) DEF Supply Pump Assembly Return circuit for an open or high resistance.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.
5. CHECK THE (K419) DEF SUPPLY PUMP ASSEMBLY SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K419) DEF Supply Pump Assembly Signal circuit between the DEF Supply Pump Assembly harness connector and the DEF Dosing Control Unit C1 harness connector.
Is the resistance below 5.0 Ohms?
Yes
- Replace the DEF Dosing Control Unit. Diesel Exhaust Fluid Dosing Control Unit - Removal.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.
No
- Repair the (K419) DEF Supply Pump Assembly Signal circuit for an open or high resistance.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.