Dodge Ram Truck 1500-2500-3500. Manual — part 1067

P0251-CP3 PUMP REGULATOR CONTROL (CONTINUED)

8.

(K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO ANOTHER CIRCUIT

Measure the resistance between the (K181) FCA driver circuit in the
ECM harness connector and all other circuits in the ECM connectors.

Is the resistance less than 10 Ohms?

No

>> Go To 9

Yes

>> Repair the (K181) FCA driver circuit shorted to another cir-

cuit.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

9.

(K31) FUEL CONTROL ACTUATOR RETURN CIRCUIT SHORTED TO ANOTHER CIRCUIT

Measure the resistance between the (K31) FCA Return circuit in the
ECM harness connector and all other circuits in the ECM connectors.

8

Is the resistance less than 10 Ohms?

No

>> Go To 10

Yes

>> Repair the (K31) FCA Return circuit shorted to another cir-

cuit.

Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)

9 - 1190

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0251-CP3 PUMP REGULATOR CONTROL (CONTINUED)

10.

ECM

Reconnect the ECM harness connectors.

Ignition on, engine not running.

Disconnect the Electronic Fuel Control Actuator connector.

Connect an incandescent test light across the Fuel Control Actuator
driver pin and the Fuel Control Actuator return wire at the fuel control
actuator connector.

Observe the test light.

The ECM will perform a self test of the circuit which should momen-
tarily flash the test light brightly, one time, approximately 20 seconds
after being connected.

NOTE: Compare test light brightness to that of a direct connec-
tion to the battery.

Did the light flash brightly?

Yes

>> Refer to the INTERMITTENT CONDITION Symptom

(Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNO-
SIS AND TESTING)

No

>> Replace the ECM.

Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1191

P0299-BOOST IN RANGE LOW

9 - 1192

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

DR/DH

P0299-BOOST IN RANGE LOW (CONTINUED)

For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
While engine is running.

•

Set Condition:
The boost pressure is lower than the expected boost pressure based on engine operating conditions.

Possible Causes

OTHER DTC’S

INTAKE AIR SYSTEM RESTRICTION

TURBO CHARGER DAMAGED

INTAKE AIR SYSTEM LEAK

BOOST PRESSURE SENSOR

BOOST PRESSURE SENSOR

TURBOCHARGER

INTERMITTENT CONDITION

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)

Diagnostic Test

1.

OTHER DTC’S

Turn the ignition on.

With the scan tool, read the Engine DTC’s.

Do you have other DTC’s?

Yes

>> Repair other boost related DTC’s first.

Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

No

>> Go To 2

2.

INTAKE AIR SYSTEM RESTRICTION

Inspect the air filter and intake air system for signs of restriction.

Were any restrictions found?

Yes

>> Replace the Air Filter or repair the Intake air system for restriction.

Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

No

>> Go To 3

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL

9 - 1193