Dodge Ram Truck 1500-2500-3500. Manual — part 1048
P0118-ENGINE COOLANT TEMPERATURE (ECT) SENSOR VOLTAGE TOO HIGH (CONTINUED)
7.
ECM
Reconnect the ECM harness connectors.
Turn the ignition on.
With the scan tool, erase DTCs.
While monitoring with scan tool, use a jumper wire and connect the
sensor (K2) signal circuit to the (K914) sensor return circuit at the sen-
sor connector.
Did the DTC P0117 set?
Yes
>> Test Complete.
No
>> Replace the ECM.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
9 - 1114
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0128-THERMOSTAT RATIONALITY
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 the engine is running.
•
Set Condition:
The coolant temperature does not rise by a calibrated amount over a calibrated amount of time.
Possible Causes
COOLING FAN
COOLANT TEMPERATURE SENSOR
THERMOSTAT
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
COOLING FAN
NOTE: refer to the no trouble code test
9
*Fan Operation Test
9
to ensure the fan is operating properly.
Is the cooling fan operating properly?
Yes
>> Go To 2
No
>> Repair the cooling fan.
Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
2.
COOLANT TEMPERATURE SENSOR
Operate the engine for 10 minutes while monitoring the coolant temperature with the scan tool.
Did the coolant temperature change over time while the engine was running?
Yes
>> Go To 3
No
>> Replace the coolant temperature sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
3.
THERMOSTAT
NOTE: refer to the no trouble code test
9
*Thermostat Test
9
to ensure the thermostat is operating properly.
is the thermostat operating properly?
Yes
>> Test Complete.
No
>> Replace the thermostat.
Perform POWERTRAIN VERIFICATION TEST VER - 2 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1115
P0148-HIGH PRESSURE COMMON RAIL (HPCR) CHECKSUM
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 the engine is running.
•
Set Condition:
A deviation between the fuel pressure set point and the actual fuel pressure.
Possible Causes
OTHERS DTC’S PRESENT
FUEL LEAKS
FUEL CONTROL ACTUATOR
FUEL PRESSURE SENSOR
CASCADE OVERFLOW VALVE
CHECK VALVE DAMAGED OR BLOCKED
FUEL RETURN LINES OBSTRUCTION, DAMAGE, OR DEBRIS.
LIFT PUMP FLOW
AIR IN FUEL SYSTEM
LEAKING FUEL INJECTORS OR HIGH PRESSURE CONNECTORS
PRESSURE LIMITING VALVE
HIGH PRESSURE FUEL PUMP
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
OTHERS DTC’S PRESENT
With the scan tool, read DTCs.
Are any other DTC’s present?
Yes
>> Repair other DTC’s first.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
No
>> Go To 2
2.
FUEL LEAKS
Ensure that the fuel level is above 15% using the scan tool.
Visually inspect the low and high pressure side of the fuel system for fuel leaks or damaged components.
Do you have any fuel leaks or damaged components?
Yes
>> Repair the fuel leak.
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
9 - 1116
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0148-HIGH PRESSURE COMMON RAIL (HPCR) CHECKSUM (CONTINUED)
3.
FUEL CONTROL ACTUATOR
Check for a mechanically stuck Fuel Control Actuator (FCA). Using the scan tool, actuate the fuel control actuator.
NOTE: The fuel control actuator will only click when cycled off..
Do you hear a click from the actuator when you cycle the actuator off with the scan tool?
Yes
>> Go To 4
No
>> Replace the fuel Injector pump.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
4.
FUEL PRESSURE SENSOR
Using the scan tool, monitor the fuel pressure reading from the fuel rail pressure sensor at idle and at 2000 RPM
Is the fuel rail pressure reading higher at 2000 RPM than at idle?
Yes
>> Go To 5
No
>> Replace the fuel pressure sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
5.
HIGH FUEL PRESSURE
Using the scan tool compare the fuel rail pressure set point with the actual fuel rail pressure.
Is the actual fuel rail pressure higher than the fuel rail pressure set point?
Yes
>> Go To 6
No
>> Go To 9
6.
CASCADE OVERFLOW VALVE
Perform the no trouble code test
9
*fuel pump return flow test
9
. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
Did the fuel injection pump pass the test?
Yes
>> Go To 7
No
>> Replace the Fuel pump.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
7.
CHECK VALVE DAMAGED OR BLOCKED
Check the fuel drain line check valve in the rear of the cylinder head for signs of damage, blockage, or debris.
Is the check valve damaged or blocked?
Yes
>> Repair the cause of the damaged or blocked check valve or replace the valve.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Go To 8
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1117
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