Dodge Ram Truck 1500-2500-3500. Manual — part 1137
P2609-NO VOLTAGE DROP SEEN FROM INTAKE AIR HEATERS
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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
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P2609-NO VOLTAGE DROP SEEN FROM INTAKE AIR HEATERS (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
First 15 seconds of engine operation.
•
Set Condition:
The ECM does not detect a voltage drop on the intake air heater circuit.
Possible Causes
INTAKE AIR HEATER OPEN
INTAKE AIR HEATER GROUND OPEN
OPEN BATTERY CABLE FROM INTAKE AIR HEATER RELAY
BATTERY CABLE OPEN
#1 INTAKE AIR HEATER RELAY
#2 INTAKE AIR HEATER RELAY
INTERMITTENT CONDITION
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
INTAKE AIR HEATER OPEN
Measure the resistance between the intake air heater supply and ground terminal on each intake air heater.
Is the resistance less than 10 Ohms?
Yes
>> Go To 2
No
>> Replace the open Intake Air Heater.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
2.
INTAKE AIR HEATER GROUND OPEN
Measure the resistance of the intake air heater ground circuit between the intake air heater terminal and the intake
manifold cover ground connection.
NOTE: The intake air heater circuit is grounded through a conductive gasket on the top and bottom of the
air heater (grey colored gaskets).
Is the resistance less than 10 Ohms?
Yes
>> Go To 3
No
>> Repair the open Intake Air heater ground or replace both heater gaskets with the proper conductive
gaskets..
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
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P2609-NO VOLTAGE DROP SEEN FROM INTAKE AIR HEATERS (CONTINUED)
3.
OPEN BATTERY CABLE FROM INTAKE AIR HEATER RELAY
Measure the resistance of the battery cable between the intake air heater and the intake air heater relay for both
intake air heaters.
Is the resistance less than 10 Ohms?
Yes
>> Go To 4
No
>> Repair The open or high resistance battery cable from the intake heater relay to heater.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
4.
BATTERY CABLE OPEN
Measure the resistance of the battery cable between the battery and the intake air heater relay for both relays.
Is the resistance less than 10 Ohms?
Yes
>> Go To 5
No
>> Replace the battery cable from the battery to the Intake Air Heater Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
5.
#1 INTAKE AIR HEATER RELAY
Disconnect the #1 intake air heater relay signal wire.
Connect a jumper wire from the signal terminal of the #1 intake air heater relay to battery positive.
Did the relay click when 12 volts was applied?
Yes
>> Go To 6
No
>> Replace #1 Intake Air Heater Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
6.
#2 INTAKE AIR HEATER RELAY
Disconnect the #2 intake air heater relay signal wire.
Connect a jumper wire from the signal terminal of the #2 intake air heater relay to battery positive.
Did the relay click when 12 volts was applied?
Yes
>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
No
>> Replace #2 Intake Air Heater Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
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ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
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*ENGINE SPEED SURGES UNDER LOAD OR IN OPERATING RANGE
Possible Causes
POSSIBLE CAUSES
Diagnostic Test
1.
POSSIBLE CAUSES
This is a list of possible causes:
Check for any TSBs for ECM calibration updates that my apply.
Fuel level low.
Fuel filter plugged.
Poor quality or improper grade of fuel.
Fuel tank venting.
Low fuel pressure.
Air in fuel system
Fuel Lift Pump malfunctioning.
Fuel Inlet restriction.
Fuel line kinked or restricted.
Fuel return passage or fuel return line kinked or restricted.
Injectors are incorrect.
Injector shim thickness is incorrect.
Injector malfunction.
Fuel connector leaking fuel.
Accelerator pedal is restricted or out of calibration.
Crankshaft position sensor (CKP) or Camshaft position sensor (CMP) and/or circuit malfunction.
Vehicle Speed sensor (VSS) and/or circuit malfunction.
Incorrect Transmission Clutch operation.
Check vehicle brakes for dragging, transmission malfunction, cooling fan operation cycle time and engine driven
devices.
Check for proper turbocharger, turbo charger wheel clearance is out of specifications, waste gate for correct oper-
ation.
Bus communication problems.
Moisture in harness connectors or corroded terminals.
Internal engine damage.
Fuel control actuator
Speed indicator ring
Pressure Limiting valve
Air inlet restriction
External fuel leaks
Injector circuit
High pressure fuel pump
View repair
Repair
Repair as necessary. Refer to Service Information for the related symptom(s).
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
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