Dodge Ram Truck 1500-2500-3500. Manual — part 1259
P1391-INTERMITTENT LOSS OF CMP OR CKP (CONTINUED)
3.
CMP WIRE HARNESS INSPECTION
Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mount-
ing bolt(s) are torqued to specification.
Refer to any TSB that may apply.
Were any of the above conditions present?
Yes
>> Repair as necessary
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
TONE WHEEL/PULSE RING INSPECTION
Turn the ignition off.
Remove the Camshaft Position Sensor.
Inspect the Tone Wheel/Pulse Ring for damage, foreign material, or excessive movement.
Were any problems found?
Yes
>> Repair or replace the Tone Wheel/Pulse Ring as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
5.
CAMSHAFT POSITION SENSOR
If there are no possible causes remaining, view repair.
Repair
Replace the Camshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
6.
CHECKING CKP SIGNAL WITH THE SCAN TOOL LAB
Turn the ignition off.
With the scan tool as a Dual Channel Lab Scope and the Miller special tool #6801, backprobe the (K24) CKP Signal
circuit in the CKP harness connector and PCM harness connector.
WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hand
near the pulleys, belts, or fan. Do not wear loose clothing.
Start the engine.
Observe the lab scope screen.
Are there any irregular or missing signals?
Yes
>> Go To 7
No
>> Go To 10
9 - 1958
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
DR/DH
P1391-INTERMITTENT LOSS OF CMP OR CKP (CONTINUED)
7.
CKP WIRE HARNESS INSPECTION
Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Ensure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting
bolt(s) are torqued to specification.
Refer to any TSB that may apply.
Were any of the above conditions present?
Yes
>> Repair as necessary
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
8.
TONE WHEEL/FLEX PLATE INSPECTION
Remove the Crankshaft Position Sensor.
Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive movement.
Were any problems found?
Yes
>> Repair or replace the Tone Wheel/Flex Plate as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 9
9.
CRANKSHAFT POSITION SENSOR
If there are no possible causes remaining, view repair.
Repair
Replace the Crankshaft Position Sensor.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
10.
CHECKING CKP SIGNAL WITH LAB SCOPE
NOTE: The conditions that set this DTC are not present at this time. The following test may help in identi-
fying the intermittent condition.
Turn the ignition off.
With the scan tool as a Dual Channel Lab Scope and the Miller special tool #6801, backprobe the (K24) CKP Signal
circuit in the PCM harness connector and CKP harness connector.
WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hand
near the pulleys, belts, or fan. Do not wear loose clothing.
Start the engine.
Carefully wiggle the related wire harness and gently tap on the CKP sensor.
Compare the Channel 1 reading to the Channel 2 reading on the lab scope screen.
Both of the readings should be the same.
Were any of the above conditions present?
Yes
>> Repair the wiring or connector concern.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Test Complete.
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
9 - 1959
P1398-MIS-FIRE ADAPTIVE NUMERATOR AT LIMIT
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:
Under closed throttle decel and Fuel Pulse Width equal to zero for 30 seconds.
•
Set Condition:
One of the CKP sensor target windows has more than 2.86% variance from the reference window.
Possible Causes
ADAPTIVE NUMERATOR RELEARN
CMP SENSOR CONNECTOR/WIRING
CKP SENSOR CONNECTOR/WIRING
DAMAGED TONE WHEEL/FLEX PLATE (CRANKSHAFT)
CRANKSHAFT POSITION SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
1.
ADAPTIVE NUMERATOR RELEARN
NOTE: Check for any TSB’s that may apply to this symptom.
Read and record the Freeze Frame Data. Use this information to help you duplicate the conditions that set the DTC.
Pay particular attention to the DTC set conditions, such as, VSS, MAP, ECT, and Load.
Ignition on, engine not running.
With the scan tool in the miscellaneous menu, choose Clear PCM (battery disconnect) to reset the PCM.
With the scan tool, choose the Misfire Pretest screen.
Road test the vehicle and re-learn the adaptive numerator.
The adaptive numerator is learned when the Adaptive Numerator Done Learning line on the Misfire screen changes
to Yes.
Did the adaptive numerator re-learn?
Yes
>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
9 - 1960
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
DR/DH
P1398-MIS-FIRE ADAPTIVE NUMERATOR AT LIMIT (CONTINUED)
2.
CMP CONNECTOR/HARNESS INSPECTION
Turn ignition off.
NOTE: Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded
terminals.
NOTE: Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken
wires.
NOTE: Make sure the Camshaft Position Sensor is tight.
NOTE: Refer to any technical service bulletins that may apply.
Were any problems found?
Yes
>> Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
3.
CKP CONNECTOR/HARNESS INSPECTION
NOTE: Visually inspect the Crankshaft Position Sensor and related wire harness connectors. Look for bro-
ken, bent, pushed out, or corroded terminals.
NOTE: Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken
wires.
NOTE: Verify the Crank Position Sensor is properly installed.
Were any problems found?
Yes
>> Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
4.
TONE WHEEL/FLEX PLATE INSPECTION
Disconnect and remove the Crankshaft Position Sensor.
Inspect the tone wheel/flexplate slots for damage, foreign material, or excessive movement.
Is the tone wheel/flexplate free from defects?
Yes
>> Go To 5
No
>> Repair/replace tone wheel/flex plate as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
9 - 1961
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