Dodge Ram Truck 1500-2500-3500. Manual — part 1258
P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM (CONTINUED)
3.
(K342) ASD OUTPUT CIRCUIT OPEN
Turn the ignition off.
Remove the ASD Relay from the PDC.
Disconnect the PCM harness connectors.
Measure the resistance of the (K342) ASD Relay Output circuit from the ASD Relay cavity in the PDC to the PCM
harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (K342) ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
ASD RELAY
Install a substitute relay for the ASD Relay.
Attempt to start the vehicle.
Did the engine start?
Yes
>> Replace the ASD Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
>> Go To 5
5.
(A14) FUSED B+ CIRCUITS
Turn the ignition off.
Remove the ASD Relay from the PDC.
Using a 12-volt test light, probe the (A14) Fused B+ circuits at the ASD Relay connector in the PDC.
Does the test light illuminate brightly?
Yes
>> Go To 6
No
>> Repair the open or short to ground in the (A14) Fused B+ circuits. Inspect the related fuse and repair
as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
6.
(K342) ASD RELAY OUTPUT CIRCUIT OPEN
Disconnect the PCM harness connectors.
Measure the resistance of the (K342) ASD Relay Output circuit from the ASD Relay cavity in the PDC to the PCM
harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (K342) ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 1954
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
DR/DH
P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM (CONTINUED)
7.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
9 - 1955
P1391-INTERMITTENT LOSS OF CMP OR CKP
9 - 1956
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
DR/DH
P1391-INTERMITTENT LOSS OF CMP OR CKP (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:
Engine running or cranking.
•
Set Condition:
When the failure counter reaches 20 for 2 consecutive trips.
Possible Causes
GOOD TRIP EQUAL TO ZERO
CMP WIRE HARNESS INSPECTION
TONE WHEEL/PULSE RING INSPECTION
CKP WIRE HARNESS INSPECTION
TONE WHEEL/PULSE RING INSPECTION
CHECKING INTERMITTENT CKP SIGNAL WITH LAB SCOPE
CAMSHAFT POSITION SENSOR
CRANKSHAFT POSITION SENSOR
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
1.
GOOD TRIP EQUAL TO ZERO
Ignition on, engine not running.
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.
With the scan tool, read DTCs and record the related Freeze Frame data.
Start the engine and run until operating temp is reached. (Closed Loop)
If the DTC does not return right away it may be necessary to test drive the vehicle to duplicate the DTC.
Does the P1391 return?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
INTERMITTENT CAM POSITION SENSOR SIGNAL
Turn the ignition off.
With the scan tool as a Dual Channel Lab Scope and Miller special tool #6801, backprobe the (K44) CMP Signal
circuit in the CMP 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 3
No
>> Go To 6
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
9 - 1957
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