Dodge Ram Truck 1500-2500-3500. Manual — part 868

P0315-NO CRANK SENSOR LEARNED (CONTINUED)

For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Under closed throttle decel and A/C off. ECT above 75°C (167°F). Engine start time is greater than 50 sec-
onds.

•

Set Condition:
One of the CKP sensor target windows has more than 2.86% variance from the reference. One Trip Fault.
Three good trips to turn off the MIL.

Possible Causes

TONE WHEEL/PULSE RING

WIRE HARNESS

CRANKSHAFT POSITION SENSOR

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

Diagnostic Test

1.

ACTIVE DTC

Ignition on, engine not running.

With a scan tool, clear DTCs, PCM battery disconnect to reset the PCM.

Start the engine.

If the MIL has not yet illuminated, test drive the vehicle to try to get the code to reset.

Does the code reset while cranking or during the test drive?

Yes

>> Go To 2

No

>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

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P0315-NO CRANK SENSOR LEARNED (CONTINUED)

2.

WIRE HARNESS INSPECTION

Turn the ignition off.

Visually inspect the CKP wire harness. Look for any chafed, pierced,
pinched, or partially broken wires.

Visually inspect the CKP wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.

Make sure the Crankshaft Position Sensor is properly installed and the
mounting bolt(s) are torqued to the proper specification.

Were any of the above conditions present?

Yes

>> Repair as necessary

Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 3

3.

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 the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Go To 4

4.

CRANKSHAFT POSITION SENSOR

If there are no possible causes remaining, view repair.

Repair

Replace the Crankshaft Position Sensor.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

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P0325-KNOCK SENSOR 1 CIRCUIT

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ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

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P0325-KNOCK SENSOR 1 CIRCUIT (CONTINUED)

For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Engine running.

•

Set Condition:
The Knock Sensor circuit voltage falls below a minimum value at idle or deceleration. The minimum value is
from a look-up table internal to the PCM and is based on engine RPM. DTC will also set if the sensor voltage
goes above 5.0 volts. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes

(K42) KNOCK SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

(K42) KNOCK SENSOR NO.1 SIGNAL CIRCUIT OPEN

(K942) KNOCK SENSOR NO.1 RETURN CIRCUIT OPEN

(K42) KNOCK SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO THE (K942) KNOCK SENSOR NO.1 RETURN
CIRCUIT

(K42) KNOCK SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO GROUND

KNOCK SENSOR

PCM

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

Diagnostic Test

1.

ACTIVE DTC

Ignition on, engine not running.

With a scan tool, read DTCs.

Is the DTC active at this time?

Yes

>> Go To 2

No

>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L

9 - 397