P0315-NO CRANK SENSOR LEARNED
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
At closed throttle decel, with the A/C off, ECT greater than 75° C (167° F) and engine run time greater than 50 seconds.
- 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 |
| CRANKSHAFT POSITION SENSOR CIRCUIT WIRING OR CONNECTORS |
| CRANKSHAFT POSITION SENSOR |
| CRANKSHAFT, TONE WHEEL OR FLEX PLATE |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDUR).
Diagnostic Test
1. DTC IS ACTIVEIgnition on, engine not running.
With the scan tool select View DTCs.
Record the related Freeze Frame data.
Start the engine and allow it to reach operating temperature.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.
NOTE: If the DTC does not reset it may be necessary to test drive the vehicle.
Is the status Active for this DTC?
Yes
- Go To 2
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
2. CRANKSHAFT POSITION SENSOR CIRCUIT WIRING OR CONNECTORS
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Crankshaft Position Sensor and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Inspect the Crankshaft Position Sensor for conditions such as loose mounting screws, damage, or cracks.
Were any problems found?
Yes
- Repair as necessary.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).
No
- Go to 3
3. CRANKSHAFT POSITION SENSOR IRREGULAR SIGNAL
Turn the ignition off.
Using a lab scope and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the Crankshaft Position Sensor harness connector.
Ignition on, engine not running.
Wiggle the related wire harness and lightly tap on the Crankshaft Position Sensor while monitoring the lab scope screen.
Start the engine.
Monitor the Crankshaft Position Sensor signal on the lab scope screen.
Were any Crankshaft Position Sensor signals irregular or missing?
Yes
- Go to 4
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
4. CRANKSHAFT, TONE WHEEL OR FLEX PLATE
Turn the ignition off.
Remove the Crankshaft Position Sensor.
Inspect the Crankshaft Position Sensor and mounting area for any condition that would result in an incorrect signal, such as damage, foreign material, or excessive movement.
Were any problems found?
Yes
- Repair as necessary in accordance with the Service Information.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).
No
- Go To 5
5. CRANKSHAFT POSITION SENSOR
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Crankshaft Position Sensor and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Were any problems found?
Yes
- Repair as necessary.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).
No
- Replace the Crankshaft Position Sensor.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).