P0339-CRANKSHAFT POSITION SENSOR INTERMITTENT
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
While cranking the engine and with the engine running.
- Set Condition:
When the CKP Sensor failure counter reaches 20. One Trip Fault. Three good trips to turn off the MIL.
| Possible Causes |
| (F855) 5-VOLT SUPPLY CIRCUIT OPEN |
| (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND |
| (K24) CKP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE |
| (K24) CKP SIGNAL CIRCUIT OPEN |
| (K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND |
| (K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT |
| CRANKSHAFT POSITION SENSOR |
| TONE WHEEL/PULSE RING |
| PCM |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1.ACTIVE DTCIs 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)
2.CHECKING CRANKSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE
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.
Are there any irregular or missing signals?
Yes
- Go To 3
No
- Go To 8
3.WIRE HARNESS INSPECTION
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 4
4.(F855) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND
Is the voltage between 4.5 and 5.2 volts?
Yes
- Go To 5
No
- Repair the open or short to ground in the (F855) 5-volt Supply circuit. Use Miller special tool #8815 when checking for an open circuit to prevent PCM harness connector terminal damage.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.TONE WHEEL/FLEX PLATE INSPECTION
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 6
6.CHECKING CAMSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE
NOTE: An intermittent condition in the Cam Position Sensor can cause the P0339 to set.
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.
Are there any irregular or missing signals?
Yes
- Replace the Cam Position Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 7
7.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)
8.(K24) CKP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Is the voltage above 0 volts?
Yes
- Repair the short to battery voltage in the (K24) CKP Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 9
9.(K24) CKP SIGNAL CIRCUIT OPEN
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.
Is the resistance below 1.0 ohm?
Yes
- Go To 10
No
- Repair the excessive resistance in the (K24) CKP Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
10.(K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND
Does the resistance ever go below 100 ohms?
Yes
- Repair the short to ground in the (K24) Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 11
11.(K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT
Is the resistance below 5.0 ohms?
Yes
- Repair the short between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 12
12.PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Were there any problems found?
Yes
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Replace and program the Powertrain Control Module per Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)