Circuit Description
The Crankshaft Position (CKP) sensor sends a reference signal to the Vehicle Control Module (VCM) in order to indicate the crankshaft position and RPM. The VCM uses this information in order to determine when to pulse the ignition coil, the fuel injectors and the control ignition timing. The DTC P0339 is a type B DTC.
Conditions for Setting the DTC
The following conditions will set the DTC:
- The MAF sensor is at least 5 g/s.
- The change in the calculated engine speed is at least 1000 RPM.
Action Taken When the DTC Sets
The VCM will turn ON the MIL after 2 consecutive driving cycles with the fault active.
Conditions for Clearing the MIL/DTC
A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (the coolant temperature has risen 40°F from the start-up coolant temperature and the engine coolant temperature exceeds 160°F during that same ignition cycle) or the scan tool clearing feature has been used.
Diagnostic Aids
A poor connection, a rubbed through wire insulation, or a wire that is broken inside the insulation may cause an intermittent problem.
Thoroughly check any circuitry that is suspected of causing the intermittent condition. Check for the following conditions:
| • | Backed out terminals |
| • | Improper mating |
| • | Broken locks |
| • | Improperly formed or damaged terminals |
| • | Poor terminal to wiring connections |
| • | Physical damage to the wiring harness |
Inspect the face of the CKP sensor for metal shavings. This could result in an intermittent DTC P0339
Refer to Intermittents in Intermittent Conditions .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Checks the ignition feed circuit to the Crankshaft Position sensor
-
Checks the duty cycle of the Crankshaft Position sensor
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing the DTCs, use the scan tool to record the Freeze Frame and the Failure Records for reference. This data will be lost when the Clear Info function is used. Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
2 | Does the vehicle start and continue to run? | -- | Go to Diagnostic Aids | |
Is the test lamp on? | -- | |||
4 | Connect the test lamp between the CKP sensor ignition feed and the CKP sensor Low circuit. Is the test lamp on? | -- | ||
Is the duty cycle within the specified range? | 40 %-60 % | |||
6 | Repair the open or short to ground in the CKP sensor ignition feed circuit. Refer to Wiring Repairs in Engine Electrical. Is the action complete? | -- | -- | |
7 | Check the CKP sensor Low circuit for an open. Was a problem found? | -- | ||
8 |
Is the voltage above the specified value? | 10.0 V | ||
9 | Check for an open in the CKP sensor (3X) signal circuit or an open in the CKP sensor Low circuit. Was a problem found? | -- | ||
10 |
Notice: In order to avoid damaging the replacement three-way catalytic converter, correct the engine misfire or mechanical fault before replacing the three-way catalytic converter. Replace the CKP sensor. Refer to Crankshaft Position (CKP) Sensor Replacement . Is the action complete? | -- | -- | |
11 | Repair as necessary. Is the action complete? | -- | -- | |
12 | Replace the VCM. Important: If the VCM is faulty, reprogram the VCM. Refer to VCM Replacement/Programming . Is the action complete? | -- | -- | |
13 |
Does the scan tool indicate that this diagnostic ran and passed? | -- | ||
14 | Using the scan tool, select the Capture Info and the Review Info. Are any DTCs displayed that have not been diagnosed? | -- | Go to The Applicable DTC Table | System OK |
