TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Visually inspect the related wire harness including the ground circuit. Look for any
chafed, pierced, pinched, or partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are
properly installed and the mounting bolt(s) are tight.
Refer to any TSBs that may apply.
Were any of the above conditions present?
All
Yes
→ Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Disconnect the CKP Sensor connector.
Ignition on, engine not running.
Measure the voltage on the (F855) 5-volt Supply circuit in the Sensor harness
connector.
Is the voltage between 4.5 and 5.3 volts?
All
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 POWERTRAIN VERIFICATION TEST VER - 5.
5
Turn the ignition off.
Carefully disconnect the Battery Ground cable.
Remove the Crankshaft Position Sensor.
Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive
movement.
Were any problems found?
All
Yes
→ Repair or replace the Tone Wheel/Flex Plate as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 6
6
NOTE: An intermittent condition in the Cam Position Sensor can cause the
P0339 to set.
Install the Crankshaft Position Sensor.
With the DRBIII
t lab scope probe and the Miller special tool #6801, backprobe the
(K44) CMP Signal circuit at the Sensor harness connector.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Ignition on, engine not running.
Wiggle the related wire harness and lightly tap on the Cam Position Sensor.
Observe the lab scope screen.
Start the engine.
Observe the lab scope screen.
Are there any irregular or missing signals?
All
Yes
→ Replace the Cam Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 7
129
DRIVEABILITY - NGC
P0339-CRANKSHAFT POSITION SENSOR INTERMITTENT —
Continued