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P0339-CRANKSHAFT POSITION SENSOR INTERMITTENT (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: 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 - 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) 2. CHECKING CRANKSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE Turn the ignition off. With a lab scope probe and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the Sensor WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands Observe the lab scope screen. Start the engine. Observe the lab scope screen. Are there any irregular or missing signals? Yes >> Go To 3 No >> Go To 8 HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 415 |