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• When Monitored: • Set Condition: Possible Causes (F856) 5-VOLT SUPPLY CIRCUIT OPEN (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND (K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (K44) CMP SIGNAL CIRCUIT OPEN (K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND (K44) CMP SIGNAL CIRCUIT SHORTED TO (F856) 5-VOLT SUPPLY TONE WHEEL/PULSE RING CAMSHAFT POSITION SENSOR 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 CAMSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE Install Miller Special Tools #8815 and #8815-1 to perform diagnosis. Using a lab scope, probe the (K44) CMP Signal circuit in the appropri- WARNING: When the engine is operating, do not stand in direct 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 9 - 384 ENGINE ELECTRICAL DIAGNOSTICS LX |