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P1391-INTERMITTENT LOSS OF CMP OR CKP (CONTINUED) 3. CMP WIRE HARNESS INSPECTION Visually inspect the related wire harness. 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 mount- Refer to any TSB that may apply. Were any of the above conditions present? Yes >> Repair as necessary Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 4 4. TONE WHEEL/PULSE RING INSPECTION Turn the ignition off. Remove the Camshaft Position Sensor. Inspect the Tone Wheel/Pulse Ring for damage, foreign material, or excessive movement. Were any problems found? Yes >> Repair or replace the Tone Wheel/Pulse Ring as necessary. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 5 5. CAMSHAFT POSITION SENSOR If there are no possible causes remaining, view repair. Repair Replace the Camshaft Position Sensor. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 6. CHECKING CKP SIGNAL WITH THE SCAN TOOL LAB Turn the ignition off. With the scan tool as a Dual Channel Lab Scope and the Miller special tool #6801, backprobe the (K24) CKP Signal WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hand Observe the lab scope screen. Are there any irregular or missing signals? Yes >> Go To 7 No >> Go To 10 9 - 1958 ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10 DR/DH |