Question about 2003 Jeep Wrangler
320 Crankshaft position sensor reference signal cannot be found while the engine is cranking.
The wiring that feeds a signal from the crank position sensor to the computer should be checked first. Disconnecting and reconnecting the wiring connector may help. Without the right diagnostic equipment, it is difficult to determine if the sensor is at fault.
Posted on Sep 27, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
Engine control module (ECM) replacement
Crankshaft damper replacement
CKP sensor replacement
Any engine repairs which disturb the crankshaft to CKP sensor relationship
Important: The scan tool monitors certain component signals to determine if all the conditions are met to continue with the CKP system variation learn procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
CKP sensor activity--If there is a CKP sensor condition, refer to the applicable DTC that set.
Camshaft position (CMP) signal activity--If there is a CMP signal condition, refer to the applicable DTC that set.
Engine coolant temperature (ECT)--If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.
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