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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 370 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P1336: Crankshaft System Variation Not Learned >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Perform the crankshaft position system variation learn procedure. See CRANKSHAFT POSITION SENSOR  under PROGRAMMING. Is the action complete? If yes, go to step  4. If no, go to next step.
  3. If the crankshaft position system variation learn procedure cannot be performed successfully, check for a damaged reluctor wheel, excessive crankshaft runout, damaged crankshaft, interference in the signal circuit of the CKP sensor, or ECT is less than 158°F (70°C). DTC will also set when ignition switch is left in ON position until battery is drained. If PCM power was disconnected with ignition ON, it may erase the stored value and set DTC P1336. Repair as necessary. After repairs, go to next step.
  4. Clear the DTCs with scan tool. Turn ignition off. Start engine. Operate vehicle within the Conditions For Running DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  5. Observe the stored information, Capture Info with scan tool. Does scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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