Chevrolet Aveo 2009 Service Manual page 7

Document ID: 1653500
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2009 Chevrolet Aveo Aveo, Wave, G3, Barina (VIN S/T) Service Manual
Crankshaft Position System Variation Learn
Important: If the crankshaft position variation learn procedure has not learned, a false misfire
could be detected and DTC P0300 may set. If sent here from DTC P0300, proceed with the
crankshaft position variation learn procedure.
1. Monitor the engine control module (ECM) for DTCs with a scan tool. If other DTCs are set,
except DTC P0300, or P1336, refer to
applicable DTC.
2. Select the crankshaft position variation learn procedure with a scan tool.
3. The scan tool instructs you to perform the following:
3.1. Accelerate to wide open throttle (WOT).
3.2. Release throttle when fuel cut-off occurs.
3.3. Observe fuel cut-off for applicable engine.
3.4. Engine should not accelerate beyond calibrated RPM value.
3.5. Release throttle immediately if value is exceeded.
3.6. Block drive wheels.
3.7. Set parking brake.
3.8. DO NOT apply brake pedal.
3.9. Cycle ignition from OFF to ON.
3.10. Apply and hold brake pedal.
3.11. Start and idle engine.
3.12. Turn A/C OFF.
Vehicle must remain in Park or Neutral.
The scan tool monitors certain component signals to determine if all the conditions are met to
continue with the procedure. The scan tool only displays the condition that inhibits the
procedure. The scan tool monitors the following components:
• Crankshaft position (CKP) sensors activity--If there is a CKP sensor condition, refer to
the applicable DTC.
• Camshaft position (CMP) signal activity--If there is a CMP signal condition, refer to the
applicable DTC.
• 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.
4. Enable the CKP system variation learn procedure with the scan tool and perform the
following:
Important: While the CKP variation learn procedure is in progress, hold the throttle at
WOT for 5 fuel-cutoffs. The learn procedure must determine there has been 5 fuel-cutoffs
to properly perform the test.
• Accelerate to WOT.
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Repair Instructions
Diagnostic Trouble Code (DTC) List - Vehicle
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Engine Engine Controls and Fuel - 1.4L (L95)
Page 1 of 2
for the
7/6/2010