The EA2111 engine crankshaft timing pulley and crankshaft spline groove are worn, resulting in weak acceleration and high fuel consumption. How can this situation be repaired?
EA2111 engine troubleshooting process
Connect the VAS5051B diagnostic instrument, enter the gateway list, query the entire system fault code memory, found in the 01-engine control system within the following chart fault code
Clear the fault code, idle speed operation is normal but an acceleration fault code reappears, indicating that the fault is not an episodic fault but a real-life fault.
The probable cause of this code is：
- Camshaft position sensor G40 wire fault
- Camshaft position sensor G40 fault Camshaft variable timing adjustment is not working properly Air distribution timing system fault Camshaft position sensor G40 target wheel fault.
Based on the above analysis, carry out fault diagnosis and troubleshooting:
- Use 5051B to check the waveforms of G28 and G40.
Waveforms of a faulty car (G28 missing tooth signal corresponds to two consecutive G40 signal peaks)
- Normal car waveform (G28 missing tooth signal corresponds to two consecutive G40 signal peaks and valleys).
By examining the sensor waveforms of G28 and G40, it is shown that there is indeed a problem with the engine timing of this vehicle.
Data comparison: The normal car 94 group of the second area at idle has been in the open position, and the fault car data is in the closed position. - The camshaft adjustment solenoid valve for the implementation of elements of self-diagnosis is normal, N205 solenoid resistance of 142, in line with the standard.
- Considering the oil pressure will affect the implementation effect of the mechanical valve of the gas distribution phase, measure the oil pressure.
- Measurement results are in line with the maintenance manual standard values. The above test results indicate that the variable camshaft timing adjustment mechanism can work properly.
- Check the engine timing, there is no obvious abnormality, disassembly of the camshaft and crankshaft pulley found that the crankshaft pulley spline groove becomes wider, resulting in the pulley and the crankshaft producing a phase difference between the failure.
EA2111 Engine Failure Analysis
The spline groove of the shaft pulley becomes wider, resulting in a phase difference between the pulley and the crankshaft, which causes the phase relationship between G28 and G40 to be misaligned, and the engine computer receives an erroneous signal and generates a fault code.
Troubleshooting methods
Replace the engine crankshaft and crankshaft pulley.
- The G28 and G40 phase relationship is the root cause of the 16400 fault code.
- The crankshaft pulley spline groove damage widening failure point is relatively hidden and must be removed from the crankshaft pulley can be seen, to remind you that the failure point is not finalized before all possible failure points have the possibility of triggering a failure, so in the process of troubleshooting must be considered comprehensively.
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