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Lexus CT 200h: Disabled due to loose contact
Just when ARBÖ's most experienced breakdown technician was behind the wheel, a Lexus CT 200h broke down on the motorway. The next breakdown occurred while troubleshooting because the clues displayed by the diagnostic device were misleading.
Lexus CT 200h: Disabled due to loose contact
When Gottfried Moser, technical training manager at ARBÖ, was driving a Lexus CT 200h on the highway from Linz to Salzburg, the EOBD error light suddenly lit up on the dashboard. “Since the lamp wasn’t flashing, which would indicate a possible ignition misfire, I drove on and wanted to read out the error later in the workshop with a diagnostic device,” says Moser. However, the breakdown expert didn't get that far because after about five more kilometers the message “Check Hybrid System” appeared on the display. “The vehicle went into emergency mode and I had to drive onto the hard shoulder,” said Moser. Conclusion: After switching off the engine, it could no longer be started and the ARBÖ expert had to call the in-house cavalry for help. After further unsuccessful attempts to start, the hybrid Lexus was finally towed into the workshop.
That's where our new diagnostic thriller began:
1. The error was read using an original Lexus diagnostic device and the crankshaft sensor was determined to be the cause of the breakdown.
2. After replacing the sensor and clearing the error, the car started.
3. After a few kilometers on the motorway, the breakdown process was repeated and the vehicle had to be parked at the hard shoulder again. It was necessary to tow it to the workshop again because the “Check Hybrid System” error can only be detected with a diagnostic device
or deleted by disconnecting the battery.
4. Again the crankshaft sensor was saved as an error in the error memory. However, the ARBÖ technician no longer trusted the diagnosis and began recording signals.
5. Result: Not the crankshaft sensor, but the camshaft sensor turned out to be the actual source of the error.
6. Gottfried Moser: “After a careful visual inspection, I found that the connector tab on the camshaft sensor did not exert enough pressure on the connections, which resulted in a loose contact.”
CONCLUSION
The loose contact was also the cause of the incorrect display on the diagnostic device, because if the camshaft sensor fails for a short time, the control unit does not evaluate the error correctly and sets the wrong error DTC P0335, which incorrectly points the suspicion to the crankshaft sensor.