During the data consistency test of heavyduty vehicle remote terminal, the  maximum value calculation of crosscorrelation function was used to correct data delay between the heavyduty vehicle online monitoring platform and OBD instrument. The delay degrees of data items such as vehicle speed, engine speed, intake air flow, fuel flow and NO_x between them were not exactly the same. And all R² correlation coefficients of corresponding data sequences after the correction were larger than 0.9. The noise signal with the SNR of -10 dB were introduced into the platform data and the results were compared with the original data. After the introduction of noise, all the data delays of items between the platform and OBD became the same.