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DO THE EXTRA TEST BEFORE YOU JUMP THE GUN
| 题名： | DO THE EXTRA TEST BEFORE YOU JUMP THE GUN |
| 正文语种： | eng |
| 作者： | SCOTT SHOTTON |
| 摘要： | Occasionally, we all get one of those vehicles that throws us a curve-ball. When this happens, the best way to deal with it is to take a breath, step back for a moment, and reassess the situation. Think logically, decide what piece of information you need to know, and then jump back in with the additional test to find your answer. This will help avoid a wild goose chase or going down the proverbial rabbit hole. This is one of those situations where I almost made the wrong call, stepped back to scratch my head, and jumped right back in with the extra tests needed to be completely accurate with my diagnosis.The vehicle in question was a 2006 Nissan Xterra equipped with a VQ40DE 4.0-liter engine and manual transmission and is rear wheel drive (Figure 1). It was towed into the shop because it had stalled while driving and now exhibits a "crank/no-start" condition. The customer stated that there were no lamps lit up on the dash before this problem occurred. Relatively quickly the technician diagnosed that the timing chain had jumped teeth. A timing chain replacement was approved by the customer and the timing cover was removed. The technician's diagnosis was correct, because none of the plastic from the timing chain guides was existent. The lack of tension allowed the timing chain to jump teeth. This is nothing new to us as technicians. The service advisor sold the job, with all the appropriate extras, and shipped it off to the technician. The technician completed the repair and then the vehicle exhibited new symptoms. First, the vehicle intermittently "runs poorly." Second, the MIL is illuminated and the ECM has stored two DTCs: P0011 - "INT/V TIM CONT-B1" and P0021 - "INT/V TIM CONT-B2" |
| 出版年： | 2021 |
| 期刊名称： | Motor age |
| 卷： | 140 |
| 期： | 5 |
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