The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.
When the throttle position sensor fails, the engine's computer tends to overcompensate with fuel, leading black exhaust coming from the tailpipe. There is a strong possibility of engine misfires, and the check engine light will come on.
Throttle position sensors can also develop "dead spots," or certain places along the throttle curve where it doesn't get a reading. When this happens, the above symptoms can occur but then stop when you further press or let off the gas pedal.
In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.
A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.
When diagnosing the non-functioning cruise control in a 1999 Volvo C70, it's crucial to adopt a systematic approach that begins with the most accessible components. Start by inspecting the turn signal wiring and the cruise control switches located on the turn signal stalk, as these are often the culprits behind cruise control failures. Next, examine the throttle servo, which is encased in a black rubber bellows, along with the associated vacuum lines for any signs of wear or damage, as these can significantly impact functionality. Remember to ensure that the engine is running when attempting to engage the cruise control, as it will not activate if the engine is off. Additionally, check that your vehicle is traveling at a speed of at least 30 kmph (19 mph), since the cruise control system will disable itself if the speed drops below this threshold. By following these initial steps, you can effectively narrow down the potential causes of the issue and take the first steps toward restoring your cruise control system.
When considering the urgency of fixing the non-functioning cruise control in a 1999 Volvo C70, it's essential to recognize that while it may not seem like an immediate emergency, the implications of neglecting this issue can be significant. A malfunctioning cruise control system can lead to increased driver fatigue during long trips, as the driver must maintain constant pressure on the accelerator, which can detract from overall driving comfort and safety. Moreover, the cruise control system may be indicative of underlying problems within the vehicle's systems, potentially affecting performance and safety. Ignoring this symptom could lead to more severe issues down the line, resulting in costly repairs and unexpected breakdowns. Therefore, addressing the cruise control problem promptly not only enhances the driving experience but also ensures that the vehicle operates efficiently and safely, making it a worthwhile DIY project for any Volvo owner.
See what others are asking about their Volvo C70. Get answers from RepairPal's community of auto experts and enthusiasts.
Read about related problems experienced by other Volvo C70 drivers like you.
