VSC TRAC/ VSC OFF & Check Engine Light on 2001 4Runner
in [Toyota Trucks]
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From: SMS on 10 Sep 2009 00:38 I guess this is the month for the check engine light in our Toyotas. Today, in my 2001 4Runner, the Check Engine Light, the VSC Off and the VSC Trac lights all came on at the same time. The OBD Code is P1135, which apparently is "A/F ratio sensor". How could this be related to the VSC lights?
From: Ray O on 10 Sep 2009 01:24 "SMS" <scharf.steven(a)geemail.com> wrote in message news:4aa88273$0$1587$742ec2ed(a)news.sonic.net... >I guess this is the month for the check engine light in our Toyotas. > > Today, in my 2001 4Runner, the Check Engine Light, the VSC Off and the VSC > Trac lights all came on at the same time. > > The OBD Code is P1135, which apparently is "A/F ratio sensor". How could > this be related to the VSC lights? We had the same problem with the O2 sensor in our Avalon. Fixed the O2 sensor and the VSC and Trac lights turned off. My guess is that the throttle retarding function for the VSC/Trac uses the signal from the O2 sensor or air/fuel sensor when cutting fuel. -- Ray O (correct punctuation to reply)
From: SMS on 10 Sep 2009 11:34 Ray O wrote: > "SMS" <scharf.steven(a)geemail.com> wrote in message > news:4aa88273$0$1587$742ec2ed(a)news.sonic.net... >> I guess this is the month for the check engine light in our Toyotas. >> >> Today, in my 2001 4Runner, the Check Engine Light, the VSC Off and the VSC >> Trac lights all came on at the same time. >> >> The OBD Code is P1135, which apparently is "A/F ratio sensor". How could >> this be related to the VSC lights? > > We had the same problem with the O2 sensor in our Avalon. Fixed the O2 > sensor and the VSC and Trac lights turned off. > > My guess is that the throttle retarding function for the VSC/Trac uses the > signal from the O2 sensor or air/fuel sensor when cutting fuel. From reading other people's experience with the same problem, some people are saying the 02 sensor and some are saying the A/F Ratio sensor. Are these the same thing?
From: Ray O on 10 Sep 2009 12:39 "SMS" <scharf.steven(a)geemail.com> wrote in message news:4aa91c51$0$1636$742ec2ed(a)news.sonic.net... > Ray O wrote: >> "SMS" <scharf.steven(a)geemail.com> wrote in message >> news:4aa88273$0$1587$742ec2ed(a)news.sonic.net... >>> I guess this is the month for the check engine light in our Toyotas. >>> >>> Today, in my 2001 4Runner, the Check Engine Light, the VSC Off and the >>> VSC Trac lights all came on at the same time. >>> >>> The OBD Code is P1135, which apparently is "A/F ratio sensor". How could >>> this be related to the VSC lights? >> >> We had the same problem with the O2 sensor in our Avalon. Fixed the O2 >> sensor and the VSC and Trac lights turned off. >> >> My guess is that the throttle retarding function for the VSC/Trac uses >> the signal from the O2 sensor or air/fuel sensor when cutting fuel. > > From reading other people's experience with the same problem, some people > are saying the 02 sensor and some are saying the A/F Ratio sensor. Are > these the same thing? The air/fuel, or "A/F" sensor, and the O2 sensor basically perform the same function, which is to tell the vehicle engine computer whether the ratio of fuel to air is rich or lean. A/F sensors give a linear signal which tells the vehicle's engine electronic control unit, or ECU exactly what the air fuel ratio is, while O2 sensors just tell the ECU whether the ratio is rich or lean. I believe that Toyota uses A/F sensors in some vehicles with CA emissions and O2 sensors in vehicles with Federal emissions. -- Ray O (correct punctuation to reply)
From: SMS on 10 Sep 2009 13:23 Ray O wrote: > "SMS" <scharf.steven(a)geemail.com> wrote in message > news:4aa91c51$0$1636$742ec2ed(a)news.sonic.net... >> Ray O wrote: >>> "SMS" <scharf.steven(a)geemail.com> wrote in message >>> news:4aa88273$0$1587$742ec2ed(a)news.sonic.net... >>>> I guess this is the month for the check engine light in our Toyotas. >>>> >>>> Today, in my 2001 4Runner, the Check Engine Light, the VSC Off and the >>>> VSC Trac lights all came on at the same time. >>>> >>>> The OBD Code is P1135, which apparently is "A/F ratio sensor". How could >>>> this be related to the VSC lights? >>> We had the same problem with the O2 sensor in our Avalon. Fixed the O2 >>> sensor and the VSC and Trac lights turned off. >>> >>> My guess is that the throttle retarding function for the VSC/Trac uses >>> the signal from the O2 sensor or air/fuel sensor when cutting fuel. >> From reading other people's experience with the same problem, some people >> are saying the 02 sensor and some are saying the A/F Ratio sensor. Are >> these the same thing? > > The air/fuel, or "A/F" sensor, and the O2 sensor basically perform the same > function, which is to tell the vehicle engine computer whether the ratio of > fuel to air is rich or lean. A/F sensors give a linear signal which tells > the vehicle's engine electronic control unit, or ECU exactly what the air > fuel ratio is, while O2 sensors just tell the ECU whether the ratio is rich > or lean. I believe that Toyota uses A/F sensors in some vehicles with CA > emissions and O2 sensors in vehicles with Federal emissions. Thanks. I see that now. It's a California model. Also I notice that beginning in 2001, the rear oxygen sensor changed on the 4Runner from a flange type to a screw-in type.
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