2003 Toyota Highlander Trouble Diagnosis For Dtc P0135 Manual
- 2003 Toyota Highlander Trouble Diagnosis For Dtc P0135 Manual 10
- 2003 Toyota Highlander Trouble Diagnosis For Dtc P0135 Manual Transmission
- 2003 Toyota Highlander Trouble Diagnosis For Dtc P0135 Manual 2017
Pulling a P0135 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) code means you’re dealing with a possible oxygen sensor heater element and/or associated components in this circuit. This article will attempt to provide a game plan for diagnosing a vehicle with this code.
I’ve found through my research that all of the car manufacturers appear to have similar logic on how these systems may work, but I always start my process by looking to see if any feed or ground issues may exist in the circuit. A quick review of the schematic for this system shows a feed supply, A/F fuse, A/F relay, A/F sensor heater and ECM.
Possible causes of OBD code P0135 Toyota A code P0135 Toyota may mean that one or more of the following has happened: O2 Heater element resistance is high Internal short or open in the heater element O2 heater circuit wiring high resistance open or short to ground in the wiring harness. Aug 13, 2011 My 2003 Highlander 4 cylinder has trouble codes P0141 and P0161 how do I troubleshoot the O2 heater circuit? - Answered by a verified Toyota Mechanic.
This month’s diagnostic journey begins with a Toyota product. (See sidebar below for information on a training video that offers a good perspective into the operation of these Toyota systems.)
2003 Toyota Highlander Trouble Diagnosis For Dtc P0135 Manual 10
Feb 11, 2014 This month’s diagnostic journey begins with a Toyota product. (See sidebar below for information on a training video that offers a good perspective into the operation of these Toyota systems.) Our subject vehicle is a 2003 Toyota Highlander 3.0L. This vehicle is set to go to emissions testing and needs the oxygen sensor heater monitor to. P0171 Code - Toyota. System Too Lean (Bank 1); Oftentimes, this trouble code is accompanied by an P0174. Or even an exhaust leak before the first O2 sensor€¦isn't engine trouble code diagnosis fun? Consult your Toyota's manual for its exact location, which is specific to model. If that doesn't do it, it's probably time to enlist the.
Our subject vehicle is a 2003 Toyota Highlander 3.0L. This vehicle is set to go to emissions testing and needs the oxygen sensor heater monitor to run and pass prior to testing. Ford escape 2007 review.
We’ll approach this process in a logical format; the Toyota Techstream software as well as the Pico lab scope will be used. It must be clear upon starting this process that the correct sensor be identified; there are two sensors at the front of the engine. One of the sensors is in plain view and can be easily mistaken as the faulty sensor.
I have provided two photos (Photos 1 and 2) that show the sensors as they appear on this subject vehicle. The sensor closest to the engine firewall is A/F bank 1 sensor 1. We’ll use the sensor that was noted near the radiator as the one to compare with our suspect sensor. The malfunction thresholds have been noted as the heater current being too low or too high. The Toyota Techstream software will first be used to confirm our trouble code information. We will also review the voltage and current information for both our heater circuits.
A Techstream snapshot was performed and Figure 1 notes the activity on A/F B2S1; there was no activity noted on A/F B1S1. The tool also indicated that there was a P0135 stored in the controller’s memory. I decided that I would first review the activity on A/F B2S1, as this would provide a base for known-good.
Figures 2 and 3 from the Pico lab scope show the voltage available at the feed side of the heater circuit as well as the switching activity of the current. The voltage is to be checked on the feed side and the control side of the oxygen sensor heater circuit to get the full electrical picture.
Figure 2 shows the feed side voltage as well as the switching current in the heater circuit. The voltage on the other side of the heater circuit was checked and found to be switching as well. This denoted known-good activity. Figure 2 indicates that there is a good feed, relay and wiring up to the heater circuit in one visual.
We will now take a look at our suspect sensor A/F B1S1. Figure 3 shows feed voltage going into the heater circuit and current flow in the heater circuit. There is voltage to the heater circuit; the wiring and relay are good up to that point. Note that there is no current flow in the heater circuit.
It’s now time to check voltage activity on the control side of the circuit; Figure 4 shows this activity. Note that the ECM attempts to switch the voltage; the voltage is at a level of 4 volts. The switching then stops. There was never any current flow in the circuit. This implies an 8-to-10-volt drop across the heater element. The dynamic resistance of the heater element was too high.
The oxygen sensor was replaced and the system is now working as designed. This Pulling Codes case is now closed.
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2003 Toyota Highlander Trouble Diagnosis For Dtc P0135 Manual Transmission
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System Too Lean (Bank 1); Oftentimes, this trouble code is accompanied by an P0174
This is one of the most common trouble codes in V-6 and larger engines. P0171 is a 'System Too Lean (Bank 1),' which is triggered by the first exhaust oxygen (02) sensor (aka upstream 02 sensor) on the 'Bank 1' side of the engine (designated as whichever side has cylinder number one).
Nearly all Toyota gasoline engines strive for a 14.7:1 air to fuel mix, and they accomplish this goal by measuring the amount of oxygen in the exhaust stream using O2 sensors. The engine control module (ECM, sometimes referred to as a powertrain control module) uses readings from the O2 sensor to adjust the air/fuel mix for optimal efficiency. When the mixture has too much oxygen, the ECM adds more fuel to the engine.
If the oxygen readings don't change in a manner corresponding fuel mixture changes - i.e. the engine is running richer, but the oxygen sensor(s) aren't measuring any change in oxygen levels - the ECM will register a P0171 OBD II code. Quite often P0171 is triggered in tandem with P0174, which comes on when the Bank 2 sensor detects too much oxygen in the exhaust.
Troubleshooting P0171 Code
Oftentimes, a P0171 means that your Toyota is having trouble with a dirty or faulty mass air flow (MAF) sensor, or a vacuum leak downstream of the MAF sensor (perhaps in the PCV line or in the valve itself). Of course, this code can also signify a bad O2 sensor in bank 1.
Additionally, it's rare (but still possible) that a P0171 code can be tripped by a plugged fuel injector, by a dirty fuel filter causing low fuel pressure, or even an exhaust leak before the first O2 sensor€¦isn't engine trouble code diagnosis fun?
- Most of the time, the best way to respond to a P017 is to try cleaning the MAF sensor and the lines running to and from it. This will often resolve this issue.
- When you clean the MAF sensor, be sure to inspect all of the lines including the vacuum and PCV hoses. Look for kinks, cracks, etc. and replace the lines as needed. Additionally, be sure to check all of the connections and hoses on the air intake and check for intake manifold leaks.
- Finally, it's never a bad idea to change your air and fuel filter, especially if they're just about due for replacement anyways.
If cleaning the MAF sensor and inspecting the lines doesn't solve the problem, it may be time to replace the O2 sensor on bank 1. Consult your Toyota's manual for its exact location, which is specific to model. If that doesn't do it, it's probably time to enlist the help of a professional.