- 1989 TOYOTA DIAGNOSTIC CODES HOW TO
- 1989 TOYOTA DIAGNOSTIC CODES CODE
- 1989 TOYOTA DIAGNOSTIC CODES TRIAL
- 1989 TOYOTA DIAGNOSTIC CODES FREE
If there is anything you would like to add about P0401, please feel free to add a comment below. By process of elimination, you can be relatively confident that the DPFE is at fault. If you aren’t sure you can tackle that, you can always test everything else first. The most challenging aspect is the DPFE sensor. Testing your EGR system is relatively easy to do.
1989 TOYOTA DIAGNOSTIC CODES HOW TO
Here’s an article from Autozone on how to test it with a vacuum gauge. Test the EGR Valve- A vacuum gauge will help you determine if the EGR valve itself has gone bad.Here’s a good article on how to do that from It Still Runs: How to Test DPFE Sensor. Check DPFE Sensor Voltage- If you are good with a voltage meter go ahead and test it.If it’s clogged you can get away with cleaning it and replacing it. If it’s cracked, you’ll need to get a new one. Check the EGR Tube- It’s a good idea to check the tube going to the EGR because it’s often the cause of P0401, easy to do, fast, and replacing it is very afToyotaable.Here are some of the most common fixes to help clear the P0401: That’s because the EGR valve is not always going to be the culprit. Most folks see P0401 Insufficient EGR flow, look up the price of an EGR valve, see how cheap it is and just throw a new one on. The good news with P0401 is that it rarely ever costs much money to fix, and it is usually pretty easy to get the problem, since it is right on top of the engine. Sensor Issue– The Differential Pressure Feedback- EGR sensor can go faulty and cause the EGR valve to stop operating properly and throw the code.For instance, if the motor is not running well enough to create sufficient vacuum to operate the EGR valve, than P0401 will often be thrown.
So, if you are encountering P0401 and other codes, the P0401 may be a symptom of larger problems. Vacuum Issues– The EGR valve relies on engine vacuum to operate.But, they certainly are the cause of P0401 often enough. EGR Valve Itself is Bad– The EGR valve itself is usually not going to be the place to start.Check the tube and see if it is cracked, clogged or otherwise damaged. This is especially true if you are experiencing P0401 right after doing some engine work. Alternatively, it can become bent or kinked. Blocked EGR Tube– The tube that carries the exhaust gases back to the motor may clog up over time.
1989 TOYOTA DIAGNOSTIC CODES CODE
It’ll sound almost like piston slap.ĭiagnosing what is causing the P0401 code in the Rav4 is typically not very tricky.
Digits five thru eight represent the vehicle trim level or series, engine, and frequently (but not always) transmission. The fourth digit represents the safety features on the vehicle. There are three main parts of the Rav4’s EGR system. The first three digits in the VIN correspond to the make, model, and manufacturer. The EGR system on a vehicle is responsible for recirculating exhaust gasses in order to lower the vehicles emissions output. Celica GT 1.8L 00-05 Chassis Code: ZZT230 Engine Code: 1ZZ-FE Celica GT-S 1. It has to do with the emissions system and stands for:
1989 TOYOTA DIAGNOSTIC CODES TRIAL
This technique will completely isolate your problem without having to do trial and error and it is the technique I use when repairing tv's, vcr's, home/car audio.P0401 is a common OBDII trouble code that’ll pop up in the Toyota Rav4. I also close the ignition switch after a cold engine and also after a warm engine and compare the resistance values with the factory service manual. Pulling the ECU (EFI computer) codes is the first thing I do to diagnosis a problem thereafter I reset the ECU to see if the same problems show up and if so I then take voltage measurements at each ECU wire both with the engine running and not and compare with the factory service manual. About half of the ECU codes stored on the first & second generation EFI Toyotas don't show a constant blinking check engine light therefore you must pull the ECU codes to see if a fault is registered.Īll 1980-1995 and including 1995 EFI equipped vehicle allow you to find engine and related faults by pulling the ECU (computer) codes without the need for a handheld OBDII diagnosis scanner, the sites listed below have the fault codes needed to pull the codes and the instructions on how to do it: