2001 Toyota Land Cruiser off-road vehicle engine self-diagnosis system fault indicator check, fault code reading and removal methods and maintenance precautions.
This article refers to the address: http://
1. Introduction to fault self-diagnosis system
The engine of the Toyota Land Cruiser off-road vehicle is controlled by the ECM (Engine Control Module). The ECM has a fault self-diagnostic system that complies with the second generation of on-board diagnostic system (OBD-II) standards.
The ECM self-diagnosis system can continuously detect the operation of the emission control system, and when the system fails, it can diagnose the fault in time. The fault indicator will illuminate if a failure of the emission control system affects the vehicle's emissions, or if the ECM fails. If the ECM memory stores a fault code due to a system or component failure, the fault indicator will also illuminate. If the fault does not reappear in three consecutive trips, the fault indicator will go out, but the fault code will be stored in the ECM memory.
The ECM self-diagnostic system also has the ability to record and store frozen data. Freezing data is the operating data of the ECM when the engine fails. If the fault code detected by the self-diagnostic system exceeds one, only the engine operating condition data at the time of the first fault occurrence is recorded. Freezing data is useful for determining the conditions at which a fault occurs and thereby diagnosing the fault.
The trouble code can be read using the OBD-II scanner or the Toyota handheld scanner. When reading the fault code, connect the scanner to the No. 3 data communication connector (located on the left side of the steering column below the instrument panel). The scanner can also read frozen data and clear the trouble code.
2, fault diagnosis procedures
(1). Fault indicator check
Before reading the fault code, first check the fault indicator to determine if the fault indicator is working properly and whether the fault code is stored in the self-diagnostic system. The fault indicator is checked as follows:
1. Turn on the ignition switch, do not start the engine, the fault indicator on the instrument panel should be lit. If the fault indicator does not illuminate, check the wiring between the combination meter's lamp circuit and the fault indicator to the ECM.
2. Start the engine and the fault indicator should be off. If the fault indicator is always on or flashing while the engine is running, it indicates that the fault has been detected by the self-diagnostic system and the fault code should be read. If the fault code is not read, check the short circuit fault between the fault indicator and the ECM line and the ground.
(2). Read the fault code
The fault code has two read modes, normal mode and detection mode.
The normal mode is to read the fault code from the ECM without starting the engine, and the detection mode is to let the car run under the condition that the simulated fault code is set, and the fault code is detected at the same time. The detection mode is more capable of detecting faults. The detection mode can diagnose faulty circuit connections or other intermittent faults, while normal mode detection is more difficult.
1. Read the trouble code program in normal mode
a. Connect the scanner to the No. 3 data communication connector, turn on the ignition switch, but do not start the engine. Operate the scanner as required by the scanner manual to read the trouble code and freeze the data.
b. If the scanner displays “UNABLE TO CONNECT TO VEHICLEâ€, check the No. 3 data communication connector.
c. Record the displayed fault code and freeze data. The meaning of the fault code is shown in Table 1.
d. If the car is faulty but the fault code is not read, the fault can be diagnosed according to the fault symptom.
e. After the fault is eliminated, the fault code should be cleared, and then the road test is performed on the car to confirm that the fault has been eliminated and the fault code is no longer established.
2. Read the fault code in the detection mode
a. Confirm that the battery voltage is normal, tighten the parking brake, place the shift lever in the P (parking) or N (neutral) position, close the A/C and ignition switch, and confirm that the throttle is fully closed. Connect the scanner to the No. 3 data communication connector. Turn the ignition on and do not start the engine. Turn on the scanner switch.
b. Convert the scanner from normal mode to detection mode. If the fault indicator flashes, the scanner enters detection mode. Start the engine and if there is no fault code, the fault indicator will go out.
c. Simulate the condition when the fault occurs, drive the car, record the fault code and freeze data displayed by the scanner. If the fault exists but there is no fault code, you can troubleshoot according to the fault symptom.
d. If there is a fault code, determine the meaning of the fault code according to Table 1, and perform corresponding fault diagnosis.
e. After the fault is eliminated, the fault code should be cleared, and then the road test is performed on the car to confirm that the fault has been eliminated.
(3). Clear the fault code
1. Use the scanner to clear the fault code and freeze data as described in the manual.
2. The fault code and freeze data can also be cleared by unplugging the EFI fuse (20A) and the throttle fuse (15A). EFI fuses and throttle fuses are located on the driver's side of the front of the engine compartment.
3. It is also possible to clear the fault code and freeze data by removing the battery negative cable, but other memory contents (clock, radio, anti-theft, seat, etc.) will be cleared at the same time and must be reset.
3, matters needing attention
(1). The trouble code can be read in the normal mode using the OBD-II scanner or the Toyota handheld scanner. To read the trouble code in detection mode, only the Toyota Handheld Scanner can be used.
(2). If using Toyota handheld scanner to read the fault code or freeze data, when the ignition switch is turned from ON to ACC or OFF position, or when the scanner switches from normal mode to detection mode, all fault codes and freeze data will be All are cleared. Therefore, do not convert the read mode until all fault codes and frozen data have been recorded.
(3). When troubleshooting, if you need to use a multimeter, you should use a digital multimeter with an internal resistance of 10MΩ or more.
(4). When troubleshooting, avoid contact with the ECM terminal by hand or other metal tools to prevent static damage to the ECM.
(5). For vehicles with an engine brake system, if the ECM is replaced, the ECM must be programmed with the ignition key code, otherwise the engine will not start.
Heavy duty backup cameras are specially designed for truck, trailer, cargo, bus, van, pickup. Generally come with infrared.High quality image with wild viewing angle. IP68 waterproof rating. Low power consumption design.
- [Car Backup Camera with IR LED]Really help you checking blind spots in darkness make you parking and reversing more convenient
- [Waterproof IP68 Rating]Work great in all weathers, you don't need to worry about parking a car in rainy day
- [Low power consumption design]Consume less than 50 mA, Don't worry about heat will affect the backup camera's service life,It can be used for a long time.Operating temperature in -4℉ to 176℉
- [ Length wires optional]We offer 10M,15M,20M LONGER WIRES to ensure Rear View Camera can perfect fit for most types of vehicles
-
[Customer Service]30-Day Money Back Guarantee; 12 Month Replacement Warranty And Lifetime Support .
Backup Camera For Truck,Heavy Duty Backup Camera,Van Backup Camera,Heavy Duty Mental Backup Camera
Shenzhen Sunveytech Co.,LTD , https://www.sunveytech.com