Ford repair professionals: Toyota Trouble codes?

Monday, April 2, 2012

Toyota Trouble codes?

Trouble codes also mean Error codes or Obd codes.Retrieved by Scan tool.
In this Toyota Trouble codes Section.
There are details mentioned about
Trouble codes General Information.
how to retrieve codes.
Where is Data link connector.The data link connector is the part to which the OBD scan tool is connected.
And How to Clear the Error codes.
And what What codes mean.

Refer each section for complete knowledge.
This details are for following Toyota car/Truck models.
Toyota Pick-ups, Land Cruiser, and 4 Runner car models.
Its for Year 1997 to Year 2000.

General Information:

The ECM contains a built-in, self-diagnosis system that detects troubles within the engine signal network. Once a malfunction is detected, the ECM may turn on the instrument panel Malfunction Indicator Lamp (MIL), if certain malfunction parameters are met.
By analyzing various signals, the ECM detects system malfunctions related to the operating sensors. The ECM stores the failure code associated with the detected failure until the diagnosis system is cleared.
The MIL on the instrument panel informs the driver that a malfunction has been detected. The light will go out automatically once the malfunction has been cleared.

Data Link Connector Location,Details & Diagram:---

Two Data Link Connectors (DLC) are normally used. A scan tool is connected to a DLC to read the data stream, capture Diagnostic trouble Codes (DTCs), read real-time operating information and even operate some of the vehicle's systems for testing. Most all of the modern vehicles will require a scan tool for efficient troubleshooting. The Data Link Connector designated DLC1 is located in the engine compartment. The Data Link Connector designated DLC3 is located in the interior of the vehicle, under the driver's side of the instrument panel.

See the diagram shown below:--

Location of the diagnostic connector

Fig. The DLC1 terminals are protected by a lid

Fig. The DLC1 is located in the engine compartment, on the side of the fuse block

Fig. The DLC3 is located under the driver's side of the instrument panel

Reading Codes:

The vehicles covered by this guide require the use of the Toyota's hand-held scan tool or an equivalent OBD II compliant scan tool.

Prepare the scan tool according to the manufacturer's instructions.

Connect the OBD II scan tool, to the DLC3 under the instrument panel.

When the diagnosis system is switched from the normal mode to the check mode, it erases all Diagnostic Trouble Codes (DTC) and freeze frame data recorded. Before switching modes, always check the DTC and freeze frame data and write them down.

Turn the ignition switch to the ON position and switch the OBD II scan tool switch to ON .

Use the OBD II scan tool to check the DTC and freeze frame data. Write them down.

Compare the codes found to the applicable diagnostic code chart. If necessary, refer to the individual component tests in this section. If the component tests are OK, test the wire harness and connectors for shorts, opens and poor connections.

Procedure for Clearing Trouble Codes:

After repair of the system, the diagnostic code(s) must be removed from the ECM memory. With the ignition turned OFF , remove the 15 amp EFI fuse for 30 seconds or more. Once the time period has been observed, reinstall the fuse and check for normal code output.

If the diagnostic code is not erased, it will be retained by the ECM and appear along with a new code in event of future trouble.

Cancellation of the trouble code can also be accomplished by disconnecting the negative battery cable. However, disconnecting the battery cable will erase the other memory systems including the clock and radio settings. If this method is used, always reset these components once the trouble code has been erased.