Mitsubishi Galant/Mirage/Diamante 1990-2000

Reading Codes

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WITH A SCAN TOOL





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Fig. Plug the scan tool into the DLC under the driver's side of the instrument panel



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Fig. Follow the directions on the scan tool screen to retrieve the DTC's



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Fig. In this case, we would choose 1-Trouble Codes to retrieve the DTC's



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Fig. The PCM in this vehicle contains no DTC's

The Diagnostic Link Connector (DLC), under the left-hand side of the instrument panel, must be located to retrieve any DTC's.

Reading the control module memory is on of the first steps in OBD II system diagnostics. This step should be initially performed to determine the general nature of the fault. Subsequent readings will determine if the fault has been cleared.

Reading codes can be performed by any of the methods below:



Read the control module memory with the Generic Scan Tool (GST)
 
Read the control module memory with the vehicle manufacturer's specific tester
 

To read the fault codes, connect the scan tool or tester according to the manufacturer's instructions. Follow the manufacturer's specified procedure for reading the codes.

WITHOUT A SCAN TOOL



The Diagnostic Link Connector (DLC), under the left-hand side of the instrument panel, must be located to retrieve any DTC's.

In 1996, all Mitsubishi switched from an arbitrary code listing and format, to the federally regulated On Board Diagnostics 2nd Generation (OBD II) code system. Normally, OBD II equipped vehicles do not have the option of allowing the person servicing the vehicle to flash the codes out with a voltmeter; usually a scan tool is necessary to retrieve OBD II codes. Mitsubishi, however, does provide this option.

The Federal government decided that it was time to create a standard for vehicle diagnostic systems codes for ease of servicing and to insure that certain of the vehicle's systems were being monitored for emissions purposes. Since OBD II codes are standardized (they all contain one letter and four numbers), they are easy to decipher.



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Fig. For OBD II code retrieval without using a scan tool on Mitsubishi models, connect the DVOM and jumper wire as shown

The OBD II system in the Mitsubishi models is designed so that it will flash the DTC's out on a voltmeter (even though a scan tool is better). However, the first two characters of the code are not used. This is because the transaxle is a part of the powertrain, so all transaxle related codes will begin with a P. Also, since there are no overlapping numbers between SAE and Mitsubishi codes, the second digit is also not necessary.

The system flashes the codes out in a series of flashes in three groups, each group corresponding to one of the three last digits of the OBD II code. Therefore, Code P0753 would be flashed out in seven flashes, followed by five flashes, then by three flashes. Each group of flashes is separated by a brief pause. All of the flashes are of the same duration, with the only exception being zero. Zero is represented by a long flash. Therefore, seven flashes, one long flash, two flashes would indicate a P0702 code (shorted TP sensor circuit).

To retrieve the codes, perform the following:

  1. Perform the preliminary inspection, located earlier in this section. This is very important, since a loose or disconnected wire, or corroded connector terminals can cause a whole slew of unrelated DTC's to be stored by the computer; you will waste a lot of time performing a diagnostic "goose chase."
  2.  
  3. Grab some paper and a pencil or pen to write down the DTC's when they are flashed out.
  4.  
  5. Locate the Diagnostic Link Connector (DLC), which is usually under the left-hand side of the instrument panel.
  6.  
  7. Start the engine and drive the vehicle until the transaxle goes into the failsafe mode.
  8.  
  9. Park the vehicle, but do not turn the ignition OFF . Allow it to idle.
  10.  
  11. Attach a voltmeter (analog or digital) to the test terminals on the Diagnostic Link Connector (DLC). The negative lead should be attached to terminal 4 and the positive lead to terminal 1.
  12.  
  13. Observe the voltmeter and count the flashes (or arm sweeps if using an analog voltmeter); note the applicable codes.
  14.  
  15. After all of the DTC(s) have been retrieved, fix the applicable problems, clear the codes, drive the vehicle, and perform the retrieval procedure again to ensure that all of the codes are gone.
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