Verifying Codes With Multi-Use Tester - Purpose (TSB-92-00-001)

VERIFYING CODES WITH MULTI-USE TESTER - PURPOSE

TECHNICAL SERVICE BULLETIN

VERIFYING FAULT CODES WHEN USING THE MULTI-USE TESTER (MUT)

Models: Mitsubishi

All Vehicles Capable of Using the MUT

88-92 Galant, 1989 Starion

89-92 Mirage, 89-90 Van/Wagon

89-92 Montero, 90-92 Eclipse

90-92 Precis, 91-92 3000 GT

1992 Pickup, 1992 Diamante

89-90 Sigma, 1992 Expo

Bulletin No.: TSB-92-00-001

Date: January, 1992

Subject: Verifying Fault Codes When Using the Multi-Use Tester

(MUT)

PURPOSE

This Technical Service Bulletin describes a procedure to find out if fault codes that appear during MUT testing indicate current or previous vehicle system malfunctions.

AFFECTED VEHICLES

All which can be diagnosed using the MUT.

DESCRIPTION

Fault codes are triggered when any one of several electronic control units in the vehicle senses an abnormal condition in its operating circuitry. This abnormal condition DOES NOT always mean that a component has failed. Sometimes, just a loose wiring harness can cause a fault code to be stored.

Also, a fault code may or may not cause an indicator light to turn on, depending on the design of the vehicle system. And, some systems may continue to burn an indicator light even after the condition is corrected. For example, on vehicles equipped with an

SRS air bag system,. the SRS warning lamp will not go out unless ALL fault codes in memory are erased. To erase fault codes, the MUT must be used. They cannot be erased by disconnecting the battery.

Remember, if you see a fault code displayed on the MUT, it does not always mean that the vehicle component in question needs replacement. DO NOT replace components until the cause of the fault code is determined.

To help you verify the presence of a vehicle system malfunction when a fault code is displayed on the MUT, follow the procedure shown in

Fig 1 of this bulletin.

For further information on MUT usage, refer to the Multi-Use Tester Instruction Manual. A copy of this manual was supplied with each MUT.