Galant AWD L4-1997cc 2.0L DOHC Turbo (1991)
Engine Control Module: Component Tests and General Diagnostics
When checking or correcting engine component malfunctions, check basic engine components prior to troubleshooting the Electronic Control Unit . See:
Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Strategies
Electronic Control Unit (ECU) Location
To test the Electronic Control Unit (ECU), located on the right side of the passenger compartment below the dash, proceed as follows:
1.
Using the testing procedures See: Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes
extract all malfunction codes.
Diagnosis memory is erased if the battery or the ECU connector is disconnected. Do not disconnect the battery before the trouble codes are
completely read. If a sensor connector is disconnected with the ignition switch turned on, the diagnosis code is memorized. Be sure to check the
battery for Voltage and other conditions before starting the test.
On-Board Diagnostics Check Connector Location
2.
Does the ECU output a steady 12 VDC at the diagnostic check connector?
a. If not, and the ECU is suspected to be faulty, Test to confirm that the ECU is being supplied with power and ground.
b. If so replacement of the ECU is required.
ECU Probing Technique
To test pins using a multi-meter do not remove the connector from the ECU, instead insert a straight pin or needle from the back side of the
connector to access each pin.