Lancer L4-2.0L SOHC (2004)
1. Connect scan tool MB991958 to the data link connector.
2. Operate scan tool MB991958 according to the procedure below to display "PULSE CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
3. When each front door is opened and closed, check if scan tool MB991958 sounds or not.
Q: Does scan tool MB991958 sound when each front door is opened and closed?
When the driver's door is opened and closed, scan tool MB991958 does not sound. : Go to Step 2.
When the front passenger's door is opened and closed, scan tool MB991958 does not sound. : Go to Step 7.
when each front door is opened and closed, scan tool MB991958 sounds. : Replace the ETACS-ECU. If the functions, which are described in
"CIRCUIT OPERATION", work normally, the input signal from the driver's or the front passenger's door switch should be normal.
STEP 2. Measure at the lower metal part of the driver's door switch in order to check the ground circuit to the driver's door switch.
NOTE: Check that the driver's door switch is grounded to the vehicle body by means of its mounting screw.
Remove the cap, and measure the resistance value between the lower metal part and the ground.
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The resistance should equal 2 Ohms or less.
Q: Is the measured resistance 2 Ohms or less?
YES: Go to Step 3.
NO: Check the fit of the switch, and repair if necessary. If the functions, which are described in "CIRCUIT OPERATION", work normally, the input
signal from the driver's door switch should be normal.