Lancer L4-2.4L SOHC (2005)
Column Switch Power Supply And SWS Communication Circuit Part 2
CIRCUIT OPERATION
-
The power supply to the column switch is provided by the battery and the ignition switch (IG1).
-
If the power supply system from the battery is defective, the system operates by the power sup- ply from the ignition switch (IG1).
TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit to the column switch (column-ECU) may be defective. If the battery power supply circuit (terminal 1 of the column switch) to
the ECU is damaged, also check the power supply circuit from the ignition switch (IG1) (terminal 9 of the column switch), and repair if necessary.
TROUBLESHOOTING HINTS
-
The ETACS-ECU may be defective
-
The column switch may be defective
-
The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
Required Special Tools:
-
MB991223: Harness Set
-
MB991958: Scan Tool (MUT-III Sub Assembly)
-
MB991824: Vehicle Communication Interface (V.C.I.)
-
MB991827: MUT-III USB Cable
-
MB991911: MUT-III Main Harness B
-
MB991813: SWS Monitor Kit
-
MB991806: SWS Monitor Cartridge
-
MB991812: SWS Monitor Harness (For Column-ECU)
-
MB991922: Probe Harness
STEP 1. Use scan tool MB991958 to select "ECU COMM CHK" on the SWS monitor display.