Accord EX Sedan L4-2254cc 2.3L SOHC (VTEC) MFI (1998)
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Multiplex Control Unit: Component Tests and General Diagnostics
Multiplex Control System Troubleshooting
Special Tool Required:
MPCS Service Connector 07WAZ-001010A
1. Check the No.9 and 13 passenger fuses.
Are the fuses OK?
YES-Go to step 2.
NO-Find and repair the cause of the blown fuse.
2. Test power and ground inputs to all three multiplex control units.
3. Check self-diagnosis function Mode 1 for a diagnostic trouble code (DTC) by connecting the special tool to the multiplex control inspection
connector (A). After about 5 seconds, the ignition key light should come on and the beeper should beep for 2 seconds, then go off for 0.2 seconds,
then blink and beep for 0.2 seconds. This means that you are in Mode 1 of the self-diagnosis function.
4. Turn the ignition switch ON (II).
Does the ignition key light blink and the beeper beep?
YES-There is a DTC. Count the blinks/beeps, then go to step 7.
NO-See if the SCS circuit is working properly. Go to step 5.
5. Check for continuity between the No.3 terminal of the inspection connector and the A15 terminal in the driver's unit.
Is there continuity?
YES-Go to step 6.
NO-Repair the open in the wire, and recheck for DTCs.
6. Check for continuity between the No.1 terminal of the inspection connector and body ground.
Is there continuity?
YES-Go to step 13.
NO-Repair the open in the wire, and recheck for DTCs.
