Reading Diagnostic Trouble Codes
CHECK USING ON-BOARD DIAGNOSTICNOTE: When using the scan tool [Multi-use tester (MUT)
1. With the ignition switch OFF, connect the scan tool.
When connecting the scan tool (MUT-II) to a 1993 model vehicle, use the adapter harness supplied together.
CAUTION: Turn off the ignition switch beforehand whenever the scan tool is connected or disconnected.
Turn the ignition ON and select the ABS system. (The ABS warning light lights up, it goes into the scan tool mode. In the scan tool mode, ABS does not function.) If it does not go into the scan tool mode, check the ECU power circuit and the harness between the ECU and diagnostic output terminals.
2. Read the on-board diagnostic output codes from the ECU memory.
3. Clear the diagnostic trouble codes once from memory.
If the memory cannot be cleared, the ECU is currently detecting the trouble and the ABS ECU is in fail safe. If it can be cleared, the trouble is either temporary or appears only when driving.
4. When the diagnostic trouble codes cannot be cleared, or when the ABS ECU goes into fail safe during another test drive and diagnostic trouble codes are output, check according to diagnostic trouble code check charts (E-1 -E-6).