Retrieving Codes Using Mil
- If use of an OBD-II type scan tool is not available, DTCs can be retrieved by changing MIL output from Mode 1 to Mode 2. Mode 1 is the normal malfunction warning mode. Mode 2 displays self-diagnostic results.NOTE: Before switching MIL to Mode 2, perform bulb check (key on engine off). If MIL is inoperative, check and repair MIL circuit as necessary.
- To switch MIL output from Mode 1 to Mode 2, locate and gain access to ECM. See ECM LOCATION TABLE. Turn ignition on. Using a screwdriver, turn test mode selector fully clockwise. See Fig 1. After 2 seconds, turn test mode selector fully counterclockwise (back to original position). MIL should now be in Mode 2. When in Mode 2 with key on and engine off, MIL should begin flashing codesECM LOCATIONS
Application Location Sentra Under Dash, Behind Center Console NOTE: DTCs retrieved by MIL may also be referred to as flash codes. - The 4-digit DTCs (flash codes) are read as two 2-digit numbers. The first 2-digit number is indicated by a series of long flashes followed by a series of short flashes. E.g. 1 long flash followed by 2 short flashes indicates DTC 0102. See Fig 2. The DTCs retrieved by MIL are not numerically the same as DTCs retrieved from a scan tool.
- Write down codes and repair in order retrieved. To determine which circuit test to use, see DTC IDENTIFICATION table. After retrieving DTCs or performing a repair, clear DTCs from ECM memory.