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 LOCATIONS 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 codes
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. 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.

ECM LOCATIONS

Application	Location
Sentra	Under Dash, Behind Center Console

Fig 1: Turning Test Mode Selector

Courtesy of FORD MOTOR CO.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Retrieving Codes