This is how I check and erase codes on a '98 Ficht
hope this helps
To manually check the codes hold open the throttle position sensor
in the WOT position.
(I have used a rubber band if a friend isn't available)
Turn the key but don't turn over the motor, the warning beep will sound and then the dash light (engine code light) will begin to flash, count the flashes
or "groups" of flashes, kinda like morse code.
code 12- TPS malfunction
13- TPS below expected range
14 - TPS above expected range
15 - ROM failure
16 - Crankshaft Position Sensor out of adjustment or damage
17 - Alternator Voltage low
18 - Alternator Voltage high
23 - ECU Temp malfunction
24 - ECU Temp Low
25 - ECU Temp High
26 - Battery Voltage Low
27 - Battery Volyage High
28 - Shift Assist Circuit Malfunction
37 - Water in Fuel Sensor Activation
41 - Water Temp Circuit malfunction
42 - Water Temp below expected range
44 - Barometric pressure Sensor circuit malfunction
45 - BP sensor below expected range
46 - BP sensor above range
47 - Air Temp Circuit malfunction
48- Air temp below expected range
49 - Air Temp above range
To manually clear the service codes and erase "soft codes".
While in diagnostic mode, return the throttle position sensor to its idle position, wait 5 seconds and the check engine light will come on.
Move the TPS to its WOT limit, check engine light will go out.
Then back to low end limit, light will come back on.
Make sure TPS travels to both limits, repeat the low to high steps for 5 cycles, after cycle 5 on the low end limit, the check light will stay on until the TPS is remounted. After remount, if there are no hard codes, the light will stay off.
Turn off the key off and all soft codes will be erased.
Probably not a bad idea to disconnect the motor from the negative battery terminal at this time, wait 10 minutes and reconnect.
Engine must be run to re-aquire any soft codes.
