Action When Battery Runs Out - Mitsubishi Lancer Evolution-IV Workshop Manual

27-32
REAR AXLE
Waveform Observation Points
Symptom
Waveform amplitude is too small, or no
waveform.
Waveform amplitude varies greatly. (No
problem if the smallest amplitude is 100 problem if the smallest amplitude is 100
mV or more)
Noise on waveform or disturbed
waveform waveform
Caution
Since the speed sensor cable follows the movement of the front or rear suspension, it may be
open-circuited only when the vehicle is run on rough roads and not on ordinary road. The speed
sensor output voltage waveform should therefore be checked also by rocking the sensor harness
so that driving on rough roads may be simulated.
AYC fusible link
– On-vehicle Service <Vehicles with AYC>
Probable cause
Defective speed sensor
Excessive axle hub lateral and radial runout
Poor AYC-ECU grounding
Open-circuited sensor
Open-circuited harness
Improperly mounted speed sensor
Missing or collapsed rotor tooth

8. ACTION WHEN BATTERY RUNS OUT

When the engine is started using a booster cable where the
battery has completely run down and you attempt to start
the vehicle without waiting for the battery to recover a certain
charge, the engine can misfire and you just cannot start to
move it. In such cases, charge the battery sufficiently; or,
remove the AYC fusible link from the engine compartment
relay box to make AYC inactive before attempting to start
the vehicle. When the fusible link is removed, the AYC warning
lamp lights up. After the battery has been recharged, fit the
fusible link back again and start the engine to ensure that
the AYC warning lamp is off.
Action
Replace sensor.
Replace hub.
Repair.
Replace sensor.
Repair harness.
Correct sensor installation.
Replace rotor.