240sx HICAS diagnostic procedure

[AZhitman]

HICAS Diagnostic Procedure

1. Input starting conditions for self-diagnosis.* Turn ignition switch "OFF".* Set shift lever to "P" or "N" (A/T) or "Neutral" (M/T).* Turn ignition switch "ON".* Immediately start engine.* Turn steering wheel from left to right (at least 20deg from the neutral position) 5- times or more, then depress foot brake pedal at least 5- times all within 10- seconds after ignition switch has been turned "ON".

2. Input self-diagnosis item.* Depress and release foot brake pedal.* Turn steering wheel from left to right (at least 20deg) from the neutral position.

* (M/T model):Depress clutch pedal and move gear shift lever to any position other than Neutral and return to Neutral. Release clutch pedal.

(A/T model):Disengage and engage parking brake lever. Move shift lever to any position other than Neutral or Parking and return to Parking.* Move car at least 3 meters (10ft) forward and proceed at indicated speed of at least 2km/h (1mph) in self-diagnosis mode.

3. The self-diagnosis mode will then appear in the "HICAS" warning lamp.* When all systems are normal HICAS warning lamp flashes at 0.25 second intervals.* When there is a system malfunction (there is a nifty diagram here of HICAS lamp pulses. I tried to translate them to words...)

Mode A)10 short pulses for 5 seconds.No pulses for 5 seconds.Nine 2-second interval indicating the system status (18 seconds total).(short pulse = good, 1 second pulse=bad)1) HICAS Solenoid R.H.2) HICAS Solenoid L.H.3) Fail-Safe Valve4) (Constantly normal mode)5) Vehicle Speed Sensor6) Steering Angle Sensor7) Steering Neutral Position Sensor8) A/T: Parking brake sensor M/T: Clutch Sensor9) A/T: Inhibitor Sensor M/T: Neutral Sensor

** Display repeats until ignition switch is turned "OFF" or 5 min has past.

Mode B)Lamp on for 5 seconds.No pulses for 5 seconds.Nine 2-second interval indicating the system status (18 seconds total).(short (0.1 sec) pulse = good, 1 second pulse=bad)1) HICAS Solenoid R.H.2) HICAS Solenoid L.H.3) Fail-Safe Valve4) (Constantly normal mode)5) Vehicle Speed Sensor6) Steering Angle Sensor7) Steering Neutral Position Sensor8) A/T: Parking brake sensor M/T: Clutch Sensor9) A/T: Inhibitor Sensor M/T: Neutral Sensor

** Display repeats until ignition switch is turned "OFF" or 5 min has past.

Note 1: To change the display mode to "A", turn OFF ignition switch after mode "B" is displayed. When battery is insufficient, mode "B" is displayed.

Note 2: If fail-safe system was operated (fail-safe valve is operating) when ignition switch was turned OFF for the last time, mode A will be displayed. If fail-safe system was not operated when the ignition switch was turned OFF for the last time, mode B will be displayed.

* Canceling the self-diagnosis function

Three methods.1) By turning the ignition switch off.2) After self-diagnosis has been operated for ~5 minutes.3) If the vehicle speed goes over 30 km/h (19 mph).