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[BoostedSix]

Hi my names matt
i just bought a 1990 GTR a week ago. the hicas light is on. i was wondering how do i scan for codes?

any input on these cars, as far as how to tune, and what major problems i may encounter would be much appreciated

thanks

[gtst_skyline]

If your HICAS light is on add power steering fluid or check your level.

[DarkCaporaL]

As mentioned, check your PS fluid first as mentioned above. Check if HICAS is locked before entering diagnostic mode (the rear rack will have been replaced with a straight bar).

Here's how to get into diagnostics for HICAS (below).

Welcome to the boards.

no do not drive while your doing this unless you have an automatic.

HICAS Diagnostic Codes 1989-1993
1 HICAS solenoid right hand
2 HICAS solenoid left hand
3 Cut off valve
4 Power steering solenoid
5 Vehicle speed sensor
6 Steering angle sensor
7 Neutral position sensor
8 (Auto) Parking brake sensor, (Manual) Clutch sensor
9 (Auto) Inhibitor switch, (Manual) Neutral sensor

HICAS Diagnostic Codes 1993-1999
11 HICAS control unit
12 HICAS motor power supply not present
13 HICAS motor output not present
21 Vehicle speed sensor not present
22 Steering angle sensor not present
23 Steering angle sensor neutral or not present
24 Rear main sensor input not present
25 Rear sub sensor input not present
31 Parking brake sensor input not present
32 (Auto) Inhibitor switch input not present; (Manual) Neutral switch input not present
33 Engine speed signal not present

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 Valve
4) (Constantly normal mode)
5) Vehicle Speed Sensor
6) Steering Angle Sensor
7) Steering Neutral Position Sensor
8) A/T: Parking brake sensor
___ M/T: Clutch Sensor
9) 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 Valve
4) (Constantly normal mode)
5) Vehicle Speed Sensor
6) Steering Angle Sensor
7) Steering Neutral Position Sensor
8) A/T: Parking brake sensor
___ M/T: Clutch Sensor
9) 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).

[MKIV]

Hi Matt, welcome to the forum

[BoostedSix]

havnt been on much lately been busy at work.. the ps res was a littlke low i put some fluid in and the light turned out thanks for the help guys.
now i have another problem. i dont really kno how to explain it. i have full power with the car and then it has no balls and then the power comes back and then its gone again.... i did notice that the front end torque gauge i believe is what someone told me it is.. when i have power it goes above 10 when i dont it barely moves any ideas.. amd also my boost/vacuum gauge isnt working at all just wondering where it is hooked up ion the car

thanks
matt

[DarkCaporaL]

^ Sounds like a missfire. There are a couple threads on here about missfires. Check the "fix your hesitation" thread. I believe it's in the GTS tech stickies?

[BoostedSix]

ok ya im sure it needs a coil i just looked it over and seems thats the problem. last night when i was driving it start studdering and wont let me rev higher than 2500rpm so i figure its gone into limp mode maybe? because of the misfire?

[DarkCaporaL]

Try the basics first like cleaning your MAFs.

[BoostedSix]

ok i figured it out the guy who owned the car before me installed a cold air kit and didnt plug the maf in properly and it came undone. plugged it in and the car runs great now

thanks for the help

[GTRC Admin]

If you're free you should come out to the cruise next Sat!