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ASCD does not set when pressed.

Tiny
BREDIE
  • MEMBER
  • 1992 NISSAN MAXIMA
  • 295,000 MILES
1992 Nissan Maxima 300se Aut. Ascd does not work. When SET button is pressed green light comes on but will not hold and light goes of immediately. I have checked all relays and swapped them out. I have also swapped out the control box. I have performed all the checks as shown in the manual and everything is OK. I am at wits end and need some advice Thanks.
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Tuesday, September 25th, 2012 AT 9:41 AM

20 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
ASCD? You mean the cruise control?
Have you checked the brake switch?
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Tuesday, September 25th, 2012 AT 9:47 AM
Tiny
BREDIE
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Yes I have checked all switches and all relays and control box.
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Tuesday, September 25th, 2012 AT 9:54 AM
Tiny
KHLOW2008
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Did you actually test the brake switch and its circuits? How about the brake switch adjustment?
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Tuesday, September 25th, 2012 AT 10:07 AM
Tiny
KHLOW2008
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Have you checked for trouble codes with the gear shift indicators and are they showing correctly in dash?
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Tuesday, September 25th, 2012 AT 10:09 AM
Tiny
BREDIE
  • MEMBER
  • 12 POSTS
I have tested the cancel switch on the brake pedal for operational functionality with circuit tester.

I do not know about 'Trouble codes with the gear shift indicators' You will have to tel me more about this.
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Tuesday, September 25th, 2012 AT 10:27 AM
Tiny
KHLOW2008
  • MECHANIC
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If the transmission D indicator light does not function correctly, the cruise would not work as well.
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Tuesday, September 25th, 2012 AT 11:16 AM
Tiny
BREDIE
  • MEMBER
  • 12 POSTS
I have checked. The only D light I have is on the selector indicator next to the shift lever and is working fine.
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Tuesday, September 25th, 2012 AT 11:52 AM
Tiny
KHLOW2008
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These are the diagnostic procedures and I believe you have to go through them once again to see where you missed out.

1. Turn ignition on. Turn cruise control main switch to ON position. If indicator light comes on, go to step 2). If indicator light does not come on, check indicator bulb and main switch. If these components are okay, perform CRUISE CONTROL RELAY test under TESTING.

2. Perform POWER SUPPLY CIRCUIT test under TESTING. If power supply
circuit is okay, perform CUT-OFF CIRCUIT test under TESTING.

3. If cut-off circuit is NOT okay, check brake cancel switch, clutch switch (M/T), inhibitor relay (A/T) and inhibitor switch (A/T). If cut-off circuit is okay, perform SET/COAST SWITCH CIRCUIT test under TESTING.

4. If SET/COAST switch circuit is okay, perform SPEED SENSOR CIRCUIT
test under TESTING. If speed sensor circuit is okay, perform ACTUATOR test under TESTING. If actuator is okay, replace cruise control module.
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Tuesday, September 25th, 2012 AT 12:15 PM
Tiny
BREDIE
  • MEMBER
  • 12 POSTS
Can you please tell me where I find 'Testing' procedures as advised in latest answer by KHLow2008. Thanks.
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Wednesday, September 26th, 2012 AT 6:19 AM
Tiny
KHLOW2008
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Which are the ones you need? There are many and it covers 6 pages.
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Wednesday, September 26th, 2012 AT 7:34 AM
Tiny
BREDIE
  • MEMBER
  • 12 POSTS
I would say at least the ones mentioned in your previous list of recommendations plus any others that may be of help with this problem. Thanks again.
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Wednesday, September 26th, 2012 AT 7:48 AM
Tiny
KHLOW2008
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Let me have an email so I an send them to you.
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Wednesday, September 26th, 2012 AT 8:35 AM
Tiny
BREDIE
  • MEMBER
  • 12 POSTS
My e-mail: bredie2@telkomsa. Net

Thanks.
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Wednesday, September 26th, 2012 AT 10:44 AM
Tiny
KHLOW2008
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File has been sent to you. Hope it is helpful.
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Wednesday, September 26th, 2012 AT 1:38 PM
Tiny
BREDIE
  • MEMBER
  • 12 POSTS
Thanks I will study it and try to effect checks. I do however notice that it states 'Maxima GXE' as well as '300ZX' My model is '300 SE' and I dont know if it is the same. Also numerous references to "Fig." Is there somewhere that I can view these plates/drawings?
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Wednesday, September 26th, 2012 AT 2:23 PM
Tiny
KHLOW2008
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Should be similar no matter what the model says.

I have sent a new file with the diagrams.
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Wednesday, September 26th, 2012 AT 2:34 PM
Tiny
BREDIE
  • MEMBER
  • 12 POSTS
Thanks for information. However I have again gone through the whole system and chacked every fuse, relay, switch, actuator, Sensor, pump etc and can not find the fault. What is evident is that when I switch the car on and switch the ASCD main switch on and off one can clearly hear the relay under the hood swtched on (Activated) and off (deactivated. It seems the problem lies beyond this point in the system.

There is one item that I can not identify from the repair manual and no one can tell me what it is and what it does. It looks like a small relay but has only two connectors. There is no continuity when tested with a meter. It is connected to the sysyem with a Pink and a Red wire. Could it be faulty? See my attached photos
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Monday, October 8th, 2012 AT 2:15 PM
Tiny
KHLOW2008
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The schematic does not show any connectors for a Pink and Red wire. The component you have shown seems like a Diode. Did you test for continuity by reversing the polarity of the ohm meter?

If you have gone through the repair procedures, you should have come to a conclusion, I don't understand why you can't find the fault. A certain result should be be wrong or it tells you to replace the control module.
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Monday, October 8th, 2012 AT 5:17 PM
Tiny
BREDIE
  • MEMBER
  • 12 POSTS
I have given up in disgust with the cruise control. You were right in your assesment that the 'unidentified' unit was a diode. It works in the door entry light system However I have another request please. Have you got a schematic drawing that shows the assemly breakdown of the air (throttle) control valve return spring assembly. Thanks (See image)
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Wednesday, October 24th, 2012 AT 1:48 PM
Tiny
BREDIE
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Thanks I have sorted out the assembly and car is running fine. Regards
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Wednesday, October 24th, 2012 AT 2:59 PM

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