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Cruise Control Surging Badly 

 

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 Post subject: Cruise Control Surging Badly
Posted: Fri Sep 19, 2014 6:50 pm 
Getting Side Ways
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I'm not sure which area to put this thread

My AU3 XR8 drives really nicely, no problems, no ecu/trans codes. But when I put the cruise control on, it surges badly, even on flat road. It's like the cruise control is making throttle adjustments that are way too much to correct the slight overspeed or underspeed. So the car is either noticably accelerating, or noticably decelerating, rather than just cruising. I can cruise on the same stretch of road using my right foot to control speed, and everything is fine. So it is the cruise control unit or an input that is dodgy.

Can anyone shed any light on the cause or any tests that might help pinpoint the cause?

 

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XA Faimont 351C, AU2 XR8 Manual 5.0, DA LTD 5.0, Mk1 Capri 5.0, 1995 Mustang 5.0, EF2 XR8 Manual, EF2 Fairmont Ghia 5.0, AU3 XR8 Auto, AU2 XR8 Auto, AU2 XR8 Manual Ute, TE Cortina 5.0 Manual, DU LTD 5.0 soon to be manual

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 Post subject: Re: Cruise Control Surging Badly
Posted: Wed Sep 24, 2014 11:02 pm 
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Location: Campbelltown
NSW, Australia

try testing cruise cancel and stop lights - check all stop lights work-
cancel switch on master cylinder -bridge connections with a piece of wire and test BUT be ready to turn Off with main switch as the cruise won't cancel with this circuit bridged-
does speedo work correctly?
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 Post subject: Re: Cruise Control Surging Badly
Posted: Thu Sep 25, 2014 12:36 am 
Technical Contributor
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Ride: 96 XH/97 EL

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If it's a manual, it should have a clutch switch, which is normally closed with foot off the pedal.
If the switch was faulty, cruise would switch on, but not engage.

Don't forget to check your cable connections, and the plastic retainer that goes over the cable drum on the CC unit is clicked in properly.

 

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96 XH Longreach 'S': LPG, Alarm, 3.23:1 LSD, Cruise, Trip Comp, ABS, Power Windows, Mid Series Dome Lt, Climate Ctrl
97 EL Futura S/W: LPG, Alarm, LED int Lts, Trip Comp, F/Lane Dome Lt, Climate Ctrl, T5 Conversion

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 Post subject: Re: Cruise Control Surging Badly
Posted: Sun Sep 28, 2014 7:56 pm 
Getting Side Ways
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I replaced the controller with one from an AU2 XR8 and it now works perfectly.

Turns out the old controller was from an EF V8 (1994 p/n). Looks identical, plugs in the same, bolts in the same, has the same cable hookup. Maybe it was incompatible electrically???

 

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XA Faimont 351C, AU2 XR8 Manual 5.0, DA LTD 5.0, Mk1 Capri 5.0, 1995 Mustang 5.0, EF2 XR8 Manual, EF2 Fairmont Ghia 5.0, AU3 XR8 Auto, AU2 XR8 Auto, AU2 XR8 Manual Ute, TE Cortina 5.0 Manual, DU LTD 5.0 soon to be manual

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 Post subject: Re: Cruise Control Surging Badly
Posted: Sun Sep 28, 2014 8:46 pm 
Getting Side Ways
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They are different - The AU Series Cruise Control talks to the PCM, telling it how to hold gear strategy etc. Its a very simply signal, but the E Series doesnt use this.

Its also used to allow the Auto's to run a different Shift Map so they dont change gears all the time.

Did you notice if your Dash light worked correctly? - It shouldnt have

Nigel
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 Post subject: Re: Cruise Control Surging Badly
Posted: Mon Sep 29, 2014 11:56 am 
Getting Side Ways
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Joined: 1st Jan 2006

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Location: Hamilton
New Zealand

Dash appeared to run correctly, both in "dash mode" and "diagnostic mode". No ecu or any other fault codes either. What were you expecting would not work correctly?

 

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XA Faimont 351C, AU2 XR8 Manual 5.0, DA LTD 5.0, Mk1 Capri 5.0, 1995 Mustang 5.0, EF2 XR8 Manual, EF2 Fairmont Ghia 5.0, AU3 XR8 Auto, AU2 XR8 Auto, AU2 XR8 Manual Ute, TE Cortina 5.0 Manual, DU LTD 5.0 soon to be manual

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 Post subject: Re: Cruise Control Surging Badly
Posted: Mon Sep 29, 2014 12:04 pm 
Getting Side Ways
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AU Falcon signals the ECU for its status using a PWM signal (On, Set, Off). The ECU Uses DOL to set the cluster lights.

The E Series Cruise directly interacts with the Dash and directly sets the indicators

Nigel
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