North American Turbocoupe Organization



vac brake conversion and now cruise isnt working
longbedGTs Offline
Senior Member
#1
As the title says... Does the cruise have any grounds that were connected or run through one of the plugs for the factory braking system? Or...it may be possible that I bumped one of the connectors under the dash while getting to the 4 nuts that hold the braking unit to the firewall. Is there any sort of diagnostics that I can run or is there a wiring schematic anywhere? Thanks!
88 TC 5spd~money pit
88 TC 5spd~78K miles
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Pete D Offline
Administrator
#2
Check your email.
Pete Dunham


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jmthunderbirdturbo Offline
Posting Freak
#3
there is a switch on the ABS module that shuts off cruise. you may have to jumper the connector for that switch.
APRIL 2018 - LOOKING FOR A NEW CAR. PM me if you have an 87-88 roller or cheap TF for sale.
1988 TC 5MT-Blue/Blue check-off car. resto-project.
2006 Honda Odyssey 5AT, baby-mobile.
2013 F-150, 5.0, 6AT, 4x4, snow white paint.
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longbedGTs Offline
Senior Member
#4
Thanks Pete, I got the diagrams. Jon...where would I find this switch? Or is it just a 2 wire plug that needs to be jumped?
88 TC 5spd~money pit
88 TC 5spd~78K miles
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BJL Offline
Moderator
#5
what parts did you use for your conversion?
Brian Larkin
88TC 330,000 miles
Slightly Modified
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Gman Offline
Member
#6
Same issue - hydroboost conversion. Any details on that jumper for the ABS module?
1987 TC project car
Red butt splice - boosting about a bar
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Gman Offline
Member
#7
Well, after extensive research on this board and www, I found these pages on cruise control: Ford Cruise Control
According to thorssell, the inputs to the amplifier are on the six pin connector: ignition power (pin 3), two wire VSS (pins 4&6*), stop light switch (pin 1), and steering wheel switches (pin 2).

[*I verified this wiring visually on my '87 TC. YMMV]

After checking the ground to frame ground resistance less than 5 ohms, I checked ignition power when KOEO. I then depressed the brake and found that the stop light switch pin yields 12V.

Thus, unless there is an switch on ABS that interrupts the steering wheel switches, there is no such thing, since this is the only input that I did not check.

Next, I checked for servo power (8 pin connector, pin 4) and found less than a volt. I failed to hit the ON button and check it again, but that and steering switch signals are next on my list.
1987 TC project car
Red butt splice - boosting about a bar
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TurboCoupe50 Offline
Posting Freak
#8
Is the vacuum dump valve on brake pedal sealing properly?? No vac leak??
1988 Turbo Coupe331 AOD

1972 Comet GT

1969 Fairlane Cobra 428CJ 4-Speed
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Jeff K Offline
Administrator
#9
^^^^^^ +1

There is no cruise deactivation switch associated with the Teves II ABS system.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Gman Offline
Member
#10
Jeff K Wrote:There is no cruise deactivation switch associated with the Teves II ABS system.
Thank you for confirming that Jeff.
1987 TC project car
Red butt splice - boosting about a bar
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