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Old 01-09-2005, 09:22 PM
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BltFordTough BltFordTough is offline
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'97 Ranger cruise control not working.

Hey Guys,

The cruise control on my ranger does not work. I did a search here and found a bunch of threads. In one of the posts some one said to do a test. I think it said push one button and turn the key to on and you can test the system. Each button you push should turn the cruise light on once. I did that and the on and off button turn on the light but the other 3 dont. Could some one give me a clue where to start troubleshooting?

Thanks!
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Old 01-10-2005, 07:52 PM
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You have to press the buttons as soon as the light goes out from the last one or it will exit the test.
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Old 01-11-2005, 07:01 PM
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Ken, Thanks for the help. I was able to finish the test. It came up with 3 flashes

3- Brake Deactivation Circuitry Brake pressure control valve defective circuitry

???
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Old 01-11-2005, 08:24 PM
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The deactivation switch is on the front end of the master cylinder, will need bleeding if replaced.

Pinpoint Tests

PINPOINT TEST A: SPEED CONTROL INOPERATIVE

A1 VERIFY THERE IS POWER TO SPEED CONTROL SERVO
Disconnect harness connector from the speed control servo.
Use Rotunda 73 Digital Multimeter 105-R00051 or equivalent to make the specified measurements at the harness connector. To avoid terminal damage, use Rotunda Terminal Adapter Kit 105-00025 or equivalent.
With the ignition switch in RUN, measure voltage between Pin 7 (Circuit 1003 [GY/Y], Ranger, Circuit 296 [W/P], Aerostar) ground.
Is battery voltage measured (12v nom.)?




Yes No
GO to A2 . SERVICE Circuit 1003 (GY/Y) (Ranger) or Circuit 296 (W/P) (Aerostar) as necessary. REPLACE fuse if necessary.

A2 CHECK FOR STUCK STOPLIGHT SWITCH
With no brakes applied, measure the voltage between Pin 4 (Circuit 306 [ T/LB], Ranger, Circuit 810 [R/LG], Aerostar) and Pin 10 (Circuit 676 [PK/O]).
Is battery voltage measured (12v nom.)?
Yes No
Stoplight switch is stuck on. REPLACE stoplight switch. Stoplight switch is OK. GO to A3 .

A3 CHECK BRAKE/CLUTCH CIRCUIT
With the ignition switch in OFF position, measure the resistance between Pin 4 (Circuit 306 [T/LB], Ranger, Circuit 810 [ R/LG], Aerostar) and Pin 10 (Circuit 676 [ PK/O]).
Is resistance less than 20 ohms?
Yes No
Brake input Circuit OK. GO to A4 . Brake light bulbs blown or brake circuit open. SERVICE circuit.

A4 CHECK DEACTIVATOR SWITCH CIRCUIT
Turn the ignition switch to RUN position.
With no brakes applied, place a 12-volt circuit test light between Pin 9 (Circuit 307 [BK/Y], Ranger, Circuit 636 [ O], Aerostar) and Pin 10, (GND, Circuit 676 PK/O).
Is the light illuminated?
Yes No
GO to A7 . GO to A5 .

A5 VERIFY POWER AT DEACTIVATOR SWITCH HARNESS CONNECTOR
Remove wiring harness connector from deactivator switch.
Place 12-volt circuit test light between Circuit 1003 ([ GY/Y], Ranger, Circuit 10 [LG/R], Aerostar) of deactivator switch connector and chassis ground.
Is the light illuminated?
Yes No
GO to A6 . SERVICE blown fuse 11 or open Circuit 1003 (GY/Y) for Ranger or Circuit 10 (LG/R) for Aerostar.

A6 CHECK FOR OPEN CIRCUIT BETWEEN DEACTIVATOR SWITCH AND SPEED CONTROL SERVO
Measure resistance of Circuit 307 (BK/Y), Ranger, circuit 636 (O), Aerostar from deactivator switch connector to Pin 9 of speed control servo connector.
Is resistance less than 1 ohm?
Yes No
REPLACE deactivator switch. SERVICE open Circuit 307 (BK/Y), Ranger or Circuit 636 (O), Aerostar in harness.

A7 CHECK FOR STUCK "ON" SPEED CONTROL ACTUATOR SWITCH ASSEMBLY
With no steering wheel switches pressed, measure voltage between Pin 5 (Circuit 151 [LB/BK]) and Pin 10 (GND, Circuit 676 [ PK/O]).
Is there battery voltage?
Yes No
REPLACE left (ON/OFF) speed control actuator switch. GO to A8 .

A8 CHECK "ON" SWITCH OPERATION
With steering wheel ON switch pressed, measure voltage between Pin 5 (COMMAND, Circuit 151 [LB/BK]) and Pin 10 (GND, Circuit 676 [ PK/O]).
Is there battery voltage (12v nom.)?
Yes No
GO to A12 . GO to A9 .

A9 VERIFY POWER AT AIR BAG SLIDING CONTACT CONNECTOR AT BASE OF STEERING COLUMN
Disconnect air bag sliding contact at 6-pin connector at the base of steering column.
Measure voltage between Circuit 6 (Y/LG) at air bag sliding contact connector on instrument panel harness and Pin 10 (Circuit 676 [ PK/O]) of speed control servo connector.
Is there battery voltage?
Yes No
GO to A10 . CHECK fuse 12 (Aerostar) or fuse D (Ranger), Circuit 460 (Y/LB), horn relay, and Circuit 6 (Y/LG). SERVICE as necessary.

A10 CHECK AIR BAG SLIDING CONTACT FOR HIGH RESISTANCE
Disconnect speed control actuator switch connector from air bag sliding contact.
Measure resistance across each of the air bag sliding contact windings between the air bag sliding contact connector at the base of steering column and speed control switches connector in steering wheel.
Is each resistance reading less than 1.0 ohm?
Yes No
GO to A11 . REPLACE air bag sliding contact.

A11 CHECK FOR OPEN CIRCUIT IN STEERING WHEEL WIRING HARNESS
Reconnect air bag sliding contact assembly at base of steering column.
Disconnect connector at ON/OFF switch.
Measure voltage between Pin 5 (Circuit 151 [LB/BK]) and chassis ground (steering wheel).
Is there battery voltage?
Yes No
REPLACE left (ON/OFF) speed control actuator switch. REPLACE steering wheel wiring harness.

A12 CHECK FOR STUCK COMMAND SWITCHES
With no steering wheel switches pressed, measure resistance between Pin 5 (Circuit 151 [LB/BK]) and Pin 6 (COMMAND RTN, Circuit 848 [ DG/O], Ranger, Circuit 248 [T/O], Aerostar).
Is resistance greater than 3k Ohms?
Yes No
GO to A13 . If resistance is less than 100 ohms, REPLACE left (ON/OFF) switch. If greater than 100 ohms, REPLACE right (RSM/SET/COAST) switch.

A13 CHECK SET/ACCEL SWITCH OPERATION
With the SET/ACCEL switch pressed, measure the resistance between Pin 5 (COMMAND, Circuit 151 [LB/PK]) and Pin 6 (COMMAND RTN, Circuit 848 [DG/O], Ranger, Circuit 248 [ T/O], Aerostar).
Is resistance between 646 and 714 ohms?
Yes No
GO to A14 . REPLACE right (RSM/SET/COAST) speed control actuator switch.

A14 CHECK COAST SWITCH OPERATION
With COAST switch pressed, measure resistance between Pin 5 (Circuit 151 [ LB/BK]) and Pin 6 (Circuit 848 [DG/O], Ranger, Circuit 248, [T/O] Aerostar).
Is resistance between 114 and 126 ohms?
Yes No
GO to A15 . REPLACE right (RSM/SET/COAST) speed control actuator switch.

A15 CHECK RESUME SWITCH OPERATION
Disconnect harness connector from speed control servo assembly.
With RSM switch pressed, measure resistance between Pin 5 (Circuit 151) and Pin 6 (Circuit 848 [DG/O], Ranger, Circuit 248, [ T/O] Aerostar).
Is resistance between 2090 and 2310 ohms?
Yes No
GO to A16 . REPLACE right (RSM/SET/COAST) speed control actuator switch.

A16 CHECK OFF SWITCH OPERATION
Disconnect harness connector from speed control servo. With OFF switch pressed, measure resistance between Pin 5 (Circuit 151) and Pin 6 (Circuit 848 [ DG/O], Ranger, Circuit 248, [T/O] Aerostar).
Is resistance less than 4 ohms?
Yes No
GO to A17 . REPLACE left (ON/OFF) speed control actuator switch.

A17 CHECK COMMAND SWITCH RETURN CIRCUIT
Measure resistance between Pin 6 (Circuit 848 [ DG/O], Ranger, Circuit 248 [T/O], Aerostar) and Pin 10 (GND, Circuit 676 [PK/O]).
Is resistance greater than 1 ohm?
Yes No
If Ranger, GO to A18 . If Aerostar, GO to A22 . SERVICE short in Circuit 848 or Circuit 248. RECONNECT speed control servo.

A18 CHECK VSS CIRCUIT (RANGER)
Measure resistance between Pin 3 (Circuit 679 [ GY/BK]) and Pin 10 (Circuit 676 [PK/O]).
Is resistance between 200 and 300 ohms?
Yes No
GO to A20 . GO to A19 .

A19 CHECK VSS (RANGER)
Remove VSS connector.
Measure resistance across VSS terminals.
Is resistance between 200 and 300 ohms?
Yes No
CHECK for opens or shorts in Circuit 679 (GY/BK) and 676 (PK/O). REPLACE vehicle speed sensor.

A20 ROAD TEST VEHICLE
Road test vehicle and observe speedometer needle.
Does the needle waver?
Yes No
REPLACE vehicle speed sensor. Vehicle speed sensor checks OK. GO to A21 .

A21 CHECK FOR BROKEN OR BINDING CABLE
Remove speed control actuator cable from speed control servo assembly.
Check for broken or binding cable by pulling on cable ball slug to ensure throttle moves freely.
Is cable OK?
Yes No
REPLACE speed control servo assembly. REPLACE speed control actuator cable.

A22 CHECK PSOM CIRCUIT (AEROSTAR)
Disconnect the harness connector from PSOM.
Measure resistance between speed control servo connector Pin 3 (Circuit 679 [GY/BK]) and PSOM connector Pin 7 (Circuit 679 [ GY/BK]).
Is resistance less than 5 ohms?
Yes No
GO to A23 . SERVICE open in Circuit 679 (GY/BK).

A23 CHECK PSOM CIRCUIT FOR SHORT (AEROSTAR)
Measure resistance between PSOM connector Pin 7 (Circuit 679 [ GY/BK]) and ground.
Is resistance greater than 10,000 ohms?
Yes No
REFER to Section 13-01 for diagnosis of PSOM. If PSOM is OK, GO to A24 . SERVICE short to ground in Circuit 679 (GY/BK).

A24 CHECK FOR BROKEN OR BINDING CABLE
Remove speed control actuator cable from speed control servo assembly.
Check for broken or binding cable by pulling on cable ball slug to ensure throttle moves freely.
Is cable OK?
Yes No
REPLACE speed control servo assembly. REPLACE speed control actuator cable.
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X Ranger, BII & NJ Chapter Moderator
2000 XLT Sport SC 3.0
2002 XLT Std Cab Long Bed 3.0
1989 Custom Std Cab Short Bed 2.9
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Old 01-11-2005, 09:09 PM
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BltFordTough BltFordTough is offline
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I looked at that sensor and it seems to be leaking brake fluid out of the top! When I replace the sensor the system would need to be bled like normal at all 4 corners ?
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Old 01-12-2005, 07:25 PM
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Thats what I would do.
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Old 09-30-2008, 09:41 PM
blandess blandess is offline
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no go on the cruise control

Ken, that pin point test was perfect for my '95. My speed control servo passed everything on the test. I put everything back together and did a road test. It worked after that. The only thing I can think of was the cable at the servo was in a bind. When I took it off at the servo to check the cable, it must have went back together correctly. Thanks.
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Old 09-30-2008, 09:41 PM
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