Dodge Dakota (R1). Manual — part 875

Symptom:

*CHECKING SPEED CONTROL OPERATION WITH NO DTC’S
PRESENT

POSSIBLE CAUSES

S/C SW SIGNAL CIRCUIT TO CLOCKSPRING CONNECTOR OPEN

GROUND CIRCUIT AT S/C SERVO CONNECTOR OPEN

GROUND CIRCUIT TO S/C RESUME/ACCEL SWITCH CONNECTOR OPEN

DRBIII

t DOES NOT SHOW SET SWITCH 9PRESSED9 OR RELEASED

S/C WIRING HARNESS OBSERVABLE PROBLEM

CANCEL SWITCH

COAST SWITCH

THROTTLE CABLE OBSERVABLE PROBLEM

THROTTLE OPENS AND CLOSES

SPEED CONTROL ON/OFF SWITCH STUCK

SPEED CONTROL RESUME/ACCEL SWITCH

SPEED CONTROL RESUME/ACCEL SWITCH STUCK

TEST

ACTION

APPLICABILITY

1

Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the Speed Control Switch state.

While observing the display, press the Brake Pedal several times.
Does the DRBIII

t show Brake Switch 9pressed9 and 9released9?

All

Yes

→

Go To

2

No

→

Go To

17

2

Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the Speed Control Switch state.

While observing the display, press the On/Off Switch several times.
Does the DRBIII

t show On/Off Switch 9pressed9 and 9released9?

All

Yes

→

Go To

3

No

→

Go To

41

3

Turn the ignition off.
Using the Schematics as a guide, inspect the Wiring and Connectors.
Were any problems found?

All

Yes

→

Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

No

→

Go To

4

232

SPEED CONTROL

TEST

ACTION

APPLICABILITY

4

Turn the ignition off.
Disconnect the Speed Control Servo harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Ground Circuit at the Servo harness connector to
ground.
Is the resistance below 5.0 ohms?

All

Yes

→

Go To

5

No

→

Repair open Ground Circuit at S/C Servo Connector.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

5

Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the P/N Switch state.

While observing the display, move the Gear Selector to DRIVE.
Does the DRBIII

t show P/N switch 9D/R9?

All

Yes

→

Go To

6

No

→

Go To

6

6

Turn the ignition off.
Inspect the throttle cable and linkage for any binding or damage.
Is the cable or linkage disconnected or damaged?

All

Yes

→

Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

No

→

Go To

7

7

Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the Speed Control Set Switch state.

While observing the display, press the Set Switch several times.
Does the DRBIII

t show the Set Switch status change appropriately from Pressed to

Released?

All

Yes

→

Go To

8

No

→

Replace the Left S/C Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

8

Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the Speed Control Resume Switch state.

While observing the display, press the Resume Switch several times.
Does the DRBIII

t show the Resume Switch status change appropriately from

Pressed to Released?

All

Yes

→

Go To

9

No

→

Go To

12

9

Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the Speed Control Cancel Switch state.

While observing the display, press the Cancel Switch several times.
Does the DRBIII

t show the Cancel Switch status change appropriately from Pressed

to Released?

All

Yes

→

Go To

10

No

→

Replace the Right S/C Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

233

SPEED CONTROL

*CHECKING SPEED CONTROL OPERATION WITH NO DTC’S PRESENT
—

Continued

TEST

ACTION

APPLICABILITY

10

Turn the ignition on.
With the DRBIII

t read DTC’s.

Are any Vehicle Speed Signal codes set?

All

Yes

→

Go To

11

No

→

Go To

11

11

Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the Speed Control Coast Switch state.

While observing the display, press the Coast Switch several times.
Does the DRBIII

t show the Coast Switch status change appropriately from Pressed

to Released?

All

Yes

→

Go To

27

No

→

Replace the Right S/C Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

12

Turn the ignition off.
Disconnect the Speed Control Resume/Accel Switch harness connector.
Turn the ignition on.
With the DRBIII

t, read the Speed Control Switch Voltage.

Did the DRBIII

t show Speed Control Switch Voltage go from below 4.2 Volts to above

4.2 Volts?

All

Yes

→

Replace the Right Speed Control Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

No

→

Go To

13

13

Turn the ignition on.
With the DRBIII

t read DTC’s.

Are any Vehicle Speed Signal codes set?

All

Yes

→

Go To

14

No

→

Go To

14

14

Start the engine.
Allow engine to idle for 1 minute.
Turn the engine off, then turn the ignition on, engine not running.
With the DRBIII

t, actuate the Speed Control Servo Solenoids.

Does the Throttle open and close?

All

Yes

→

Go To

15

No

→

Perform Speed Control Vacuum Supply Test per appropriate
service procedure.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

234

SPEED CONTROL

*CHECKING SPEED CONTROL OPERATION WITH NO DTC’S PRESENT
—

Continued

TEST

ACTION

APPLICABILITY

15

At this time the Speed Control Switch and Servo functions appear to operate
properly.
Using the DRBIII

t, monitor the Speed Control OUTPUT status.

Road test the Vehicle at speeds over 35 MPH (55kmh) and attempt to set the Speed
Control.
The following items will not allow the Speed Control to set. The last or most recent
cause for Speed Control not to set is indicated by the DENIED status.
If ON/OFF Denied message is indicated, the Powertrain Control Module does not see
an ON signal from the Switch.
If SPEED Denied message is indicated, the Vehicle Speed as seen by the Powertrain
Control Module is not greater than 36 MPH.
If RPM Denied message is indicated, the Engine RPM is excessively high.
If BRAKE Denied message is indicated, the Brake Switch Sense Circuit is open
indicating to the PCM that the Brakes are applied. The Sense Circuit is grounded
through the Brake Pedal Switch when the brakes are released.
If P/N Denied message is indicated, Park/Neutral Switch Sense Circuit is grounded
indicating to PCM that Transmission is not in gear. The Sense Circuit is grounded
through the P/N Switch when Transmission is in Park or Neutral.
If RPM/SPD Denied message is indicated, the PCM senses excessive Engine RPM for
a given Vehicle speed.
If SOL FLT Denied message is indicated, the Powertrain Control Module senses a
Servo Solenoid Circuit trouble code that is maturing or set in memory.
Continue if the previous instructions have been completed.

All

Repair

Go To

16

16

Turn the ignition off.
Disconnect the Speed Control Resume/Accel Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Sensor Ground Circuit from the S/C Resume/Accel
harness connector to a good ground.
Is the resistance below 5.0 ohms?

All

Yes

→

Go To

37

No

→

Repair the open sensor ground circuit, right S/C switch connector
to the clockspring connector.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

17

Turn the ignition on.
With the DRBIII

t in Inputs/Outputs, read the Speed Control Switch state.

While observing the display, press the On/Off Switch several times.
Does the DRBIII

t show On/Off Switch 9pressed9 and 9released9?

All

Yes

→

Go To

18

No

→

Go To

41

18

Turn the ignition off.
Using the Schematics as a guide, inspect the Wiring and Connectors.
Were any problems found?

All

Yes

→

Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 4.

No

→

Go To

19

235

SPEED CONTROL

*CHECKING SPEED CONTROL OPERATION WITH NO DTC’S PRESENT
—

Continued