Chrysler New Yorker. Manual - part 674

TEST SC-1A

CHECKING SPEED CONTROL OPERATION

Perform TEST DTC Before Proceeding

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

532

TEST SC-1A

CHECKING SPEED CONTROL OPERATION

Perform TEST DTC Before Proceeding

*Perform Verification TEST VER-4A.

**Check connectors - Clean / repair as necessary.

NOTE: USE THIS 

START TEST 

TEST ONLY WHEN 

SC-1A. THERE ARE NO 

SPEED

CONTROL CODES SET. 

USING A DRB, IS THE S/C VACUUM 

NO 

PERFORM TEST 

ACTUATE THE S/C

SOLENOID CLICKING?

TC-1B

VACUUM SOLENOID.

YES

STOP THE S/C

USING THE DRB

IS THE S/C VENT 

NO 

PERFORM TEST 

VACUUM SOLENOID 

ACTUATE THE S/C

SOLENOID CLICKING?

TC-1B

ACTUATION. VENT 

SOLENOID.

YES

KEY ON, WITH THE

WHILE OBSERVING

DOES THE DRB

DRB, MONITOR THE

DISPLAY, PRESS THE

DISPLAY SPEED

NO 

PERFORM TEST 

SPEED CONTROL

SPEED CONTROL "ON" CONTROL SWITCH 

SC-2A. 

SWITCH INPUTS.

SWITCH.

"ON"?

YES

WHILE OBSERVING

DOES THE DRB

THE DISPLAY, PRESS

DISPLAY SET SWITCH 

NO 

REPLACE THE SET

THE SET SWITCH "PRESSED" OR 

SWITCH.* 

SEVERAL TIMES. "RELEASED"?

YES

WHILE OBSERVING

DOES THE DRB

THE DISPLAY, PRESS

DISPLAY RESUME 

NO 

PERFORM TEST 

THE RESUME SWITCH 

SWITCH "PRESSED"

SC-3A. 

SEVERAL TIMES. OR 

"RELEASED"?

YES

WHILE OBSERVING

DOES THE DRB

THE DISPLAY, PRESS

DISPLAY CANCEL 

NO 

REPLACE THE CANCEL 

THE CANCEL SWITCH 

SWITCH "PRESSED"

SWITCH.* 

SEVERAL TIMES. OR 

"RELEASED"?

YES

PERFORM TEST 

SC-4A. 

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

533

TEST SC-1B

CHECKING SPEED CONTROL OPERATION

Perform TEST SC-1A Before Proceeding

FIG. 1

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

534

TEST SC-1B

CHECKING SPEED CONTROL OPERATION

Perform TEST SC-1A Before Proceeding

*Perform Verification TEST VER-4A.

**Check connectors - Clean / repair as necessary.

KEY OFF, DISCONNECT 

START TEST THE SPEED CONTROL

IS 

ANY TERMINAL 

YES

REPAIR AS 

SC-1B. SERVO CONNECTOR.** 

DAMAGED, 

PUSHED 

NECESSARY.*

OUT OR MISWIRED?

SEE GENERAL INFO 4.2

NO 

USING AN OHMMETER,
MEASURE RESISTANCE 

IS 

THE RESISTANCE NO REPAIR 

THE OPEN 

OF THE GROUND 

BELOW 5.0 OHMS?

GROUND CIRCUIT.*

CIRCUIT TO GROUND.

FIG. 1

YES

IGNITION ON. WITH 

USING A VOLTMETER

THE DRB, ACTUATE

MEASURE THE S/C

IS THE VOLTAGE

NO 

PERFORM TEST 

THE S/C VENT 

BRAKE SWITCH OUTPUT 

ABOVE 10.0 VOLTS? 

SC-1D. 

SOLENOID.

CKT AT S/C

CONNECTOR. FIG. 

1

YES

RECONNECT THE SPEED

TURN ENGINE OFF

CONTROL SERVO

(IGNITION ON). WITH 

DOES THE THROTTLE 

YES

PERFORM TEST 

CONNECTOR. START

THE DRB, ACTUATE THE

OPEN AND CLOSE? 

SC-5A. 

ENGINE, ALLOW TO SPEED CONTROL SERVO

IDLE 1 MINUTE.

SOLENOIDS. 

NO 

KEY OFF, DISCONNECT 

ATTACH A VACUUM 

THE VACUUM SUPPLY TO 

GAUGE TO THE

DOES THE VACUUM 

NO 

REPAIR THE VACUUM 

THE SPEED CONTROL

DISCONNECTED HOSE.

GAUGE READ 

SUPPLY FOR A LEAK 

SERVO. 

START ENGINE.

MANIFOLD VACUUM?

OR RESTRICTION.*

SEE GENERAL INFO 4.2

YES

TURN ENGINE OFF, 

OBSERVE THE VACUUM DOES 

THE VACUUM 

NO 

REPLACE THE VACUUM 

GAUGE FOR 10 

HOLD FOR AT LEAST

RESERVOIR.*

SECONDS. 10.0 

SECONDS? 

YES

PERFORM TEST 

SC-1C. 

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

535