Chrysler New Yorker. Manual — part 678

TEST SC-4A

CHECKING THE BRAKE SWITCH SENSE

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

548

TEST SC-4A

CHECKING THE BRAKE SWITCH SENSE

Perform TEST SC-1A Before Proceeding

*Perform Verification TEST VER-4A.

**Check connectors - Clean / repair as necessary.

WHILE OBSERVING

DOES THE DRB

START TEST THE DRB DISPLAY,

DISPLAY COAST

NO

REPLACE THE COAST

SC-4A. PRESS THE COAST

SWITCH

"PRESSED"

SWITCH.*

SWITCH SEVERAL

OR "RELEASED"?

TIMES.

YES

WHILE OBSERVING

DOES THE DRB

THE DRB DISPLAY, DISPLAY BRAKE

YES

PERFORM TEST

PRESS THE BRAKE

SWITCH "PRESSED"

SC-1A

PEDAL SEVERAL

OR "RELEASED"?

CONTINUED.

TIMES.

NO

DISCONNECT THE BRAKE

KEY ON, USING A

SWITCH HARNESS

VOLTMETER, MEASURE

CONNECTOR.** THE VOLTAGE OF

THE

BRAKE SWITCH

SEE GENERAL INFO 4.7

SENSE...

CIRCUIT AT THE

BRAKE SWITCH

IS THE VOLTAGE

NO

CONTINUE TEST

CONNECTOR.

ABOVE 10.0 VOLTS?

SC-4A ON THE

NEXT PAGE.

FIG. 1

YES

CONNECT A JUMPER

BETWEEN THE BRAKE

WITH THE DRB, READ

DOES THE DRB

YES

REPLACE THE BRAKE

SWITCH SENSE AND

THE BRAKE SWITCH

DISPLAY BRAKE SW

SWITCH.*

GROUND IN BRAKE

INPUT STATUS.

"RELEASED"?

SWITCH CONN.

FIG. 1

NO

REPAIR THE OPEN
GROUND CIRCUIT.*

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

549

TEST SC-4A

CONTINUED - CHECKING THE BRAKE SWITCH SENSE

FIG. 1

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

550

TEST SC-4A

CONTINUED - CHECKING THE BRAKE SWITCH SENSE

*Perform Verification TEST VER-4A.

**Check connectors - Clean / repair as necessary.

TEST SC-4A

KEY OFF, DISCONNECT

CONTINUED FROM

THE POWERTRAIN

IS ANY TERMINAL

YES

REPAIR AS

THE PREVIOUS CONTROL MODULE

DAMAGED,

PUSHED NECESSARY.*

PAGE.

HARNESS CONNECTOR.** OUT OR

MISWIRED?

SEE GENERAL INFO 4.1

NO

USING AN OHMMETER,

AT PCM CONNECTOR

REPAIR THE BRAKE

MEASURE THE

TO GROUND.

IS THE RESISTANCE

YES

SWITCH SENSE

RESISTANCE OF THE

BELOW 5.0 OHMS?

CIRCUIT, SHORTED

BRAKE SWITCH SENSE

TO GROUND.*

CIRCUIT... FIG.

1

NO

MEASURE THE BRAKE

USE AN OHMMETER IN

SWITCH SENSE CKT.

IS THE RESISTANCE

YES

REPLACE THE

THE FOLLOWING

FROM THE PCM TO

BELOW 5.0 OHMS?

POWERTRAIN CONTROL

STEP.

THE BRAKE SWITCH.

MODULE.*

FIG. 1

NO

REPAIR THE OPEN

BRAKE SWITCH SENSE

CIRCUIT.

BRAKE SWITCH TO

PCM.*

S
P
E
E

D

C

O

N

T

R

O

L

T

E
S

T

S

551