Chrysler New Yorker. Manual - part 570

TEST TC-25A

REPAIRING - IDLE AIR CONTROL MOTOR CIRCUITS

Perform TEST DTC Before Proceeding

FIG. 1

T

R

O

U
B

L

E

C

O

D

E

T

E
S

T

S

116

TEST TC-25A

REPAIRING - IDLE AIR CONTROL MOTOR CIRCUITS

Perform TEST DTC Before Proceeding

*Perform Verification TEST VER-2A.

**Check connectors - Clean / repair as necessary.

START TEST 

TURN IGNITION OFF

START ENGINE,

TC-25A 

FOR 10 SECONDS. 

ALLOW TO IDLE FOR

20 SECONDS. 

NOTE:

WITH THE DRB, 

NOTE:

IF ENGINE WILL NOT

ACTUATE THE IDLE 

RELEASE THROTTLE.

NO 

CONTINUE TEST 

IDLE, HOLD THROTTLE 

AIR CONTROL MOTOR

TC-25A ON THE

OPEN SLIGHTLY TO 

TO 1400 RPM. 

IS THE ENGINE SPEED

NEXT PAGE.

KEEP ENGINE RUNNING. 

1400 +/- 100 RPM? 

YES

WITH THE DRB, 

ACTUATE THE IDLE 

IS THE ENGINE 

NO 

CONTINUE TEST 

AIR CONTROL MOTOR

SPEED 900 +/- 100

TC-25A ON THE

TO 900 RPM. 

RPM? 

NEXT PAGE.

YES

AT THIS TIME, THE

USING THE

CONDITION REQUIRED 

SCHEMATIC AS A

WERE ANY PROBLEMS 

YES

REPAIR AS 

TO SET THE CODE IS 

GUIDE, INSPECT THE

FOUND? 

NECESSARY.*

NOT PRESENT. WIRING 

AND

FIG. 1

CONNECTORS.

NO 

START ENGINE. WITH THE IDLE 

SPEED

THE DRB IN SYSTEMS

SHOULD RAISE AND

DOES THE IDLE 

NO 

CONTINUE TEST 

TESTS, PERFORM THE

LOWER WITH THE

SPEED RAISE AND

TC-25A ON THE

IAC WIGGLE TEST.

DISPLAY. 

LOWER PROPERLY?

NEXT PAGE.

YES

WIGGLE THE WIRING 

HARNESS FROM THE

OBSERVE FOR THE

DID THE IAC STOP 

YES

REPAIR THE HARNESS

IAC MOTOR TO THE

IAC MOTOR TO STOP 

OPERATING AT ANY

OR CONNECTORS AS 

PCM. OPERATING. 

TIME?

NECESSARY.*

NO 

REFER TO GEN INFO 

WITH THE DRB, STOP 

3.3.2 FOR

THE IAC WIGGLE INFORMATION ON 

TEST 

COMPLETE.* 

TEST.

INACTIVE TROUBLE

CODES. 

T

R

O

U
B

L

E

C

O

D

E

T

E
S

T

S

117

TEST TC-25A

CONTINUED - REPAIRING - IDLE AIR CONTROL MOTOR CIRCUITS

T

R

O

U
B

L

E

C

O

D

E

T

E
S

T

S

118

TEST TC-25A

CONTINUED - REPAIRING - IDLE AIR CONTROL MOTOR CIRCUITS

*Perform Verification TEST VER-2A.

**Check connectors - Clean / repair as necessary.

TEST TC-25A 

CONTINUED FROM USING THE DRB, 

THE PREVIOUS STOP 

ALL TESTS. 

PAGE.

DISCONNECT IAC

TURN IGNITION OFF. 

MOTOR HARNESS

CONNECTOR.** 

REPAIR THE IAC #1 

USING AN OHMMETER,

..IAC DRIVER #1 

IS THE RESISTANCE 

YES

DRIVER CIRCUIT

MEASURE BETWEEN... AND GROUND.

BELOW 5.0 OHMS?

SHORTED TO 

GROUND.* 

NO 

REPAIR THE IAC #2 

USING AN OHMMETER,

..IAC DRIVER #2 

IS THE RESISTANCE 

YES

DRIVER CIRCUIT

MEASURE BETWEEN... AND GROUND.

BELOW 5.0 OHMS?

SHORTED TO 

GROUND.* 

NO 

REPAIR THE IAC #3 

USING AN OHMMETER,

..IAC DRIVER #3 

IS THE RESISTANCE 

YES

DRIVER CIRCUIT

MEASURE BETWEEN... AND GROUND.

BELOW 5.0 OHMS?

SHORTED TO 

GROUND.* 

NO 

REPAIR THE IAC #4 

USING AN OHMMETER,

..IAC DRIVER #4 

IS THE RESISTANCE 

YES

DRIVER CIRCUIT

MEASURE BETWEEN... AND GROUND.

BELOW 5.0 OHMS?

SHORTED TO 

GROUND.* 

NO 

CONTINUE TEST 

TC-25A ON THE

NEXT PAGE.

T

R

O

U
B

L

E

C

O

D

E

T

E
S

T

S

119