Chrysler New Yorker. Manual — part 570

TEST TC-25A

REPAIRING - IDLE AIR CONTROL MOTOR CIRCUITS

Perform TEST DTC Before Proceeding

FIG. 1

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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.

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TEST TC-25A

CONTINUED - REPAIRING - IDLE AIR CONTROL MOTOR CIRCUITS

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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.

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