Pinpoint Test K: LH (Left-Hand) Tailpipe Actuator Faults

WARNING: This page is about a different variant/trim than selected.

Refer to ELECTRONIC ENGINE CONTROLS - 2.3L for schematic and connector information.

Normal Operation and Fault Conditions

There is a tailpipe actuator in the inboard muffler tailpipe to control exhaust noise. The PCM uses a PWM circuit to control the operation of the tailpipe actuator. A second PWM circuit is used by the tailpipe actuator to relay actuator position and faults back to the PCM. The PCM opens the actuators based on engine load, engine RPM and vehicle speed. In normal or Snow/Wet modes, with the engine running, the actuators partially open (45 degrees). Putting the vehicle exhaust mode into Sport , forces the actuators to almost full open. Putting the vehicle exhaust mode into Track or Drag Strip , forces the actuators to full open. Refer to the Owner's Literature for more information. The valve position can be verified by looking into the inboard muffler outlet pipes.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P2BF8:00	Exhaust Flow Control Valve 'B' Control Circuit/Open: No Sub Type Information	This DTC sets when an open is detected on the LH tailpipe actuator control circuit.
PCM P2BF9:00	Exhaust Flow Control Valve 'B' Control Circuit Low: No Sub Type Information	This DTC sets when a short to ground is detected on the LH tailpipe actuator control circuit.
PCM P2BFA:00	Exhaust Flow Control Valve 'B' Control Circuit High: No Sub Type Information	This DTC sets when a short to voltage is detected on the LH tailpipe actuator control circuit.
PCM P2BFB:00	Exhaust Flow Control Valve 'B' Control Performance: No Sub Type Information	This DTC sets when the LH tailpipe actuator is stuck in the open, closed or in an unknown position.
PCM P2BFD:00	Exhaust Flow Control Valve 'B' Position Circuit Range/Performance: No Sub Type Information	This DTC sets when an circuit fault is detected on the LH tailpipe feedback circuit.

Possible Sources

LH tailpipe actuator
PCM
Wiring, terminals or connectors

K1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Start the engine.

Using a diagnostic scan tool, perform the KOERPCM selftest.

Are Diagnostic Trouble Codes (DTCs) P2BF8, P2BF9, P2BFA, P2BFB or P2BFD present?

Yes	If Diagnostic Trouble Codes (DTCs) P2BF8, P2BF9, P2BFA or P2BFD are present or if DTC P2BFB is present along with P2BF8, P2BF9, P2BFA or P2BFD GO to K4 If DTC P2BFB is the only tailpipe actuator DTC present GO to K2

No	The system is operating correctly at this time. The DTC may have been set as a result of other DTC(s), high network traffic or an intermittent fault condition.

K2 CHECK THE LH (LEFT-HAND) TAILPIPE ACTUATOR PID (PARAMETER IDENTIFICATION) FOR A MECHANICAL FAULT

Start the engine.

Using the diagnostic scan tool, view PCM Parameter Identifications (PIDs).

Monitor the EFCV_B_MON_STAT PID.

Using the PID EFCV_B_CMD open the tailpipe actuator in 10% increments until it has reached 100% (fully open).

Using the PID EFCV_B_CMD close the tailpipe actuator in 10% increments until it has reached 0% (fully closed).

Does the EVCV_B_MON_STAT PID display a mechanical fault?

Yes

GO to K3

No	The system is operating correctly at this time. The DTC may have been set as a result of a temporary restriction caused by debris in the actuator valve.

K3 REMOVE AND INSPECT THE LH (LEFT-HAND) TAILPIPE ACTUATOR
- Remove and inspect the LH tailpipe actuator. REFER to: Exhaust Tailpipe Actuator .
Were there any problems identified during the inspection?

Yes REPAIR as necessary. INSTALL the tailpipe actuator and CHECK the system for normal operation.

No INSTALL a new actuator.

K4 CHECK TAILPIPE ACTUATOR POWER

Disconnect LH TAILPIPE ACTUATOR C4474 .

Ignition ON.

Measure and record:

Positive Lead	Measurement / Action	Negative Lead
Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY	Courtesy of FORD MOTOR COMPANY

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4474-3	Courtesy of FORD MOTOR COMPANY	C4474-1

Is the connector voltage within 0.5V of the recorded battery voltage?

Yes

GO to K5

GO to K8

K5 CHECK THE LH (LEFT-HAND) TAILPIPE ACTUATOR PWM (PULSE WIDTH MODULATION) CIRCUITS FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect PCM C1551B .

Ignition ON.

Perform a wiggle test on the tailpipe actuator wiring and measure:

Positive Lead	Measurement / Action	Negative Lead
C4474-2	Courtesy of FORD MOTOR COMPANY	Ground
C4474-4	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to K6

K6 CHECK THE LH (LEFT-HAND) TAILPIPE ACTUATOR PWM (PULSE WIDTH MODULATION) CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4474-2	Courtesy of FORD MOTOR COMPANY	Ground
C4474-4	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to K7

No	REPAIR the circuit.

K7 CHECK THE LH (LEFT-HAND) TAILPIPE ACTUATOR PWM (PULSE WIDTH MODULATION) CIRCUITS FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4474-2	Courtesy of FORD MOTOR COMPANY	C1551B-60
C4474-4	Courtesy of FORD MOTOR COMPANY	C1551B-9

Is the resistance less than 3 ohms?

Yes	INSTALL a new LH TAILPIPE ACTUATOR. REFER to: Exhaust Tailpipe Actuator . CLEAR the DTC. RERUN the PCM self-test. If the DTC returns, GO to K13

No	REPAIR the circuit.

K8 CHECK THE TAILPIPE ACTUATOR GROUND CIRCUIT

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4474-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes

GO to K10

No	REPAIR the circuit.

K9 CHECK THE EXHAUST VALVES FUSE
- Check BJB Exhaust Valve fuse F34 (15A).
Is the BJB Exhaust Valve fuse F34 (15A) OK?

Yes REPAIR the circuit for an open.

No GO to K10

K10 CHECK THE EXHAUST VALVES RELAY
- Carry out the Relay Component Test. Refer to OEM WIRING DIAGRAMS COMPONENT TESTING for schematic and connector information.
Is a concern present?

Yes INSTALL a new Exhaust Valves relay.

No GO to K11

K11 CHECK POWER CIRCUIT FOR A SHORT TO GROUND

Disconnect RH TAILPIPE ACTUATOR C4473 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4474-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to K12

No	REPAIR the circuit.

K12 CHECK LH (LEFT-HAND) TAILPIPE ACTUATOR FOR INTERNAL SHORT

Connect RH TAILPIPE ACTUATOR C4473 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4474-3	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes	INSTALL a new LH TAILPIPE ACTUATOR. REFER to: Exhaust Tailpipe Actuator

GO to K13

K13 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect the PCM connectors.

Disconnect the LH tailpipe actuator connectors.

Inspect all disconnected connectors for:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect all disconnected connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new PCM. Refer to the appropriate REMOVAL AND INSTALLATION procedure.

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.