Pinpoint Test D: Exhaust Heat EXCHANGER Exhaust Bypass Valve

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to ELECTRONIC ENGINE CONTROLS - 3.5L for schematic and connector information.

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P237F:00	Exhaust Heat Exchanger Exhaust Bypass Valve "A" Control Performance: No Sub Type Information	This DTC sets when the PCM senses a valid position but has not changed since start up.
PCM P2C22:00	Exhaust Heat Exchanger Exhaust Bypass Valve "A" Position Sensor Circuit: No Sub Type Information	This DTC sets when the PCM senses a valid position but has not changed since start up.
PCM P237C:00	Exhaust Heat Exchanger Exhaust Bypass Valve "A" Control Circuit/Open: No Sub Type Information	This DTC sets when the PCM senses an open circuit to the exhaust heat exchanger exhaust bypass valve.
PCM P237D:00	Exhaust Heat Exchanger Exhaust Bypass Valve "A" Control Circuit Low: No Sub Type Information	This DTC sets when the PCM senses low voltage on the exhaust heat exchanger exhaust bypass valve.
PCM P237E:00	Exhaust Heat Exchanger Exhaust Bypass Valve "A" Control Circuit High: No Sub Type Information	This DTC sets when the PCM senses high voltage on the exhaust heat exchanger exhaust bypass valve.
PCM P2C23:00	Exhaust Heat Exchanger Exhaust Bypass Valve "A" Position Sensor Performance: No Sub Type Information	This DTC sets when the PCM senses a mismatch in the commanded and received heat exchanger valve position and the coolant temperature difference between inlet and outlet is within range.

Possible Sources

Wiring, terminals or connectors
BJB Fuse 8 (20A).
PCM
Frozen valve / Broken linkages
Valve alignment
Faulty position sensor
Clogged heat exchanger
Hoses
Coolant leaks

D1 RETRIEVE AND RECORD ALL DTCS
- Start the vehicle and allow engine to reach normal operating temperatures. Using the diagnostic scan tool, retrieve all DTCs.
Was DTC P237C, P237D, P237E, P237F, P2C22 or P2C23 set?

Yes GO to D2

No GO to D4

D2 CHECK THE EXHAUST HEAT EXCHANGER PID
- Access the PCM and monitor the EHE_EBVA_POS_STPID
- Record the fault status codes.
Is fault status code 3 present?

Yes SWITCH the ignition to the OFF position. GO to D3

No GO to D4

D3 CHECK THE EXHAUST HEAT EXCHANGER FOR DAMAGE
- Visually inspect the exhaust heat exchanger for damage or signs of failure.
- Residual condensation from normal operation can freeze the exhaust heat exchanger valve restricting its movement. Using the Hybrid Engine Running Diagnostic Mode, run the engine to operating temperature to melt any residual ice build-up in the exhaust heat exchanger.
- Access the PCM and monitor the EHE_EBVA_POS_STPID
- Using the diagnostic scan tool, retrieve all DTCs.
- Record the fault status codes.
Was DTC P237C, P237D, P237E, P237F, P2C22 or P2C23 set and is fault status code 3 present?

Yes INSTALL a new muffler inlet pipe. REFER to: Muffler Inlet Pipe .

No CLEAR Diagnostic Trouble Codes (DTCs). GO to D4

D4 CHECK THE EXHAUST HEAT EXCHANGER BYPASS VALVE CIRCUITS FOR A SHORT TO VOLTAGE

Disconnect BJB Fuse 8 (20A).

Disconnect PCM C175T.

Disconnect Exhaust heat exchanger exhaust bypass valve C4633.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4633-2	Courtesy of FORD MOTOR COMPANY	Ground
C4633-3	Courtesy of FORD MOTOR COMPANY	Ground
C4633-4	Courtesy of FORD MOTOR COMPANY	Ground

Is there any voltage present?

Yes	REPAIR the circuit.

GO to D5

D5 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4633-2	Courtesy of FORD MOTOR COMPANY	Ground
C4633-3	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes

GO to D6

No	REPAIR the circuit.

D6 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CIRCUITS FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4633-1	Courtesy of FORD MOTOR COMPANY	Ground

Positive Lead	Measurement / Action	Negative Lead
C4633-3	Courtesy of FORD MOTOR COMPANY	BJB fuse 8 (20A) cavity, component side

Positive Lead	Measurement / Action	Negative Lead
C4633-2	Courtesy of FORD MOTOR COMPANY	C175T-80
C4633-4	Courtesy of FORD MOTOR COMPANY	C175T-54

Are the resistances less than 3 ohms?

Yes

GO to D7

No	REPAIR the circuit.

D7 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CIRCUITS FOR A SHORT TOGETHER

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4633-1	Courtesy of FORD MOTOR COMPANY	C4633-2
C4633-1	Courtesy of FORD MOTOR COMPANY	C4633-3
C4633-1	Courtesy of FORD MOTOR COMPANY	C4633-4
C4633-2	Courtesy of FORD MOTOR COMPANY	C4633-3
C4633-2	Courtesy of FORD MOTOR COMPANY	C4633-4
C4633-3	Courtesy of FORD MOTOR COMPANY	C4633-4

Are the resistances greater than 10, 000 ohms?

Yes

GO to D8

No	REPAIR the circuit.

D8 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all PCM connectors.

Repair:
- corrosion (replace connector or terminals - clean module pins)
- damaged or bent pins - replace terminals/pins
- pushed-out pins - replace pins as necessary

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

Operate the system and verify 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, refer to PCM GUIDED ROUTINE TESTING
Internet Explorer version 11 or greater is required to perform this Pinpoint Test. If the condition is still present, INSTALL a new muffler inlet pipe. REFER to: MUFFLER .

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.