Pinpoint Test D: Exhaust Heat EXCHANGER Exhaust Bypass Valve
WARNING: This page is about a different car, the 2022 Ford Police Interceptor Utility and 2022 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to ELECTRONIC ENGINE CONTROLS - HYBRID
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 7 (20A).
- PCM
- Frozen valve / Broken linkages
- Valve alignment
- Faulty position sensor
- Clogged heat exchanger
- Hoses
- Coolant leaks
- ECT 3 and ECT 4 failures
- 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 D7 - D2 CHECK THE EXHAUST HEAT EXCHANGER PID
- Access the PCM and monitor the EHE_EBVA_POS_STPID
Does the scan tool indicate a misaligned valve?
Yes SWITCH the ignition to the OFF position. GO to D3 No GO to D7 - 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.
Was DTC P237C, P237D, P237E, P237F, P2C22 or P2C23 set and does the scan tool indicate a misaligned valve?
Yes INSTALL a new RH exhaust flexible pipe. REFER to: Exhaust Flexible Pipe . No CLEAR Diagnostic Trouble Codes (DTCs). GO to D4 - D4 CHECK THE BJB (BATTERY JUNCTION BOX) FUSE 7
- Disconnect BJB Fuse 7 (20A).
- Visually inspect the BJB Fuse 7.
Is the Fuse blown?
Yes Repair the circuit for a short to ground. Install a new fuse. No GO to D5 - D5 CHECK THE EXHAUST HEAT EXCHANGER BYPASS VALVE SUPPLY CIRCUIT FOR AN OPEN
- Install BJB Fuse 7 (20A).
- Disconnect Exhaust heat exchanger exhaust bypass valve C4467 .
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C4467-3 Ground
Is battery voltage present?
Yes GO to D6 No REPAIR the circuit. - D6 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure:
Positive Lead Measurement / Action Negative Lead C4467-1 Ground
Is the resistance less then 5 ohms?
Yes GO to D7 No REPAIR the circuit. - D7 CHECK THE EXHAUST HEAT EXCHANGER BYPASS VALVE CONTROL CIRCUITS FOR A SHORT TO VOLTAGE
- Disconnect PCM C175T .
- Disconnect Exhaust heat exchanger exhaust bypass valve C4467 .
- Ignition ON.
Is there any voltage present?
Yes REPAIR the circuit. No GO to D8 - D8 CHECK THE EXHAUST HEAT EXCHANGER BYPASS VALVE CONTROL CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
Are the resistances greater than 10, 000 ohms?
Yes GO to D9 No REPAIR the circuit. - D9 CHECK THE EXHAUST HEAT EXCHANGER BYPASS VALVE CONTROL CIRCUITS FOR AN OPEN
Are the resistances less than 3 ohms?
Yes GO to D10 No REPAIR the circuit. - D10 CHECK THE EXHAUST HEAT EXCHANGER EXHAUST BYPASS VALVE CIRCUITS FOR A SHORT TOGETHER
- Measure:
Positive Lead Measurement / Action Negative Lead C4467-1 C4467-2 C4467-1 C4467-3 C4467-1 C4467-4 C4467-2 C4467-3 C4467-2 C4467-4 C4467-3 C4467-4
Are the resistances greater than 10, 000 ohms?
Yes GO to D11 No REPAIR the circuit. - Measure:
- D11 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, INSTALL a new PCM. Refer to POWERTRAIN CONTROL MODULE (PCM) . If the condition is still present, INSTALL a new RH exhaust flexible pipe. REFER to: Exhaust Flexible Pipe . 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.