DTC P2457:00 [PCM (SKYACTIV-D 2.2)]

DESCRIPTION	EGR cooler efficiency below threshold
DETECTION CONDITION	Determination conditions	• The cooling efficiency of the EGR cooler is less than 47% for a continuous 6 s.
	Preconditions	• The following conditions are met: ― Difference between the exhaust gas temperature detected by exhaust gas temperature sensor No.1 and the engine coolant temperature detected by ECT sensor No.1: 50 °C {122 °F} or more ― Exhaust gas temperature detected by exhaust gas temperature sensor No.1: 100 °C {212 °F} or more ― EGR gas temperature: 300 °C {572 °F} or less ― EGR flow volume (EGR cooler side) estimated from engine operation conditions: 5—30 g/s {0.7—3.9 lb/min} ― EGR flow volume (EGR cooler side) fluctuation amount estimated from engine operation conditions: 20 g/64 msec {0.7 oz/64 msec} ― Engine coolant temperature detected by ECT sensor No.1: 60—95 °C {140—203 °F} ― Engine speed: 500—2,500 rpm ― Amount of change in engine speed: 10,000 rpm/64 msec or less ― Fuel control amount: 200 mm³/st or less ― Barometric pressure: 72 kPa {0.73 kgf/cm², 10 psi} or more ― Intake air temperature: -10 °C {14 °F} or more ― The following DTCs are not detected: • BARO sensor: P2227:00, P2228:00, P2229:00 • EGR cooler bypass valve position sensor: P2494:00, P2495:00 • EGR cooler bypass valve: P245A:00, P245B:00, P24A5:00, P2AA5:00 • EGR valve position sensor: P0405:00, P0406:00 • EGR temperature sensor: P040B:00,P040C:00,P040D:00 • EGR valve: P0404:00,P0488:00 • ECT sensor No.1: P0116:00, P0117:00, P0118:00 • Exhaust gas temperature sensor No.1: P0545:00, P0546:00, P2080:00 • Exhaust gas pressure sensor No.1: P0472:00, P0473:00 • IAT sensor No.1: P0111:00, P0112:00, P0113:00 • MAF sensor: P0101:00 • IAT sensor No.2: P1118:00, P1119:00, P1147:00 • EGR valve control device in PCM: P16A1:00
	Drive cycle	• 2
	Self test type	• CMDTC self test
	Sensor used	• EGR temperature sensor • Exhaust gas temperature sensor No.1 • ECT sensor No.1 • EGR cooler bypass valve • CKP sensor
FAIL-SAFE FUNCTION	• Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT	• Not applicable
POSSIBLE CAUSE	• Exhaust gas temperature sensor No.1 malfunction • EGR temperature sensor malfunction • ECT sensor No.1 malfunction • EGR cooler malfunction • PCM malfunction

• The PCM calculates the EGR gas temperature before and after the EGR cooler and the cooling efficiency of the EGR cooler from the engine coolant temperature, and then performs diagnosis of the EGR cooler.

• If the calculated EGR cooler cooling efficiency is the specified value or less, the PCM determines that there is a malfunction in the EGR cooler.

• The PCM performs diagnosis when each of the preconditions during drive cycle is met. When an EGR cooler malfunction condition is met during 1 drive cycle, a malfunction is determined and a pending code is stored.

• If the PCM determines that the malfunction recurs from the next drive cycle and thereafter, it stores a DTC and turns on the check engine light.

1. Start the engine and warm it up completely.

2. Drive the vehicle at a constant speed of 50 km/h {31 mph} for 10 s, then release the accelerator pedal and decelerate to 0 km/h {0 mph}.

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related Service Bulletins and/or on-line repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is the DTC P2457:00 on FREEZE FRAME DATA?	Yes	Go to the next step.
2		No	Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
3	PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the FREEZE FRAME DATA/snapshot data on the repair order.	—	Go to the next step.
4	PURPOSE: VERIFY IF DIAGNOSTIC RESULT IS AFFECTED BY DTC OCCURRING FROM EXHAUST GAS TEMPERATURE SENSOR No.1 • Switch the ignition off, then ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) • Is a DTC related to the exhaust gas temperature sensor No.1 present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
4		No	Go to the next step.
5	PURPOSE: VERIFY IF DIAGNOSTIC RESULT IS AFFECTED BY DTC OCCURRING FROM EGR TEMPERATURE SENSOR • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) • Is a DTC related to the EGR temperature sensor present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
5		No	Go to the next step.
6	PURPOSE: VERIFY IF DIAGNOSTIC RESULT IS AFFECTED BY DTC OCCURRING FROM ECT SENSOR No.1 • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) • Is a DTC related to the ECT sensor No.1 present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
6		No	Go to the troubleshooting procedure to perform the procedure from Step 1.

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: INSPECT EGR COOLER • Inspect the EGR cooler. (See EGR COOLER INSPECTION [SKYACTIV-D 2.2].) • Is there any malfunction?	Yes	Replace the EGR cooler, then go to the next step. (See EGR COOLER REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
1		No	Go to the next step.
2	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-D 2.2)].) • Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) • Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) Go to the next step.
2		No	Go to the next step.
3	PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION • Is any other DTC or pending code stored?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
3		No	DTC troubleshooting completed.