DTC P2457:16 [MZ-CD 1.6]

id0102g8257200

DTC P2457:16

EGR cooler bypass valve position sensor circuit low
DETECTION CONDITION
•  The PCM monitors the input signal from the EGR cooler bypass valve position sensor. If the voltage from the EGR cooler bypass valve position sensor is less than 0.5 V, the PCM determines that there is a malfunction in the EGR cooler bypass valve position sensor circuit.
POSSIBLE CAUSE
•  EGR cooler bypass valve position sensor connector or terminal malfunction
•  Short to ground in wiring harness between EGR cooler bypass valve position sensor terminal A and PCM terminal 2Y
•  Short to ground in wiring harness between EGR cooler bypass valve position sensor terminal C and PCM terminal 2AJ
•  EGR cooler bypass valve position sensor malfunction
•  PCM connector or terminal malfunction
•  EGR cooler bypass valve position sensor signal circuit and ground circuit are shorted to each other
•  Open circuit in wiring harness between EGR cooler bypass valve position sensor terminal C and PCM terminal 2AJ
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform the repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT EGR COOLER BYPASS VALVE POSITION SENSOR CONNECTOR FOR POOR CONNECTION
•  Switch the ignition to off.
•  Disconnect the EGR cooler bypass valve position sensor connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 9.
No
Go to the next step.
4
INSPECT EGR COOLER BYPASS VALVE POSITION SENSOR CIRCUIT FOR SHORT TO GROUND
•  Inspect for continuity between the following terminals and body ground:
―  EGR cooler bypass valve position sensor terminal A (wiring harness-side) and body ground
―  EGR cooler bypass valve position sensor terminal C (wiring harness-side) and body ground
•  Is there continuity?
Yes
If the short to ground circuit could be detected:
•  Repair or replace the wiring harness for a possible short to ground.
If the short to ground circuit could not be detected:
•  Replace the PCM (short to ground in the PCM internal circuit).
Go to Step 9.
No
Go to the next step.
5
INSPECT EGR COOLER BYPASS VALVE POSITION SENSOr
•  Inspect the EGR cooler bypass valve position sensor.
•  Is there any malfunction?
Yes
Replace the EGR cooler bypass valve position sensor, then go to Step 9.
No
Go to the next step.
6
INSPECT PCM CONNECTOR FOR POOR CONNECTION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 9.
No
Go to the next step.
7
INSPECT EGR COOLER BYPASS VALVE POSITION SENSOR SIGNAL CIRCUIT AND GROUND CIRCUIT FOR SHORT TO EACH OTHER
•  EGR cooler bypass valve position sensor and PCM connectors are disconnected.
•  Inspect for continuity between EGR cooler bypass valve position sensor terminals A and B (wiring harness-side).
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to each other, then go to Step 9.
No
Go to the next step.
8
INSPECT EGR COOLER BYPASS VALVE POSITION SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Inspect for continuity between EGR cooler bypass valve position sensor terminal C and PCM terminal 2AJ.
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
9
VERIFY THAT DTC P2457:16 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZ-CD 1.6].)
Go to the next step.
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
•  Perform the after repair procedure.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
No
DTC troubleshooting completed.