DTC P141A:00 [MZ-CD 1.6]

id0102g8477700

DTC P141A:00

EGR position sensor signal -intermittent fault
DETECTION CONDITION
•  The PCM monitors the EGR valve position sensor signal every 10 ms. If the amount of change in the EGR valve position sensor signal at each monitoring exceeds 1.0001 V/10 ms, the PCM determines that the EGR valve position sensor signal is in error.
POSSIBLE CAUSE
•  EGR valve connector or terminal malfunction
•  Short to ground in wiring harness between EGR valve and PCM
•  PCM connector or terminal malfunction
•  EGR valve and/or EGR valve position sensor terminals short to each other
•  Short to power supply in wiring harness between EGR valve and PCM
•  Open circuit in wiring harness between EGR valve and PCM
•  EGR valve malfunction
•  EGR valve position sensor malfunction
•  EGR valve stuck (contamination)
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the 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 REPAIR INFORMATION AVAILABILITY
•  Verify related service 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.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE AND/OR DTC
•  Switch the ignition to off, then to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the other PENDING CODE/DTC also present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZ-CD 1.6].)
No
Go to the next step.
4
INSPECT EGR VALVE CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the EGR valve connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 13.
No
Go to the next step.
5
INSPECT EGR VALVE POSITION SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND
•  EGR valve connector is disconnected.
•  Inspect for continuity between EGR valve terminal A (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 13.
No
Go to the next step.
6
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 13.
•  
No
Go to the next step.
7
INSPECT EGR VALVE/EGR VALVE POSITION SENSOR CIRCUIT FOR SHORT TO EACH OTHER
•  EGR valve and PCM connectors are disconnected.
•  Verify the continuity between all of the connector terminals on the EGR valve wiring harness side.
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to each other, then go to Step 13.
No
Go to the next step.
8
INSPECT EGR VALVE/EGR VALVE POSITION SENSOR CIRCUIT FOR SHORT TO GROUND
•  EGR valve and PCM connectors are disconnected.
•  Inspect for continuity between following EGR valve terminals (wiring harness-side) and body ground.
―  Terminal B
―  Terminal D
―  Terminal E
•  Is there continuity?
Yes
Repair or replace the wiring harness for a possible short to ground, then go to Step 13.
No
Go to the next step.
9
INSPECT EGR VALVE/EGR VALVE POSITION SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY
•  EGR valve and PCM connectors are disconnected.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the following EGR valve terminals (wiring harness-side).
―  Terminal A
―  Terminal B
―  Terminal C
―  Terminal D
―  Terminal E
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 13.
No
Go to the next step.
10
INSPECT EGR VALVE/EGR VALVE POSITION SENSOR CIRCUIT FOR OPEN CIRCUIT
•  EGR valve and PCM connectors are disconnected.
•  Switch the ignition to off.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  EGR valve terminal A—PCM terminal 2AL
―  EGR valve terminal B—PCM terminal 2C
―  EGR valve terminal C—PCM terminal 2Q
―  EGR valve terminal D—PCM terminal 2D
―  EGR valve terminal E—PCM terminal 2AO
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 13.
11
INSPECT EGR VALVE POSITION SENSOR
•  Inspect the EGR valve position sensor.
•  Is there any malfunction?
Yes
Replace the EGR valve, then go to Step 13.
(See EGR VALVE REMOVAL/INSTALLATION [MZ-CD 1.6].)
No
Go to the next step.
12
INSPECT EGR VALVE
•  Inspect the EGR valve for following:
―  Resistance
―  Mechanical stuck
•  Is there any malfunction?
Yes
Clean or replace the EGR valve, then go to the next step.
(See EGR VALVE REMOVAL/INSTALLATION [MZ-CD 1.6].)
No
Go to the next step.
13
VERIFY THAT DTC P141A:00 TROUBLESHOOTING IS COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Run the vehicle under the FREEZE FRAME DATA stored condition.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
14
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.