DTC P1402 [WL-3]

id0102b8837400

DTC P1402

EGR valve position sensor circuit malfunction
DETECTION CONDITION
•  If the PCM detects that the EGR valve position sensor voltage at PCM terminal 1F is below 0.10 V or above 4.90 V after engine start, the PCM determines that the EGR valve position circuit has a malfunction.
POSSIBLE CAUSE
•  EGR valve position sensor malfunction
•  Connector or terminal malfunction
•  Open circuit between EGR valve position sensor terminal C and PCM terminal 1F.
•  Short to ground circuit between EGR valve position sensor terminal C and PCM terminal 1F.
•  Open circuit between EGR valve position sensor terminal B and PCM terminal 1A.
•  Short to ground circuit between EGR valve position sensor terminal B and PCM terminal 1A.
•  Open circuit between EGR valve position sensor terminal A and PCM terminal 1B
•  Short to reference voltage (Vref) supply circuit between EGR valve position sensor terminal C and PCM terminal 1F
•  PCM malfunction
•  MAF sensor malfunction
•  Electrical corrosion in EGR valve position signal circuit
•  Voltage drops in ground circuit or reference voltage (Vref) supply circuit

Diagnostic procedure

STEP

INSPECTION

ACTION
1
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.
2
VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT?
•  Clear the DTC.
•  Start the engine.
•  Is the same DTC present?
Yes
Go to the next step.
No
Intermittent concern exists.
Perform the “INTERMITTENT CONCERN TROUBLESHOOTING”.
(See INTERMITTENT CONCERN TROUBLESHOOTING [WL-3].)
3
INSPECT EGR VALVE POSITION SENSOR CONNECTOR
•  Turn the engine switch to the off position.
•  Disconnect the EGR valve position sensor connector.
•  Check for poor connection (damaged, pulled-out pins, corrosion, etc.).
•  Are there any concerns?
Yes
Repair the terminal, then go to Step 18.
No
Go to the next step.
4
CHECK POWER SUPPLY CIRCUIT VOLTAGE AT EGR VALVE POSITION SENSOR CONNECTOR
•  Turn the engine switch to the ON position (Engine off).
•  Measure the voltage between EGR valve position sensor terminal B (wiring harness-side) and body ground.
•  Is the voltage within 4.5— 5.5 V?
Yes
Go to Step 9.
No
•  If the voltage is B+, repair or replace the shorted wiring harness, then go to Step 18.
•  If the voltage is approx. 0 V, go to the next step.
5
INSPECT EGR VALVE POSITION SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND
•  Check for continuity between EGR valve position sensor terminal B (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the shorted wiring harness, then go to Step 18.
No
Go to the next step.
6
INSPECT EGR VALVE POSITION SENSOR POWER SUPPLY AND GROUND CIRCUIT FOR SHORT TO EACH OTHER
•  Check for continuity between EGR valve position sensor terminals B (wiring harness-side) and A (wiring harness-side).
•  Is there continuity?
Yes
Repair or replace the shorted wiring harness, then go to Step 18.
No
Go to the next step.
7
CHECK PCM CONNECTOR
•  Disconnect the PCM connector.
•  Check for poor connection at terminal 1A (damaged, pulled-out pins, corrosion, etc.).
•  Is there any concern?
Yes
Repair the terminal, then go to Step 18.
No
Go to the next step.
8
VERIFY EGR VALVE POSITION SENSOR POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT
•  Check for continuity between EGR valve position sensor terminal B (wiring harness-side) and PCM terminal 1A (wiring harness-side).
•  Is there continuity?
Yes
Go to Step 18.
No
Repair or replace the suspected wiring harness, then go to Step 18.
9
CHECK SIGNAL CIRCUIT VOLTAGE AT EGR VALVE POSITION SENSOR CONNECTOR
•  Turn the engine switch to the ON position (Engine off).
•  Measure the voltage between EGR valve position sensor terminal C (wiring harness-side) and body ground.
•  Is the voltage within 4.5— 5.5 V?
Yes
Go to Step 15.
No
•  If the voltage is B+, repair or replace the shorted wiring harness, then go to Step 18.
•  If the voltage is approx. 0 V, go to Step 11.
10
INSPECT EGR VALVE POSITION SENSOR POWER SUPPLY AND SIGNAL CIRCUIT FOR SHORT TO EACH OTHER
•  Check for continuity between EGR valve position sensor terminals B (wiring harness-side) and C (wiring harness-side).
•  Is there continuity?
Yes
Repair or replace the shorted wiring harness, then go to Step 18.
No
Go to the next step.
11
INSPECT EGR VALVE POSITION SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Check for continuity between EGR valve position sensor terminal C (wiring harness-side) and body ground.
•  Is there continuity?
Yes
Repair or replace the shorted wiring harness, then go to Step 18.
No
Go to the next step.
12
INSPECT EGR VALVE POSITION SENSOR TO THE SIGNAL AND GROUND CIRCUIT FOR SHORT EACH OTHER
•  Check for continuity between EGR valve position sensor terminals C (wiring harness-side) and A (wiring harness-side).
•  Is there continuity?
Yes
Repair or replace the shorted wiring harness, then go to Step 18.
No
Go to the next step.
13
CHECK PCM CONNECTOR
•  Disconnect the PCM connector.
•  Check for poor connection at terminal 1F (damaged, pulled-out pins, corrosion, etc.).
•  Is there any concern?
Yes
Repair the terminal, then go to Step 18.
No
Go to the next step.
14
VERIFY EGR VALVE POSITION SENSOR SIGNAL CIRCUIT FOR OPEN CIRCUIT
•  Disconnect the PCM connector.
•  Check for continuity between EGR valve position sensor terminal C (wiring harness-side) and PCM terminal 1F (wiring harness-side).
•  Is there continuity?
Yes
Go to Step 18.
No
Repair or replace the suspected wiring harness, then go to Step 18.
15
CHECK PCM CONNECTOR
•  Disconnect the PCM connector.
•  Check for poor connection at terminal 1B (damaged, pulled-out pins, corrosion, etc.).
•  Is there any concern?
Yes
Repair the terminal, then go to Step 18.
No
Go to the next step.
16
VERIFY EGR VALVE POSITION SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  Check for continuity between EGR valve position sensor terminal A (wiring harness-side) and PCM terminal 1B (wiring harness-side).
•  Is there continuity?
Yes
Go to the next step.
No
Repair or replace the suspected wiring harness, then go to Step 18.
17
INSPECT EGR VALVE POSITION SENSOR
•  Perform the EGR valve position sensor inspection.
•  Is the EGR position sensor normal?
Yes
Go to the next step.
No
Replace the EGR valve position sensor, then go to the next step.
18
VERIFY TROUBLESHOOTING OF DTC P1402 COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Start the engine.
•  Clear the DTCs from the PCM memory using the M-MDS.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
No
Go to the next step.
19
VERIFY AFTER REPAIR PROCEDURE
•  Perform “After Repair Procedure”
•  Is there any DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [WL-3].)
No
Troubleshooting completed.