DTC P0405 [MZ-CD 1.6 (Y6)]

id0102c3820600

DTC P0405

EGR valve position sensor circuit low input

DETECTION CONDITION

•  The PCM monitors the EGR valve position sensor signal. If the voltage at PCM terminal 129 remains low, the PCM determines that there is a EGR valve position sensor circuit problem.

POSSIBLE CAUSE

•  EGR valve position sensor malfunction

•  Connector or terminal malfunction

•  Open circuit in the wiring harness between EGR valve position sensor terminal B and PCM terminal 129

•  Open circuit in the wiring harness between EGR valve position sensor terminal E and PCM terminal 201

•  Short to ground in the wiring harness between EGR valve position sensor terminal B and PCM terminal 129

•  PCM malfunction

DTC P0405	EGR valve position sensor circuit low input
DETECTION CONDITION	• The PCM monitors the EGR valve position sensor signal. If the voltage at PCM terminal 129 remains low, the PCM determines that there is a EGR valve position sensor circuit problem.
POSSIBLE CAUSE	• EGR valve position sensor malfunction • Connector or terminal malfunction • Open circuit in the wiring harness between EGR valve position sensor terminal B and PCM terminal 129 • Open circuit in the wiring harness between EGR valve position sensor terminal E and PCM terminal 201 • Short to ground in the wiring harness between EGR valve position sensor terminal B and PCM terminal 129 • 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.
1		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.
2		No	Go to the next step.
3	VERIFY CURRENT SIGNAL STATUS: IS CONCERN INTERMITTENT OR CONSTANT? • Connect the M-MDS to the DLC-2. • 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	Go to the next step.
3		No	Intermittent concern exists. Perform the “INTERMITTENT CONCERNS TROUBLESHOOTING”. (See INTERMITTENT CONCERN TROUBLESHOOTING [MZ-CD 1.6 (Y6)].)
4	CLASSIFY MALFUNCTION AS EGR VALVE POSITION SENSOR POWER CIRCUIT OR SIGNAL CIRCUIT MALFUNCTION • Turn the engine switch off. • Disconnect the EGR valve position sensor connector. • Turn the engine switch to the ON position (Engine off). • Measure the voltage between EGR valve position sensor terminal E (wiring harness-side) and body ground. • Is the voltage approx. 5.0 V?	Yes	Go to Step 8.
4		No	Go to the next step.
5	INSPECT EGR VALVE POSITION SENSOR POWER CIRCUIT FOR OPEN • Turn the engine switch off. • Disconnect the EGR valve position sensor connector. • Turn the engine switch to the ON position (Engine off). • Measure the voltage between PCM terminal 201 (wiring harness-side) and body ground. • Is the voltage approx. 5.0 V?	Yes	Repair or replace the wiring harness between EGR valve position sensor terminal E (wiring harness-side) and PCM terminal 201 (wiring harness-side), then go to Step 16.
5		No	Go to the next step.
6	INSPECT EGR VALVE POSITION SENSOR POWER CIRCUIT FOR SHORT TO GROUND • Turn the engine switch off. • Disconnect the PCM connector. • Inspect for continuity between PCM terminal 201 (wiring harness-side) and body ground • Is there continuity?	Yes	Repair or replace the wiring harness between EGR valve position sensor terminal E (wiring harness-side) and PCM terminal 201 (wiring harness-side), then go to Step 16.
6		No	Go to the next step.
7	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • 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 16.
7		No	Go to Step 16.
8	CLASSIFY EGR VALVE POSITION SENSOR SIGNAL CIRCUIT MALFUNCTION FOR OPEN OR SHORT TO GROUND • Turn the engine switch off. • Connect the 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 between 0.2–4.8 V?	Yes	Go to the next step.
8		No	Go to Step 11.
9	INSPECT EGR VALVE POSITION SENSOR SIGNAL CIRCUIT FOR OPEN • Turn the engine switch to the ON position (Engine off). • Measure the voltage between PCM terminal 129 (wiring harness-side) and body ground. • Is the voltage between 0.2–4.8 V?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness between EGR valve position sensor terminal B (wiring harness-side) and PCM terminal 129 (wiring harness-side), then go to Step 16.
10	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • 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 16.
10		No	Go to Step 16.
11	CLASSIFY EGR VALVE POSITION SENSOR SIGNAL CIRCUIT MALFUNCTION FOR SHORT TO GROUND OR EGR VALVE POSITION SENSOR • Turn the engine switch off. • Disconnect the EGR valve position sensor connector. • Inspect for continuity between the EGR valve position sensor terminal B (wiring harness-side) and body ground • Is there continuity?	Yes	Go to the next step.
11		No	Go to Step 14.
12	INSPECT EGR VALVE POSITION SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND • Turn the engine switch off. • Disconnect the EGR valve position sensor connector and the PCM connector. • Inspect for continuity between the EGR valve position sensor terminal 129 (wiring harness-side) and body ground • Is there continuity?	Yes	Repair or replace the wiring harness between EGR valve position sensor terminal B (wiring harness-side) and PCM terminal 129 (wiring harness-side), then go to Step 16.
12		No	Go to the next step.
13	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • 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 16.
13		No	Go to Step 16.
14	INSPECT EGR VALVE POSITION SENSOR • Inspect the EGR valve position sensor. (See EGR VALVE POSITION SENSOR INSPECTION [MZ-CD 1.6 (Y6)].) • Is there any malfunction?	Yes	Replace the EGR valve position sensor, then go to Step 16.
14		No	Go to the next step.
15	INSPECT EGR VALVE POSITION SENSOR CONNECTOR FOR POOR CONNECTION • Turn the engine switch off. • Disconnect the EGR 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 the next step.
15		No	Go to the next step.
16	VERIFY THAT DTC P0405 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	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [MZ-CD 1.6 (Y6)].)
16		No	Go to the next step.
17	VERIFY AFTER REPAIR PROCEDURE • Perform the after repair procedure. (See AFTER REPAIR PROCEDURE [MZ-CD 1.6 (Y6)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZ-CD 1.6 (Y6)].)
17		No	DTC troubleshooting completed.