Nissan Sentra B18 (2020-2025) Service Manual: P05ec Cold Start Control

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P05ec Cold Start Control

Dtc Description

DTC Description

ECM controls fuel injection timing and fuel injection quantity when engine is started with the engine cold.

This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P05EC	COLD START CONTROL (Cold start emission reduction strategy monitoring)	Diagnosis condition	—
		Signal (terminal)	—
		Threshold	ECM does not control fuel injection timing properly when engine is started with the engine cold
		Diagnosis delay time	—

POSSIBLE CAUSE

ECM

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

CHECK DTC PRIORITY

If DTC P05EC or P2B95 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

Is applicable DTC detected?
YES >>
Perform diagnosis of applicable. Refer to DTC Index.
NO >>
GO TO 2.
PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>>
GO TO 3.
PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
4. Check that “COOLANT TEMP/S”.
  - If it is between 5°C (41°F) and 40°C (104°F) go to the following steps.
  - If it is below 5°C (41°F) warm engine up to more than 5°C (41°F) and retry from step 1.
  - If it is above 40°C (104°F) cool engine down to less than 40°C (104°F) and retry from step 1.
5. Start engine and let it idle for 5 minutes.
6. Check 1st trip DTC.
With GST

Follow the procedure “With CONSULT” above.

Is 1st trip DTC detected?
YES >>
Proceed to DTC Diagnosis Procedure.
NO-1 >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO-2 >>
Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK DTC PRIORITY

If DTC P05EC or P2B95 is displayed with other DTC, first perform the trouble diagnosis for other DTC.

Is applicable DTC detected?
YES >>
Perform diagnosis of applicable. Refer to DTC Index.
NO >>
GO TO 2.
INSPECTION START
1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC confirmation procedure. Refer to Confirmation Procedure.
4. Check 1st trip DTC.
Is the 1st trip DTC P05EC or P2B95 displayed again?
YES >>
Replace ECM. Refer to ECM : Removal & Installation.
NO >>
INSPECTION END

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