DTC Description

DESCRIPTION

ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition.

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

DTC DETECTION LOGIC

DTC		M.U.T.-III SE screen terms (Trouble diagnosis content)	DTC detection condition
P050B	00	COLD START CONTROL (Cold start ignition timing performance)	Diagnosis condition	—
			Signal (terminal)	—
			Threshold	ECM does not control ignition timing properly when engine is started with pre-warming up condition
			Diagnosis delay time	—

POSSIBLE CAUSE

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

1.CHECK DTC PRIORITY

If DTC P050B is displayed with other DTC, first perform the trouble diagnosis for other DTC.

Is applicable DTC detected?

Perform diagnosis of applicable. Refer to DTC Index

2.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

3.PERFORM DTC CONFIRMATION PROCEDURE-1

With M.U.T.-III SE

With GST

Follow the procedure “With M.U.T.-III SE” above.

Is the value of “COOLANT TEMP/S” between 15°C (59°F) and 36°C (97°F)?

-1 [If it is below 15°C (59°F)]Warm up the engine until the value of “COOLANT TEMP/S” reaches 15°C (59°F) or more. Retry from step 2.

-2 [If it is above 36°C (97°F)]Cool engine down to less than 36°C (97°F). Retry from step 2.

4.PERFORM DTC CONFIRMATION PROCEDURE-2

With M.U.T.-III SE

Set the select lever in N range.
Start the engine and warm up in idle with the value of “COOLANT TEMP/S” between 15°C (59°F) and 40°C (104°F) for more than 15 seconds.
Check 1st trip DTC.

With GST

Follow the procedure “With M.U.T.-III SE” above.

Is 1st trip DTC detected?

-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident

-2Confirmation after repair: INSPECTION END