DTC P050B: Cold Start Ignition Timing Performance: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs.
   RESULT
   
   

   Result	Proceed To
   P050B is output	A
   P050B and other DTCs are output	B

   HINT: 

   If any DTCs other than P050B are output, troubleshoot those DTCs first.

NG → See step   16 

OK: Go to next step 

HINT: 

Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter.

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2.
5. Read the values displayed on the Techstream.
6. Add together the Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values to obtain the total Fuel Trim

   Standard

   Total of Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2 values is between -20% and 20%.

NG → See step   5 

OK: Go to next step 

1. Check that there are no deposits around the throttle valve.

   OK

   No deposits around the throttle valve

NG → See step   10 

OK: Go to next step 

1. Replace ECM. Refer toREMOVAL .

NEXT → See step   15 

1. Connect the Techstream to the DLC3.
2. Start the engine and turn the Techstream on.
3. Warm up the engine.
4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).
5. Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.

   OK

   Tester Operation	Specified Condition
   OCV OFF	Normal engine speed
   OCV ON	Engine idles roughly or stalls (soon after OCV switched from OFF to ON)

NG → See step   11 

OK: Go to next step 

1. Check the PCV hose connections.

   OK

   PCV hose is connected correctly and is not damaged.

NG → See step   12 

OK: Go to next step 

1. Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil.

   OK

   The air cleaner filter element is not excessively contaminated with dirt or oil.

NG → See step   13 

OK: Go to next step 

1. Check the air induction system for vacuum leaks.

   OK

   No leak from the air induction system.

NG → See step   14 

OK: Go to next step 

1. Replace the mass air flow meter. Refer toREMOVAL .

NEXT → See step   15 

1. Repair or replace throttle with motor body assembly. Refer toREMOVAL .

NEXT → See step   15 

1. Check and repair VVT system.

NEXT → See step   15 

1. Repair or replace PCV hose.

NEXT → See step   15 

1. Replace air cleaner filter element sub-assembly.

NEXT → See step   15 

1. Repair or replace air induction system.

NEXT → See step   15 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Clear the DTCs. Refer toDTC CHECK / CLEAR .
5. Turn the ignition switch off and wait for at least 30 seconds.
6. Turn the ignition switch to ON and turn the Techstream on.
7. Start the engine and warm it up.
8. Refer to the CONFIRMATION DRIVING PATTERN .
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P050B.
11. Check the DTC judgment result.
    RESULT
    
    

    Tester Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

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