DTC P050B: Cold Start Ignition Timing Performance: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
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	A
   P050B and other DTCs	B

   HINT: 

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

B → See step   16 

A: 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. Turn the engine switch on (IG).
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.

   OK

   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 for deposits around the throttle valve and throttle valve condition.

   OK

   No deposits around throttle valve and throttle valve moves smoothly.

NG → See step   10 

OK: Go to next step 

1. Replace the ECM. Refer to REMOVAL .

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

   Operation	Specified Condition
   OCV OFF	Normal engine speed
   OCV ON	Soon after OCV switched from OFF to ON, engine idles roughly or stalls

NG → See step   11 

OK: Go to next step 

1. Start the engine.
2. Pinch the PCV hose.
3. Check the engine speed.

   OK

   The engine speed rises when the PCV hose is pinched.

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. Refer to ON-VEHICLE INSPECTION - Step 4 .

   OK

   No leakage from the air induction system.

NG → See step   14 

OK: Go to next step 

1. Replace the mass air flow meter. Refer to REMOVAL .

NEXT → See step   15 

1. Repair or replace the throttle body. Refer to REMOVAL .

NEXT → See step   15 

NEXT → See step   15 

NEXT → See step   15 

NEXT → See step   15 

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. Turn the engine switch off.
6. Turn the engine switch on (IG) 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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