DTC P050A: Cold Start Idle Air Control System Performance; DTC P050B: Cold Start Ignition Timing Performance: Procedure

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A AND/OR P050B)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Result

Display (DTC Output)	Proceed to
P050A and/or P050B	A
P050A and/or P050B and other DTCs	B

HINT:

If any DTCs other than P050A and P050B are output, troubleshoot those DTCs first.

B → See step 18

A: Go to next step

READ VALUE USING TECHSTREAM (FUEL TRIM)
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. Start the engine.
5. Enter the following menus: Powertrain / Engine / Data List / A/F Control System / Short FT #1 and Long FT #1, or Short FT #2 and Long FT #2.
6. Read the values displayed on the Techstream.
7. 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%.
OK → See step 14

NG: Go to next step

PERFORM ACTIVE TEST USING TECHSTREAM (VVT-iE SYSTEM)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream on.
Start the engine and warm it up.
Engine is idling.
Enter the following menus: Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank1) or Control the VVT-iE Linear (Bank2) / All Data / VVT-iE Aim Angle #1 and VVT Change Angle #1 or VVT-iE Aim Angle #2 and VVT Change Angle #2.

Perform the Active Test operation with the engine speed at 1500 RPM.

Active Test Movement Order	Difference between "VVT-iE Aim Angle" and "VVT Change Angle"
0 deg → 10 deg → 20 deg → 40 deg → 10 deg → 0 deg → 10 deg → END	Within 4 DegFR

NG → See step 10

OK: Go to next step

CHECK VENTILATION HOSE CONNECTIONS
OK

Ventilation hose is connected correctly and is not damaged.

NG → See step 11

OK: Go to next step
CHECK AIR INDUCTION SYSTEM
1. Check the air induction system for vacuum leakage.
  OK
  
  No leakage from air induction system.
NG → See step 12

OK: Go to next step
CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
1. Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil.
  OK
  
  Air cleaner filter element is not excessively contaminated with dirt or oil.
NG → See step 13

OK: Go to next step
READ VALUE USING TECHSTREAM (MAF SENSOR 1 AND MAF SENSOR 2)
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 / Data List / Primary / Engine Speed, Coolant Temp, MAF Sensor 1 and MAF Sensor 2.
5. Allow the engine to idle until the ECT reaches 75°C (167°F) or higher.
6. Read MAF Sensor 1 and MAF Sensor 2 with the engine speed at 2000 RPM.
  Standard
  
  Between 2.4 to 12.8 g/s (shift lever is in N position and A/C is OFF)
NG → See step 8

OK → See step 19

CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

Fig 1: Checking Harness And Connector (Mass Air Flow Meter - ECM)

Disconnect the E13 or E22 MAF meter connector.
Disconnect the E1 ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open)

Tester Connection	Condition	Specified Condition
E13-1 (VG) - E1-25 (VG)	Always	Below 1 Ω
E13-2 (E2G) - E1-24 (E2G)	Always	Below 1 Ω
E22-1 (VGR) - E1-23 (VG2)	Always	Below 1 Ω
E22-2 (EVGR) - E1-32 (E2G2)	Always	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Condition	Specified Condition
E13-1 (VG) or E1-25 (VG) - Body ground	Always	10 kΩ or higher
E22-1 (VGR) or E1-23 (VG2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

REPLACE MASS AIR FLOW METER (BANK 1 AND/OR BANK 2)
1. Replace the mass air flow meter. Refer to REMOVAL .
NEXT → See step 17
CHECK AND REPAIR VVT-iE SYSTEM
1. Check and repair the VVT-iE system. Refer to DISASSEMBLY .
NEXT → See step 17
REPAIR OR REPLACE VENTILATION HOSE
1. Repair or replace the ventilation hose. Refer to ON-VEHICLE INSPECTION .
NEXT → See step 17
REPAIR OR REPLACE AIR INDUCTION SYSTEM
NEXT → See step 17
REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
NEXT → See step 17
CHECK THROTTLE VALVE
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 16

OK: Go to next step
REPLACE ECM
1. Replace the ECM. Refer to REMOVAL .
NEXT → See step 17
REPAIR OR REPLACE THROTTLE BODY ASSEMBLY
1. Repair or replace the throttle body assembly. Refer to REMOVAL .
NEXT: Go to next step
CHECK WHETHER DTC OUTPUT RECURS (DTC P050A AND/OR P050B)
NOTE:
In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).
1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear DTCs. Refer to DTC CHECK / CLEAR .
5. Switch the ECM from normal mode to check mode using the Techstream. Refer to CHECK MODE PROCEDURE .
6. Start the engine to idle for a minute.
  OK
  
  Stable fast idling.
7. Read DTCs.
  OK
  
  No DTC output.
NEXT → END
GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS