B -- GO TO DTC CHART See: Diagnostic Trouble Code Descriptions/SFI System
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (FUEL TRIM)
HINT
Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter sub-assembly.
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) 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.
(e) Read the values displayed on the Techstream at engine idles.
(f) 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 -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT SYSTEM (BANK 1 OR BANK 2))
OK -- Continue to next step.
3. CHECK THROTTLE VALVE
(a) Check for deposits around the throttle valve and throttle valve condition.
OK:
No deposits around throttle valve and throttle valve moves smoothly.
NG -- REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
OK -- Continue to next step.
4. REPLACE ECM
(a) Replace the ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and
Repair/Removal.
NEXT -- CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
5. REPAIR OR REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
(a) Repair or replace the throttle with motor body assembly See: Powertrain Management/Fuel Delivery and Air Induction/Throttle
Body/Service and Repair/Removal.
NEXT -- Continue to next step.
6. CHECK WHETHER DTC OUTPUT RECURS (DTC P050A)
NOTICE:
In this operation, the engine must be cold (the same level as the engine coolant temperature recorded in the freeze frame data).
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTCs See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing
Diagnostic Trouble Codes/DTC Check / Clear.
(e) Turn the engine switch off.
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