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TSB Revision DIAGNOSTIC TROUBLE CODE PROCEDURES 13Ac-285 Check Conditions • Engine coolant temperature is lower than approx- imately 100 °C (212°F) when the engine is started. • Intake air temperature is lower than 60°C (140°F) when the engine is started. • Under the closed loop air/fuel ratio control. • Engine coolant temperature is higher than 77°C (171 °F). • Volume airflow sensor output frequency is 100 Hz or less. Judgment Criteria • Long-term fuel trim has continued to be higher than +12.5 percent for 5 seconds. or • Short-term fuel trim has continued to be higher than +12.5 percent for 5 seconds. Check Conditions • Engine coolant temperature is higher than approximately 100 °C (212°F) when the engine is started. • Intake air temperature is higher than 60°C (140 °F) when the engine is started. • Under the closed loop air/fuel ratio control. • Engine coolant temperature is higher than 77°C (171 °F). • Volume airflow sensor output frequency is 100 Hz or more. Judgment Criteria • Long-term fuel trim has continued to be higher than +12.5 percent for 5 seconds. or • Short-term fuel trim has continued to be higher than +17.6 percent for 5 seconds. Check Conditions • Engine coolant temperature is higher than approximately 100 °C (212°F) when the engine is started. • Intake air temperature is higher than 60°C (140 °F) when the engine is started. • Under the closed loop air/fuel ratio control. • Engine coolant temperature is higher than 77°C (171 °F). • Volume airflow sensor output frequency is 100 Hz or less. Judgment Criteria • Long-term fuel trim has continued to be higher than +12.5 percent for 5 seconds. or • Short-term fuel trim has continued to be higher than +22.3 percent for 5 seconds. Check Conditions • Engine coolant temperature is higher than 77°C (171 °F). • Under the closed loop air/fuel ratio control. Judgment Criteria • Long-term fuel trim has continued to be +12.5 percent for 5 seconds. or • Short-term fuel trim has continued to be +25.0 percent for 5 seconds. . TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: ) • Volume airflow sensor failed. • Injector (Number 2, 4, 6) failed. • Incorrect fuel pressure. • Air drawn in from gaps in gasket, seals, etc. • Right bank heated oxygen sensor failed. • Engine coolant temperature sensor failed. • Intake air temperature sensor failed. • Barometric pressure sensor failed. • Exhaust leak. • Use of incorrect or contaminated fuel. • PCM failed. DIAGNOSIS Required Special Tool: • MB991502: Scan Tool (MUT-II) STEP 1. Check the exhaust leaks. YES : Go to Step 2. |