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P2099-DOWNSTREAM FUEL TRIM SYSTEM 2 RICH (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes EXHAUST LEAK ENGINE MECHANICAL 2/2 O2 SENSOR (K342) O2 SENSOR 2/2 SIGNAL CIRCUIT (K399) O2 SENSOR 2/2 HEATER CONTROL CIRCUIT (K904) O2 RETURN DOWNSTREAM CIRCUIT FUEL CONTAMINATION Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC NOTE: Check the vehicle repair history. If the 2/2 O2 has been replaced make sure that the O2 sensor was NOTE: Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved sil- With a scan tool, read DTCs. Is the DTC active at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 658 ENGINE ELECTRICAL DIAGNOSTICS ND |