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P2099-DOWNSTREAM FUEL TRIM SYSTEM 2 RICH (CONTINUED) 7. (K904) O2 RETURN DOWNSTREAM CIRCUIT Measure the voltage on the (K904) O2 Return Downstream circuit in Is the voltage at 2.5 volts? Yes >> Check the fuel system for contaminants. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Check the (K904) O2 Return Downstream circuit for a short to ground, open, or short to voltage. Inspect the O2 Perform the POWERTRAIN VERIFICATION TEST. (Refer HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 839 |