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P0172-FUEL SYSTEM 1/1 RICH (CONTINUED) 10. (K41) O2 SENSOR 1/1 SIGNAL CIRCUIT WARNING: When the engine is operating, do not stand in direct Measure the voltage on the (K41) O2 Sensor 1/1 Signal circuit in the Is the voltage above 4.8 volts? Yes >> Check the (K41) O2 Sensor 1/1 Signal circuit for damage, short to ground, open, or short to voltage. Inspect the O2 Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 11 11. (K902) O2 SENSOR UPSTREAM RETURN CIRCUIT Engine still running. Measure the voltage on the (K902) O2 Upstream Return circuit in the Is the voltage at 2.5 volts? Yes >> Go To 12 No >> Check the (K902) O2 Upstream Return circuit for damage, short to ground, open, or short to voltage. Inspect the O2 Perform the POWERTRAIN VERIFICATION TEST. (Refer NOTE: Turn the ignition off before continuing. HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 239 |