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(P0173) FUEL SYSTEM 2/1 RICH CONTROL OVER LIMIT (AT LOAD) (CONTINUED) 9. O2 SENSOR Turn the ignition off. Disconnect the O2 Sensor harness connector. Note: Check connectors — Clean/repair as necessary. With the DRB III T , monitor the O2 Sensor voltage. The O2 Sensor voltage should read 0.47 volt on the DRB III T with the harness connector disconnected. Connect a jumper wire between the O2 Sensor Signal circuit and the Note: The voltage should drop from 0.47 volt down to 0.0 volt Did the O2 Sensor voltage drop from 0.47 volt to 0.0 volt? Yes >> Replace the Oxygen Sensor. (Refer to 14 - FUEL SYS- TEM/FUEL INJECTION/O2 SENSOR - REMOVAL). Perform POWERTRAIN VERIFICATION TEST - VER 2. No >> Go To 10 10. O2 SENSOR SIGNAL CIRCUIT With the ignition on. With the DRB III T , monitor the O2 Sensor voltage. Is the voltage below 0.45 volt? Yes >> Go To 11 No >> Check the O2 Signal circuit for a short to ground, open, or short to voltage. Inspect the O2 Sensor connector and the CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL). Perform POWERTRAIN VERIFICATION TEST - VER 2. ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 257 |