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Test TC-65A - Right Upstream O2 Sensor Stays At Center

NOTE: For connector terminal idnetification, see CONNECTOR IDENTIFICATION DIRECTORY  table. For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Vehicle is equipped with left and right upstream O2 sensor.
  1. Start engine. Allow engine to reach normal operating temperature. Using scan tool, set engine speed to 1500 RPM. Using scan tool, read right upstream O2 sensor state. If right upstream O2 sensor state is switching, go to next step. If right upstream O2 sensor state is not switching, go to step 5).
  2. While monitoring scan tool display, wiggle right upstream O2 sensor wiring harness. If right upstream O2 sensor state locked at center at any time, repair wiring harness as necessary where wiggling caused problem to appear. Perform TEST VER-5A . If right upstream O2 sensor state did not lock at center at any time, go to next step.
  3. Condition to set trouble code is not present at this time. RIGHT UPSTREAM O2 SENSOR STAYS AT CENTER DTC sets if right upstream O2 sensor signal voltage stays .39-.52 volt during the trip. PCM pulls sensor voltage to 5 volts for 30 seconds and monitors sensor voltage. If voltage stays at 5 volts, this DTC will set indicating no activity. Possible causes are: O2 sensor output wire open, O2 sensor ground circuit open, O2 sensor failure or Powertrain Control Module (PCM) failure. Go to next step.
  4. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-5A . If related wiring and connectors were repaired, perform TEST VER-5A .
  5. Turn ignition off. Disconnect right upstream O2 sensor connector. Using scan tool in ohmmeter mode, check resistance of right upstream O2 sensor connector (harness side) sensor ground circuit. See RIGHT UPSTREAM O2 SENSOR CONNECTOR WIRE ID (HARNESS SIDE)  table. If resistance is 5 ohms or less, go to next step. If resistance more than 5 ohms, repair open to sensor ground circuit. Perform TEST VER-5A .
  6. Connect a jumper wire between right upstream O2 sensor connector (harness side) between signal circuit and battery positive terminal. Using scan tool, read right upstream O2 sensor voltage. If voltage is one volt or less, go to next step. If voltage is more than one volt, replace right upstream O2 sensor. Perform TEST VER-5A .
  7. Disconnect jumper wire. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of right upstream O2 sensor signal circuit between right upstream O2 sensor connector (harness side) and PCM connector. See RIGHT UPSTREAM O2 SENSOR CONNECTOR WIRE ID (HARNESS SIDE)  and PCM TERMINAL 30 CONNECTOR WIRE IDENTIFICATION  tables. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-5A . If resistance is 5 ohms or more, repair open right upstream O2 sensor signal circuit. Perform TEST VER-5A .
RIGHT UPSTREAM O2 SENSOR CONNECTOR WIRE ID (HARNESS SIDE)

Application Wire Color
O2 Sensor Signal Circuit Tan/White
O2 Sensor ASD Relay Output Circuit Dark Green/Orange
O2 Sensor Heater Ground Circuit Black
O2 Sensor Ground Circuit Black/Light Blue
PCM TERMINAL 30 CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 30 (Right Upstream O2 Sensor Signal Circuit) Tan/White
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