Test NTC-11A: Checking Oxygen Sensor Heater
NOTE:
Perform TEST NTC-1A: NO TROUBLE CODES (NTC) TESTS before proceeding.
- For O2 sensor/model identification see O2 SENSOR IDENTIFICATION table. Turn ignition on. Using scan tool, actuate O2S heater test. Wait 2 minutes for O2S signal voltages to stabilize. Using scan tool, read O2S signal voltages. If any O2S signal voltages are more than one volt, go to next step. If any O2S voltages are one volt or less, go to step 4.O2 SENSOR IDENTIFICATION
Application Location O2S 1/1 Right Bank Upstream O2S O2S 1/2 Right Bank Downstream O2S O2S 2/1 Left Bank Upstream O2S O2S 2/2 Left Bank Downstream O2S - When any O2S signal voltage stays more than one volt indicates a problem with an O2S circuit. Ensure scan tool is still actuating O2S heater test. Disconnect suspect O2S connector. Using a voltmeter, check voltage of ASD relay output circuit at O2S connector (harness side). See O2S CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay circuit at suspect O2S connector (harness side). Perform TEST VER-2A: ROAD TEST VERIFICATION .
- Using scan tool, stop O2S heater test. Using an ohmmeter, check resistance of heater ground circuit at O2S connector (harness side). See O2S CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE) table. If an open circuit is present, repair open heater ground circuit at suspect O2S connector (harness side). If an open circuit does not exist, replace suspect O2S. Perform TEST VER-2A: ROAD TEST VERIFICATION .O2S CONNECTOR WIRE IDENTIFICATION (HARNESS SIDE)
Application Wire Color O2S ASD Relay Output Circuit Orange/Dark Green O2S Heater Ground Circuit Black - If directed to this test procedure from any of the following tests, perform indicated test procedure. See TEST REFERENCE table. If not directed to this test procedure from any of the following tests, using scan tool, stop actuation test. Test is complete.
TEST REFERENCE
| If Coming From Test | Perform Test |
|---|---|
| DTC P0132-B | DTC P0132-C |
| DTC P0135-A | DTC P0135-B |
| DTC P0138-B | DTC P0138-C |
| DTC P0141-A | DTC P0141-B |
| DTC P0152-B | DTC P0152-C |
| DTC P0155-A | DTC P0155-B |
| DTC P0158-B | DTC P0158-C |
| DTC P0161-A | DTC P0161-B |
| DTC P0172-A | Return To DTC P0172-A |
| DTC P0175-A | Return To DTC P0175-A |