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Home >> Jeep >> 2001 >> Wrangler SE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1196: 2/1 O2 Sensor Slow During Catalyst Monitor (4.0L With CALIF. Emissions) >> Testing

DTC P1196: 2/1 O2 Sensor Slow During Catalyst Monitor (4.0L With CALIF. Emissions): Testing

NOTE: 2/1 HO2S is located on rear exhaust manifold. 2/1 HO2S may also be referred to as a upstream oxygen sensor.
  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed for DTC P1196 and displayed count is "0", go to next step. If GOOD TRIP counter for DTC P1196 is not displayed or displayed count is not "0", go to step  14 .
  2. Start engine and allow it to idle. Using scan tool in SENSOR mode, monitor 2/1 HO2S voltage until voltage stabilizes. Using scan tool, actuate HO2S HEATER TEST and monitor 2/1 HO2S voltage for 3 minutes. If voltage changes to less than 1.5 volts, go to next step. If voltage does not change to less than 1.5 volts, go to step  7 .
  3. Ensure engine is still idling. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary. If exhaust system is okay, go to next step.
  4. Ensure engine is still idling. Check exhaust system for excessive smoke caused by internal oil or coolant consumption. Repair engine mechanical condition as necessary and replace 2/1 HO2S. If engine mechanical condition is okay, go to next step.
  5. Turn ignition off. Using a voltmeter, backprobe Black/Light Blue wire between 2/1 HO2S harness connector and terminal A4 at PCM C1 harness connector. See Figure . Start engine and ensure engine is at normal operating temperature. If voltage is less than 0.1 volt, go to next step. If voltage is 0.1 volt or more, repair poor connection causing high resistance on 2/1 HO2S ground circuit (Black/Light Blue wire) between 2/1 HO2S and PCM.
  6. Turn ignition off. Using a voltmeter, backprobe Light Green/Red wire between 2/1 HO2S harness connector and terminal A26 at PCM C1 harness connector. See Figure . Start engine and ensure engine is at normal operating temperature. If voltage is less than 0.1 volt, go to step  13 . If voltage is 0.1 volt or more, repair poor connection causing high resistance on 2/1 HO2S signal circuit (Light Green/Red wire) between 2/1 HO2S and PCM.
  7. Turn ignition off. Disconnect 2/1 HO2S connector. Turn ignition on. Using scan tool, actuate O2 HEATER TEST. Measure voltage between ground and Orange/Dark Green wire at 2/1 HO2S harness connector. If voltage is more than 11 volts, go to next step. If voltage is 11 volts or less, open in power circuit (Orange/Dark Green wire) to 1/1 HO2S heater. See WIRING DIAGRAMS.
  8. Turn ignition off. Disconnect PCM connectors. PCM is located on firewall in right rear corner of engine compartment. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Brown/White wire between 21/1 HO2S harness connector and terminal C16 at PCM C3 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown/White wire.
  9. Ensure ignition is off. Reconnect PCM connectors. Using a voltmeter, backprobe Light Green/Red wire between 2/1 HO2S harness connector and terminal A26 at PCM C1 harness connector. See Figure . Start engine and ensure engine is at normal operating temperature. If voltage is less than 0.1 volt, go to next step. If voltage is 0.1 volt or more, repair poor connection causing high resistance on 2/1 HO2S signal circuit (Light Green/Red wire) between 2/1 HO2S and PCM.
  10. Turn ignition off. Using a voltmeter, backprobe Black/Light Blue wire between 2/1 HO2S harness connector and terminal A4 at PCM C1 harness connector. See Figure . Start engine and ensure engine is at normal operating temperature. If voltage is less than 0.1 volt, go to next step. If voltage is 0.1 volt or more, repair poor connection causing high resistance on 2/1 HO2S ground circuit (Black/Light Blue wire) between 2/1 HO2S and PCM.
  11. Ensure engine is still idling. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary. If exhaust system is okay, go to next step.
  12. Ensure engine is still idling. Check exhaust system for excessive smoke caused by internal oil or coolant consumption. Repair engine mechanical condition as necessary and replace 2/1 HO2S. If engine mechanical condition is okay, go to next step.
  13. At this time, 2/1 HO2S is assumed to be defective. Replace 2/1 HO2S.
  14. Start engine and allow it to idle. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary. If exhaust system is okay, go to next step.
  15. Ensure engine is still idling. Check exhaust system for excessive smoke caused by internal oil or coolant consumption. Repair engine mechanical condition as necessary and replace 2/1 HO2S. If engine mechanical condition is okay, go to next step.
  16. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, reconnect all connectors. Start engine. Wiggle related connectors and wiring harness while monitoring scan tool display. If GOOD TRIP counter display count changes to "0", repair connector or wiring harness where wiggling caused display to change. If GOOD TRIP counter display count does not change to "0", no problem is indicated at this time. Check for any related technical service bulletins that may apply.
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