LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Isuzu >> 1995 >> Rodeo LS, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 3.2L >> Engine Sensors & Switches >> Oxygen Sensor (O2S)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Oxygen Sensor (O2S)

NOTE: Malfunctioning O2S may set Code 13, 44 or 45. For additional testing, see TESTS W/CODES - 3.2L article.
CAUTION: DO NOT attempt to measure oxygen sensor output voltage using a conventional voltmeter. Current drain of voltmeter could damage sensor. Oxygen sensor voltage signal can be measured using a 10-megohm (minimum input impedance) digital voltmeter. For further information, see appropriate TESTS W/CODES - 3.2L article.
  1. Start engine, and warm it to operating temperature. Ensure vehicle is operating in closed loop. Unplug oxygen sensor connector at sensor. Using Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, connect DVOM (on voltmeter scale) between ground and oxygen sensor connector (sensor side).
  2. Place a short jumper wire in sensor lead (computer side). While holding jumper wire in one hand, alternately touch negative battery terminal and then positive battery terminal with other hand. DO NOT touch sensor lead directly to battery.
  3. Monitor DVOM reading. When negative battery terminal is touched, oxygen sensor output voltage should increase (up to one volt). When positive battery terminal is touched, oxygen sensor output voltage should drop (as low as .1 volt). If oxygen sensor does not respond as indicated, replace sensor. To test oxygen sensor heater, go to CHART C-1F  under DIAGNOSTIC CHARTS.

For park/neutral switch testing procedure, proceed to appropriate CHART C-1A  under DIAGNOSTIC CHARTS. Relay is mounted on left side of auto transmission. S witch is also called automatic transmission mode switch.

scientia non olet · About LEMON Manuals