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Grand Cherokee WJ oxygen sensor
An O2 sensor is a galvanic battery that provides the PCM v a voltage signal (0-1 volt) inversely proportional to the amount of oxygen in the exhaust. In various other words, if the oxygen contents is low, the voltage output is high; if the oxygen content is high the calculation voltage is low. The PCM provides this info to adjust injector pulse-width to attain the 14.7–to–1 air/fuel ratio essential for appropriate engine operation and to control emissions.
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The O2 sensor must have actually a source of oxygen from external of the exhaust stream because that comparison. Present O2 sensors get their new oxygen (outside air) supply with the O2 sensor case housing.
Four wires (circuits) are used on every O2 sensor:12–volt feeding circuit for the sensor heater elementGround circuit because that the heater elementLow-noise sensor return circuit to the PCMInput circuit indigenous the sensor ago to the PCM come detect sensor operation
Grand Cherokee oxygen sensor locations for 4.0 and also 4.7 engines
The Oxygen Sensors (O2S) room attached to, and also protrude right into the auto exhaust system. Depending upon the emissions package, the vehicle may use a total of either 2 or 4 sensors.
Federal Emissions parcel (4.0L and 4.7L engines):
Two sensors space used: upstream (referred to together 1/1) and also downstream (referred to as 1/2). With this emissions package, the upstream sensor (1/1) is located just before the main catalytic convertor. The downstream sensor (1/2) is located just after the key catalytic convertor.
California Emissions package (4.0L engine):
On this emissions package, 4 sensors space used: 2 upstream (referred to as 1/1 and 2/1) and also 2 downstream (referred to together 1/2 and 2/2). With this emissions package, the rear/upper upstream sensor (2/1) is located in the exhaust downpipe just prior to the behind mini-catalytic convertor. The front/upper upstream sensor (1/1) is located in the exhaust downpipe just before the former mini-catalytic convertor. The rear/lower downstream sensor (2/2) is located in the exhaust downpipe simply after the behind mini-catalytic convertor, and before the main catalytic convertor. The front/lower downstream sensor (1/2) is situated in the exhaust downpipe simply after the front mini-catalytic convertor, and before the main catalytic convertor.
California Emissions parcel (4.7L engine):
On this emissions package, 4 sensors space used: 2 upstream (referred to as 1/1 and also 2/1) and 2 downstream (referred to as 1/2 and also 2/2). V this emissions package, the appropriate upstream sensor (2/1) is situated in the ideal exhaust downpipe just prior to the mini-catalytic convertor. The left upstream sensor (1/1) is situated in the left exhaust downpipe just prior to the mini-catalytic convertor. The appropriate downstream sensor (2/2) is located in the right exhaust downpipe just after the mini-catalytic convertor, and before the key catalytic convertor. The left downstream sensor (1/2) is located in the left exhaust downpipe simply after the mini-catalytic convertor, and also before the key catalytic convertor
02S Sensor removal
Never apply any form of grease to the oxygen sensor electric connector, or attempt any kind of soldering that the sensor wiring harness.
WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES and also CATALYTIC CONVERTER(S) BECOME very HOT throughout ENGINE OPERATION. Permit ENGINE to COOL before REMOVING OXYGEN SENSOR.
1. Raise and also support vehicle.
2. Disconnect O2S pigtail exploit from main wiring harness.
3. If equipped, disconnect sensor wire harness mounting clips from engine or body.
CAUTION: once disconnecting sensor electric connector, execute not pull straight on cable going right into sensor.
4. Eliminate O2S sensor through an oxygen sensor removal and installation tool.
02S Sensor installation
Threads of brand-new oxygen sensors are factory coated v anti-seize link to aid in removal. Carry out NOT include any added anti-seize link to subject of a new oxygen sensor.
1. Download O2S sensor. Tighten to 22 ft. Lbs. (30 N·m) torque.
2. Connect O2S sensor cable connector to main wiring harness.
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3. If equipped, affix sensor cable harness mounting clips come engine or body. Once Equipped: The O2S pigtail harness should be clipped and/or bolted earlier to their original positions top top engine or body to stop mechanical damages to wiring.
Grand Cherokee WJ oxygen sensors
(Part Numbers: Black text = commonwealth emissions, black color + red text = California emissions)
|Engine||Before catalyst||After catalyst|
|4.0L||56041676AA(w/10.5″ pigtail)56041212AE(w/18″ pigtail)||56041344AD(w/14″ pigtail)56041212AF(w/12″ pigtail)|
|4.7L||56028233AA(w/12″ pigtail)56028232AA(w/18″ pigtail)||56041345AD(w/14″ pigtail)56028235AA(w/12″ pigtail)|