The Crankshaft place Sensor (CPS) is one small part, however a faulty one can cause your engine to start hard, operation rough and even stall while driving. Read on come learn how to change it you yourself for a fraction of the price of having actually it done professionally.

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This article applies to the Jeep grand Cherokee ZJ (1993-1998).

The Crankshaft position Sensor (CPS) is a tiny electronic device that uses a magnetic ar to finding the place or rotational rate of the crankshaft. This info is pass on to the engine control module for use in ignition system timing and other essential engine functions. This is why a CPS failure have the right to prevent the engine native starting, or even reduced off the fuel pump and stall the auto while driving. If you suspect that her CPS may be failing, you can replace it you yourself now and avoid being stranded top top the next of the roadway later.

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Materials NeededRamps and also chocksJack and jack stand (alternative)3/8" ratchet11mm or 7/16" socket3/8" socket10-12" extensionSwivelScrewdriverPliersReplacement CPS sensorString

It is highly suggested to use an OEM replacement part, as some aftermarket parts have actually inferior magnets that deserve to compromise the quality and stability the the signal.

Step 1 – lift the prior of the car using ramps

You will require to obtain under the prior of the vehicle to remove the CPS, so acquire it lifted utilizing ramps and also be certain to usage chocks to save it in place.

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Figure 1. Gaining the Jeep up on the ramps.

Step 2 – situate the CPS

The CPS is located on the driver"s side of the bell real estate for 4.0 engines, and also on the passenger"s side because that the 5.2 and also 5.9 engines.

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Figure 2. CPS sensor ar on a 4.0 engine.

It will certainly be most basic to accessibility the sensor indigenous under the vehicle, in the gap in between the firewall and also the engine. Figure 3 reflects the check out from the bottom.

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Figure 3. Sensor location from under the vehicle.

Step 3 – Unplug the cable connector

After locating the sensor, trace the wire approximately the height of the engine, i beg your pardon is located just behind the oil filter as presented in figure 4. Disconnect it from the key wire exploit so the it is prepared for removal.

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Figure 4. Unplug cable connector.
Pro Tip

Tie some thin string to the end of the sensor cable connector, so the you can quickly fish the connector for the new sensor ago up v the engine after replacement.


Step 4 – eliminate the transmission shifter cable bracket

In stimulate to remove the sensor, friend will very first need to make room by remove the transmission shifter cable bracket. As soon as looking up toward the sensor from underneath the vehicle (as displayed in number 4), you will watch the shifter cable and bracket blocking the access needed to remove its mounting bolt.

You will must remove the 2 bolts shown by the arrows in number 5. One will call for a 3/8" socket and also 11/16" for the other. Girlfriend will additionally need to undo the spring and the arm linkage as shown in number 6 come make sufficient room to obtain to the sensor.

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Figure 5. Eliminate the infection cable bracket.
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Figure 6. Undo arm linkage and spring.

Step 5 – eliminate defective sensor

With the infection cable bracket out of the way, usage a 12" socket extension to remove the 11mm bolt hold the CPS in place. When the bolt is removed, on slide the sensor the end of the bell real estate (see number 7) and also remove the slowly, permitting the cable to do its means gently the end of the engine compartment. Traction the string girlfriend attached previously all the means through as you will need it in the next step.

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Figure 7. On slide the sensor out of the bell housing.
Pro Tip

Be an extremely cautious in ~ this point; with the sensor removed, over there is a hole in the bell housing. Any kind of nuts, bolts or debris that falls in could result in a much an ext expensive repair.


Step 6 – install the brand-new CPS

The string the you pulled with in the previous step have the right to now it is in tied come the end of the wire connector that the brand-new sensor. Traction the other finish of the string gradually to fish the brand-new wire up right into the correct place for reconnecting it come the key wire harness.

Slide the brand-new sensor right into position and secure it with the 11mm bolt (see figure 8). Reconnect the cable to the main harness by plugging in the connector

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Figure 8. Slide new sensor into position.
Pro Tip

The OEM replacement for the sensor must come through a record cover ~ above the end. Perform not eliminate this due to the fact that it serves together a spacer to administer the correct gap for the machine to role properly. The paper will be sheared off when the engine starts.

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Step 7 – begin your engine!

Your new sensor is in place and also should be sending out the appropriate signals to the engine manage module. Verify the your automobile starts and also drives properly. If you continue to experience CPS related issues, dual check the link to the key wire harness.