The Crankshaft position Sensor (CPS) is one tiny part, however a faulty one can reason your engine to begin hard, operation rough and even stall if driving. Check out on come learn how to replace it yourself for a fraction of the cost of having it done professionally.

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

The Crankshaft position Sensor (CPS) is a tiny electronic an equipment that provides a magnetic ar to finding the place or rotational rate of the crankshaft. This information is pass on come the engine regulate module for use in ignition system timing and also other crucial engine functions. This is why a CPS failure deserve to prevent the engine indigenous starting, or even cut off the fuel pump and stall the vehicle while driving. If you suspect that her CPS might be failing, you can replace it yourself now and also avoid being stranded on the next of the road later.


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

It is highly said to usage an OEM instead of part, as part aftermarket parts have actually inferior magnets that can compromise the quality and also stability of the signal.

Step 1 – background the front of the auto using ramps

You will require to obtain under the prior of the automobile to remove the CPS, so acquire it lifted using ramps and be certain to use chocks to save it in place.

Figure 1. Obtaining 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 on the passenger"s side because that the 5.2 and 5.9 engines.

Figure 2. CPS sensor ar on a 4.0 engine.

It will certainly be easiest to access the sensor indigenous under the vehicle, in the gap between the firewall and the engine. Figure 3 shows the watch from the bottom.

Figure 3. Sensor ar from under the vehicle.

Step 3 – Unplug the cable connector

After locating the sensor, trace the wire up to the optimal of the engine, i m sorry is located simply behind the oil filter as displayed in figure 4. Disconnect the from the main wire harness so that it is prepared for removal.

Figure 4. Unplug wire connector.
Pro Tip

Tie part thin string to the finish of the sensor wire connector, so that you can easily fish the connector for the new sensor back up v the engine after replacement.

Step 4 – remove the infection shifter cable bracket

In order to remove the sensor, friend will first need to do room by removing the transmission shifter cable bracket. Once looking up toward the sensor from underneath the vehicle (as displayed in number 4), friend will check out the shifter cable and bracket blocking the accessibility needed to remove its mounting bolt.

You will need to remove the two bolts indicated by the arrows in figure 5. One will need a 3/8" socket and 11/16" because that the other. Friend will likewise need come undo the spring and the arm link as presented in number 6 to make adequate room to get to the sensor.

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

Step 5 – remove defective sensor

With the infection cable bracket out of the way, use a 12" socket expansion to remove the 11mm bolt stop the CPS in place. As soon as the bolt is removed, slide the sensor out of the bell housing (see figure 7) and remove it slowly, permitting the cable to make its way gently the end of the engine compartment. Pull the string you attached earlier all the means through as you will require it in the next step.

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

Be very cautious at this point; with the sensor removed, there is a hole in the bell housing. Any nuts, bolts or debris that falls in could result in a much much more expensive repair.

Step 6 – download the brand-new CPS

The string the you pulled v in the vault step deserve to now be tied to the finish of the wire connector the the brand-new sensor. Pull the other end of the string gradually to fish the new wire up into the correct position for reconnecting it come the key wire harness.

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

Figure 8. Slide new sensor right into position.
Pro Tip

The OEM replacement for the sensor should come with a paper cover on the end. Carry out not remove this due to the fact that it serves together a spacer to administer the correct space for the device to role properly. The record will be sheared off as soon as the engine starts.

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Step 7 – start your engine!

Your new sensor is in place and also should be sending out the proper signals to the engine control module. Verify that your vehicle starts and drives properly. If you proceed to experience CPS associated issues, double check the connection to the main wire harness.