Jeep 4.0L Index of Articles

A bad fuel pump, that has stopped sending fuel to the fuel injectors, will cause a ‘cranks but does not start condition’ on your 4.0L equipped Jeep. A fuel... [read more]

Testing a trouble code P0141: 1/2 O2 Sensor Heater Failure is not that hard and in this tutorial I'm gonna' show you how to do it in 3 simple tests. You don't need any... [read more]

APPLIES TO: This Auto Shut Down (ASD) relay circuit wiring diagram applies to the following vehicles: 1993, 1994, 1995 4.0L Jeep Grand Cherokee. ASD relay... [read more]

A trouble code P0141: 1/2 O2 Sensor Heater Failure signals a problem with the internal heater of the downstream oxygen sensor. Thankfully, testing it isn't difficult at... [read more]

APPLIES TO: This fuel pump relay circuit wiring diagram applies to the following vehicles: 1993, 1994, 1995 4.0L Jeep Grand Cherokee. Fuel pump troubleshooting... [read more]

The throttle position sensor (TPS) on your 1993-1995 Jeep Grand Cherokee can be accurately tested with a simple multimeter to find out if it's bad (or not). Also, you... [read more]

APPLIES TO: This fuel pump relay circuit wiring diagram applies to the following vehicles: 1993, 1994, 1995 4.0L Jeep Grand Cherokee. The oxygen sensor heater... [read more]

APPLIES TO: This throttle position sensor (TPS) circuit wiring diagram applies to the following vehicles: 1993, 1994, 1995 4.0L Jeep Grand Cherokee. The TPS... [read more]

APPLIES TO: This engine coolant temperature (ECT) and intake air temperature (IAT) sensor circuit wiring diagram applies to the following vehicles: 1993, 1994, 1995... [read more]

APPLIES TO: This MAP sensor circuit wiring diagram applies to the following vehicles: 1993, 1994, 1995 4.0L Jeep Grand Cherokee. The MAP sensor needs power and... [read more]