Jeep 4.0L Index of Articles

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 expensive diagnostic equipment for the tests. All you'll need is a simple...   read more >>

NOTE: The above auto shut down (ASD) relay wiring diagram applies only to 1993, 1994, 1995 4.0L Jeep Grand Cherokee. ASD relay troubleshooting notes: The auto shut down (ASD) relay gets power from fuse #6 (15 Amp) and fuse #15 (30 Amp) of...   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 all. In this tutorial, I'll show you the 3 multimeter tests you'll need to...   read more >>

NOTE: The above fuel pump and fuel pump relay wiring diagram applies only to 1993, 1994, 1995 4.0L Jeep Grand Cherokee. Fuel pump troubleshooting notes: The fuel pump relay gets power from fuse #6 (15 Amp) of the Power Distribution Center...   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 don't have to remove it to test it and no scan tool is required for the test....   read more >>

NOTE: The above oxygen (O2) sensor wiring diagram applies only to 1993, 1994, 1995 4.0L Jeep Grand Cherokee. The oxygen sensor heater element gets battery power from the fuel pump relay (in the power distribution...   read more >>

NOTE: The above TPS wiring diagram applies only to 1993, 1994, 1995 4.0L Jeep Grand Cherokee. The TPS needs power and ground to create a throttle angle voltage signal. This power is in the form of 5 Volts DC and is supplied by the powertrain...   read more >>

NOTE: The above intake air temperature (IAT) and engine coolant temperature (ECT) sensor wiring diagram applies only to 1993, 1994, 1995 4.0L Jeep Grand Cherokee. {mobile} (adsbygoogle = window.adsbygoogle ||...   read more >>

NOTE: The above MAP sensor wiring diagram applies only to 1993, 1994, 1995 4.0L Jeep Grand Cherokee. The MAP sensor needs power and ground to create a MAP signal. The PCM is the one that provides power in the form of 5 Volts DC on the VIO/WHT...   read more >>