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How to replace the PCM (Engine Computer) of a 1995 Jeep Grand Cherokee 5.2L

ECM Diagram for 1995 Jeep Grand Cherokee

How to replace the PCM (Engine Computer) of a 1995 Jeep Grand Cherokee 5.2L

The 1995 Jeep Grand Cherokee 5.2L Powertrain Control Module – PCM – is positioned in the engine compartment. PCM is also known as SBEC ( Single Board Engine Controller )  or an Engine Computer. It’s a pre-programmed digital computer that operates the fuel system, emission control devices, regulates the ignition timing, charging system, speed monitoring system, air-fuel ratio, air conditioning compressor, as well as the idle speed.

The programming settings of PCM can be changed depending on operating conditions of the vehicle: the PCM accepts input signals from various sensors and regulates the vehicle’s operations through various system components (PCM Outputs), based on the collected data.

After that information is received from the sensors, the PCM will set all the listed parameters accordingly:

  • ignition timing
  • manifold absolute pressure
  • throttle position
  • engine RPM
  • engine coolant temperature
  • AT transmission gear position
  • generator charge rate
  • speed
  • brake switch
  • air conditioning clutch switch
PCM Inputs PCM Outputs
A/C select (if equipped with factory A/C) A/C clutch relay

 

Auto shutdown (ASD) sense Auto shutdown (ASD) relay

 

Battery voltage

 

EGR valve control solenoid

 

Brake switch

 

EVAP canister purge solenoid

 

Camshaft position sensor signal

 

Fuel injectors
Crankshaft position sensor Fuel pump relay

 

Engine coolant temperature sensor

 

Generator field
Generator output

 

Idle air control (IAC) motor

 

Ignition circuit sense

 

Ignition coil

 

Intake manifold air temperature sensor

 

Check Engine lamp

 

Manifold absolute pressure (MAP) sensor

 

SCI transmit (DRB connection)

 

Overdrive/override switch

 

Speed control vacuum solenoid

 

Oxygen sensor

 

Speed control vent solenoid

 

Park/neutral switch (AT)

 

Tachometer
Power ground

 

SCI receive (DRB scan tool connection)

 

Sensor return

 

Signal ground

 

Speed control on/off switch

 

Speed control resume switch

 

Speed control set switch

 

Throttle position sensor

 

Vehicle speed sensor

The PCM has a voltage converter inside that regenerates battery voltage to a 5.0 Volt standard. That’s being used to power the crankshaft/camshaft position sensors, speed sensor, MAP sensor (Manifold Absolute Pressure Sensor) and TPS sensor (Throttle Position Sensor).

How To Remove the Powertrain Control Module (PCM) on 1995 Jeep Grand Cherokee 5.2L

The PCM is placed on the cowl panel on the right side of the engine compartment.

1995 Jeep Grand Cherokee 5.2 PCM.
1995 Jeep Grand Cherokee 5.2 PCM.

Replacement

  1. Disconnect the negative battery cable.
  2. Remove the coolant reserve/overflow tank (mounted on 1
    bolt and 2 nuts).
  3. Delicately unplug the three 32–way connectors
    at PCM.
  4. Remove the mounting bolts (3).
  5. Pull the PCM out.

Installation

  1. Examine all the pins in the three 32–way electrical connectors for damage. Make sure that they are all ok.
  2. Install PCM. Tighten the mounting bolts to 1 N·m (9 in. lbs.) torque (3 bolts).
  3. Mount coolant reserve/overflow tank.
  4. Connect the negative cable back to the battery.

The Part Number 56026974. Order Here.

Part number (56026974)
*You can order the 1995 Jeep Grand Cherokee 5.2L PCM at our fs1inc store. We provide the best quality service at the lowest price possible. All our units come flashed and programmed, with Free Shipping and Lifetime Warranty.

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