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FREQUENTLY ASKED QUESTIONS

DTC's
Body DTC's ....Read More

Recommended maint.
Liberty KJ ....Read More

Recommended maint.
Grand Cherokee WJ ....Read More

Recommended maint.
Wrangler TJ ....Read More

Diagnostic Trouble Codes

1999 Grand Cherokee 4.0

WIRELESS CONTROL MODULE
CAUSES ....Read More

TRANSMISSION MODULE
CAUSES ....Read More

TRANSFER CASE MODULE
CAUSES ....Read More

HEATING AND AIR CONDITIONING
CAUSES ....Read More

BRAKE CONTROL MODULE
CAUSES ....Read More

FRONT CONTROL MODULE
CAUSES ....Read More

POWERTRAIN CONTROL MODULE
causes ....Read More

P-CODES
DTC's and common failures ....Read More

DTC's and common causes
P-CODES ....Read More

Checking fuel pressure

Bulb socket

A Relay

Starter

Ignition spark

Blower motor
replace ....Read More

Blower Motor Resistor Module
Replace ....Read More

Tail light bulb
replace ....Read More

Head Light Bulb
Replace ....Read More

Fuel pump
replace ....Read More

replacing the 4X4 switch
Transfer case ....Read More

Replace the ignition coil

testing the starter
Starter ....Read More

Testing a Bulb Socket

Relay and socket diagnosis

Ignition spark
Ignition ....Read More

Testing fuel pressure

Cold air on passenger side
Heating ....Read More

Blows warm air
A/C and Heater ....Read More

Transmission service

Changing transfer case fluid
Transfer case ....Read More

Changing the spark plugs
Spark plugs ....Read More

Changing differential fluid

Maintenance Schedule
Grand Cherokee WJ ....Read More

Maintenance Schedule
Wrangler TJ ....Read More

Checking your coolant system
Coolant ....Read More

Maintenance Schedule
Liberty KJ ....Read More

Rotating your tires

Tire discription

Cleaning the throttle body
Throttle body ....Read More

Cleaning the battery terminals and cables
Battery ....Read More