Introduction

INTRODUCTION
The procedures contained here include all the specifications, instructions and graphics needed to diagnose 1997 and 1998 XJ Jeep Cherokee. These diagnostics are based on the failure condition or symptom being present at the time of diagnosis.


Diagnostic procedures change every year. New diagnostic systems may be added; carryover systems may be enhanced. It is recommended that you review the entire section to become familiar with all new and changed diagnostic procedures. Begin all diagnosis at symptom identification test. This will cover all the necessary requirements to begin a logical diagnostic path for each repair. If there is a trouble code detected, it will direct you to a specific test. If it is a symptom problem, it will direct you to a SYSTEM TEST 1 A for more specific instructions or directly to a specific test. Side headers are used to direct you alphabetically to the specific systems.




DRBIII Safety Information
WARNING: Exceeding the limits of the DRB multimeter is dangerous. It can expose you to serious or possibly fatal injury. Carefully read and understand the cautions and the specification limits.


- Follow the vehicle manufacturer's service specifications at all times.
- Do not use the DRB if it has been damaged.
- Do not use the test leads if the insulation is damaged or it metal is exposed.
- To avoid electrical shock, do not touch the test leads, tips, or the circuit being tested.
- Choose the proper range and function for the measurement. Do not try voltage or current measurements that may exceed the rated capacity.
- Do not exceed the limits shown in the table below:



FUNCTION INPUT LIMIT

Volts

0 - 500 peak volts AC

0 - 500 volts DC

Ohms (resistance)*

0 - 1.12 megohms

Frequency Measured

0 - 10 kHz

Frequency Generated

Temperature

-58-1100°F

-50 - 600°C


* Ohms cannot be measured if voltage is present. Ohms can be measured only in a non-powered circuit.


- Voltage between any terminal and ground must not exceed 500v DC or 5C)0v peak AC.
- Use caution when measuring voltage above 25v DC or 25v AC.
- The circuit being tested must be protected by a 1 0A fuse or circuit breaker.
- Use the low current shunt to measure circuits up to 1 0A. Use the high current clamp to measure circuits exceeding 10A.
- When testing for the presence of voltage or current, make sure the meter is functioning correctly. Take a reading of a known voltage or current before accepting a zero reading.
- When measuring current, connect the meter in series with the load.
- Disconnect the live test lead before disconnecting the common test lead.
- When using the meter function, keep the DRB away from spark plug or coil wires to avoid measuring error from outside interference.

Vehicle Preparation for Testing
Make sure the vehicle being tested has a fully charged battery. If it does not, false diagnostic error messages may occur.