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service manual. Following these procedures is very 4.2.2 VEHICLE PREPARATION FOR Make sure the vehicle being tested has a fully charged battery. If it does not, false diagnostic codes 4.2.3 SERVICING SUB-ASSEMBLIES Some components of the powertrain system are intended to be serviced as an assembly only. At- 4.2.4 DRBIII T SAFETY INFORMATION WARNING: EXCEEDING THE LIMITS OF THE T MULTIMETER IS DANGEROUS. IT CAN EXPOSE YOU TO SERIOUS OR POSSIBLE FATAL INJURY. CAREFULLY READ AND UNDERSTAND THE CAUTIONS Follow the vehicle manufacturer’s service specifi- cations at all times. – Do not use the DRBIII t if it has been dam- aged. – Do not use the test leads if the insulation is damaged or if metal is exposed. – To avoid electrical shock, do not touch the test leads, tip or the circuit being tested. – Choose the proper range and function for the measurement. Do not try voltage or current – Do not exceed the limits shown in the table below: FUNCTION INPUT LIMIT Volts 0–500 peak volts AC Ohms (Resistance)* 0–1.12 megaohms Frequency Measure 0–10 kHz Temperature –58 – +1100°F * Ohms cannot be measured if voltage is present. Ohms can be measured only on a non-powered – Voltage between any terminal and ground must not exceed 500v DC or 500v peak AC. – Use caution when measuring voltage above 25v DC or 25v AC. – The circuit being tested must be protected by a 10 amp fuse or circuit breaker. – Use the low current shunt to measure circuits up to 10 amps. Use the high current shunt to – When testing for the presence of voltage or current, make sure the meter is functioning – When measuring current, connect the meter in series with the load. – Disconnect the live test lead before disconnect- ing the common test lead. 4.3 WARNINGS AND CAUTIONS 4.3.1 ROAD TEST WARNINGS Some complaints will require a test drive as part of the repair verification procedure. The purpose of CAUTION: Before road testing a vehicle, be T from the rear view mirror. Do not attempt to T while driving. Have an assistant available to operate the DRBIII T . 4.3.2 VEHICLE DAMAGE CAUTIONS Before disconnecting any control module, make sure the ignition is off. Failure to do so could Be careful when performing electrical test so as to prevent accidental shorting of terminals. Such a 5.0 REQUIRED TOOLS AND DRBIII t (diagnostic read-out box) scan tool vacuum gauge 9 GENERAL INFORMATION |