MR2 L4-132 2164cc 2.2L DOHC (5S-FE) (1993)
testing electronic components.
Proper Tools and Testing Procedures
DIGITAL VOLT/OHM METER
Use a digital volt/ohm meter (DVOM) with a minimum 10 mega-ohms internal impedance when testing an ECU or related components, unless use
of an analog meter is specified by a testing procedure. Analog meters have low internal impedance and cause circuit "loading" in low voltage
circuits, resulting in inaccurate measurements and possible damage to components. Use of a DVOM is necessary to obtain accurate measurements
and avoid damaging low voltage ECU circuits and components.
TESTING PROCEDURES
Always follow recommended testing procedures. Never ground or apply voltage to a circuit unless specified by a testing procedure. ECU's provide
a regulated constant low voltage source to some circuits, which may require a minimum resistance (impedance) to operate. Directly grounding or
applying battery power to these circuits could damage the ECU and cause a system failure.
Finding Short Circuits
Meter Types
1.
Use a digital or analog multimeter with a minimum 10k ohm resistance.
2.
Remove the blown fuse and disconnect all loads for that circuit.