Sidekick 4WD L4-1590cc 1.6L SOHC 0 TBI 8V (1990)
(ECM), should be tested only with a 10-megaohm or higher impedance digital multimeter.
When measuring resistance with a digital multimeter, the vehicle Battery should be disconnected. This will prevent incorrect readings. Digital
meters apply such a small voltage to measure resistance that the presence of voltages can upset a resistance reading. Diodes and solid state
components in a circuit can cause an ohmmeter to give a false reading. To find out if a component is affecting a measurement, take a reading once,
reverse the leads and take a second reading. If the readings differ, the solid state component is affecting the measurement.
FUSED JUMPER WIRE
A fused jumper is available with small clamp connectors providing adaptation to most connectors without damage. This fused jumper wire is
supplied with a 20 amp fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the
circuit being tested.
CAUTION: A fused jumper may not protect solid state components from being damaged.
SHORT FINDER
Short Finders are available to locate hidden shorts to ground. The short finder creates a pulsing magnetic field in the shorted circuit and shows you
the location of the short through body trim or sheet metal.
FUSE TESTER
A simple tester can detect a blown fuse. To check a fuse, the tester is applied directly to the fuse in the Fuse Block. Two probes contact the fuse,
either into the slots of a flat fuse or to the metal ends of a glass fuse. With power on, a red LED in the tester lights if the fuse is open. The handle
of the tester is a tool for removing either type of fuse.
Battery Precautions
CAUTION:
-
Never use a booster/starter which has a voltage rating above 12 volts to start engine.
-
Always ensure the battery is properly connected to the vehicle prior to attempting to start engine.
-
Don't disconnect the battery when the engine is running.
-
When charging a battery, be sure battery cables are disconnected.
-
The battery contains acid and produces explosive gas (hydrogen). Avoid creating sparks near battery.
Electrical Connections and Circuits
1.
Fully release connector locks prior to disconnecting. Ensure connectors are fully seated and all insulators and shields are in place when
reinstalling.
2.
Never connect or disconnect electrical connections with the ignition switch in the "ON" position unless specifically directed to do so in a test
procedure.
3.
Do not use a self powered test lamp to check continuity.
4.
Do not create any arcing to check the continuity of a circuit.
Electronic Component Handling
STATIC DISCHARGE
^
Discharge any static electrical charges before handling electronic parts by touching ground or maintaining a ground connection to a bare skin area
like the wrist.
^
Never touch the PCM connector pins, integrated circuit connector pins, or soldered components on the PCM circuit board.
TESTING
^
When measuring voltage at the control unit harness connector, disconnect harness connector with the ignition OFF, then turn ignition "ON" as
necessary.
^
To prevent deforming control unit harness connectors, do not probe terminals directly. Instead, insert a pin from the harness side and perform
measurements through pin.
CONTROL UNIT DAMAGE
^
Do not try to disassemble the control unit.
^
Before performing electrical welding (for instance, spot welding), disconnect the battery, climate control, injection, cruise control, PCM and radio.
^
If temperatures may exceed 176°F (80°C), (example: infra-red spray booth), remove all ECUs.
^
Avoid getting water on any of the Fuel and Engine Control System Components.
^
Never apply battery power to a component unless directed to do so in a test procedure.
Electronic Component Replacement
1.
Before servicing electronic components, disconnect the battery ground.
NOTE: Before removing battery ground, access trouble codes. PCM memory will be erased if ground cable is removed.
