Diagnosis and checking procedure using instruments
USING A CIRCUIT TESTER
J3-1012
Voltage check (range set to DC V)
Connect the positive probe to the terminal to be tested, and
the negative probe to body ground (or the ground terminal of
the ECM)
J3-830
Checking the connection (range set toΩ)
Measure the resistance and check for open or shorted wire in
the harness or the connector.
NOTE:
This check must be carried out with both connectors discon-
nected.
(This avoids by-passing the connection through other circuits).
1) Check for open circuit (range:Ωx 1K)
Measure the resistance between the respective pins in both
connectors.
Specified resistance:
1MΩ, or more (No continuity) Open circuit
10Ω, or less (Continuity) O.K.
2) Check for correct insulation value (range:Ωx 1K)
Measure the resistance between the pins in both connectors,
as well as between the suspected pin and the body (body
short).
Specified resistance:
1MΩ, or more (No continuity) O.K.
10Ω, or less (Continuity) Short circuit
Resistance measurement (range set toΩ)
Measuring the internal resistance of sensors, solenoid valves
etc. to check the operating condition of components.
NOTE:
Select the appropriate range for measuring the internal
resistance, or the measurement will result in an incorrect read-
ing.
Before changing the measurement range the gauge must be
reset to zero.
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