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MAP
Testing
 Complete
ECU reference voltage test at MAP
With
the MAP connected "in-circuit"
Connect
a voltmeter as follows, key on (KOEO)
Red
lead to terminal "B", black lead to ground
Measure
the Voltage values and compare to chart
These
voltages will vary according the current weather conditions at your
location
IAT
and ECT Testing
Remove
wiring harness from sensor/s
Install
"test harness" to IAT or ECT sensor
Measure
the resistance values in Ohms and compare to chart below
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IAT
and ECT Testing 2
Remove
wiring harness from sensor/s
Turn
Key On (KOEO)
Measure
voltage between terminals "A" & "B" of the wiring harness going
to the IAT or ECT
Black
Voltmeter lead to "B", red lead to "A"
Voltage
should be 5 vDC +/- 10% (KOEO)
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Governor
Actuator Testing
Disconnect
wire/s to Governor Actuator
Measure
the resistance of the actuator
3.0-4.5
Ohms is specification
Turn
Key on and measure voltage on the harness
Volt
meter red lead to terminal "A", black lead to terminal "B", turn
key on (KOEO)
Voltage
is Pulse Width Modulated and could vary between 2.3V and 6.2V
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Fuel
Injector Testing
Disconnect
wire/s to fuel injector
Measure
the resistance of the fuel injector
1.2
- 1.6 Ohms is specification
Turn
Key on and measure voltage on the harness
Volt
meter red lead to terminal "A", black lead to terminal "B", turn
key on (KOEO)
Voltage
is pulsing but can be seen. Noid light is best for this test.
Complete
fuel injector "tap test"
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EGO
Testing
Complete
EGO Bias voltage test
With
the EGO connected "in-circuit"
Connect
a voltmeter as follows, key on (KOEO)
Red
lead to Cavity "B", black lead to Cavity "A".
Complete
EGO test in machine per EGO testing sequence
'Richen
Mixture' EGO voltage 0.8 vDC or higher
'Lean
Mixture' EGO voltage 0.3 vDC or lower
A=
ground B= Sense C= system ground D= 12V IGN (heat)
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No
Start: No Fuel, w/spark Quick Tests (Tap Test)
If the fuel pump runs or the lock off 'clicks'; operate the
fuel injector manually as follows:
Cycle
"key" several times (off-on-off-on-off)
Disconnect
wiring harness to the fuel injector
Connect
a voltmeter as follows, key on (KOEO)
Connect
a test light to ground
Tap
the other terminal of the injector with the test light probe.
When
"tapped", the test light should light and the injector should spray
fuel
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EGO
Bias Voltage Test (KOEO, Black Connector Pin 10)
(if
equipped)oMeasure "Bias" voltage to EGO Sensor
Turn
Key Off
Leave
harness installed to EGO
Start
Engine
Voltmeter
red lead to Cavity "B" on EGO Sensor Connector, black lead to Cavity
"A"
Results
should be 0.1 - 0.9 vDC when sensor is activated and engine running
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