BRP E 250 L HO AG B, Service Manual

Page: 116 / 460

Electrical and Ignition
Sensor and Circuit Tests
116
Sensor and Circuit Tests
All sensor circuits are dependent on wiring and
connections, sensor resistance, and except for the
CPS,
EMM supplied current (5 V). The supplied
current flows through the wiring circuit and sensor
before returning to the
EMM .
Circuit tests check the integrity of the main engine
harness and
EMM circuits using resistance or
diode tests. Continuity tests check the integrity of
ground circuits and/or the 55V circuit. These tests
eliminate the need to disconnect the engine har-
ness from the
EMM , or remove the EMM .
IMPORTANT:
Use Evinrude Diagnostics soft-
ware to monitor sensor circuit voltages or values.
Air Temperature Sensor (AT) Test
Remove the electrical connector from the air tem-
perature sensor.
Use a digital multimeter with appropriate test
probe leads to measure sensor resistance.
Air Temperature Sensor Circuit
Test
Remove the electrical connector from the air tem-
perature sensor.
Use a digital multimeter with appropriate test
probe leads to measure sensor circuit resistance.
Make sure the key switch is in the OFF position.
Connect the positive meter lead to the engine har-
ness connector wire listed in the table. Connect
the negative meter lead to engine ground.
Results:
•
An infinite reading (
∞
) indicates an open circuit.
Isolate the faulty component. Check wiring and
connections. Repair or replace faulty wiring.
NOTICE
Use appropriate test leads or adapters such
as Test Probe Kit, P/N 342677, when perform-
ing electrical tests.
NEVER pierce the insulation of the engine
wiring, or use any piercing-style test probe.
Piercing insulation damages the wire and can
cause other unintended electrical problems.
AT Sensor Resistance
680
Ω
± 5.25% @ 212°F (100°C)
10000
Ω
± 1.5% @ 77°F (25°C)
32654
Ω
± 3.0% @ 32°F (0°C)
1. Engine harness connector (AT sensor) 009362
Air Temperature Sensor
Circuit Resistance
Wire Pin Result
PINK/BLUE A 9700
Ω
± 200
Ω
BLACK/WHITE B < 1
Ω
1