90-824052R3 JUNE 2002 FUEL SYSTEMS - 3C-35
NOTE: Temperature/resistance reading may differ
slightly from graph curve.
SENSOR RESISTANCE VS. AIR TEMPERATURE
AIR TEMP. SENSOR RESISTANCE (K OHMS)
Results: Resistance does not change inversely with
temperature change. Replace defective Air
Temperature Sensor.
Resistance changes inversely with temperature
change. Air Temperature Sensor OK.
Engine Head Temperature Sensor
Test
Purpose: This test eliminates possibilities of
improper fuel delivery related to the water
temperature sensor.
Procedure: STEP1: Disconnect and remove
Engine Head Temperature Sensor (page
3C-40).
STEP 2: Connect Digital Meter set at “2K Scale”
(from EFI Tester P/N 91-11001A2) to
bullet leads of sensor.
STEP 3: Place sensor in ice water while monitor-
ing meter reading. Use graph (below) for
reference.
NOTE: Temperature/resistance reading may differ
slightly from graph curve.
Results: Resistance does not change inversely with
temperature change. Replace defective
Engine Head Temperature Sensor.
Resistance changes inversely with temperature
change. Engine Head Temperature Sensor OK.
Detonation Control System Test (200
Models Only)
Purpose: This test eliminates possibilities of improp-
er fuel delivery due to failure in detonation
control.
Procedure: STEP 1: Place outboard in water,
install timing light to number one cylinder.
STEP 2: Start engine, allow to warm up. Advance
throttle (between 3000-3500 RPM in
gear). NOTE: Timing advancement.
Results: Timing advances from 19° to 25° BTDC
system functioning properly.
Timing advance from 19° to 25° but retards while
maintaining a steady throttle position. System func-
tioning properly detonation may be occurring. See
Detonation Sensor/Module Checks (following).
Timing advancement does not occur (19° to 25°
BTDC). System functioning properly detonation may
be occurring. See Detonation Sensor/Module
Checks (following).
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