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FJR Motorcycle Forums
Technical & Mechanical Problems
Problem after Barbarian Mod
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<blockquote data-quote="ionbeam" data-source="post: 176475" data-attributes="member: 277"><p>wallypiper writes:</p><p></p><p>You are correct, the FSM is confusing. The sensor <u>is</u> a thermistor. The ECU uses the resistance variance to determine fuel enrichment during warm-up. It also looks at the thermistor resistance MIN/MAX only to determine Radiator Fan ON/OFF switching.</p><p>The test you refer to is looking for "continuity YES/NO". In the setup for this test the FSM asks you to set your test meter to the X 1 ohm scale. This causes the cold readings to be off-scale (too high for the meter range selected) so it appears to be "continuity NO". As the sensor heats the resistance becomes lower (more conductive). By 100°C the thermistor resistance will have dropped to the point where it becomes within the selected meter range making it appear to be "continuity YES". This test ignores the entire middle resistance range of the thermistor. This test is adequate only for determining if the RADIATOR FAN TURNS ON/OFF. IMO, the FSM should have second Coolant Sensor test in the Fuel Injection section. In this test the FSM would guide you through Coolant Temperature Sensor testing to verify that the thermistor resistance varies linearly between 322 ohms @ 80°C and 15.5k ohms at -20°C .</p></blockquote><p></p>
[QUOTE="ionbeam, post: 176475, member: 277"] wallypiper writes: You are correct, the FSM is confusing. The sensor [U]is[/U] a thermistor. The ECU uses the resistance variance to determine fuel enrichment during warm-up. It also looks at the thermistor resistance MIN/MAX only to determine Radiator Fan ON/OFF switching. The test you refer to is looking for "continuity YES/NO". In the setup for this test the FSM asks you to set your test meter to the X 1 ohm scale. This causes the cold readings to be off-scale (too high for the meter range selected) so it appears to be "continuity NO". As the sensor heats the resistance becomes lower (more conductive). By 100°C the thermistor resistance will have dropped to the point where it becomes within the selected meter range making it appear to be "continuity YES". This test ignores the entire middle resistance range of the thermistor. This test is adequate only for determining if the RADIATOR FAN TURNS ON/OFF. IMO, the FSM should have second Coolant Sensor test in the Fuel Injection section. In this test the FSM would guide you through Coolant Temperature Sensor testing to verify that the thermistor resistance varies linearly between 322 ohms @ 80°C and 15.5k ohms at -20°C . [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Problem after Barbarian Mod
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