Aprilia:

Engine temperature sensor (Aprilia Shiver 750)

Contents: Function ↓ Operating principle ↓ Axone: logic errors ↓

Function

It tells the engine temperature to the control unit so as to optimise its operation.

Operating principle

NTC type sensor (resistance sensor, inversely variable with temperature).

Level in wiring diagram: Temperature sensors

Location:

on the vehicle: on the front cylinder on the internal side facing the rear cylinder
connector: on the sensor

Electrical characteristics:

Resistance at 25°: 2.05 kOhm +/- 100 Ohm
Resistance at 60°: 575 Ohm +/- 15 Ohm
Resistance at 90°: 230 Ohm +/- 5 Ohm

Pin-out:

1. Yellow brown: 0-5 V signal: PIN B1
2. Brown: PIN B2 ground connection

[The original text is located on the resource: MotoInstruction]

Caution! Before carrying out any troubleshooting, carefully read the general troubleshooting concepts for electrical devices at the beginning of the check and control section in the electrical system chapter.

Axone: parameters

Engine temperature

Example value: 75°C

In case of recovery, this value is set by the control unit.

Engine Temp. before Recovery

Example value: -40°C

Value drawn from the signal read without taking into account any recovery: the value in the example refers to an open circuit.

Axone: electrical errors

engine temperature sensor P0115 - open circuit, shorted to positive / shorted to negative.

Error cause

If the circuit is open, shorted to positive: excessive voltage has been detected at PIN 45 of the ENGINE connector. If shorted to negative: voltage equal to zero has been detected at PIN 45 of the ENGINE connector.

If the circuit is open, shorted to positive: check the sensor connector and the Marelli control unit connector. If they are OK, check sensor continuity: replace the sensor if not OK; if it is OK, check the continuity between the ENGINE connector PIN 45 and the sensor PIN 1: restore cable harness if there is not continuity; if it is OK, reconnect the control unit connector and, with key set to key ON, check the continuity between the sensor connector PIN 2 and the vehicle ground connection: if it is correct, it means that the error cause is that the cable is short circuit to positive and it is necessary to restore the cable harness between the ENGINE PIN 45 and the sensor PIN 1; if there is no continuity with the ground connection, check the sensor connector and the Marelli control unit connector. If not OK, restore the cable harness. If OK, check continuity between the ENGINE connector PIN 35 and the sensor connector PIN 2: restore the cable harness if there is no continuity. If there is, it means that the control unit does not supply the ground connection and therefore should be replaced.

Troubleshooting

If shorted to negative, check sensor correct resistance: if resistance is null, replace the sensor; if resistance is correct, it means that the cable has ground connection: restore the cable harness.

Axone: logic errors

engine temperature sensor P0116 - signal not valid.

Error cause

An excessive temperature variation has been detected: for example, the cause may be a contact resistance between the terminals.

Troubleshooting

Check the sensor connector and the ENGINE connector of the Marelli control unit.

Note. No error is detected if the sensor does not work correctly or the control unit connector or sensor terminals are rusty: then check through Axone if the temperature indicated is plausible in relation to the engine temperature. Check also that the sensor electrical characteristics are observed: replace the sensor if not OK; if it is OK, check the sensor connector and the Marelli control unit connector.

See this article in russian language

This article has been reviewed: Serafim Sazonov

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Aprilia SL750 : Equipment and devices

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Intake air pressure sensor
Throttle grip position sensor — removal
Engine revolution sensor
Vehicle speed sensor

Intake air temperature sensor
Lambda sensor — function and operation
Injector — function and operation
Ignition coil — function and operation

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