Code No.P2765:
Malfunction of Turbine Speed Sensor
DIAGNOSTIC FUNCTION
The CVT-ECU determines whether the system is defective by monitoring the turbine speed
sensor.
JUDGEMENT CRITERIA
- The turbine speed remains at 150 r/min or less for five seconds
when two seconds or more have elapsed after the selector lever position is changed, the selector
lever is not at P or N range, the engine speed is 250 r/min or more, and the primary
pulley speed is 500 r/min or more.
- 0.5 seconds after the turbine speed has dropped abruptly from 1,000 r/min
or more to 150 r/min or less
- Turbine speed is found abnormal by comparing the engine speed and the primary pulley
speed.
PROBABLE CAUSES
- Malfunction of turbine speed sensor
- Damaged wiring harness and connectors
- Malfunction of CVT-ECU
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STEP 1. Check for open circuit in earth line between the turbine
speed sensor connector (terminal No. 3) and the body earth
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the connector(s) or the wiring harness.
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STEP 2. Voltage measurement at turbine speed sensor connector (terminal
No. 1)
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(1)Disconnect the turbine speed sensor connector, and measure at the wiring harness
side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Measure the voltage between the turbine speed sensor connector (terminal No. 1)
and body earth.
OK: 10 V or more
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Q.
Is the check result normal?
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Go to Step 3.
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NO : Repair the connector(s) or the wiring harness (power supply line between the turbine
speed sensor connector terminal No. 1 and the CVT control relay connector).
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STEP 3. Check for open circuit or short to earth in TRBS line between
the turbine speed sensor connector and the CVT-ECU connector
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or the wiring harness.
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STEP 4. Measure the output wave pattern of the turbine speed sensor
at CVT-ECU connector (TRBS terminal).
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(1)Connect the turbine speed sensor connector and CVT-ECU connector.
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(2)Selector lever position: Sport mode (1st gear).
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(3)Drive at a constant speed of approx. 20 km/h.
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(4)Connect an oscilloscope, and measure the voltage between CVT-ECU connector TRBS
terminal and body earth.
OK: A wave pattern such as the one shown on  (Check
Procedure Using an Oscilloscope) should be output. There should be no noise in the output wave
pattern.
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Q.
Is the check result normal?
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Go to Step 5.
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Visually check the tip of the sensor for deposits or damage, and repair or replace
the turbine speed sensor if necessary.
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STEP 5. Symptom recheck after erasing diagnosis code
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Q.
Is the diagnosis code set?
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Replace the CVT-ECU.
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Intermittent malfunction.
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