Code No. P0715,
P0720, P0791 (Simultaneous detection) : Malfunction of Speed Sensor Power Supply Circuit
DIAGNOSTIC FUNCTION
The CVT-ECU determines whether the system is defective by monitoring the primary pulley
speed sensor, secondary pulley speed sensor and output speed sensor.
JUDGEMENT CRITERIA
- All the conditions listed below remain for 5 seconds.
- Selector lever position: "D", "L" or "R" range.
- The primary pulley speed is less than 150 r/min.
- The secondary pulley speed is less than 150 r/min.
- The output speed is less than 150 r/min.
- The revolution per minute of the engine to the torque is equal to or faster than
a specified value.
PROBABLE CAUSES
- Damaged wiring harness and connectors
- Malfunction of all speed sensor (primary pulley speed sensor, secondary pulley speed
sensor and output speed sensor)
- Malfunction of CVT-ECU
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STEP 1. Check the following connector.
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- Primary pulley speed sensor connector
- Secondary pulley speed sensor connector
- Output speed sensor connector
- CVT-ECU connector
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Check the terminals for a contact status problem and internal short circuit.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the defective connector.
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STEP 2. Check for open circuit in SGN2 line between the primary pulley
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 3.
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Repair the connector(s) or the wiring harness.
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STEP 3. Voltage measurement at primary pulley speed sensor connector
(terminal No. 1).
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(1)Disconnect the primary pulley 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 primary pulley 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 4.
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NO : Repair the connector(s) or the wiring harness (power supply line between the primary
pulley speed sensor connector terminal No. 1 and the J/B connector).
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STEP 4. Check for open circuit in SGN2 line between the secondary
pulley 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 5.
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Repair the connector(s) or the wiring harness.
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STEP 5. Voltage measurement at secondary pulley speed sensor connector
(terminal No. 1).
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(1)Disconnect the secondary pulley 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 secondary pulley 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 6.
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NO : Repair the connector(s) or the wiring harness (power supply line between the secondary
pulley speed sensor connector terminal No. 1 and the J/B connector).
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STEP 6. Check for open circuit in SGN2 line between the output 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 7.
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Repair the connector(s) or the wiring harness.
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STEP 7. Voltage measurement at output speed sensor connector (terminal
No. 1).
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(1)Disconnect the output 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 output 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 8.
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NO : Repair the connector(s) or the wiring harness (power supply line between the output
speed sensor connector terminal No. 1 and the J/B connector).
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STEP 8. 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 (Refer to GROUP 00 - How to Cope with Intermittent
Malfunctions).
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