STEP 1. Using scan tool (M.U.T.-III), check data list item 170: Variable Valve Lift Sensor.
caution | To prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III). |
(1) Connect scan tool (M.U.T-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) . (2) Start the engine and run at idle.
(3) Set scan tool (M.U.T.-III) to the data reading mode for item 170, Variable Valve Lift Sensor.
(4) Warm up the engine to normal operating temperature: 80°C to 95°C (176°F to 203°F).- Output voltage should be between 0.2 and 4.8 volts (depends on engine operation condition).
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions . Go to Step 2.
STEP 2. Measure the sensor supply voltage at variable valve lift sensor harness side connector.
(1) Disconnect the variable valve lift sensor connector and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal VLS5 line and ground.- Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Go to Step 5. Go to Step 3.
STEP 3. Check of short to ground and open circuit in VLS5 line between variable valve lift sensor connector and ECM connector.
STEP 4. Using scan tool (M.U.T.-III), check data list item 170: Variable Valve Lift Sensor.
(1) Start the engine and run at idle.
(2) Set scan tool (M.U.T.-III) to the data reading mode for item 170, Variable Valve Lift Sensor.
(3) Warm up the engine to normal operating temperature: 80°C to 95°C (176°F to 203°F).- Output voltage should be between 0.2 and 4.8 volts (depends on engine operation condition).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions . Replace the ECM (Refer to Removal and Installation ). Then go to Step 9.
STEP 5. Check of harness damage in VLS5 line between variable valve lift sensor connector and ECM connector.
STEP 6. Check of short to ground, open circuit and harness damage in VLS line between variable valve lift sensor connector and ECM connector.
STEP 7. Using scan tool (M.U.T.-III), check data list item 170: Variable Valve Lift Sensor.
(1) Start the engine and run at idle.
(2) Set scan tool (M.U.T.-III) to the data reading mode for item 170, Variable Valve Lift Sensor.
(3) Warm up the engine to normal operating temperature: 80°C to 95°C (176°F to 203°F).- Output voltage should be between 0.2 and 4.8 volts (depends on engine operation condition).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions . Go to Step 8.
STEP 8. Replace the variable valve lift sensor.
(1) Replace the variable valve lift sensor.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC P264C stored?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 9. The inspection is complete.
STEP 9. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 . (2) Check the diagnostic trouble code (DTC).
Is DTC P264C stored?
Retry the troubleshooting. The inspection is complete.