Customer Concern: Infiniti Malfunction Indicator Light (MIL) is on. Exhaust Valve Timing (EVT) control codes P0014, P0024. Cleared the codes and they returned. Scan tool has the actuator test for the exhaust valve timing control but there is no engine change.
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Average Reported Mileage: 117513
Tests/Procedures: 1. Clear the codes.
2. Scope the pulsed voltage signals to the exhaust valve timing control magnet retarder at terminal 6 and terminal 7 of connector F101 of the Engine Control Module (ECM) or scope then at the magnet retarder and look for 0-12 volt square wave signals at 1500 -2000 RPM.
3. Can try to operate the exhaust valve timing control with the scan tool and look for the square wave signal as well.
4. Ohm the exhaust valve timing control magnet retarder on each bank - specification is 9.0-11.0 ohms at 68 degrees F.
5. Remove the exhaust valve timing control magnet retarder on each bank and check the plate behind them for wear. May see one single groove. See if there is uneven wear.
6. Inspect the rear end of the camshaft signal plate for debris.
7. Perform the exhaust valve timing control learning procedure using the following procedure:
a. Start engine and warm it up to normal operating temperature.
b. Set selector lever to N position (A/T) or neutral position (M/T) and confirm that following electrical or mechanical loads are not applied.
- Foot on brake
- Headlamp switch is OFF
- Air conditioner switch is OFF
- Rear defogger switch is OFF
- The steering wheel is in the straight-ahead position, etc.
c. Keep the engine speed between 1,800 and 2,000 RPM at 20 seconds.
Tech Tips: Feedback from Infiniti is that the exhaust valve timing control magnet retarders are wearing and getting out of position changing the camshaft timing and setting the codes.
Sometimes just a relearn will fix P0024 and P0014
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Due to factors beyond the control of The Flat Rate Mechanic, it cannot guarantee against unauthorized modifications of this information or improper use of this information. The Flat Rate Mechanic assumes no liability for property damage or injury incurred as a result of any of the information contained in this automotive repair video. The Flat Rate Mechanic recommends safe practices when working on cars or trucks with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this repair video. Due to factors beyond the control of The Flat Rate Mechanic, no information contained in this automotive repair video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.
