P0390
FA20 ENGINE CONTROL: SFI SYSTEM: P0365, P0366, P0390, P0391; Camshaft Position Sensor "B" Circuit (Bank 1); 2013 MY FR-S [03/2012 -]
P0365 - Camshaft Position Sensor "B" Circuit (Bank 1)
P0366 - Camshaft Position Sensor "B" Circuit Range / Performance (Bank 1)
P0390 - Camshaft Position Sensor "B" Circuit (Bank 2)
P0391 - Camshaft Position Sensor "B" Circuit Range / Performance (Bank 2)
DESCRIPTION
The exhaust camshaft VVT sensors consist of a magnet and MRE (Magnetic Resistive Element).
The exhaust camshaft has a sensor plate with 2 teeth on its outer circumference.
When the exhaust camshaft rotates, changes occur in the air gaps between the 2 teeth and MRE, which affects the magnet. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the exhaust camshaft rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.
The crank angle sensor generates 30 signals for each engine speed. Based on combination of the VVT signals and NE signal, the ECM detects the crankshaft angle. Then the ECM uses this data to control fuel injection time and injection timing. Also, based on the NE signal, the ECM detects the engine speed.
MONITOR DESCRIPTION
If no signal is transmitted by the VVT sensor despite the engine running, or the rotations of the camshaft and the crankshaft are not synchronized, the ECM interprets this as a malfunction of the sensor and the ECM illuminates the MIL and sets a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
P0365, P0390
P0366, P0391
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) Reading and Clearing Diagnostic Trouble Codes.
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON and turn the Techstream on.
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
7. With the vehicle stationary, depress the accelerator pedal and maintain an engine speed of between 2500 and 3000 rpm for 40 seconds or more [A].
8. Drive the vehicle at 10 km/h (6.25 mph) or more for 1 minute or more [B].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
9. Enter the following menus: Powertrain / Engine / Trouble Codes.
10. Read pending DTCs.
HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.
11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: P0365, P0366, P0390 or P0391.
13. Check the DTC judgment result.
HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.
14. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
* If DTC P0365 or P0366 is displayed, check the VVT sensor circuit for the right bank (bank 1).
* If DTC P0390 or P0391 is displayed, check the VVT sensor circuit for the left bank (bank 2).
* Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from transmission.
* Bank 2 refers to the bank that does not include the No. 1 cylinder.
* Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
* If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
PROCEDURE
1. CHECK VVT SENSOR FOR EXHAUST SIDE (SENSOR POWER SOURCE)
(a) Disconnect the VVT sensor for exhaust side connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- INSPECT RELAY (EFI MAIN1)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM)
(a) Disconnect the ECM connector.
(b) Disconnect the VVT sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open):
Standard Resistance (Check for short):
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM)
OK -- Continue to next step.
3. CHECK SENSOR INSTALLATION (VVT SENSOR FOR EXHAUST SIDE)
(a) Check the VVT sensor installation.
OK:
Sensor is installed correctly.
NG -- SECURELY REINSTALL VVT SENSOR FOR EXHAUST SIDE Installation
OK -- Continue to next step.
4. CHECK CAMSHAFT TIMING GEAR ASSEMBLY (TEETH OF PLATE)
(a) Check the teeth of the sensor plate.
OK:
Sensor plate teeth do not have any cracks or deformation.
NG -- REPLACE CAMSHAFT TIMING GEAR ASSEMBLY Removal
OK -- Continue to next step.
5. CHECK VALVE TIMING
(a) Check the valve timing Removal.
NG -- ADJUST VALVE TIMING Installation
OK -- Continue to next step.
6. REPLACE VVT SENSOR FOR EXHAUST SIDE
(a) Replace the VVT sensor for exhaust side Removal.
NEXT -- Continue to next step.
7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0365, P0366, P0390 OR P0391)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Turn the ignition switch off and wait for at least 30 seconds.
(f) Start the engine.
(g) Turn the Techstream on.
(h) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
(j) Read the DTC.
Result:
HINT
If the engine does not start, replace the ECM.
B -- REPLACE ECM Removal
A -- END
8. INSPECT RELAY (EFI MAIN1)
(a) Inspect the EFI MAIN1 relay Testing and Inspection.
NG -- REPLACE RELAY (EFI MAIN1)
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - EFI MAIN1 RELAY)
(a) Disconnect the VVT sensor for exhaust side connector.
(b) Remove the EFI MAIN1 relay from the engine room relay block assembly.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for open):
Standard Resistance (Check for short):
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM)
OK -- GO TO ECM POWER SOURCE CIRCUIT ECM Power Source Circuit