What is ecm-643 camshaft position, inlet -signal too high? Tech' says i need to realign timing belt. It will fix that problem if i realign the belt?

Computer Controlled Ignition Cam Sensor Signal Error The ECM receives a signal from the Camshaft Position Sensor based on the position of the camshaft. The ECM uses information from this sensor to help calculate fuel delivery and spark timing.
Fault Code Description

• 41 - Computer Controlled Ignition Cam Sensor Signal error

Inspect the reluctor wheel for signs of damage or looseness. Refer to Diagnostic Aids. If you find damage or looseness to the reluctor wheel, refer to Camshaft Replacement - Left Side in Engine Mechanical.
Did you find and correct the condition?

Diagnostic Aids
• The following conditions may cause this DTC to set:
- Camshaft reluctor wheel damage
- Incorrect sensor installation
- The sensor coming in contact with the reluctor wheel
- Excessive air gap between the reluctor wheel and the sensor magnet
- A cracked or damaged sensor
- Foreign material passing between the sensor and the reluctor wheel
• This DTC will set with an intermittent failure on the ignition 1 voltage circuit, the CMP sensor signal circuit, or the low reference circuit. A hard failure of any one of these circuits should set DTC P0342 or P0343.
• The CMP sensor low reference circuit is shared with the mass air flow (MAF) sensor, and the engine coolant temperature (ECT) sensor.

The camshaft position (CMP) sensor is a hall effect switching device that works in conjunction with a single tooth reluctor wheel used to determine the position of the bank 2 exhaust camshaft. The engine control module (ECM) expects the CMP sensor signal to be low, 0 volts, as the single tooth in the reluctor wheel passes the sensor, and high, 12 volts, during the remainder of the reluctor wheel rotation. The ECM supplies a 12-volt pull up voltage on the CMP sensor signal circuit. The ECM expects to see one transition from high to low every two crankshaft revolutions. This signal, when combined with the crankshaft position (CKP) sensor signal, enables the ECM to properly synchronize ignition timing, fuel delivery and knock control. As long as the CKP signal is available, the engine can start and run. The ECM will default to a non-sequential fuel injector operation even if there is no CMP sensor signal. If the ECM detects extra or missing CMP sensor signal transitions within a certain number of crankshaft revolutions, DTC P0341 sets.
The CMP sensor has the following circuits:
• Ignition 1 voltage circuit
• Low Reference circuit
• CMP sensor signal circuit

Your vehicle has no fuel pump relay . Has a fuel pump flow control module .
Fuel Pump Flow Control Module (FPCM)
The fuel pump flow control module (FPCM) is a serviceable GMLAN module. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and controls the fuel pump located within the fuel tank to achieve the desired fuel pressure. The FPCM sends a PWM signal to the fuel pump, and pump speed is changed by varying the duty cycle of this signal.
Plus it has two fuel pumps !
The high pressure fuel pump (9) is a mechanical one cylinder design driven by an eccentric on the exhaust camshaft (1) of bank 2. High pressure fuel is regulated by the fuel rail pressure (FRP) regulator, which is a part of the high pressure fuel pump. The FRP regulator is a magnetic actuator which controls the inlet valve of the high pressure pump. The ECM provides battery voltage on the actuator high circuit and ground on the actuator low reference circuit. Both circuits are controlled by the ECM. When the ECM deactivates the FRP regulator, both circuits are disabled and the inlet valve is held open with spring pressure. When the ECM activates the FRP regulator, the low circuit driver connects the low reference circuit to ground and the high circuit driver pulse-width modulates (PWM) the high circuit. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the FRP regulator with the position of the eccentric on the camshaft. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail. The high pressure fuel pump also contains an integrated pressure relief valve.
Your best bet is have it towed to the dealer , you don't want to mess with the high pressure pump .
Pluse

answer courtesy of obd-codes.com Potential causes of a P0026 diagnostic trouble code may include: Low engine oil level or contaminated oil Clogged oil system Malfunctioning control solenoid Malfunctioning camshaft actuator Timing chain/belt loose or incorrectly adjusted Malfunctioning ECM/PCM Possible Solutions Engine oil - Check the engine oil level to make sure engine oil capacity is sufficient. Since the actuators work on oil pressure, the proper amount of oil is critical to ensure proper operation of the VVT system. Dirty or contaminated fluid may cause buildup which can lead to failure of the control solenoid or the camshaft actuator. Control solenoid - The control solenoid for the camshaft can be checked for continuity using a Digital volt/ohm meter (DVOM) using the ohms function, by unplugging the solenoid wiring harness connector and checking the resistance of the solenoid with the (+) and (-) leads of the DVOM on each terminal. Ensure the internal resistance is within manufacturers specifications if available. If resistance is within specifications, remove the control solenoid to verify it is not contaminated, or if there is damage to the sealing O rings to cause a loss of oil pressure. Camshaft actuator - The camshaft actuator is a mechanical device controlled by internal spring pressure and adjusted by oil supplied by the control solenoid. When no oil pressure is supplied, it will default to a "safe" position. Refer to the manufacturers suggested procedure to remove the camshaft actuator from the engine's camshaft to ensure no leaks are present that would cause a loss of oil pressure to and from the actuator's hydraulic supply/return feed lines or within the actuator itself. Check timing chain/belt and components to ensure they are in proper working order and installed in the correct position on the camshaft gear. ECM/PCM - The ECM/PCM commands the control solenoid using a Pulse width modulated signal (PWM) to regulate the amount of on/off time, resulting in a control of the pressure used to move the camshaft actuator. A graphing multimeter or oscilloscope tool is required to view the PWM signal to ensure proper operation of the ECM/PCM. To check the PWM signal, the positive (+) lead is tapped into the ground side of the control solenoid ( if supplied by constant voltage, ground controlled ) or the powered side of the control solenoid (if permanently grounded, positive control ) and the negative (-) lead is attached to a good known ground. If the PWM signal is not consistent with changes in engine RPM, there may be a problem with the ECM/PCM

Read more at: http://www.obd-codes.com/p0026
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P0022 Toyota - Camshaft Position \'A\' Timing Over-Retarded Bank 2



























Possible causes




- Dirty Oil

- Faulty variable valve timing (VVT)

- Faulty oil control valve (OCV)

- Variable Valve Timing (VVT) harness is open or shorted

- Oil Control Valve (OCV) circuit is open or shorted

- Damaged Engine Control Module (ECM)




Tech notes



If the engine oil is clean and the VVT and OCV circuits are OK, replaced the VVT to resolve the problem.





When is the code detected?


After the ECM sends the target duty cycle signal to the OCV, the ECM monitors the OCV current to establish an actual duty cycle. The ECM determines the existence of a malfunction and sets the DTC when the actual duty cycle ratio varies from the target duty cycle ratio.


Possible symptoms


- Engine Light ON (or Service Engine Soon Warning Light)

- Lack/Loss of power

- Engine rough idle


P0022 Toyota Description


The Engine Control Module (ECM) controls the Oil Control Valve (OCV) to regulate the intake camshaft angle. As a result of the angle change, the engine timing is advance or retard. Optimizing engine timing will help the engine improve torque and fuel economy, and the exhaust emissions decrease under overall driving conditions. The Variable Valve Timing (VVT) system includes the Oil Control Valve (OCV) and VVT controller. The ECM detects the actual intake valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control.

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P0340 - Camshaft Position Sensor 'A' Circuit Malfunctionhttp://engine-codes.com/p0340.htmlForum CodePossible causes- Camshaft Position Sensor harness is open or shorted
- Camshaft Position Sensor circuit poor electrical connection
- Faulty Camshaft Position Sensor
- Faulty starter motor
- Starting system circuit
- Dead (Weak) battery Tech notes Sometimes and in some models, low battery voltage or a weak starter can can trigger a Camshaft Position Sensor code.
When is the code detected?The camshaft position sensor signal is not detected by the Engine Control Module(ECM) during the first few seconds of engine crankingSymptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- Engine StallP0340 Description The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. This information is used by the Engine Control Module(ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of camshaft (intake) to identify a particular cylinder. The camshaft position sensor senses the piston position. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.

P0019: Cam/Crankshaft Pos. Correlation Sensor B - Bank 2
P0018: Cam/Crankshaft Pos. Correlation Sensor A - Bank 2
P0008: Engine Position System Performance (Bank 1)

P0019 & P0018
- Dirty Oil
- Engine mechanical problems
- Timing belt jumped teeth

P0008
- Engine mechanical problems
- Incorrect timing chain
- Stretched timing chain
- Failed camshaft actuator or actuator solenoid

The Engine Control Module (ECM) monitors the position of both camshafts and the crankshaft. The ECM performs a test for misalignment between both camshafts on one bank of the engine and the crankshaft. During the test the ECM learns the position of the camshafts and the crankshaft. While the engine is idling, the ECM compares the position of both the camshafts and the crankshaft with the learned value. The ECM will set the P0008 code if both learned values for one bank of the engine are exceeding a calibrated threshold in the same direction.

DTC P2089 A - Camshaft Pos Actuator Ctrl Circ Hi Bank1
On this code the cam or crank sensor is normally the culprit. I would replace the crankshaft position sensor. There is anothe possible sensor that can cause this to happen vehicle speed sensor and engine coolant temp sensor. The way it works is The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range. But the most common problem is the cam or crank sensor Start with the crankshaft sensor and then camshaft sensor.

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When there is a gap between angle of target and phase-control angle degree, the valve will stop working and the ECM will trigger the P0011 code.

P0011 NISSAN - Intake Valve Timing Control Performance Bank 1
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake valve.

The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to increase engine torque in low/mid speed range and output in high-speed range.

The intake valve timing control solenoid valve changes the oil amount and direction of flow through intake valve timing control unit or stops oil flow. The longer pulse width advances valve angle. The shorter pulse width retards valve angle. When ON and OFF pulse widths become equal, the solenoid valve stops oil pressure flow to fix the intake valve angle at the control position.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible engine lack/loss of power
- Posssible engine rough idle

Possible causes
- Harness or connectors
- Intake valve timing control solenoid valve circuit is open or shorted
- Intake valve timing control solenoid valve may be faulty
- Crankshaft position sensor (POS) may be faulty
- Camshaft position sensor

Tech notes
Since the Intake valve timing control solenoid valve uses oil flow to control timing, dirty oil can cause the valve to stuck open or close. Before replacing the valve, change engine oil and filter and reset engine code.


Hope thsis helps (remember to rate this answer).

All ways, the camshaft position sensor signal sent to the ECM is intermittent

The Camshaft Position Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. This information is used by the Powertrain Control Module (PCM) or Electronic Control Module(ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of camshaft (intake) to identify a particular cylinder. The camshaft position sensor senses the piston position. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.

When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.

When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.

Check thos DTC diagnostic and possible solutions about P0344 - Camshaft Position Sensor Circuit Intermittent

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power
- Engine Stall

Possible causes
- Harness or connectors (The sensor circuit is open or shorted)
- Camshaft position sensor may be faulty
- Camshaft (Intake) may be damage
- Starter motor may be faulty
- Starting system circuit
- Dead (Weak) battery

Possible solution
- Charge battery
- Repair harness or connector
- Replaced Camshaft Position Sensor.
Tech notes
- Sometimes and in some models, low battery voltage or a weak starter can can trigger a Camshaft Position Sensor code.


Hope this helps.