Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Camshaft Position (CMP) Sensor

Print

OPERATION



Like most Camshaft Position (CMP) sensors in computer-controlled vehicles, these sensors are basically a Hall-Effect switch. A pick-up coil and a toothed piece, usually called a "reluctor" or "signal plate," are mounted very close to each other with a small air gap separating them. When a tooth aligns with the pick-up coil a small voltage is induced, then read and interpreted by the ECM so it can compute the proper time to fire the ignition coil and also the fuel injectors. A failed CMP sensor should set a Diagnostic Trouble Code (DTC).

1FZ-FE Engine

The Camshaft Position (CMP) sensor provides the G1 and G2 signals. It consists of a signal plate and a pick-up coil. The G1 and G2 signal plates each have one tooth on the outer circumference and are built into the distributor. When the camshaft rotates, the tooth on the signal plate comes close to the pick-up coil and the air gap on the pick-up coil changes. This causes fluctuations in the magnetic field, generating a small voltage in the pick-up coil. The ECM detects the standard crankshaft angle based on the G1 and G2 signals, detects the actual crankshaft angle and engine speed by the NE signal (generated in a similar manner by the crankshaft position sensor) and even detects misfire by the NE2 signal.

2RZ-FE and 3RZ-FE Engines

The Camshaft Position (CMP) sensor provides the G signal to the ECM. The rotating signal plate has one tooth on its circumference and is built into the distributor. When the camshafts rotate, the tooth on the signal plate comes close to the pick-up coil and the air gap on the pick-up coil changes. This causes fluctuations in the magnetic field, generating a small voltage in the pick-up coil. At the same time, the crankshaft position sensor signal plate (equipped with 34 teeth and mounted on the crankshaft) generates 34 signals for every engine revolution. The ECM detects the standard crankshaft angle based on the camshaft position sensor G signals and the actual crankshaft angle and engine speed by the NE signals.

5VZ-FE Engine

The Camshaft Position (CMP) sensor is installed on the front of the right cylinder head of the 5VZ-FE engine. The timing rotor has been integrated with the right bank camshaft timing pulley. While the camshaft rotates, the air gap between the protrusion on the timing rotor and the pick-up coil changes. This causes fluctuation in the magnetic field and generates a voltage signal in the pick-up coil.

2UZ-FE Engine

The Camshaft Position (CMP) sensor provides the G signal to the ECM. Like other Toyota CMP sensors, it consists of a magnetic core and a pick-up coil. The signal plate has one tooth and is installed on the left side camshaft timing pulley. When the camshafts rotate, the tooth comes near the pick-up coil. This causes fluctuation in the magnetic field and generates a voltage signal in the pick-up coil.

TESTING



1FZ-FE Engine


Click image to see an enlarged view

Fig. CMP sensor testing and circuit schematic1997 1FZ-FE engine

  1. Detach the Camshaft Position (CMP) sensor connector.
  2.  
  3. Using an ohmmeter, measure the resistance between terminals 2 , 3 and 4 of the distributor connector.
  4.  
  5. On a cold engine, with the coolant temperature below 122° F (50° C), resistance should be 185275 ohms.
  6.  
  7. On a hot engine, with the coolant temperature of 122212° F (50100° C), resistance should be 240325 ohms.
  8.  
  9. If the resistance is not as specified, replace the camshaft position sensor.
  10.  

2RZ-FE Engine


Click image to see an enlarged view

Fig. The CMP sensor signal generator is located inside the distributor and is checked with an ohmmeter2RZ-FE Engine

  1. Detach the Camshaft Position (CMP) sensor connector.
  2.  
  3. Using an ohmmeter, measure the resistance between terminals G+ and G .
  4.  
  5. On a cold engine, with the sensor temperature below 122° F (50° C), resistance should be 185275 ohms.
  6.  
  7. On a hot engine, with the sensor temperature of 122212° F (50100° C), resistance should be 240325 ohms.
  8.  
  9. If the resistance is not as specified, Toyota recommends that the distributor housing be replaced.
  10.  
  11. The air gap should be checked. Using a feeler gauge, measure the air gap between the signal rotor and the pick-up coil. It should be 0.0080.016 inch (0.20.4mm). If the air gap is not as specified, Toyota recommends that the distributor housing be replaced.
  12.  

3RZ-FE, 5VZ-FE and 2UZ-FE Engines


Click image to see an enlarged view

Fig. Camshaft Position (CMP) sensor testing and component location3RZ-FE engine



Click image to see an enlarged view

Fig. Camshaft Position (CMP) sensor testing and component location5VZ-FE engine



Click image to see an enlarged view

Fig. Camshaft position sensor testing and component location2UZ-FE engine

  1. Detach the Camshaft Position (CMP) sensor connector.
  2.  
  3. Using an ohmmeter, measure the resistance between terminals.
  4.  
  5. On a cold engine, with the sensor temperature below 122° F (50° C), resistance should be 8351400 ohms.
  6.  
  7. On a hot engine, with the sensor temperature of 122212° F (50100° C), resistance should be 10601645 ohms.
  8.  
  9. If the resistance is not as specified, replace the camshaft position sensor.
  10.  

REMOVAL & INSTALLATION



3RZ-FE Engine


Click image to see an enlarged view

Fig. Camshaft Position (CMP) sensor component location3RZ-FE engine

  1. Remove the throttle body. The cooling system has to be drained since the throttle body has two water hoses connected to it, to warm the throttle body and prevent icing. Tag for identification, all of the vacuum hoses that must be disconnected from the intake air connector and the throttle body.
  2.  
  3. Locate the Camshaft Position (CMP) sensor where it mounts to the left side of the engine. Detach the electrical connector. Remove the sensor hold-down bolt and remove the sensor.
  4.  
  5. Installation is the reverse of the removal procedure. Tighten the sensor hold-down bolt to 48 inch lbs. (5.4 Nm).
  6.  

5VZ-FE Engine


Click image to see an enlarged view

Fig. Location of the Camshaft Position (CMP) sensor5VZ-FE engine



Click image to see an enlarged view

Fig. Exploded view of the CMP Sensor mounting5VZ-FE engine

  1. Remove the timing belt cover that goes over the cam drive sprockets.
  2.  
  3. Locate the camshaft position sensor where it mounts to the right side cylinder head. Detach the electrical connector. Remove the sensor hold-down bolt and remove the sensor.
  4.  
  5. Installation is the reverse of the removal procedure. Tighten the sensor hold-down bolt to 69 inch lbs. (7.8 Nm).
  6.  

2UZ-FE Engine


Click image to see an enlarged view

Fig. Location of the Camshaft Position (CMP) sensor2UZ-FE engine

  1. Drain the engine coolant.
  2.  
  3. Remove the accessory drive belt(s).
  4.  
  5. Remove the left side timing belt cover.
  6.  
  7. Locate the camshaft position sensor where it mounts to the left side cylinder head. Detach the electrical connector. Remove the sensor hold-down bolt and the stud bolt. Remove the camshaft position sensor.
  8.  
  9. Installation is the reverse of the removal procedure. Tighten the sensor hold-down bolt to 66 inch lbs. (7.5 Nm).
  10.  

 
label.common.footer.alt.autozoneLogo