Inspection Procedure

HINT:

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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

1. CHECK CAMSHAFT POSITION SENSOR ASSEMBLY (SENSOR POWER SOURCE) 
   1. Disconnect the C1 camshaft position sensor connector.
   2. Turn the ignition switch ON.
   3. Measure the voltage between terminal 3 of the camshaft position sensor connector and body ground.

      Standard voltage 

      STANDARD VOLTAGE
      
      

      Tester Connection	Specified Condition
      C1-3 - Body ground	4.5 to 5.0 V

   4. Reconnect the camshaft position sensor connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 1: Checking Camshaft Position Sensor Assembly (Sensor Power Source)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next Step 

2. CHECK ECM TERMINAL VOLTAGE 
   1. Inspect the ECM using an oscilloscope.
      1. While the engine is idling, check the waveform between the terminals of the ECM connector.

         Standard voltage 

         STANDARD VOLTAGE
         
         

         Tester Connection	Specified Condition
         G2+ (E7-19) - G2- (E7-29)	Correct waveform is as shown

         HINT:

         • *1: Crank angle
         • *2: 180°
         • *3: 120°
         • *4: 60°

   OK: REPLACE ECM 

   Fig 2: Checking ECM Terminal Voltage

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to Next Step 

3. CHECK HARNESS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR) 
   1. Disconnect the C1 Camshaft position sensor connector
   2. Disconnect the E7 ECM connector.
   3. Measure the resistance between wire harness side connectors.

      Standard resistance (Check for open) 

      STANDARD RESISTANCE
      
      

      Tester Connection	Specified Condition
      Camshaft position sensor (C1-2) - G2+ (E7-19)	Below 1 Ω
      Camshaft position sensor (C1-1) - G2- (E7-29)

      Standard resistance (Check for short) 

      STANDARD RESISTANCE
      
      

      Tester Connection	Specified Condition
      Camshaft position sensor (C1-2) or G2+ (E7-19) - Body ground	10 kΩ or higher
      Camshaft position sensor (C1-1) or G2- (E7-29) - Body ground

      Fig 3: Checking Harness And Connector (ECM - Camshaft Position Sensor)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the ECM connector.
   5. Reconnect the camshaft position sensor connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to Next Step 

4. INSPECT SENSOR INSTALLATION 
   1. Check the camshaft position sensor installation.

      OK: The camshaft position sensor is installed properly. 

   NG: SECURELY REINSTALL SENSOR 

   Fig 4: Inspecting Sensor Installation

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to Next Step 

5. INSPECT CAMSHAFT TIMING PULLEY LH (SIGNAL PLATE TOOTH) 
   1. Check the tooth of the signal plate.

      OK: The camshaft does not have any cracks or deformation. 

   NG: REPLACE CAMSHAFT TIMING PULLEY LH 

   OK: REPLACE CAMSHAFT POSITION SENSOR ASSEMBLY