TOYOTA PREVIA 91-97 REPAIR MANUAL

DRIVEABILITY AND EMISSIONS CONTROLS 4-29

TESTING

1991 Models

I See Figure 91

1. Using a suitable ohmmeter, check the resistance cold between the
   terminals of the signal generator.


2. The signal generator (pick-up coil) resistance cold should be as follows:
   . NE-G-—180-220 ohms
   . G1-G-—140-180 ohms

• G2-G- —140-180 ohms

3. If the resistance is not correct, replace the distributor housing assembly.

1992 Models

1. Using a suitable ohmmeter, check the resistance cold between the
   terminals of the signal generator.


2. The signal generator (pick-up coil) resistance cold should be as follows:
   . NE-G-—155-240 ohms
   . G1-G-—125-190 ohms

• G2-G-—125-190 ohms

3. If the resistance is not correct, replace the distributor housing assembly.

Ohmmeter

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Fig. 91 Terminal identification otthe pick-up coil—2TZ-FE

engine

1993-95 2TZ-FE Engines

1. Using a suitable ohmmeter, check the resistance cold between the
   terminals of the signal generator.


2. The signal generator (pick-up coil) resistance cold should be as follows:
   . NE-G-—155-250 ohms

• G1-G 125-200 ohms


• G2-G-—125-200 ohms

3. If the resistance is not correct, replace the distributor housing assembly.

1995-97 2TZ-FZE Engines

» See Figure 92

1. Using a suitable ohmmeter, check the resistance of the signal generator.


2. Pick up coil resistance should be as follows:

• 1995 Cold—125-200 ohms
  . 1995 Hot—160-235 ohms
  . 1996 Cold—135-220 ohms
  . 1996 Hot—175-255 ohms


• 1997 Cold—125-200 ohms
  . 1997 Hot—160-235 ohms

Ohmmeter

Fig. 92 Testing the terminals of the pick-up coil—2TZ-FZE

engine

3. If the resistance is not correct, replace the distributor housing assem-
   bly.

REMOVAL & INSTALLATION

The camshaft position sensor is integrated with the distributor assembly.

If the camshaft position sensor is found to be faulty, the distributor assem-

bly must be replaced.

Crankshaft Position Sensor

OPERATION

The Crankshaft Position Sensor is only on the 2TZ-FZE engines. The

sensor (NE signal) consists of a signal plate and pickup coil. The NE signal

plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor

generates 34 signals for every engine revolution. The ECM detects the stan-

dard crankshaft angle based on the G signals, and the actual crankshaft

angle and the engine speed by the NE signals.

TESTING

*»The testing of this sensor is done with the engine hot and cold.

Cold is from 14-122°F (-10-50°C), hot is from 122-212°F

(50-100°C).

1. Disconnect the crankshaft position sensor wiring.


2. Using an ohmmeter, measure the resistance between terminals.
   
   
   • Cold—1630-2740 ohms
     . Hot—2065-3225 ohms
   
   
   
   


3. If the resistance is not as specified, replace the crankshaft position
   sensor.


4. Reattach the sensor wiring.

REMOVAL & INSTALLATION

1. Remove the No. 2 engine hanger.


2. Disconnect the crankshaft position sensor wiring.


3. Remove the 2 bolts and the crankshaft position sensor.
   To install:


4. Place the sensor into position and secure with the screws to 74 inch
   Ibs. (9Nm).


5. Attach the sensor wiring.


6. Install and secure the No. 2 engine hanger.