No spark

Hi,

If there is no RPM signal, the first thing I would check is the crankshaft position sensor. Take a look through this link:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Here are directions specific to testing the one on your vehicle. The attached pics correlate with the directions.

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1999 Lexus Truck RX 300 FWD V6-3.0L (1MZ-FE)
Component Inspection
Vehicle Powertrain Management Sensors and Switches - Powertrain Management Sensors and Switches - Computers and Control Systems Crankshaft Position Sensor Testing and Inspection Component Tests and General Diagnostics Component Inspection
COMPONENT INSPECTION
NOTE: "Cold" and "Hot" in these sentences express the temperature of the sensor itself. "Cold" is from - 10°C (14° F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F).

INSPECT CRANKSHAFT POSITION SENSOR RESISTANCE
Using an ohmmeter, measure the resistance between terminals.
Resistance:

pic 1

pic 2

pic 3

RESISTANCE

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

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Let me know what you find. Also, let me know the codes that were pulled when it was checked.

Take care,
Joe