General Information

Input Signal System Investigation Procedure

1. Find an unusual signal. (Refer to procedures below.)
2. Locate its source. (Refer to procedures below.)
3. Repair or replace the malfunctioning parts.
4. Confirm that the unusual signal has been erased.

Finding unusual signals

While referring to the DTC inspection of the on-board diagnostic system, use the PID/DATA MONITOR AND RECORD function to inspect the input signal system relating to the problem.
1. Turn the ignition on and idle the vehicle. You can assume that any signals that are out of specifications by a wide margin are unusual.
2. When recreating the problem, any sudden change in monitor input signals that is not consciously created by the driver can be judged as unusual.

Locating the source of unusual signals

CAUTION:
- Compare the NGS monitor voltage with the measurement voltage using the DIGITAL MEASUREMENT SYSTEM function. If you use another tester, misreading may occur.
- When measuring voltage, attach the tester Ground to the Ground of the PCM that is being tested, or to the engine itself. If this is not done, the measured voltage and actual voltage may differ.
- After connecting the pin to a waterproof coupler, confirming continuity and measuring the voltage, inspect the waterproof connector for cracks. If there are any, use sealant to fix them. Failure to do this may result in deterioration of the harness or terminal from water damage, leading to problems with the vehicle.