Sensor Signal Test

1. Investigate the Input Signal System
(1) When you get an unusual signal, measure the #1 PCM terminal voltage.
- If the #1 terminal voltage and the NGS monitor voltage are the same, proceed to the next step.
- If there is a difference of 0.5V or more, check the following points concerning the PCM connector:
- Female terminal opening loose
- Coupler (pin holder) damage
- Pin discoloration (blackness)
- Harness/pin crimp is loose or disconnected
(2) When you get an unusual signal, measure the #2 sensor terminal voltage.
- If there is a 0.5V or more difference between the sensor and NGS voltages, check the harness for open or short circuits.
- If the sensor and NGS voltages are the same, check the following points concerning the sensor connector. If there are no problems, proceed to Step 2 below.
- Female terminal opening loose
- Coupler (pin holder) damage
- Pin discoloration (blackness)
- Harness/pin crimp is loose or disconnected
2. Investigate the GND System
(1) Confirm that sensor #3 is at 0V.
- If it is at 9V, proceed to Step 3.
- If it is not at 0V, check the following points:
- Open circuit in harness
- Female terminal opening loose
- Coupler (pin holder) damage
- Pin discoloration (blackness)
- Harness/pin crimp is loose or disconnected
3. Inspect the sensor according to the workshop manual. If necessary, replace the sensor.