Remedy 3

When taking measurements start and run engine. Also turn On all electric devices one at a time.
To avoid damaging ohmmeter when measuring resistance to battery positive terminal, do not ground instrument.
1. Disconnect connector H4-10 (H4-11), then using ohmmeter, measure wiring resistance to front sensor as follows:
a. On front sensor 1, measure between pin 1 and battery positive terminal, pin 3 and battery positive terminal.
b. On front sensor 2, measure between pin 1 and battery positive terminal, pin 2 and battery positive terminal.
c. If any resistance values are equal to or less than 1000 ohms, the fault could be in the wiring between connector H4-10 (H4-11) and H3-16 (H3-17) or in wiring between connector H3-16 (H3-17) and front sensor. Proceed to step 2.
d. If all resistance values are greater than 1000 ohms, proceed to step 4.
2. Disconnect connector H3-16 (H3-17). Using ohmmeter at connector H4-10 (H4-11), measure wiring resistance to front sensor as follows:
a. On front sensor 1, measure between pin 1 and battery positive terminal, pin 3 and battery positive terminal.
b. On front sensor 2, measure between pin 1 and battery positive terminal, pin 2 and battery positive terminal.
c. If any resistance values are equal to or less than 1000 ohms, the fault is in wiring between connector H4-10 (H4-11) and H3-16 (H3-17).
d. If all resistance values are greater than 1000 ohms, proceed to step 3.
3. Measure from connector H3-16 (H3-17) to front sensor as follows:
a. Measure between pin 1 and battery positive terminal, pin 3 and battery positive terminal.
b. If either resistance values is less than 1000 ohms, the fault is in the front sensor. Install new sensor.
4. The fault could be in the wiring between connector H4-10 (H4-11) and electronic unit.