| All values measured to ground unless otherwise noted | |||
| N3/4 | |||
| 2.29 2.30 |
Rpm signal input low side high side |
Engine at idle measure across pin 2.29 and 2.30 > 3VAC |
Feed from L5 |
| 1.18 | Rpm signal output, controls (EA/)CC/ISC system and tachometer A1p5 | Engine at idle > 3VAC | Feed to Z2 |
| A1 | |||
| 1.3 | Engine rpm signal input, indicates rpm signal (A1p5) | same as N3/4 Pin1.18 | Feed from Z2 |
| N4/1 | |||
| 7 (up to 05/ 94) |
Engine rpm signal input, enables EA function | same as N3/4 Pin1.18 | Feed from Z2 |
| 2.34 (as of 06/ 94) |
Engine rpm signal input, enables CC/ISC function | same as N3/4 Pin1.18 | Feed from Z2 |
| N15 | |||
| 2 | Engine rpm signal input, controls HVAC function | same as N3/4 Pin1.18 | Feed from Z2 |
| N59/1 | |||
| 1.19 | Engine rpm signal input for diagnostic purposes | same as N3/4 Pin1.18 | Feed from Z2 |
| Note 1 | To test, spin wheel at 1 rev/sec, measure at least 120 mVAC between both wires of sensor. If voltage is OK, measure the sensor's resistance while pulling, twisting and bending the sensor wires, looking for intermittent opens. Finally, check the sensor tip and rotor teeth for dirt or breakage. An oscilloscope can also be used to check the waveform - chipped or dirty teeth show up as missing or malformed waves. | ||