How to test a 2004 Honda Civic cps sensor with a voltmeter

First take #6 fuse out from underhood box for 10 secondsto reset ecm. Start car and see if it still does it. Dtc p0335: ckp sensor no signal, dtc p0336: ckp sensor intermittent interruption, dtc p0339: ckp sensor intermittent interrupti

note: ? Information marked with an asterisk (*) applies to '01 03 models.
? Information marked with an asterisk (**) applies to '04 model.

1. Reset the ecm/pcm (see how to reset the ecm/pcm ).
2. Start the engine.

Is dtc p0335 and/or p0336* (p0339)* indicated?

Yes go to step 3.
No intermittent failure, system is ok at this time. Check for poor connections or loose terminals at the ckp sensor and at the ecm/pcm.
3. Turn the ignition switch off.
4. Disconnect the ckp sensor 3p connector.
5. Turn the ignition switch on (ii).
6. Measure voltage between ckp sensor 3p connector terminal no. 3 and body ground.

Fig. 82: measuring voltage between ckp sensor 3p connector terminal no. 3 & body ground
courtesy of american honda motor co, inc.

Is there battery voltage?

Yes go to step 7.
No repair open in the wire between pgm fi main relay 1 and the ckp sensor.
7. Measure voltage between ckp sensor 3p connector terminal no. 1 and body ground.

Fig. 83: measuring voltage between ckp sensor 3p connector terminal no. 1 & body ground
courtesy of american honda motor co, inc.

Is there about 5 v?
Yes repair open in the wire between the ecm/pcm (a7) and the ckp sensor.
No go to step 11.
11. Turn the ignition switch off.
12. Disconnect ecm/pcm connector a (31p).
13. Check for continuity between ecm/pcm connector terminal a7 and body ground.

Fig. 86: checking continuity between ecm/pcm connector terminal a7 & body ground
courtesy of american honda motor co, inc.

Is there continuity?

Yes repair short in the wire between the ecm/pcm (a7) and the ckp sensor.
No update the ecm/pcm if it does not have the latest software, or substitute a known good ecm/pcm, then recheck (see how to substitute or replace the ecm/pcm ). If the
symptom/indication goes away with a known good ecm/pcm, replace the original ecm/pcm.