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.