PunkRudeBoy

Ok so I got a 97 civic ex, mt. I took the thing to get smoged and during the pre test the tech said the readiness monitors aren't set and to drive the car some more. I've driven the thing over a 100 miles on and off the highway, letting the car warm up, with the ac on and the recommended amount of gas like the OBDII drive cycles recommend, but the damn things aren't going to ready. Cat, o2, evap etc. I'm thinking the ECU maybe resetting every time I shut the car off due to bad fuse or something?

As always, helps appreciated.

Former User

Check whether the 7.5A hood Back Up fuse is blown.

PunkRudeBoy

Is there a diagram online somewhere that way I can make sure im checking the right one?

Former User

Fuse box diagrams can be found in the FAQs sticky.

PunkRudeBoy

I found it much appreciated!

PunkRudeBoy

Ok I checked the fuse and it appears to be in good shape, There's nothing charred or broken. One thing i did notice is all the numbers on the fuses were right side up while 44 the "15" was upside down. Would that effect anything + or -?

Former User

Click the Test Fuses link in my signature. Test for voltage individually at both top test tabs of the installed Back Up fuse (fuse 47).

That's fine.

PunkRudeBoy

Ok I got a tester on it. Light lit up on both post. Fuse is good.

PunkRudeBoy

bump for night people

PunkRudeBoy

Still looking for help and suggestions on this.

90sedan

How long ago was it tested? How many complete drive cycles have you put on the vehicle? After letting the vehicle sit for awhile shut off, does every single readiness monitor reset, or do a few just never complete?

Your battery is in good shape right?

Former User

To store ECU memory, the Back UP fuse (7.5A fuse 47) supplies ECU terminal C10 with voltage through the Wht/Blu wire. Unplug ECU connector C and check for voltage at terminal C10. Do you measure battery voltage?





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PunkRudeBoy

The battery was replaced with a new Die Hard then we put on around a 100 miles. I'm going to have to check the C10 voltage. Pretty much flying solo when it comes to this so that ones gonna take me some time haha.

90sedan

Make sure when checking the voltage at the ecu that you backprobe the connector. There are special digital multimeter backprobes that work great, or a small paperclip/needle will do the job as well. Just don't wedge anything into the front of the connector where the pins fit into the ecu.

PunkRudeBoy

So I just use your everyday multimeter? What do i set the multimeter to? And i test it at the back of the wire where it runs into the connector, not at the front where the pin hole is?

Former User

There's no need to back probe the connector terminal in this case. Simply unplugging ECU connector and measuring voltage at C10 is sufficient.

Use a basic digital multimeter set to measure DC voltage (DCV). A low scale such as DCV 20 is fine. Touch the + meter probe to C10 in the ECU connector (not ECU) and the - probe to the metal frame under the dash. What is the reading?

PunkRudeBoy

*Update* turns out my gas cap was bad, so I picked up an OEM one from the dealer and drove around a bit and my 1st monitor cleared. Do they all need to be ready to pass in Cali or 2/3, etc?