Obd doesn’t ready codes!!

[Pedro423]

I recently bought a ‘00 civic Lx with engine swap and it has a check engine light, but I’ve been to 3 different places to scan the codes and they don’t read, the OBD doesn’t read. I checked the fuse and it’s fine. Why is the obd not reading ?? I need help!!

 

[Brak]

you mention an engine swap, so i assume it has a different ECU than stock?

Is that ECU even connected to the OBD port?
If its an aftermarket unit, You may have to read the codes directly from it, using usb, or serial connection, with special software.

 

[Pedro423]

Yea it has different ECU, is there any way I can connect it to OBD port ? Or will I need the original ECU?

 

[nd4sped]

Yea it has different ECU, is there any way I can connect it to OBD port ? Or will I need the original ECU?

What ecu does it have in it now? Could you post some photos.

 

[Pedro423]

[/QUOTE]

What ecu does it have in it now? Could you post some photos.

Yea I’ll post some right now !

 

[Pedro423]

What ecu does it have in it now? Could you post some photos.

 

[nd4sped]

There should be a label on the case starting with a Pxx-xx

 

[Pedro423]

There should be a label on the case starting with a Pxx-xx

Yes, it’s P72-A01

 

[nd4sped]

Yes, it’s P72-A01

Seems that your harness may not be passing through the OBD connector. Also since its OBD1 you may need to manually enable the ECU codes to flash.

Under the glove compartment there is a green or blue clip holding two connectors. Once of the clips has two connections that you can jump with a paper clip. Once you turn the key to on position the CEL will begin to flash.

 

[nd4sped]

0 Faulty PCM (Powertrain Control Module)
1 Oxygen content
3+5 Manifold absolute pressure
4 Crankshaft position sensor
6 Coolant temperature
7 Throttle angle (Throttle position sensor)
8 TDC Position (Top Dead Center)
9 No. 1 cylinder position (CYP sensor)
10 Intake air temperature
12 Exhaust Gas Recirculation system
13 Barometric pressure
14 Idle air control (IAC) valve
15 Ignition output system
16 Fuel Injector
17 Vehicle speed sensor
19 Lock-up control solenoid
20 Electronic load detector
21 Variable Valve Timing and Valve lift solenoid (VTEC solenoid)
22 Variable Valve Timing and control pressure switch
23 Knock sensor
30 A/T FI signal A
41+48 Oxygen sensor heater
43 Fuel supply system