No Power to IAC motor 89 Honda Civic

JDMEF916

MEMBER
1989 HONDA CIVIC
4 CYL
FWD
MANUAL

I am getting no voltage to the IAC motor on my 89 honda civic hatchback(d15b2) and I need to know where that wire goes after it goes through the firewall and under the dash so that I can test it for continuitity. Anybody know?

Friday, February 4th, 2011 AT 8:28 PM

1 Reply

KHLOW2008

MECHANIC
41,814 POSTS

CODE 14 - ELECTRONIC AIR CONTROL VALVE (EACV)

1. Turn ignition off. Remove hazard fuse in main fuse box for 10 seconds to reset ECU. Start engine and observe "CHECK ENGINE" light. If light is off, problem is intermittent. Test drive and check again.

2. If light is on, turn ignition off. Disconnect Electronic Air Control Valve (EACV) connector. Check resistance between the 2 connector terminals on valve.

3. Resistance should be 8-15 ohms. If not within specification, replace EACV. If resistance is within specification, proceed to next step.

4. Check for continuity to ground on each EACV connector terminal. If continuity exists, replace EACV. If no continuity exists, turn ignition on. Connect a voltmeter between Black/Yellow (pos.) And Blue/Yellow (neg.) Terminals.

5. Check for battery voltage. If no battery voltage exists, proceed to step 6). If battery voltage exists, disconnect "A" connector from ECU and measure voltage between Black/Yellow (pos.) And Blue/Yellow (neg.) Terminals. If battery voltage still does not exist, substitute a known good ECU and recheck. If condition is rectified, replace original ECU. If battery voltage does exist, repair short in Blue/Yellow wire between ECU terminal A11 and EACV.

6. If no battery voltage existed in step 5), measure voltage between ground and Black/Yellow wire terminal. If battery voltage now exists, proceed to step 7). If battery voltage still does not exist, repair open Black/Yellow wire between fuse No. 14 and EACV.

7. If battery voltage exists, turn ignition off. Reconnect EACV connector. Connect ECU test harness connector "A" to main wire harness side only. Turn ignition on. Using a voltmeter, measure voltage between connector terminals A11 (pos.) And A2 (neg.). If battery voltage does not exist, repair open in wire between ECU terminal A11 and EACV.

8. If battery voltage exists, connect and disconnect terminal A11 to A2. If EACV does not click when connector is connected and disconnected, replace EACV. If EAVC clicks, substitute a known good ECU. If condition is rectified, replace original ECU.

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