1998 2.4 L Mitsubishi

TRUMP88

MEMBER
1998 MITSUBISHI ECLIPSE
4 CYL
2WD
MANUAL
140,000 MILES

I have a 1998 mitsubishi 2.4L eclipse spyder convertable. The code I am getting from the scan monitor is P0505 which is the idle air control motor. The problem is the manual I have has the idle air control and the throttle position sensor resistance checks backwards I think. Can you give me the correct resistances for both of these units or steer me in the right direction.

1 Reply

KHLOW2008

MECHANIC
41,814 POSTS

Our database does not have any resistance test for the IAC.

DTC P0505: IDLE CONTROL SYSTEM MALFUNCTION

1. Ensure engine coolant temperature is less than 68°F (20°C). Using a stethoscope, listen for operating sound of Idle Air Control (IAC) motor when ignition switch is placed in ON position. If operating sound can be heard, go to next step. If no operating sound can be
heard on 2.4L, go to step 5). On turbo, go to step 4).

2. Disconnect IAC motor connector. Turn ignition on. Check voltage between ground and IAC motor connector terminal No. 2, and between ground and terminal No. 5. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring harness between MFI
relay and IAC motor connector.

3. Disconnect PCM connector. Turn ignition on. Check voltage between ground and PCM terminals No. 4, 5, 17 and 18. If battery voltage exists, check PCM connector. If PCM connector is okay, replace PCM. If battery voltage does not exist, go to next step.

4. Check IAC motor connector and wiring harness between PCM and IAC motor connector. If connector and wiring harness are okay, replace IAC motor.

5. Turn ignition off. Connect Test Harness (MB991348 ) between IAC motor and connector. Check voltage between ground and test harness terminals No. 2 and 4. Voltage should momentarily go from 1.5-4.0 volts to less than one volt or more than 4.5 volts right after ignition switch is turned on. If voltage is as specified on both circuits, replace PCM. If voltage is not as specified, go to next step.

6. Disconnect IAC motor connector. Check voltage between ground and IAC motor connector terminals No. 1, 2 and 4. Voltage should be 4.8-5.2 volts. Check continuity between ground and IAC motor connector terminal No. 3. Go to next step.

7. If voltage is as specified and continuity exists, check IAC motor connector. If IAC motor connector is okay, replace IAC motor on Eclipse or valve position sensor on Galant. If voltage is not as specified or continuity does not exist, check IAC motor connector and wiring harness between PCM and IAC motor connector. If connector and wiring are okay, replace PCM.

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