2002 Hyundai Elantra DTC P1505 AND P1507

TOYOTAP

MEMBER
2002 HYUNDAI ELANTRA
4 CYL
FWD
AUTOMATIC
78,000 MILES

WHEN THE CAR CAME INTO THE SHOP IT WAS MISFIRING AND STALLING OUT IT HAD A P0506 IDLE AIR CONTROL SYSTEM LOWER THEN EXPECTED. PLUGS AND WIRES WERE ARCING OUT AND SUSPECTED IAC VALVE WAS MALFUNCTIONING
REPLACED PLUGS AND WIRES AND IAC VALVE CAR RAN GREAT FOR A COUPLE OF HOURS BUT WHEN CUSTOMER CAME TO PICK UP CAR IT WAS IDLING REALLY ROUGH AND STALLING AND ENGINE LIGHT WAS ON SCANNED IT AND FOUND P1505 AND 1507 IN IT NOT SURE WHERE TO GO FROM HERE

2 Replies

DERICKPMCNX

MEMBER
1 POST

Common for intake gaskets to blow out. Able to hear air leak. Spray brake clean along where intake fastens to cylinder head, that will tell you if there is a leak there.

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Friday, November 11th, 2011 AT 5:22 AM

RIVERMIKERAT

MECHANIC
6,110 POSTS

The codes mean Idle Charge Actuator Low Signal for both coils.

DTC P1505, DTC P1506, DTC P1507 OR DTC P1508
Code Definition
� DTC P1505: Idle Speed Actuator Closing Coil Signal Low (Coil No. 1)
� DTC P1506: Idle Speed Actuator Closing Coil Signal High (Coil No. 1)
� DTC P1507: Idle Speed Actuator Closing Coil Signal Low (Coil No. 2)
� DTC P1508: Idle Speed Actuator Closing Coil Signal High (Coil No. 2)
NOTE: ISC actuator has an opening coil and a closing coil. Each coil is driven
by a separate ECM driver which is used to set actuator into various
open and closed positions. ISC actuator is installed in throttle valve bypass
hose.
Failure Conditions
ECM will determine fault exists, sets DTC P1505 or P1506 and turn on the MIL when ECM
determines ISC actuator opening coil circuit is shorted to power during 2 driving cycles.
ECM will determine fault exists, sets DTC P1507 or P1508 and turn on the MIL when ECM
determines ISC actuator closing coil circuit is shorted to power during 2 driving cycles.
Probable Cause
� Open or short to ground between ECM and ISC actuator.
� Short to voltage between ECM and ISC actuator.
� Faulty ISC actuator.
Test Procedure
Turn ignition off. Disconnect ISC actuator 3-pin connector. Turn ignition on. Measure voltage
between ground and ISC actuator connector terminal No. 2 (White wire). If battery voltage
exists, go to next step. If battery voltage does not exist, repair open in White wire between
engine room fuse/relay box 10-amp (SNSR) fuse and ISC actuator. When repairs are
completed, clear DTC and verify system operation.
1.
Turn ignition on. Measure voltage between ground and ISC actuator connector terminal No. 1
(Gray wire). If voltage is less than 0.5 volt, go to next step. If voltage is not 0.5 volt or less,
repair Gray wire between ISC actuator connector terminal No. 1 and ECM connector terminal
No. 78. When repairs are completed, go to next step.
2.
Turn ignition on. Measure voltage between ground and ISC actuator connector terminal No. 3
(Green wire). If voltage is less than 0.5 volt, go to next step. If voltage is not 0.5 volt or less,
repair Green wire between ISC actuator connector terminal No. 3 and ECM connector terminal
No. 80. When repairs are completed, clear DTC and verify system operation.
3.
Turn ignition off. Measure resistance between ISC actuator terminals No. 1 and 2 (component
side), and between ISC actuator connector terminals No. 2 and 3 (component side). Resistance
should be 10-14 ohms at 68°F (20°C). If resistance is not as specified, replace ISC actuator. If
4.
ENGINE CONTROLS - SELF-DIAGNOSTICS -2002 Hyundai Elantra GT Page 1 of 2
11/21/2011
resistance is as specified, ensure ECM connector terminals are clean and tight. If connector and
terminals are okay, replace ISC actuator. Clear DTC and verify system operation. If problem
persists, replace ECM. When repairs are completed, clear DTC and verify system operation.