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1998 Kia Injector Problem

Tiny
MUSICMINER
  • MEMBER
  • 1998 KIA SEPHIA
  • 4 CYL
  • 2WD
  • MANUAL
  • 125,000 MILES
Having a problem with my 98 Kia Sephia. It runs great and idles fine from cold start, but after 10 minutes or so of warming up, at idle it will suddenly die. It will start right back up, but will die within a few seconds at idle. Goes down the road great, but will die anytime the rpms drop to idle range. It throw codes 0265, 0271, 0268 and 0262, showing all four injectors short to battery voltage simultaneously. TPS checked and Computer has been replaced with no change in behavior.
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Wednesday, March 30th, 2011 AT 9:37 PM

9 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
It indicates a fault with the injectors or a short to the wire circuits between the injectors and PCM. Since all four came up at the same time, the more likely cause would be a loose or contaminated connection between engine harness and PCM.

After erasing the codes, does they come back as soon as the engine is warmed up?
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Wednesday, March 30th, 2011 AT 10:31 PM
Tiny
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Restarting the engine immediately after erasing them, it will run fine unless let to drop to idle and will die again, flashing the same codes.
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Wednesday, March 30th, 2011 AT 10:46 PM
Tiny
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Start by checking the continuity of wires between the injectors and PCM. Look out for signs of contaminations and corrosion.

Was anything done prior to this occurring?
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Wednesday, March 30th, 2011 AT 11:26 PM
Tiny
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We cleaned the relay contact in the plug in fusebox under the hood, they were getting a bit corroded and the fuel pump was intermittent.
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Thursday, March 31st, 2011 AT 12:26 AM
Tiny
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Ok, I would suggest rechecking that area as well. Such wire couplers do cause such intermittent problems.
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Thursday, March 31st, 2011 AT 12:44 AM
Tiny
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We replaced the entire relay box, including all connectors, relays and fuses. No change except now it idles very erratically. Have now tried it with 3 different working ECU modules. It seems better at first then right back to the same problem.
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Thursday, July 7th, 2011 AT 1:22 AM
Tiny
KHLOW2008
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Are you still getting the same codes and is there any other additional codes?
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Thursday, July 7th, 2011 AT 11:17 AM
Tiny
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Exact same codes as before, no new ones.
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Friday, July 8th, 2011 AT 12:30 AM
Tiny
KHLOW2008
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Here are diagnostics procedures for the codes. See if you can come up with anything.

DTC P0262: FUEL INJECTOR NO. 1 CIRCUIT HIGH

Check for:

a)Short to power in Brown/Black wire between fuel injector and Engine Control Module (ECM).

B) Fuel injector No. 1 malfunction.

Procedure

1. Turn ignition off. Disconnect fuel injector No. 1 connector and ECM 88-pin connector. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 3 (Brown/Black wire). See Fig. 6. If voltage exists, repair short to power in Brown/Black wire between fuel injector No. 1 and ECM connector terminal No. 3. If voltage does not exist, go to next step.

2. Measure resistance between fuel injector No. 1 connector terminals component side). Fuel injector resistance should be 14-15 ohms at 68°F(20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, wiggle wiring between fuel injector and ECM while performing step 1) again. If source of intermittent is located, repair wiring as necessary.

DTC P0265: FUEL INJECTOR NO. 2 CIRCUIT HIGH

Check for:

a) Short to power in Brown/Green wire between fuel injector and Engine Control Module (ECM).

B) Fuel injector No. 2 malfunction.

Procedure

1. Turn ignition off. Disconnect fuel injector No. 2 connector and ECM 88-pin connector. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 32 (Brown/Green wire). See Fig. 6. If voltage exists, repair short to power in Brown/Green wire between fuel injector No. 2 and ECM connector terminal No. 32. If voltage does not exist, go to next step.

2. Measure resistance between fuel injector No. 2 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F
(20°C). If resistance is not as specified, replace fuel injector. If
resistance is as specified, wiggle wiring between fuel injector and ECM while performing step 1) again. If source of intermittent is located, repair wiring as necessary.

DTC P0268: FUEL INJECTOR NO. 3 CIRCUIT HIGH

Check for:

a) Short to power in Brown/Black wire between fuel injector and Engine Control Module (ECM).

B)Fuel injector No. 3 malfunction.

Procedure

1. Turn ignition off. Disconnect fuel injector No. 3 connector and ECM 88-pin connector. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 31 (Brown/Black wire). See Fig. 6. If voltage exists, repair short to power in Brown/Black wire between fuel injector No. 3 and ECM connector terminal No. 31. If voltage does not exist, go to next step.

2. Measure resistance between fuel injector No. 3 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, wiggle wiring between fuel injector and ECM while performing step 1) again. If source of intermittent is located, repair wiring as necessary.

DTC P0271: FUEL INJECTOR NO. 4 CIRCUIT HIGH

Check for:

a) Short to power in Brown/Yellow wire between fuel injector and Engine Control Module (ECM).

B) Fuel injector No. 4 malfunction.

Procedure

1. Turn ignition off. Disconnect fuel injector No. 4 connector and ECM 88-pin connector. Turn ignition on. Measure voltage between ground and ECM connector terminal No. 4 (Brown/Yellow wire). See Fig. 6. If voltage exists, repair short to power in Brown/Yellow wire between fuel injector No. 4 and ECM connector terminal No. 4. If voltage does not exist, go to next step.

2. Measure resistance between fuel injector No. 4 connector terminals (component side). Fuel injector resistance should be 14-15 ohms at 68°F (20°C). If resistance is not as specified, replace fuel injector. If resistance is as specified, wiggle wiring between fuel injector and ECM while performing step 1) again. If source of intermittent is located, repair wiring as necessary.
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Friday, July 8th, 2011 AT 12:48 PM

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