Engine Controls - Basic Diagnostic Procedures: Other Kia Sephia II

Compression

Ensure battery is fully charged. Disconnect ignition coils. Check engine compression with engine at normal operating temperature at specified cranking speed, all spark plugs removed, and throttle wide open. See COMPRESSION SPECIFICATIONS table.

COMPRESSION SPECIFICATIONS

Exhaust System Backpressure

The exhaust system can be tested with a vacuum or pressure gauge. If using a pressure gauge, remove HO2S or air injection check valve (if equipped). Connect a 0-5 psi pressure gauge and run engine at 2500 RPM. If exhaust system backpressure is greater than 2 psi, exhaust system or catalytic converter is plugged.

If using a vacuum gauge, connect vacuum gauge hose to intake manifold vacuum port. Start engine. Observe vacuum gauge. Open throttle part way and hold steady. If vacuum gauge indication slowly drops after stabilizing, inspect exhaust system for restriction.

FUEL PRESSURE RELEASE

To release fuel pressure, remove rear seat cushion. Start engine. Disconnect fuel pump electrical connector. Run engine until it stalls. Turn ignition off. When testing or repair is complete, reconnect fuel pump connector and install rear seat cushion. Then prime fuel system. See PRIMING FUEL SYSTEM .

PRIMING FUEL SYSTEM

After performing any operation that requires releasing fuel pressure, fuel system should be primed to prevent long cranking times. To prime fuel system, jumper Data Link Connector (DLC) terminals FUEL PUMP and B+. DLC is located left side of engine compartment. (Scheme 1) Turn ignition on for no longer than 10 seconds to run pump and pressurize fuel system. Turn ignition off and remove jumper wire.

Scheme 1

FUEL PRESSURE

Fuel Pressure (Sephia)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3154-S27694842002000041800000). Disconnect battery negative cable. Install Fuel Pressure Gauge (0K2A1 131 001) on service port at center of fuel rail.
2. Connect battery negative cable. Jumper Data Link Connector (DLC) terminals FUEL PUMP and B+. DLC is located left side of engine compartment. (Scheme 1)
3. Turn ignition on for 10 seconds or less. Check fuel pressure. See «FUEL PRESSURE SPECIFICATIONS»(ref-3154-S15714083812000041800000) table. Turn ignition off and remove jumper wire.
4. If fuel pressure is too high, check for restricted return line. If return line is open, replace pressure regulator.
5. If fuel pressure is too low, block return line. Run fuel pump again and see if pressure rises. If pressure rises, replace pressure regulator. If pressure does not rise, check fuel pump maximum pressure. See «MAXIMUM FUEL PRESSURE (SEPHIA)»(ref-3154-S16632556232000041800000) test.

FUEL PRESSURE SPECIFICATIONS

Fuel Pressure (Sportage)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3154-S27694842002000041800000) . Disconnect battery negative cable. Install fuel pressure gauge on service port at front of fuel rail. Connect battery negative cable.
2. Start engine and allow it to idle. Check fuel pressure. Disconnect vacuum hose from pressure regulator and check fuel pressure again. See «FUEL PRESSURE SPECIFICATIONS»(ref-3154-S15714083812000041800000) table.

Fuel Line Pressure (Sportage)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3154-S27694842002000041800000). Disconnect battery negative cable. Install fuel pressure gauge on service port at front of fuel rail. Connect battery negative cable.
2. Jumper Data Link Connector (DLC) terminals FUEL PUMP and B+. DLC is located left side of engine compartment. (Scheme 1) Turn ignition on for about 10 seconds. Check fuel pressure. See «FUEL PRESSURE SPECIFICATIONS»(ref-3154-S15714083812000041800000) table.
3. If pressure is not as specified, check fuel line and filter for restrictions. Check fuel pump maximum pressure and pressure regulator hold pressure. See «MAXIMUM FUEL PRESSURE (SPORTAGE)»(ref-3154-S24865130572000041800000) and «PRESSURE REGULATOR HOLD PRESSURE (SPORTAGE)»(ref-3154-S11382082492000041800000). Also see «REGULATED FUEL PRESSURE (SPORTAGE)»(ref-3154-S30325975352000041800000) test.

Pressure Regulator Hold Pressure (Sportage)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3154-S27694842002000041800000). Disconnect battery negative cable. Install fuel pressure gauge on service port at front of fuel rail. Connect battery negative cable.
2. Jumper Data Link Connector (DLC) terminals FUEL PUMP and B+. DLC is located left side of engine compartment. (Scheme 1) Turn ignition on for 10 seconds or less. Turn ignition off.
3. Pinch fuel return hose at pressure regulator with pliers. Observe fuel pressure for 5 minutes. It should stay above specified pressure. See «FUEL PRESSURE SPECIFICATIONS»(ref-3154-S15714083812000041800000) table. If pressure drops below specification, replace pressure regulator.

Holding Fuel Pressure

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3154-S27694842002000041800000). Disconnect battery negative cable. Install fuel pressure gauge on service port at fuel rail. Connect battery negative cable.
2. Jumper Data Link Connector (DLC) terminals FUEL PUMP and B+. DLC is located left side of engine compartment. (Scheme 1) Turn ignition on for 10 seconds or less to operate fuel pump and pressurize system. Turn ignition off and remove jumper wire.
3. On Sephia, check fuel pressure after 15 minutes and compare to specification. On Sportage, check fuel pressure after 5 minutes and compare to specification. See «FUEL PRESSURE SPECIFICATIONS»(ref-3154-S15714083812000041800000) table. If pressure is not as specified, check fuel pump, pressure regulator and injectors. On Sportage, also see «PRESSURE REGULATOR HOLD PRESSURE (SPORTAGE)»(ref-3154-S11382082492000041800000) test.

Maximum Fuel Pressure (Sephia)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3154-S27694842002000041800000). Disconnect battery negative cable. Remove rear seat cushion. Connect Fuel Pressure Gauge (0K2A1 131 001) to main fuel line. Connect battery negative cable.
2. Jumper Data Link Connector (DLC) terminals FUEL PUMP and B+. DLC is located left side of engine compartment. (Scheme 1) Turn ignition on. Check maximum fuel pressure. See «FUEL PRESSURE SPECIFICATIONS»(ref-3154-S15714083812000041800000) table. If fuel pressure is not as specified, replace fuel delivery module. See FUEL DELIVERY MODULE (SEPHIA) under FUEL PUMP in REMOVAL, OVERHAUL & INSTALLATION article.

Maximum Fuel Pressure (Sportage)

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-3154-S27694842002000041800000). Disconnect battery negative cable. Connect fuel pressure gauge to fuel filter and plug outlet of gauge. Connect battery negative cable.
2. Jumper Data Link Connector (DLC) terminals FUEL PUMP and B+. DLC is located left side of engine compartment. (Scheme 1) Turn ignition on. Measure maximum fuel pressure. See «FUEL PRESSURE SPECIFICATIONS»(ref-3154-S15714083812000041800000) table. Turn ignition off and remove jumper wire. If pressure is not as specified, replace fuel pump. See FUEL PUMP (SPORTAGE) under FUEL PUMP in REMOVAL, OVERHAUL & INSTALLATION article.

Fuel Pump Relay (Sephia)

1. Remove relay from engine compartment fuse/relay box. Check for continuity between relay terminals No. 1 and 3. (Scheme 2) If continuity does not exist, go to next step. If continuity exists, replace relay.
2. Connect a jumper wire between positive battery terminal and relay terminal No. 2. Connect another jumper wire between negative battery terminal and relay terminal No. 4.
3. Check continuity between relay terminals No. 1 and 3. Continuity should exist. If continuity does not exist, replace relay.

Scheme 2

Fuel Pump Relay (Sportage)

1. Remove relay from engine compartment fuse/relay box. Check for continuity between relay terminal No. 2 and terminals No. 3 and 4. (Scheme 3) If continuity does not exist, go to next step. If continuity exists, replace relay.
2. Connect a jumper wire between positive battery terminal and relay terminal No. 5. Connect another jumper wire between negative battery terminal and relay terminal No. 1.
3. Check continuity between relay terminal No. 2 and terminals No. 3 and 4. Continuity should exist. If continuity does not exist, replace relay.

Scheme 3

SPARK

Check for spark at each spark plug wire using a high output spark tester. Check spark plug wire resistance on suspect wires. High tension wire resistance should not exceed 16,000 ohms per 3.3 feet.

IGNITION COIL POWER SOURCE

Disconnect ignition coil connectors. Turn ignition on. On Sephia, measure voltage between positive (+) terminal (Yellow wire) of each ignition coil connector and ground. On Sportage, measure voltage between positive (+) terminal (White/Red wire) of each ignition coil connector and ground. On all models, if battery voltage is not present, check battery feed circuit, main fuse, ignition switch and wiring harness.

IGNITION COIL RESISTANCE

1. Disconnect ignition coil connector. Using ohmmeter, check primary resistance between positive (+) and negative (-) terminal of coil. If reading is not.45-.55 ohm at 68°F (20°C), replace ignition coil. If reading is.45-.55 ohm, go to next step.
2. Check secondary resistance between coil towers for cylinders No. 2 and 3. (Scheme 4) Check resistance between coil towers for cylinders No. 1 and No. 4. If any reading is not 13,000-15,000 ohms at 68°F (20°C), replace ignition coil. If both readings are 13,000-15,000 ohms, coil is okay.

Scheme 4

IDLE SPEED & IGNITION TIMING

Ignition timing and base idle speed are computer controlled and nonadjustable. Ensure idle speed and base ignition timing are set to specification. Idle speed should be 750-850 RPM (Sephia) or 770-870 RPM (Sportage). Base ignition timing should be as indicated. See BASE IGNITION TIMING table. If idle speed is too high, correct that problem first. Check that air conditioning is off. Check for sources of undue mechanical, or electrical, loads on engine that may cause Engine Control Module (ECM) to raise idle speed. Check for intake air leaks. Check for rich condition that ECM may be trying to compensate for. If base idle speed is okay and ignition timing is not within specifications, check camshaft position sensor, crankshaft position sensor and wiring to ECM. Also check camshaft timing.

BASE IGNITION TIMING

SUMMARY

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to SELF-DIAGNOSTICS article. If no hard codes are found in self-diagnostics, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.