Engine Controls - Basic Testing: Other Kia Sephia I рестайлинг

Compression

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

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. Disconnect fuel pump connector. Start and run engine until it stalls. Turn ignition off. When testing or repair is complete, reconnect fuel pump connector and install rear seat cushion.

FUEL PRESSURE

Regulated Fuel Pressure

Release fuel pressure. See FUEL PRESSURE RELEASE . Install fuel pressure gauge between fuel filter and main fuel line. Start engine and allow it to idle. If fuel pressure is not as specified, check and repair fuel system as necessary. See REGULATED FUEL PRESSURE SPECIFICATIONS .

REGULATED FUEL PRESSURE SPECIFICATIONS

Maximum Fuel Pressure

1. Release fuel pressure. See «FUEL PRESSURE RELEASE»(ref-25093-S06338754932001010500000) . Connect fuel pressure gauge between main fuel line and fuel filter. Plug or pinch off fuel return hose.
2. Connect a jumper wire between ground and terminal F/P (Blue/Green wire) of Data Link Connector (DLC). DLC is located in center rear of engine compartment, in front of bulkhead. Turn ignition on.
3. Fuel pressure should be 70-95 psi (4.9-6.7 kg/cm 2 ). Turn engine off and disconnect jumper wire at DLC. Wait 5 minutes and ensure residual pressure is at least 21` psi (1.5 kg/cm 2 ).
4. If fuel pressure does not meet specifications, check fuel pump circuits, fuel pump, fuel tank and fuel filter. Repair or replace as necessary.

Fuel Pump Relay

1. Remove relay from vehicle. Relay is located next to PCM. Check for continuity between terminal No. 2 and terminal No. 3 at relay. If continuity does not exist, go to next step. If continuity exists, replace relay.
2. Connect a jumper wire between positive battery terminal and terminal No. 1 at relay. Connect another jumper wire between negative battery terminal and terminal No. 4 at relay.
3. Recheck continuity between terminals No. 2 and 3 at relay. If continuity exists, relay is okay. Testing is complete. If continuity does not exist, replace relay.

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

Turn ignition on. On 1.6L and 1.8L, measure voltage between ground and positive (+) terminal (Black/White wire) of coil connector. If battery voltage is not present, check battery feed circuit, main fuse, ignition switch and wiring harness.

Ignition Coil Resistance

1. Remove primary and secondary leads from ignition coil. Using ohmmeter, check primary resistance between positive (+) and negative (-) terminals of coil. (Scheme 2) If resistance is not.49-.73 ohms, replace ignition coil.
2. Check secondary resistance between positive (+) terminal and coil tower. (Scheme 3) If resistance is not 20,000-31,000 ohms, replace coil.

Scheme 2

Scheme 3

IDLE SPEED & IGNITION TIMING

Ensure idle speed and base ignition timing are set to specification. If necessary, see ADJUSTMENTS article. Idle speed should be 700-800 RPM (1.6L). Base ignition timing should be as indicated. See BASE IGNITION TIMING .

BASE IGNITION TIMING (DEGREES BTDC @ RPM)

SUMMARY

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