Ground Circuits
- Turn ignition off. Using a DVOM, check continuity between chassis ground and ECM ground terminals. See GROUND TERMINAL IDENTIFICATION table. DVOM should indicate zero ohms. If resistance is not as specified, check and repair circuit between ECM and ground.
- Connect voltmeter negative lead to chassis ground. Connect positive lead to each ECM ground terminal. See GROUND TERMINAL IDENTIFICATION table. With engine running, voltmeter should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, corrosion or loose connection in ground circuit.
Power Circuits
Turn ignition on. Check for battery voltage at ECM power terminals. See POWER TERMINAL IDENTIFICATION table. If battery voltage is not present, check operation of SFI control relay. See RELAYS.
| Application | ECM Terminals No. (1) |
|---|---|
| Accent | 28 & 55 |
| (1) (Scheme 10) | |
| (1) | (Scheme 10) |
GROUND TERMINAL IDENTIFICATION
| Application | ECM Terminals No. (1) |
|---|---|
| Accent | 25, 52 & 58 |
| (1) (Scheme 10) | |
| (1) | (Scheme 10) |
POWER TERMINAL IDENTIFICATION
Scheme 10
A/C SWITCH CIRCUITS
Disconnect ECM harness connector. Turn ignition and A/C switches to ON position. Using a DVOM, check voltage to A/C switch at ECM connector terminals. See appropriate wiring diagram in WIRING DIAGRAMS section. If battery voltage is present, circuit is okay. If battery voltage is not present, repair affected circuit and retest.
ACCELERATION/ROUGH ROAD SENSOR
See appropriate TESTS W/CODES article.
BAROMETRIC (BARO) PRESSURE SENSOR
See appropriate TESTS W/CODES article.
CAMSHAFT POSITION (CMP) SENSOR
See appropriate TESTS W/CODES article.
CRANKSHAFT POSITION (CKP) SENSOR
See appropriate TESTS W/CODES article.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
See appropriate TESTS W/CODES article.
HEATED OXYGEN SENSOR (HO2S)
See appropriate TESTS W/CODES article.
INTAKE AIR TEMPERATURE (IAT) SENSOR
See appropriate TESTS W/CODES article.
IDLE SPEED CONTROL (ISC) ACTUATOR
See appropriate TESTS W/CODES article.
KNOCK SENSOR (KS)
See appropriate TESTS W/CODES article.
MASS AIRFLOW (MAF) SENSOR
See appropriate TESTS W/CODES article.
THROTTLE POSITION (TP) SENSOR
See appropriate TESTS W/CODES article.
TRANSAXLE RANGE SWITCH (A/T MODELS)
- Transaxle Range (TR) switch is mounted to transaxle, near shift lever mechanism. Ensure switch is adjusted properly. Switch output can be affected by improper adjustment. Check power supply voltage to switch. Disconnect ECM and TR switch harness connectors. Turn ignition switch to START position.
- Check voltage between vehicle ground and TR switch harness connector terminal No. 3. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-16577-S11407167402000122900000) section. Battery voltage should be present. If battery voltage is not present, inspect and repair power supply circuit.
- Turn ignition off. Disconnect ECM harness connector. Turn ignition switch to START position. Check TR switch input voltage. Voltage reading should be 8 volts or greater. If voltage reading is as specified, check control cable adjustment or for faulty TR switch. Repair or replace as necessary. If voltage reading is not as specified, check input supply voltage circuit.
VEHICLE SPEED SENSOR (VSS)
See appropriate TESTS W/CODES article.
VOLUME AIRFLOW (VAF) SENSOR (3.0L)
See appropriate TESTS W/CODES article.
RELAYS
Note. SFI control relay may also be referred to as the ECM main relay.
| CAUTION | When applying direct battery voltage, ensure voltage is applied to correct terminal; otherwise, relay damage could result. |
SFI CONTROL RELAY
- Relay is located behind left side of dash. Disconnect relay harness connector and remove relay from holder. Apply battery voltage to terminal No. 4 (positive) and ground terminal No. 2 (negative). (Scheme 11)
- Using a DVOM, check for continuity between terminal No. 1 and terminal No. 5. Continuity should be present. Check for continuity between terminal No. 5 and terminal No. 3. Replace relay if continuity is not present for both checks.
- Disconnect relay harness connector. Using DVOM, check voltage between relay harness connector terminals No. 4 and 5 and vehicle ground. If battery voltage is not present on both terminals, inspect and repair circuit. See appropriate wiring diagram in «WIRING DIAGRAMS»(ref-16577-S11407167402000122900000) section.
- Ensure ignition is off. Disconnect ECM harness connector. Connect jumper wire between ECM terminal No. 27 and vehicle ground. (Scheme 10) Using ohmmeter, check resistance between relay harness connector terminal No. 2 and vehicle ground. Continuity should be present. If continuity is not present, inspect and repair circuit as needed.
Scheme 11
POWER TRANSISTOR
See BASIC TESTING article.
FUEL DELIVERY
Note. For fuel system pressure testing, see BASIC TESTING article.
Fuel Pump
See appropriate TESTS W/CODES article.
Fuel Injectors
See appropriate TESTS W/CODES article.
IDLE CONTROL SYSTEM
Note. For Idle Speed Control (ISC) actuator testing information, see appropriate TESTS W/CODES article.
IGNITION SYSTEM
Note. For basic ignition checks, see BASIC TESTING article.
EGR Valve
Remove valve and inspect for carbon deposits. Ensure valve is not sticking. Apply vacuum to valve and check for leaking diaphragm. Check airflow through valve.
FUEL EVAPORATION
Note. For further EVAP system testing, see appropriate DTC in TESTS W/CODES article.
Purge Control Solenoid Valve
- Disconnect vacuum hose and harness connector from purge control solenoid valve. Connect vacuum pump purge control solenoid. Apply vacuum and battery voltage and ground to solenoid. With battery voltage applied, vacuum should release. With battery voltage disconnected, vacuum should hold.
- Using an ohmmeter, measure resistance between solenoid valve terminals. At 68°F (20°C), resistance should be 26 ohms.
PCV Valve
Remove PCV valve. Plunger should rattle freely when valve is shaken. Ensure air flows freely when blown through cylinder head side of PCV valve. Ensure air flows with difficulty when blown through intake manifold side of PCV valve.
