Compression
Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer manual for specific instructions.
| WARNING | DO NOT use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate the engine's oiling system. |
| Application (1) | Psi (kg/cm 2 ) |
|---|
| Compression Pressure | 170-225 (11.7-15.5) |
| Maximum Variation Between Cylinders (2) | 14 (1.0) |
| (1) See ENGINE/VIN ID article for VIN information. (2) On 2.0L non-turbo engine, maximum variation between cylinders is 25 percent. |
| (1) | See ENGINE/VIN ID article for VIN information. |
| (2) | On 2.0L non-turbo engine, maximum variation between cylinders is 25 percent. |
COMPRESSION SPECIFICATIONS
Exhaust System Backpressure
Exhaust system can be checked with a vacuum or pressure gauge. Remove oxygen sensor 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 1 3/4 - 2 psi, exhaust system or catalytic converter is plugged.
If using a vacuum gauge, connect vacuum gauge hose to intake manifold vacuum port and start engine. Observe vacuum gauge. Open throttle part way and hold steady. If vacuum gauge reading slowly drops after stabilizing, exhaust system should be checked for a restriction.
FUEL SYSTEM
| WARNING | ALWAYS relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. |
Relieving Fuel Pressure
- Remove rear seat cushion and remove access plate if required to disconnect fuel pump harness connector.
- Start engine. Let engine run until it stops. Turn ignition off. Disconnect negative battery cable. Connect fuel pump harness connector. Reinstall rear seat (if necessary.)
| WARNING | Before disconnecting high pressure fuel hose at fuel delivery pipe, cover fuel hose connection with a rag. Some residual fuel pressure may still be in system. |
Scheme 71
Scheme 71: Pressure Testing
- Disconnect high pressure fuel hose at fuel delivery pipe. Remove throttle body bracket (if necessary). Connect fuel pressure gauge with adapter between fuel delivery pipe and high pressure hose. (Scheme 71)
- Connect negative battery cable. Operate fuel pump by connecting battery voltage to fuel pump test terminal. See «FUEL PUMP TEST TERMINAL LOCATION»(ref-19189-S31294910782000123000000) table. Ensure no fuel leaks are present. Disconnect battery voltage from fuel pump test terminal. FUEL PUMP TEST TERMINAL LOCATION Application Wire Color Location Eclipse Black/Blue (1) (1) On main wiring harness, near wiper motor on firewall, behind battery.
- Start engine and allow it to idle. Measure fuel pressure with vacuum hose connected to fuel pressure regulator. Record fuel pressure reading. See «FUEL PUMP PERFORMANCE»(ref-19189-S00280883492000123000000) table. Disconnect and plug vacuum hose from fuel pressure regulator. Record fuel pressure reading.
- Check for fuel pressure in fuel return hose by gently pinching hose while increasing engine speed. If fuel volume is low, fuel pressure in return hose will not be felt. Increase engine speed to 2500-3000 RPM, 2-3 times. Return engine to idle. Fuel pressure should not drop when engine is returned to idle.
- Turn ignition off. Ensure fuel pressure reading does not decrease within 2 minutes. If a decrease is noted, monitor speed of decrease.
- If fuel pressure is lower than specification, fuel pressure drops at idle after increasing engine speed to 2500-3000 RPM, or no fuel pressure in fuel return hose can be felt, check for clogged fuel filter, or faulty fuel pressure regulator or fuel pump.
- If fuel pressure is greater than specification, check for a faulty fuel pressure regulator or plugged fuel return line. If fuel pressure does not change when vacuum hose to regulator is connected or disconnected, check for a leaking or clogged vacuum hose to fuel pressure regulator or faulty fuel pressure regulator.
- If fuel pressure decreases suddenly after engine is stopped, check valve in fuel pump is not seated. Replace fuel pump. If fuel pressure drops slowly, fuel injector is leaking or fuel pressure regulator valve seat is leaking. Check for faulty fuel injector or fuel pressure regulator. Repair as necessary.
- When fuel pressure test is complete, repeat fuel pressure release procedure before disconnecting fuel pressure gauge. Install NEW "O" ring at end of high pressure hose. Check for fuel leaks.
| Application | At Idle (1) W/Vacuum psi (kg/cm 2 ) | At Idle (2) W/O Vacuum psi (kg/cm 2 ) |
|---|
| 2.0L Non-Turbo | (3) | 47-50 (3.3-3.5) |
| (1) With vacuum at pressure regulator. (2) Without vacuum at pressure regulator. (3) Information is not available from manufacturer. |
| (1) | With vacuum at pressure regulator. |
| (2) | Without vacuum at pressure regulator. |
| (3) | Information is not available from manufacturer. |
MFI Control Relay
Multipurpose relay switches power to vehicle sensors and actuators including Volume Airflow (VAF) sensor, crankshaft position sensor, idle speed control, injectors and fuel pump. When ignition switch is turned to ON position, PCM energizes coils controlling injectors, VAF sensor and idle air control. When ignition switch is turned to START position, PCM energizes coils (through park/neutral position switch on A/T models) to supply power to fuel pump. Relay failure will cause a no-start condition. For testing procedure, see SYSTEM/COMPONENT TESTS - 2.0L NON-TURBO article.
IGNITION CHECKS
Note. Perform all circuit tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.
SPARK
Check for spark at coil wire (if applicable) and at each spark plug wire using a high output spark tester. Check spark plug wire resistance on suspect wires. Wire resistance should not exceed 8 k/ohms.
CAMSHAFT POSITION (CMP) SENSOR
For CMP sensor testing procedure, see TESTS W/CODES - 2.0L NON-TURBO article.
CRANKSHAFT POSITION (CKP) SENSOR
For CKP sensor testing procedure, see TESTS W/CODES - 2.0L NON-TURBO article.
Scheme 72
Scheme 72: Ignition Coil Resistance
- Disconnect ignition coil connector. Using a Digital Volt-Ohmmeter (DVOM), measure primary coil resistance between center and right terminal of coil (for cylinders No. 1 and 4) and center and left terminal of coil (for cylinders No. 2 and 3).
- Remove ignition wires from coil. Measure secondary coil resistance between coil towers for cylinders No. 1 and 4 and between coil towers for cylinders No. 2 and 3. Primary and secondary coil resistance should be within specification. See «IGNITION COIL RESISTANCE»(ref-19189-S04781790172000123000000) table. Connect coil harness connector. Connect ignition wires to coil. IGNITION COIL RESISTANCE - Ohms @ 68°F (20°C) Application Primary Secondary Non-Turbo .51-.61 11,500-13,500
IDLE SPEED & IGNITION TIMING
Ensure idle speed and ignition timing are set to specification. See IGNITION TIMING SPECIFICATIONS table. For adjustment procedures, see ADJUSTMENTS - 2.0L NON-TURBO article.
| Application | (1) Basic | (2) (3) Actual |
|---|
| 2.0L Non-Turbo | (4) | (4) |
| (1) With ignition timing adjustment connector grounded or vacuum hose (farthest from distributor) disconnected. (2) With ignition timing adjustment connector ungrounded or vacuum hose (farthest from distributor) connected. Actual ignition timing is approximate and may fluctuate 5-7 degrees. (3) If vehicle altitude is more than 2300 feet above sea level, actual timing may be advanced (5 degrees). (4) Ignition timing is NOT adjustable. |
| (1) | With ignition timing adjustment connector grounded or vacuum hose (farthest from distributor) disconnected. |
| (2) | With ignition timing adjustment connector ungrounded or vacuum hose (farthest from distributor) connected. Actual ignition timing is approximate and may fluctuate 5-7 degrees. |
| (3) | If vehicle altitude is more than 2300 feet above sea level, actual timing may be advanced (5 degrees). |
| (4) | Ignition timing is NOT adjustable. |
IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)
SUMMARY
If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed to TESTS W/CODES - 2.0L NON-TURBO article. If no hard codes are found in self-diagnostics, proceed to TESTS W/O CODES - 2.0L NON-TURBO article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.
