Engine Controls - Basic Testing: Other Saab 9000 I рестайлинг

Compression

Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. See engine analyzer instruction manual for specific instructions.

Check engine compression at normal operating temperature with all spark plugs removed. To prevent damage to catalytic converter, make tests quickly and only when necessary.

ENGINE COMPRESSION (1)

Exhaust System Backpressure

The exhaust system can be checked with a vacuum or pressure gauge. Remove O2 sensor. Connect a 0-10 psi gauge and run engine at 2500 RPM. If exhaust system backpressure is greater than 2 psi (.14 kg/cm 2 ), exhaust system or catalytic converter is plugged.

If a vacuum gauge is used, connect it to intake manifold vacuum port and start engine. Observe vacuum gauge. Open throttle part way and hold steady. If vacuum gauge slowly drops after stabilizing, exhaust system should be checked for a restriction.

FUEL PRESSURE

Basic diagnosis of fuel system should begin with determining fuel system pressure.

1. Turn ignition off. Disconnect banjo coupling at inlet to fuel injection manifold. Connect a fuel pressure gauge using existing seals. Ensure pressure gauge hangs vertically.
2. Remove fuse No. 30 on 900 models. Remove fuse No. 14 from 9000 models. Connect a jumper lead between fuse No. 27, 28, or 29 and slot of fuse No. 30 for 900 models. Connect the jumper between fuse No. 22 and slot of fuse No. 14 on 9000 models. This will provide current to the fuel pump. Turn ignition on.
3. Fuel pressure should increase to approximately 36 psi (2.5 kg/cm 2 ). If fuel pressure is too high, go to next step. If fuel pressure is too low, go to step 5).
4. Turn ignition off. Disconnect fuel return line from pressure regulator and blow through line. If line is open, pressure regulator is defective and should be replaced. If line is blocked, remove blockage or replace with a new return line. Check one-way valve at tank and retest system.
5. Check fuel level; do not rely on fuel gauge. Check for fuel system leaks. Check fuel pressure regulator. See «FUEL PRESSURE REGULATOR»(ref-15378-S14930132872001010800000) test. If proceeding to FUEL PRESSURE REGULATOR test, do not remove fuel pressure gauge.

Fuel Pressure Regulator

1. If fuel pressure gauge is already attached, go to next step. If not, disconnect banjo coupling at inlet to fuel injection manifold. Connect fuel pressure gauge at this point, using existing seals. Ensure pressure gauge hangs vertically.
2. Connect Pressure Gauge (83 93 514 ), with "Y" connection, to vacuum port of fuel pressure regulator. Hang pressure gauge vertically. Connect cooling system pressure tester to "Y" connection.
3. Turn ignition off. Remove fuse No. 30 on 900 models. Remove fuses No. 14 and No. 22 from 9000 models. Connect a jumper lead between fuse No. 27, 28, or 29 and slot of fuse No. 30 for 900 models. Connect the jumper between fuse No. 22 and slot of fuse No. 14 on 9000 models. This will provide current to fuel pump. Turn ignition on.
4. Fuel pressure should increase to approximately 36 psi (2.5 kg/cm 2 ). Using a cooling system pressure tester, increase system pressure as specified in «APPLIED PRESSURE REGULATOR SPECIFICATIONS»(ref-15378-S40607436912001010800000) table, and compare fuel pressure to specification.
5. Remove cooling system pressure tester. Install vacuum pump to "Y" connection. Fuel pressure should be approximately 36 psi (2.5 kg/cm 2 ). Use vacuum pump to reduce system pressures as specified in «APPLIED VACUUM REGULATOR SPECIFICATIONS»(ref-15378-S26641814482001010800000) table, and compare fuel pressure to specification. Disconnect vacuum pump.
6. Turn ignition on to operate fuel pump. Verify fuel pressure of 36 psi (2.5 kg/cm 2 ). Turn ignition off. Pressure should drop 1.4-2.8 psi (.1-.2 kg/cm 2 ), and then hold steady for at least 10 minutes.
7. If pressure drops more than specified, check for leakage in pressure regulator and fuel pump non-return valve. APPLIED PRESSURE REGULATOR SPECIFICATIONS Applied Pressure psi (kg/cm 2 ) Fuel Pressure psi (kg/cm 2 ) 0 (0) 36.3 (2.5) 2.9 (.2) 39.2 (2.7) 5.8 (.4) 42.1 (2.9) 8.6 (.6) 44.9 (3.1) APPLIED VACUUM REGULATOR SPECIFICATIONS Applied Vacuum In. Hg Fuel Pressure psi (kg/cm 2 ) 0 36.3 (2.5) 5 33.4 (2.3) 11 30.5 (2.1) 16 27.5 (1.9)

Fuel Pump Delivery Pressure

1. Turn ignition off. Disconnect banjo coupling at inlet to fuel injection manifold. Connect a fuel pressure gauge using existing seals. Ensure pressure gauge hangs vertically. Turn ignition on. Pinch off fuel return line and check fuel pressure. When line is plugged, there should be an immediate increase in fuel pressure. CAUTION: DO NOT allow pressure to rise above 83 psi (5.8 kg/cm 2 ).
2. If fuel pressure does not increase, check for the following problems: At least 11.5 volts across fuel pump terminals Obstructed fuel lines Clogged fuel filter Fuel filter installed backward Defective relief valve in fuel pump NOTE: If fuel filter has been installed backward, it must be replaced.
3. After checking fuel pump pressure, turn ignition off. Go to «FUEL PUMP DELIVERY FLOW»(ref-15378-S35726718752001010800000) test procedure (do not disconnect pressure gauge).

Fuel Pump Delivery Flow

1. Turn ignition off. Disconnect fuel return line at pressure regulator. Connect a section of test hose to return line at pressure regulator. Place other end of test hose in graduated container of about 2 quarts.
2. Activate fuel pump by turning ignition on. Run fuel pump for 30 seconds. Check volume of fuel flow and fuel pressure drop. Minimum acceptable volume is .95 qt. (.9 L), and maximum allowed fuel pressure drop is 1.4-2.8 psi (.1-.2 kg/cm 2 ). If fuel volume or pressure drop does not meet specification, replace fuel pressure regulator.

Fuel Pump Relay

1. Remove relay. Relay is located on passenger side kick panel on 900 Series; behind glove box on 9000 Series.
2. Connect ohmmeter across relay contact terminals (Red and Green/Red wires on mating connector). Ohmmeter should indicate no continuity.
3. Connect 12 volts across relay coil (Brown/Violet and Violet wires on 900 Series; Green/White and Violet wires on 9000 Series). Ohmmeter should indicate continuity.

Quick Check

1. Measure voltage at Red wire going into ignition cartridge. With ignition on, voltmeter should indicate battery voltage.
2. Turn ignition off. Remove No. 14 fuse (fuel pump). Remove ignition cartridge and spark plugs. Install spark plugs into ignition cartridge. Using jumper wires, connect negative electrodes of spark plugs together. Ground other ends of jumper wires.
3. With ignition key, crank engine and observe tachometer. Needle of tachometer should hunt. Ensure there is spark at all spark plugs. Release ignition key to RUN position for approximately 5 seconds. Ensure tachometer needle hunts and multiple sparks occur at spark plugs.

Ignition Coil Power Source

Turn ignition on. Using voltmeter, check voltage between Green/White wire at ignition coil and ground at ignition coil harness connector. Battery voltage should exist.

Ignition Coil Resistance

1. Turn ignition switch off. Remove primary and secondary leads from ignition coil. Using ohmmeter, check primary resistance between positive and negative terminals of coil. Resistance should be as specified. See «IGNITION COIL RESISTANCE»(ref-15378-S31162962132001010800000) table.
2. Check secondary resistance between tower and negative terminal of coil. See «IGNITION COIL RESISTANCE»(ref-15378-S31162962132001010800000) table. Replace coil if readings are not within specification. IGNITION COIL RESISTANCE - Ohms@68°F (20°C) Application Primary Secondary 900 Series .52-.76 7200-8200 9000 Series (1) (1) (1) DIS coil specifications not available from manufacturer. NOTE: All voltage tests should be performed with a Digital Volt Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless specifically stated different in testing procedures.

Hall Effect Sensor

1. Make all checks at the back of electrical connectors for EZK Electronic Control Unit (ECU) with ignition on.
2. To test sensor supply voltage, connect voltmeter between terminal No. 10 and 4 of ECU. See «WIRING DIAGRAMS»(ref-15386) article. Voltmeter reading should be battery voltage.
3. To test signal from Hall Effect sensor to ECU, connect voltmeter between terminals No. 10 and 24 of ECU. See «WIRING DIAGRAMS»(ref-15386) article. Slowly turn engine by hand. Voltmeter indication should vary from 0.4-3.0 volts as Hall Effect sensor shutter opens and closes.

PROGRAMMING ECU

Note. If the power supply to the ECU has been interrupted, the system must be reprogrammed.

9000 Series

To program system, accelerate vehicle at full throttle from 2000-4500 RPM. Because programming occurs at 2750-4500 RPM and requires 3 seconds to complete, the procedure should be performed in a gear that permits operation between those engine speeds.

900 Series

Drive vehicle for 10 minutes with engine at normal operating temperature.

IDLE SPEED & IGNITION TIMING

Ensure idle speed and ignition timing are set to specification. For adjustment procedures, see ADJUSTMENTS article in the ENGINE PERFORMANCE Section.

SUMMARY

If no faults were found while performing BASIC TESTING , proceed to G - TESTS W/ CODES article in the ENGINE PERFORMANCE Section. If no hard codes are found in self-diagnostics, or vehicle does not have a self-diagnostic system, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.