Engine Control System Testing & Engine Component Testing: Other Pontiac Bonneville X

AIR INDUCTION SYSTEMS

Note. Manufacturer does not provide testing procedures for many individual systems and components. For system and component testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

Note. For location of components, see COMPONENT LOCATIONS .

COMPUTERIZED ENGINE CONTROLS

Note. For location of components, see COMPONENT LOCATIONS .

PCM POWER & GROUND CHECK

Note. To identify circuits, see WIRING DIAGRAMS article.

Ground Circuits

1. Using DVOM, check for continuity to ground at PCM ground terminals. For connector terminal identification, see appropriate SELF-DIAGNOSTICS article. See WIRING DIAGRAMS article. Resistance should be less than 5 ohms. If resistance is not less than 5 ohms, repair open in ground circuit.
2. Connect negative lead of DVOM to a known-good ground. Backprobe positive lead of voltmeter to each PCM ground terminal. With vehicle running, DVOM should indicate less than one volt. If DVOM reading is greater than one volt, check for open, short to voltage, corrosion or loose connection in ground circuit.

Power Circuits

1. Using DVOM, check for battery voltage between PCM continuous power terminal(s) and ground. For connector terminal identification, see appropriate SELF-DIAGNOSTICS article. See WIRING DIAGRAMS article. If battery voltage is not present, check for open fuse or fusible link. If fuse or fusible link is okay, check for open in circuit between PCM continuous power terminal and power source.
2. Turn ignition switch to RUN position. Using DVOM, check for battery voltage between PCM ignition power terminals and ground. If battery voltage is not present, check IGN fuse. If fuse is okay, check for open in circuit between battery and ignition switch, and between ignition switch and PCM ignition power terminal. If circuits are okay, check for defective ignition switch.
3. Connect DVOM between ground and PCM starter (crank) signal terminal. On vehicles with manual transmission/transaxle, depress clutch pedal. On vehicles with automatic transmission/transaxle, place gearshift lever in Park. On all vehicles, turn ignition switch to START position. Battery voltage should be present only when ignition switch is in START position.
4. If voltage is not present, check CRANK fuse or fusible link between ignition switch and PCM starter (crank) signal terminal. If fuse or fusible link is okay, check for open in circuit between ignition switch and PCM starter (crank) signal terminal, or check for defective ignition switch.

ENGINE SENSORS & SWITCHES

Note. For additional sensor testing specifications, see appropriate SENSOR OPERATING RANGE CHARTS article.

Note. Perform powertrain diagnostic system check prior to testing, and after completing any repairs. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.

Manufacturer does not provide testing procedures for many individual systems and components. For sensor and switch testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

Note. For location of components, see COMPONENT LOCATIONS .

PARK NEUTRAL POSITION SWITCH

See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS for testing procedures.

MOTORS, RELAYS & SOLENOIDS

Note. Manufacturer does not provide testing procedures for many individual systems and components. For module, motor, relay and solenoid testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

Note. For location of components, see COMPONENT LOCATIONS .

IDLE AIR CONTROL MOTOR

See IDLE CONTROL SYSTEM .

A/C COMPRESSOR CLUTCH RELAY

See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

FUEL PUMP RELAY

Fuel pump relay is located in underhood fuse/relay block. To test fuel pump relay, see FUEL PUMP ELECTRICAL CIRCUIT under appropriate NO-START - ENGINE CRANKS OKAY in appropriate BASIC DIAGNOSTIC PROCEDURES article.

FUEL SYSTEMS (GASOLINE)

Manufacturer does not provide testing procedures for many individual systems and components. For fuel system testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

Note. Perform powertrain diagnostic system check prior to testing, and after completing any repairs. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article.

Note. For location of components, see COMPONENT LOCATIONS .

FUEL DELIVERY

Note. See appropriate FUEL SYSTEM PRESSURE TEST article under BASIC FUEL SYSTEM CHECKS in BASIC DIAGNOSTIC PROCEDURES - CARS - EXCEPT PRIZM article.

Fuel Pump Circuit

See FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS under appropriate NO-START - ENGINE CRANKS OKAY article under NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES - CARS - EXCEPT PRIZM article.

Fuel Pressure Regulator

See appropriate FUEL SYSTEM PRESSURE TEST article under BASIC FUEL SYSTEM CHECKS in BASIC DIAGNOSTIC PROCEDURES - CARS - EXCEPT PRIZM article.

See FUEL PUMP RELAY under MOTORS, RELAYS & SOLENOIDS.

FUEL SYSTEMS (2.2L - CAVALIER CNG)

Note. For location of components, see COMPONENT LOCATIONS .

IDLE CONTROL SYSTEMS

Note. For idle control system testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

Note. Perform powertrain diagnostic system check prior to testing, and after completing any repairs. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article.

IGNITION SYSTEMS

Note. For basic ignition system checks, see appropriate BASIC DIAGNOSTIC PROCEDURES article.

Note. For ignition system testing, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

EMISSION SYSTEMS & SUBSYSTEMS

Note. For emission and subsystem testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

Electric AIR Pump

Note. For electric AIR pump testing, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

EXHAUST GAS RECIRCULATION

Note. Manufacturer does not provide testing procedures for many individual systems and components. For EGR system testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

Note. For EGR system diagnosis, see appropriate INSPECTION/MAINTENANCE PROCEDURES in appropriate SELF-DIAGNOSTICS article.

Exhaust System Check (Except Saturn)

1. Remove the pre-catalyst HO2S sensor. Install the Exhaust Back Pressure Gauge (J 35314-A) in place of the HO2S sensor. Start and run the engine. Increase and monitor the engine speed at specified RPM. See «EXHAUST BACKPRESSURE SPECIFICATIONS»(ref-150423-S00552135742002111900000) table. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value? If yes, go to next step. If no, go to step 6 .
2. Turn the engine off and place the ignition in the lock position. Remove the J 35314-A. Install the pre-catalyst HO2S sensor. Remove the post-catalyst HO2S sensor. Install the J 35314-A in place of the post HO2S sensor. Start and run the engine. Increase and monitor the engine at specified RPM. See «EXHAUST BACKPRESSURE SPECIFICATIONS»(ref-150423-S00552135742002111900000) table. Observe the exhaust system back pressure reading on the gauge. Does the reading exceed the specified value? If yes, go to next step. If no, go to step 4 .
3. Inspect the exhaust system for the following conditions: Damage in the exhaust pipe. Debris in the exhaust pipe. Muffler or resonator internal failure. Two-layer exhaust pipe separation. After repairs, go to step 5 .
4. Replace the catalytic converter. After repairs, go to next step.
5. Remove the J 35314-A. Install the post-catalyst HO2S sensor. Clear any codes. Road test the vehicle in order to verify the repair. Did you find and correct the condition? If yes, system is okay. If no, go to step 1 .
6. Remove the J 35314-A. Install the pre-catalyst HO2S sensor. Clear any codes. Road test the vehicle in order to verify the repair. Did you find and correct the condition? If yes, system is okay. If no, go to step 1 .

EXHAUST BACKPRESSURE SPECIFICATIONS

Exhaust System Check - Parked (Saturn)

1. Remove oxygen sensor.
2. Insert Exhaust Back Pressure Adapter (SA9306E) into exhaust manifold. The thread designation is M18 x 1.50.
3. Connect Gauge Bar Set (SA9127E), 0-60 in. H2O (0-15 kPa) gauge to back pressure adapter.
4. With engine at normal operating temperature, observe exhaust back pressure at 4000 RPM.
5. The exhaust back pressure must be less than 20.13 in. H2O (5.0 kPa).

FUEL EVAPORATION

Note. Ensure all vacuum line and EVAP system components are not damaged or missing before proceeding with this test.

Cleaning Procedure

1. Raise the vehicle.
2. Remove the EVAP canister.
3. Turn OFF the main valve on the J 41413.
4. Disconnect the hose from the diagnostic station pressure regulator.
5. Using a section of vacuum hose, connect one end onto the diagnostic station pressure regulator.
6. Connect the other end of the vacuum hose to the canister side of the purge pipe.
7. Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
8. If the nitrogen does not dislodge the carbon particles, replace the purge pipe.
9. Return the EVAP pressure/purge diagnostic station to the original condition of the station.
10. Install a new EVAP canister.
11. Lower the vehicle.
12. Install a new EVAP canister purge valve.
13. Return to the published service procedure.

Required Service

The PCV system may require service for obstructions if any of the following conditions exist

1. Rough idle.
2. Stalling or slow idle speed.
3. Oil leaks.
4. Oil in air cleaner.
5. Sludge in engine.

A leaking PCV valve or hose could cause

1. Rough idle.
2. Stalling.
3. High idle speed.

If engine idles rough, check for clogged PCV valve, or plugged or broken hoses BEFORE adjusting idle. Check PCV valve application to ensure correct valve is fitted. Replace PCV valve if required.

Checking PCV Valve Function

1. Disconnect PCV valve vacuum hose from cylinder head cover. Run engine at idle. Place thumb over open end of PCV valve vacuum hose to check for vacuum. If vacuum does not exist, check for obstruction in source vacuum supply. If source vacuum supply is okay, replace PCV valve.
2. Turn ignition off. Remove PCV valve. Shake valve and listen for rattle of check valve inside PCV valve. If a clear rattle is not heard, replace PCV valve.
3. Visually inspect valve for varnish or deposits which may make PCV valve operation sticky or restricted, or cause incomplete seating of valve. Replace as necessary.
4. Engine must be sealed for PCV system to function as designed. If leakage, sludging or dilution of oil is noted and PCV system is functioning properly, check engine for cause and repair as required to ensure PCV system will continue to function properly.
5. An engine operating without any crankcase ventilation can be damaged, so it is important to replace PCV valve and air cleaner breather (if equipped) at regular intervals (at least every 30,000 miles). Check all hoses and clamps for failure or deterioration.

MISCELLANEOUS CONTROLS

Note. Although some of the controlled devices listed here are not technically engine performance components, they can affect driveability if they malfunction.

Note. Manufacturer does not provide testing procedures for many individual systems and components. For system and component testing not listed, perform related DTC testing procedure. See appropriate SELF-DIAGNOSTICS article.

A/C COMPRESSOR CLUTCH CONTROLS

Note. For A/C compressor clutch circuit testing, see appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

ELECTRIC COOLING FAN

Note. For electric cooling fan circuit testing, see appropriate ELECTRIC COOLING FANS article in ENGINE COOLING.

TRANSMISSION

Note. For transmission electronic controls testing, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. For component circuit identification, see WIRING DIAGRAMS article.