Home ReviewsRefund
Home/Pontiac/Vibe/Pontiac Vibe I (2002-2004)/Repair manual/Testing & Diagnostics/Engine Control System - System & Component Testing: Other
Contents Wiring diagrams Section: Testing & Diagnostics All sections

Engine Control System - System & Component Testing: Other Pontiac Vibe I

Testing & Diagnostics 5 illustrations ~1293 words

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 DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 1.8L VIBE 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 .

Ground Circuits

  1. Using DVOM, check for continuity to ground at PCM ground terminals. For connector terminal identification (Scheme 96)- (Scheme 99). To identify circuits, see «WIRING DIAGRAMS»(ref-152779-S19767696022003112600000). 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 short to voltage, corrosion or loose connection in ground circuit.

Scheme 96

Scheme 96
Scheme 96

Scheme 97

Scheme 97
Scheme 97

Scheme 98

Scheme 98
Scheme 98

Scheme 99

Scheme 99
Scheme 99

Power Circuits

  1. Using DVOM, check for battery voltage between PCM continuous power terminal(s) and ground. For connector terminal identification (Scheme 96)- (Scheme 99). To identify circuits, see «WIRING DIAGRAMS»(ref-152779-S19767696022003112600000). 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 EFI fuse (15-amp). 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. 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.

SENSORS & SWITCHES

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

Note. Perform powertrain diagnostic system check prior to testing, and after completing any repairs. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTICS SYSTEM in SELF-DIAGNOSTICS - 1.8L VIBE 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 DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 1.8L VIBE 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 DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 1.8L VIBE article.

Note. For location of components, see COMPONENT LOCATIONS .

A/C COMPRESSOR CLUTCH RELAY

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

CIRCUIT OPENING RELAY

Note. Circuit opening relay may also be referred to as fuel pump relay.

Circuit opening relay is located in Instrument Panel (IP) fuse block. (Scheme 100) To test the circuit opening relay, see FUEL PUMP ELECTRICAL CIRCUIT DIAGNOSIS under FUEL SYSTEMS.

Scheme 100

Scheme 100: CIRCUIT OPENING RELAY
Scheme 100: CIRCUIT OPENING RELAY

EFI RELAY

Note. EFI relay may also be referred to as Ignition Relay.

Note. For circuit reference, see WIRING DIAGRAMS . For component locations, see COMPONENT LOCATIONS in SELF-DIAGNOSTICS - 1.8L VIBE article. For connector identification, see CONNECTOR IDENTIFICATION in SELF-DIAGNOSTICS - 1.8L VIBE article.

IDLE AIR CONTROL MOTOR

See IDLE CONTROL SYSTEM .

FUEL SYSTEMS

WARNINGALWAYS release fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components.

Manufacturer does not provide testing procedures for many individual systems and components. For fuel system testing not listed, perform related DTC testing procedure. See SELF-DIAGNOSTICS - 1.8L VIBE 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 SELF-DIAGNOSTICS - 1.8L VIBE article.

Note. For location of components, see COMPONENT LOCATIONS .

FUEL SYSTEM PRESSURE RELEASE

CAUTIONDo not perform this procedure if the engine is hot. Unburned fuel entering the catalytic converter could damage the converter catalyst. DO NOT allow fuel to contact engine or electrical components.

Note. Circuit opening relay may also be called the fuel pump relay.

Fuel system is under pressure. Pressure must be relieved prior to servicing fuel system. Fuel pressure may be relieved by using the following method

  1. Loosen fuel filler cap to relieve the fuel tank pressure.
  2. Remove the Instrument Panel (IP) storage compartment.
  3. Reach in through the IP storage compartment opening and remove the circuit opening relay from the fuse block IP. (Scheme 100)
  4. Start the engine and allow the engine to stall.
  5. Crank the engine for an additional 3 seconds after stalling to assure relief of any remaining fuel pressure.
  6. Disconnect and isolate the negative battery cable to avoid re-pressurizing fuel system. Make necessary checks or repairs. Cover the fuel system components with a shop towel before disconnecting.
  7. To activate fuel system, reverse disable procedure. Check fuel system for leaks.
  8. Install the IP storage compartment.
  9. Install and tighten the fuel filler cap.

FUEL SYSTEM CLEANING

CAUTIONBefore servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

Note. If a fuel system problem is caused by contaminated fuel or other foreign material in the fuel tank, the tank must be cleaned. If the tank is rusted or is still contaminated after cleaning, the tank must be replaced. Only use oil-free compressed air to blow out the fuel pipes. Inspect the fuel tank internally and clean the fuel tank if the you find a plugged fuel filter.

Cleaning Procedure

  1. Disconnect the negative battery cable.
  2. Remove the fuel tank from the vehicle.
  3. Remove the fuel sender assembly from the fuel tank.
  4. Fill the fuel tank with hot water.
  5. Shake the fuel tank vigorously for 5 minutes.
  6. Drain the fuel tank.
  7. Ensure all of the water is removed from the fuel tank. If the inside of the fuel tank contains any traces of rust after cleaning, replace the fuel tank.
  8. Install the fuel sender assembly to the fuel tank.
  9. Install the fuel tank to the vehicle.
  10. Refill the fuel tank.
  11. Connect the negative battery cable.
  12. Check for fuel leaks and repair as necessary.

Note. Circuit opening relay may also be referred to as the fuel pump relay.

See CIRCUIT OPENING RELAY under MOTORS, RELAYS & SOLENOIDS.

IDLE CONTROL SYSTEMS

Note. For idle control system testing not listed, perform related DTC testing procedure. See SELF-DIAGNOSTICS - 1.8L VIBE 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 SELF-DIAGNOSTICS - 1.8L VIBE article.

EMISSION SYSTEMS & SUBSYSTEMS

Note. For emission and subsystem testing, perform appropriate INSPECTION/MAINTENANCE PROCEDURES and related DTC testing procedures. See DRIVE CYCLES in SELF-DIAGNOSTICS - 1.8L VIBE article.

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 SELF-DIAGNOSTICS - 1.8L VIBE 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 ENGINES.

TRANSMISSION

Note. For transmission electronic controls testing, see appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

More articles — Engine Control System - System & Component Testing