Engine Controls - Removal & Installation: Other Oldsmobile Bravada III

COMPUTERIZED ENGINE CONTROLS

Note. All vehicles are equipped with a Powertrain Control Module (PCM) for engine control.

ELECTRICALLY ERASABLE PROGRAMMABLE READ-ONLY MEMORY

The Electrically Erasable Programmable Read-Only Memory (EEPROM) is a permanent memory that is part of PCM. EEPROM cannot be replaced. EEPROM contains program and calibration information that PCM uses to control powertrain. If PCM is replaced, ensure NEW PCM software/calibration is correct and most recent version for vehicle. EEPROM must be programmed when NEW PCM is installed. Program EEPROM using latest software for that specific vehicle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

POWERTRAIN CONTROL MODULE

Note. Before replacing PCM, carefully inspect all wiring and control components. Failure to test for short circuits may result in repeated PCM failure due to shorts and Quad-Driver failure. To prevent internal damage to PCM, ensure ignition switch is in OFF position when connecting or disconnecting PCM harness connectors or any electrical components. Inspect PCM connector gaskets and ensure they are installed correctly. PCM connector gaskets prevent contaminants from entering PCM.

Ensure ignition is off. Disconnect negative battery cable. Locate PCM at left front of engine, on intake manifold plenum. (Scheme 10) Loosen PCM harness connector bolts. Disconnect PCM harness connectors. Remove 4 PCM mounting bolts. Remove PCM from intake manifold plenum.

Scheme 10

Install PCM to intake manifold plenum. Connect harness connectors to PCM. Tighten PCM harness connector bolts to specification. See TORQUE SPECIFICATIONS . Reconnect negative battery cable. If NEW PCM has been installed, PCM MUST be programmed. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

1. Install a 3/8" drive breaker bar onto the drive belt tensioner. (Scheme 13) Turn breaker bar clockwise enough to relieve the tension on the drive belt. Remove drive belt. Release tension on drive belt tensioner.
2. Remove 3 power steering pump mounting bolts and set power steering pump aside. Disconnect camshaft position actuator solenoid valve harness connector. Remove camshaft position actuator solenoid valve mounting bolt. (Scheme 11)
3. Remove camshaft position actuator solenoid valve. Clean any debris from camshaft position actuator solenoid valve mounting hole. To install, reverse removal procedure. Tighten fasteners to specification. See «TORQUE SPECIFICATIONS»(ref-149799-S00793602662002102500000).

Scheme 11

Turn ignition off. Disconnect Accelerator Pedal Position (APP) sensor harness connector. APP sensor is located on bracket above accelerator pedal. (Scheme 12) Remove 2 APP sensor retaining screws. Remove APP sensor.

Scheme 12

Install APP sensor onto bracket above accelerator pedal. Tighten 2 APP sensor retaining screws to specification. See TORQUE SPECIFICATIONS . Reconnect harness connector to APP sensor.

CAMSHAFT POSITION SENSOR

See CAMSHAFT POSITION SENSOR under IGNITION SYSTEMS.

CRANKSHAFT POSITION SENSOR

See CRANKSHAFT POSITION SENSOR under IGNITION SYSTEMS.

1. Turn ignition off. Disconnect negative battery cable. Drain coolant below level of Engine Coolant Temperature (ECT) sensor into a suitable container.
2. Install a 3/8" drive breaker bar onto the drive belt tensioner. (Scheme 13) Turn breaker bar clockwise enough to relieve the tension on the drive belt. Remove drive belt. Release tension on drive belt tensioner.
3. Remove generator positive post cable nut. Remove A/C line bracket-to-engine lift hook bolt. Remove engine lift hook. Remove 3 generator mounting bolts. (Scheme 14) Remove generator.
4. Disconnect ECT sensor harness connector. (Scheme 15) ECT sensor is located on left front of engine, above thermostat housing. (Scheme 16) Remove ECT sensor.

Scheme 13

Scheme 14

Scheme 15

Scheme 16

1. Whenever ECT sensor is removed, coat threads with Sealer (12346004 or equivalent) before reinstallation. Install ECT sensor into engine and tighten to specification. See «TORQUE SPECIFICATIONS»(ref-149799-S00793602662002102500000).
2. Reconnect harness connector to ECT sensor. Reinstall generator. Tighten generator mounting bolts to specification. Connect cable to generator positive post and tighten nut to specification. Reinstall engine lift hook. Reinstall A/C line bracket-to-engine lift hook bolt.
3. Install a 3/8" drive breaker bar onto the drive belt tensioner. (Scheme 13) Turn breaker bar clockwise enough to allow installation of drive belt. Install drive belt. Release tension on drive belt tensioner.
4. Reconnect negative battery cable. Fill and bleed cooling system. See «COOLING SYSTEM BLEEDING»(ref-149799-S34521017462002102500000) under COOLING SYSTEM.

FUEL TANK PRESSURE SENSOR

See FUEL TANK PRESSURE SENSOR under FUEL SYSTEMS.

Disconnect negative battery cable. Disconnect Intake Air Temperature (IAT) sensor harness connector. IAT sensor is located in intake air duct. Pull and twist outward on IAT sensor to dislodge sensor from intake air duct.

Push and twist IAT sensor into position into the intake air duct. Reconnect harness connector to IAT sensor. Connect negative battery cable and tighten negative battery cable-to-battery bolt to specification. See TORQUE SPECIFICATIONS .

KNOCK SENSOR

See KNOCK SENSOR under IGNITION SYSTEMS.

Turn ignition off. Disconnect Manifold Absolute Pressure (MAP) sensor harness connector. (Scheme 17) MAP sensor is located on top left of engine. Press MAP sensor retainer locking tabs inward and pull upward to remove retainer from intake manifold. Remove MAP sensor from intake manifold. To install, reverse removal procedure. Replace MAP sensor seal as necessary.

Scheme 17

OXYGEN SENSORS

Note. The Heated Oxygen Sensor 1 (HO2S 1) is located in the exhaust manifold. see scheme 9 Heated Oxygen Sensor 2 (HO2S 2) is mounted in the exhaust pipe behind the catalytic converter. see scheme 10 Oxygen sensors are equipped with a permanent pigtail which must remain intact when removing sensor.

COOLING SYSTEM BLEEDING

Place a large funnel in radiator filler neck. Pour one-half of cooling system capacity of DEX-COOL ® coolant into radiator. Fill remaining capacity with clean, drinkable water to 0.5" (13 mm) below radiator filler neck. Start engine and let cooling system warm up. If coolant level drops when thermostat opens, add clean drinkable water to just below filler neck. Install radiator cap and top off reservoir. Check for leaks.

Disconnect Camshaft Position (CMP) sensor harness connector. (Scheme 18) Remove CMP sensor retaining bolt and CMP sensor. To install, reverse removal procedure. Tighten CMP sensor retaining bolt to specification. See TORQUE SPECIFICATIONS.

Scheme 18

Note. Crankshaft Position (CKP) sensor variation learn procedure will need to be performed whenever CKP sensor is removed or replaced. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

Raise and support vehicle. Disconnect Crankshaft Position (CKP) sensor harness connector. (Scheme 19) Remove CKP sensor retaining bolt and CKP sensor.

Scheme 19

Install CKP sensor into engine using NEW "O" ring lubricated with clean engine oil. Tighten CKP sensor retaining bolt to specification. See TORQUE SPECIFICATIONS . Reconnect CKP sensor harness connector. Lower vehicle. Perform CRANKSHAFT POSITION (CKP) SENSOR VARIATION LEARN PROCEDURE in COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

Turn ignition off. Disconnect negative battery cable. Remove 2 air cleaner resonator mounting bolts. Loosen air cleaner resonator-to-throttle body clamp. Move air cleaner resonator aside. Disconnect harness connector(s) from ignition coil(s). Remove retaining bolt(s) from ignition coil(s). Remove ignition coil(s) from engine.

1. Install ignition coil(s) into engine. Ensure ignition coil(s) are properly seated to the valve cover. Install and tighten ignition coil retaining bolt(s) to specification. See «TORQUE SPECIFICATIONS»(ref-149799-S00793602662002102500000) .
2. Reconnect ignition coil(s) harness connector(s). Reinstall air cleaner resonator. Tighten air cleaner resonator mounting bolts and air cleaner resonator-to-throttle body clamp to specification. Connect negative battery cable and tighten negative battery cable-to-battery bolt to specification.

Turn ignition off. Disconnect negative battery cable. Raise and support vehicle. Disconnect knock sensor harness connector(s). (Scheme 20) Remove knock sensor retaining bolt and knock sensor. To install, reverse removal procedure. Tighten knock sensor retaining bolt(s) to specification. See TORQUE SPECIFICATIONS.

Scheme 20

FUEL SYSTEM PRESSURE RELEASE

Remove fuel tank cap. Remove fuel pump relay from underhood junction block. (Scheme 21) Crank engine. Allow engine to start and stall. Crank the engine an additional 3 seconds. Turn ignition off. Disconnect negative battery cable. Install and tighten fuel filler cap. Install fuel pump relay.

Scheme 21

FUEL LINE DISCONNECT FITTINGS

Note. Fuel line disconnect fittings may contain metal or plastic collar. see scheme 15and see scheme 16. Determine type of disconnect fitting used and use proper procedure for type of disconnect fitting being serviced.

See OXYGEN SENSORS under ENGINE SENSORS & SWITCHES.

Remove air cleaner resonator from top of engine. Disconnect EVAP canister purge line from throttle body. Disconnect throttle body harness connector. Remove 4 throttle body-to-intake manifold bolts. (Scheme 22) Remove throttle body. Remove flange gasket and discard.

Clean gasket surface on intake manifold and throttle body. Install NEW flange gasket. Install throttle body assembly. Install throttle body-to-intake manifold bolts and tighten to specification. See TORQUE SPECIFICATIONS . To complete installation, reverse removal procedure.

Scheme 22

1. Raise and support vehicle. Remove fuel tank shield (if equipped). see scheme 17 Disconnect EVAP vapor pipe and EVAP vent valve pipe from EVAP canister. see scheme 21
2. Disconnect EVAP purge pipe from EVAP canister. (Scheme 23) Move rear of EVAP canister forward in the EVAP canister bracket to release EVAP canister bracket rear tabs. (Scheme 24) Remove EVAP canister from EVAP canister bracket front tab and remove EVAP canister.

1. Install EVAP canister into EVAP canister bracket front tab and press rear of EVAP canister into the EVAP canister bracket rear tabs. (Scheme 24)
2. Reconnect EVAP vapor pipe and EVAP vent valve pipe to EVAP canister. see scheme 21 Reconnect EVAP purge pipe to EVAP canister. (Scheme 23)
3. Reinstall fuel tank shield (if equipped). see scheme 17 Tighten fuel tank shield bolts to specification. See «TORQUE SPECIFICATIONS»(ref-149799-S00793602662002102500000). Lower vehicle.

Scheme 23

Scheme 24

1. Raise and support vehicle. Disconnect EVAP canister purge solenoid harness connector. (Scheme 25) EVAP canister purge solenoid is located on left side center of engine, below intake manifold.
2. Disconnect EVAP purge pipe and engine vacuum pipe from EVAP canister purge solenoid. Bend tab on EVAP canister purge solenoid bracket and remove EVAP canister purge solenoid from EVAP canister purge solenoid bracket. To install, reverse removal procedure.

Scheme 25

1. Raise and support vehicle. Disconnect EVAP canister vent valve harness connector. EVAP canister vent valve is located near right rear corner of fuel tank. see scheme 20
2. Disconnect EVAP vent pipe from EVAP canister vent valve. (Scheme 26) Bend tab on EVAP canister vent valve bracket and remove EVAP canister vent valve from EVAP canister vent valve bracket. To install, reverse removal procedure.

Scheme 26

Cleaning Procedure

1. Remove EVAP canister. See «EVAP CANISTER»(ref-149799-S15389290402002102500000) . Turn main valve to OFF position on EVAP Pressure/Purge Diagnostic Station. Disconnect hose from EVAP Pressure/Purge Diagnostic Station pressure regulator. Using a section of vacuum hose, connect one end to EVAP Pressure/Purge Diagnostic Station pressure regulator. Connect other end of vacuum hose to EVAP canister side of purge pipe.
2. Turn main nitrogen cylinder valve to ON and continue to discharge nitrogen for 15 seconds. If the nitrogen does not dislodge the carbon particles, replace the purge pipe. Replace EVAP canister. Continue with DTC test.