Ccc Components Removal & Installation Chevrolet Camaro III рестайлинг

Note. This article does not apply to Cadillac 4.5L DFI, Reatta, Riviera and Toronado 3.8L PFI equipped vehicles. For information on these vehicles, see appropriate articles.

STATIC CHARGE (VOLTS)

Servicing ECM Using 3M Anti-Static Mat. Scheme 1

ECM/MEM-CAL - 1986-91 MODELS WITH MEM-CAL

Note. To prevent damage to ECM, ignition must be off before disconnecting or reconnecting any ECM power source (i.e.; battery, ECM connectors, ECM fuse, jumper cables, etc.).

Note. The following steps are courtesy of General Motors. TECHNICAL SERVICE BULLETIN NO. T-91-95, JUNE, 1991 & TECHNICAL SERVICE BULLETIN NO. 91-6E-18, JUNE, 1991

Problem

When installing a service replacement ECM, the use of incorrect MEM-CAL installation procedures may cause the ECM to fail before it can be installed in the vehicle. This condition may appear as if the ECM were defective when it was shipped to the dealership when, in fact, it was damaged while being installed. In addition, this condition may also occur when installing as "updated" service into the vehicle's original equipment ECM. Excessive vertical force may be generated in two ways

1. Incorrect MEM-CAL installation procedure.
2. Interference between MEM-CAL and cover.

Repair

To repair this condition use the following procedure

This procedure supersedes any instructions regarding MEM-CAL installation dated prior to September, 1990.

1. Inspect the MEM-CAL to determine if a cork spacer is glued to the top side of the MEM-CAL assembly. If so, remove it prior to installation.
2. Align small notches with matching notches in the ECM MEM-CAL socket.
3. VERY GENTLY press down on the ends of the MEM-CAL until the locking levers are rotated toward the sides of the MEM-CAL. NOTE: To avoid ECM damage, do not press on the ends of the MEM-CAL unit until the levers snap into place. DO NOT use any vertical force beyond the minimum required to engage the MEM-CAL into its socket.
4. While continuing light pressure on the ends of the MEM-CAL, use your index fingers to press the locking levers inward until they are snapped into place. Listen for click.
5. Install MEM-CAL cover and install ECM in vehicle.

Note. If diagnostic procedures require replacement of ECM, ensure ECM and PROM part numbers are correct. Service ECM DOES NOT contain a PROM. Old PROM must be installed in service ECM. Part number verification is critical for proper vehicle operation.

Scheme 2

1. Remove ECM from vehicle. ECM is located between the seats at rear bulkhead. (Scheme 2) Position ECM so that bottom cover is facing upward. Remove slide-off PROM access cover by depressing locking tab. (Scheme 2): Locating ALDL Connector (Under Center Console) & ECM
2. Using PROM removal tool, grasp PROM at narrow ends. Gently rock PROM from end to end while pulling up. If new PROM is to be installed, remove old PROM from PROM carrier.

Note. Note location of reference notches in PROM, carrier and ECM for reassembly reference.

1. Check that new PROM has same service number as old one. Place new PROM in PROM carrier. Position squarely over ECM PROM socket. Press on PROM carrier until PROM is firmly seated in ECM. NOTE: Make sure that reference notches in both ECM and PROM are properly aligned. If PROM is installed backwards and key is turned on, PROM will be destroyed.
2. Reinstall PROM access cover on ECM. Reinstall ECM in vehicle as previously described. Start engine and ground diagnostic test lead. Watch for trouble Code 51.
3. If this occurs, PROM is not fully seated in ECM, installed backwards, has bent pins or is defective. If pins are bent and crack when straightened, PROM must be replaced. If PROM is installed backwards or is defective, it must be replaced.

CALPAC

Some ECM models use a CALPAC as well as a PROM. (Scheme 3) The CALPAC must also be removed from replaced ECM and installed in new one. Removal and replacement procedures for CALPAC are same as for PROM. If units are installed improperly, grounding diagnostic test lead will set Code 52.

Scheme 3

Using 2 fingers, push retaining clips back from MEM-CAL. At same time, grasp it at both ends and lift up out of socket. DO NOT remove MEM-CAL cover.

Carefully align MEM-CAL pins with ECM pin holes. DO NOT press in middle of MEM-CAL. Push downward evenly on ends of MEM-CAL until retaining clips on ends of MEM-CAL snap into place.

Disconnect negative battery cable at battery. Raise vehicle on hoist. Disconnect electrical connector from oxygen sensor. Carefully remove oxygen sensor from exhaust pipe.

Note. Oxygen sensor may be difficult to remove when engine temperature is less than 120°F (49°C). Excessive removal force may damage threads in exhaust manifold or pipe.

1. Whenever an oxygen sensor is removed, its threads must be coated with anti-seize compound before it is reinstalled. New oxygen sensors will already have this compound applied to threads.
2. Install oxygen sensor in exhaust pipe and tighten sensor to 30 ft. lbs. (41 N.m). CAUTION: Correct torque of O2 sensor is critical to prevent crushing glass beads in graphite anti-seize compound. Crushing glass beads will cause sensor to seize in exhaust manifold, causing necessary replacement of exhaust manifold upon next removal attempt.
3. Reconnect electrical connector to oxygen sensor. Lower vehicle from hoist. Reconnect negative battery cable.

1. Disconnect negative battery cable. Remove serpentine belt. Raise vehicle on hoist.
2. Remove inner fender splash shield. Remove crankshaft balancer bolt.
3. On "A" and "E" bodies, slide balancer toward right fender.
4. On "C", "H" and "N" bodies, remove crankshaft balancer.
5. On all models, remove camshaft sensor bolt. Remove sensor. Disconnect sensor harness connector.

To install, reverse removal procedure. Tighten sensor bolt to 75 INCH lbs. (8.5 N.m) and crankshaft balancer bolt to 200 ft. lbs. (270 N.m). Ensure "T" latch on sensor harness connector is properly engaged.

1. Disconnect negative battery cable. Remove serpentine belt. Raise vehicle on hoist.
2. Remove inner fender splash shield. Remove crankshaft balancer bolt.
3. On "A" and "E" bodies, slide balance toward right fender/cradle.
4. On "C", "H" and "N" bodies, remove crankshaft balancer.
5. On all models, remove crankshaft sensor mounting bolts. Remove sensor. Disconnect crankshaft sensor harness connector.

To install reverse removal procedure. Tighten sensor bolts to 22 ft. lbs. (30 N.m) and crankshaft balancer bolt to 200 ft. lbs. (270 N.m). Ensure "T" latch on sensor harness connector is properly engaged.

Removal of all other sensors, switches and solenoids is accomplished by turning ignition off, removing electrical and/or vacuum connectors and removing or detaching component.

1. Fuel pump is located inside the fuel tank. To access or remove fuel pump, fuel tank must be dropped from vehicle. See «FUEL TANK ("F" BODY)»(/chevrolet/camaro/iii-1985-1992/remont/removal-installation/#ccc-components-removal-installation) .
2. Remove fuel pump assembly by turning cam lock ring counterclockwise. Lift fuel pump assembly from fuel tank opening. Take care to prevent damage to rubber insulator and strainer during removal.
3. To install, reverse removal procedure. Replace with NEW "O" ring during reassembly. Reinstall fuel tank.

1. Drain fuel from fuel tank. Relieve fuel system pressure. Disconnect battery negative terminal. Raise car on hoist. Disconnect exhaust pipe at converter and rear hanger. Allow exhaust to hang over axle assembly.
2. Remove tailpipe and muffler heat shields. Remove fuel filler neck shield behind left rear tire. Remove rear suspension track bar and brace. Disconnect harness connector to fuel pump assembly.
3. Disconnect all fuel lines. Remove fuel line retaining bracket on left side and remove brake line clip from bracket.
4. Position support jack under axle assembly. Disconnect lower ends of shock absorbers. Disconnect rear stabilizer bar from frame (if equipped).
5. Lower axle assembly and remove both coil springs. Remove tank straps bolts. Remove fuel tank by rotating front of tank down and sliding to the right. Lower rear suspension as far as possible without damaging brake lines and cables. Remove fuel pump assembly from fuel tank.
6. To install, reverse removal procedure. Always replace "O" rings. Ensure anti-squeak pieces on top of fuel tank is reinstalled.

1. Disconnect negative battery cable to avoid possible fuel discharge if an accidental attempt is made to start engine.
2. Remove fuel filler cap.
3. Connect Fuel Pressure Gauge (J-34730-1) to fuel pressure connection. Wrap a shop towel around fitting while connecting gage to avoid spillage.
4. Install bleed hose into an approved container and open valve to bleed system pressure. Fuel connections are now safe for servicing.
5. Drain any fuel remaining in gage into an approved container.
6. Drain fuel tank as necessary.
7. Remove fuel filler door bezel attaching screws and bezel.
8. Lift fuel tank filler neck housing and disconnect drain hose from nipple.
9. Remove fuel tank filler neck housing.
10. Remove fuel hoses and fuel vapor hose from fuel sender assembly.
11. Plug or pinch fuel feed and return hoses.
12. Disconnect fuel sender electrical connector.
13. Remove fuel sender assembly attaching screws, fuel sender assembly and gasket.
14. Clean gasket sealing surfaces. Inspect screw o-rings for cuts, nicks, swelling or distortion. Inspect fuel feed, return and vent hoses for cuts, nicks, swelling or distortion. Replace if necessary.
15. To install, reverse removal procedure using NEW gasket. Check for fuel leaks.

1. Disconnect battery negative terminal. Drain fuel tank. Remove fuel tank filler door, filler housing and drain hose. Disconnect fuel feed hose, fuel return hose, vapor hose and electrical connector from fuel meter and pump assembly.
2. Remove license plate to gain access to fascia-to-impact bar bolts. Remove 2 bolts securing fascia to impact bar.
3. Raise vehicle on hoist. Remove spare tire and spare tire carrier. Disconnect oxygen sensor harness connector. Remove exhaust system as a complete unit by disconnecting from front crossover pipe at exhaust manifold.
4. Remove both rear inner fender panels. Disconnect radio antenna ground strap. Disconnect fuel tank cables from rear right and left hand stabilizer shaft brackets. Remove all rear lights. Remove 4 screws securing bottom edge of fascia-to-energy absorber pad.
5. Remove 3 nuts securing each side of fascia-to-horizontal body retainer. Remove nuts from right and left vertical retainer securing fascia to body. Loosen, but do not remove, 4 remaining frame extension bolts.
6. With an assistant, remove remaining frame extension bolts and pull fuel tank and frame assembly rearward, pushing cover outward. Tilt assembly down to remove and clear cover.
7. Remove tank straps and remove tank. Remove fuel pump assembly from fuel tank. If fuel tank is being replaced, transfer cables, fuel meter and pump, and fuel connector to new tank.
8. To install, reverse removal procedure. Check for fuel leaks.

See also:
• FUEL TANK ("F" BODY)