Engine - Cold Driveability Improvement
BULLETIN NUMBER ISSUE DATE GROUPSB87-03-001 April 17, 1987 EMISSIONS
1986 I-MARK (JT) COLD DRIVEABILITY
VEHICLES AFFECTED
1986 I-Mark (JT) models, SERVICE INFORMATION
Cold engine driveability at low ambient temperature can be improved with the installation of:
a. A new computer chip (PROM) for the electronic control module (ECM).
b. A CTA kit consisting of a vacuum switching valve (VSV) and associated hardware to modify the distributor vacuum advance during cold operation.
These two components complement each other and must be installed at the same time.
SERVICE PROCEDURE
Prom Replacement:
1. Remove the ECM from the passenger compartment as described in the appropriate Workshop Manual.
2. Follow the instructions packed with the new PROM to remove the old PROM from the ECM and install the new PROM in its place.
NOTE On Sheet 1 of the instructions, you are told to make sure that the new PROM bears the same part number as the one being removed. This Service Bulletin requires that you use a different part number as specified under PARTS INFORMATION.
3. Install and connect the ECM as described in the appropriate Workshop Manual.
4. Connect a jumper lead between the A and C terminals of the ECM diagnostic connector. Turn the ignition on:
a. If Code 12 flashes four times, with no other codes present, the PROM is correctly installed. Go on with this procedure.
b. If Code 51 flashes or the "Check Engine" light remains on, see Sheet 2 of the PROM installation instructions. Do not go on with this procedure until the problem is corrected and Code 12 appears.
5. Remove the jumper lead from the ECM diagnostic connector and complete the ECM installation.
Figure 1 - Vacuum Switching Valve Assembly:
CTA Kit Installation:
1. Connect the short vacuum hose between the black side of the delay valve and the black, inline port of the VSV (Figure 1).
2. Connect the 3-hose end of the vacuum hose assembly to the VSV as follows (Figure 1):
a. The shorter yellow-stripe hose connects to the metal, inline port of the VSV.
b. The longer yellow-stripe hose connects to the yellow side of the delay valve.
c. The white-stripe hose connects to the black, rightangle port of the VSV.
Figure 2 - VSV Assembly fastening Location:
3. Using the existing tapped hole (Figure 2), fasten the VSV assembly to the driver's side strut tower. Tighten the screw securely.
Figure 3 - Hose Connection To The Tee Fitting Near The Manifold:
4. Remove and discard the existing vacuum hose that connects the lower port on the distributor vacuum advance unit to the intake manifold:
a. If the car has air conditioning, the manifold end of the hose is connected to a tee fitting near the manifold (Figure 3).
Figure 4 - Hose Connection To The Manifold Port:
b. If the car does not have air conditioning, the hose is connected directly to the manifold port (Figure 4).
Figure 5:
5. Route the new vacuum hose assembly beneath the air cleaner duct. Refer to Figure 5 and connect the new hoses as follows:
a. Connect the white-stripe hose to the lower port on the distributor vacuum advance unit.
b. On cars with air conditioning, connect the yellowstripe hose to the tee fitting near the intake manifold.
c. On cars without air conditioning, connect the yellow-stripe hose to the port on the intake manifold.
6. Use the band supplied with the kit to secure the new vacuum hoses to the air cleaner duct. Do not pull the band too tight or it may crimp the hoses. Secure the new hose assembly to existing vacuum hoses using the new assembly's clips.
Figure 6 - EFE Heater Connector:
7. Locate the EFE heater connector on the passenger's side of the engine compartment and separate the halves (Figure 6).
Figure 7:
8. Plug the double-connector end of the new wiring harness into the EFE heater connectors (Figure 7).
Figure 8 - Single Connector end:
9. Route the new wiring harness behind the engine and underneath the brake master cylinder. Plug the single-connector end of the harness into the VSV (Figure 8).
10. Place the new hose routing label over the original label.
PARTS INFORMATION
Each vehicle requires one kit:
Part No. Description
8-94458-200-0 CTA Kit
Each vehicle also requires one of the following part numbers:
Part No. Description
8-16069-048-0 PROM (manual transaxle
model)
8-16069-045-0 PROM (automatic transaxle
model)
FLAT RATE MANUAL UPDATE INFORMATION
OPER.
OPERATION TASK SPEC. I-MARK I-MARK IMPULSE
NUMBER INSTR. (PF) (JT) (JR)
040899 '86 I-MARK (JT) Install - .8 -
CTA FIELD FIX KIT