Engine - No Start/Lack of Power On Acceleration

87ford25

Article No. 87-25-9

^ NO START - ENGINE WILL NOT CRANK - 1.9L CFI - VEHICLES BUILT BEFORE 11/01/87

^ LACK OF POWER ON ACCELERATION - 1.9L CFI - VEHICLES BUILT BEFORE 11/01/87

FORD: 1988 ESCORT

CALIBRATIONS: 8-07F-RO, 8-07A-RO, 8-08A-RO

ISSUE: No start or lack of power on acceleration may be caused by a damaged EEC IV processor. A voltage spike from the fuel pump wire harness may damage the power supply in the EEC IV processor. The damaged processor can drain the vehicle's battery or cause the processor to go into limited operation strategy (LOS) (processor default).

ACTION: To correct this, install a diode jumper wire harness in the fuel pump wire harness and install a new EEC IV processor. Refer to the following service procedure.

1. Remove the bottom of the rear seat from the vehicle by flipping the seat bottom up and removing the hinge bolts and canvas strap. For vehicles with split rear seats, both seat bottoms will need to be removed to make the diode installation easier.

2. Remove screws from the bottom left hand quarter trim panels in the rear seat area. Tilt the rear seat back(s) slightly forward and grab the edge of the carpeting underneath the rear seat back. Pull the carpeting from the rear seat toward the back of the front seat until connector (C102) can be clearly seen.

FIGURE 8:

3. Disconnect connector C102, Figure 8.

4. Install diode jumper (E8FZ-14A411-A) between C102 connector halves, Figure 8.

5. Secure locator on diode jumper to floor pan hole where connector C102 was previously located. Pull all harness slack towards left hand side of car and coil the extra harness and tape it.

6. Restore carpeting to original position and reinstall rear seat(s).

NOTE: After installing the diode jumper, test the EEC IV processor to determine if the power supply inside the processor was damaged.

7. Make sure the ignition key is in the "Off" position.

8. Wait ten (10) seconds for the EEC IV time relay to time out.

FIGURE 9:

9. Disconnect the EEC IV power ground bullet connector (C160) from under the hood and measure the current draw with a digital voltohmmeter, Rotunda No. 007-00001, Figure 9.

10. If the current draw is greater than 20 milliamps, install a new EEC IV processor. Refer to the EEC IV processor application chart below for the correct part number.

NOTE: Because of the EEC IV processor power disconnect it will be required to go through the processor adaptive idle learning cycle.

Calibration EEC IV Processor

8-07F-RO E8FZ-12A650-BA
8-07A-RO E8FZ-12A650-EA
8-08A-RO E8FZ-12A650-FA

11. If the current draw is less than 20 milliamps the processor has not been damaged and the diode jumper will protect the processor in the future.

PART NUMBER PART NAME CLASS

E8FZ-14A411-A Diode Jumper Wire B
E8FZ-12A650-BA EEC IV Processor B
E8FZ-12A650-EA EEC IV Processor B
E8FZ-12A650-FA EEC IV Processor B

OTHER APPLICABLE ARTICLES: 86-9-11
WARRANTY STATUS: Eligible Under Emission Warranty Coverage
OPERATION: SP872509A - Install diode jumper, test EEC IV processor and perform Quick Test
TIME: 1.0 Hr.

OPERATION: SP872509B - Install diode jumper, test EEC IV processor, install new EEC IV processor and perform Quick Test
TIME: 1.4 Hrs. DLR. CODING: Basic Part No. 12A650 - Code: 46