Test QD - Introduction
NOTE:
Perform this test when Codes 71, 72 or 78 is displayed or when directed by other test procedure or driveability symptoms. This test is intended to diagnose only the following:
- ECA
- EEC Power Relay
- Harness circuits (GND, VPWR, IGNITION)
NOTE:
The electrical signatures of some aftermarket components may affect driveability of the vehicle.
TEST PIN WIRE COLOR IDENTIFICATION
| Application (Test Pin No.) | Wire Color | |
|---|---|---|
| Pin 20, CASE GND | ||
| 4.0L MA (Ranger) | Black/Orange | |
| All Others | Black | |
| Pin 1, KAPWR | ||
| 5.0L PFI (Bronco, "E" Series & "F" Series), 4.9L, 5.8L, 7.3L Diesel, & 7.5L "E" Series | Black/Orange | |
| 2.3L (Ranger), 2.9L (Bronco II & Ranger) & 4.0L (Ranger) | Yellow/Black | |
| All Others | Yellow | |
| Pin 40 or 60, PWR GND | ||
| 4.9L, 5.0L, 5.8L, (Bronco & F-Series), 7.3L Diesel & 7.5L (F-Series) | Black/White | |
| All Others | Yellow | |
| Pin 37 or 57, VPWR | Red | |