Pinpoint Test VPWR - Vehicle Power
NOTE:
Enter this test only when directed here from another PINPOINT TEST. To prevent replacement of good components, note following non-EEC components may be faulty: ignition switch, alternator, battery cables, ground straps, or voltage regulator. This test is intended to diagnose only ECA, wiring harness circuits, and battery voltage.
VPWR CIRCUIT PIN IDENTIFICATION
| Circuit | ECA Pin | BOB Pin | Wire Color | |
|---|---|---|---|---|
| 1.3L | ||||
| GND | 2A | 39, 40, 44, 60 | BLK | |
| GND | 2B | 20 | BLK | |
| GND | 2C | 16 | BLK | |
| VPWR | 1B | 37, 57 | YEL/BLK | |
| 1.6L | ||||
| GND | 2R | 49 | BLK | |
| GND | 3A | 20 | BLK | |
| GND | 3G | 40 | BLK | |
| VPWR | 3I | 37 | YEL/GRN | |
- Turn ignition off. Install BOB, leaving ECA disconnected. Turn ignition on. Measure voltage between VPWR test pin and battery ground. If voltage is not greater than 10 volts, go to step 3). If voltage is greater than 10 volts, go to next step.
- Measure voltage between VPWR test pin and GROUND test pin. If voltage is greater than 10 volts, go to next step. Repeat measurement for each ECA ground wire. If all voltages are greater than 10 volts, go to PINPOINT TEST VREF . If all voltages are not greater than 10 volts, repair ECA ground wire in question.
- Turn ignition off. Locate main power relay. On Capri, relay is located on left side of engine compartment. On Festiva, relay is located at left front of engine compartment. Disconnect main power relay 4-wire connector. Using jumper wires, connect BATT, PWR, and GND terminals of relay to corresponding trammels on connector. Leave VPWR wire disconnected.
- Turn ignition on. Measure voltage between main power relay VPWR terminal (where VPWR wire was) and ground. If voltage is more than 10 volts, repair VPWR circuit between main power relay and ECA. If voltage is not more than 10 volts, go to next step.
- Unplug main relay connector. Measure voltage between harness connector BATT wire and ground. If voltage is not greater than 10 volts, repair BATT wire from battery to harness connector. If voltage is greater than 10 volts, go to next step.
- Unplug main relay connector. Measure voltage between harness connector PWR wire and ground. If voltage is not greater than 10 volts, repair PWR wire from ignition switch to harness connector. If voltage is greater than 10 volts, go to next step.
- Measure voltage between main power relay BATT wire and main power relay GROUND wire. If voltage is less than 10 volts, repair main power relay ground wire. If voltage is not less than 10 volts, ground circuit is okay; replace main power relay.