Pinpoint Test B: Powertrain Control Module (PCM) Power Relay: Introduction
NOTE:
The IGN START/RUN and ground circuits, or the B+ and VPWR circuits may be reversed in the harness connector. Refer to the appropriate SYSTEM WIRING DIAGRAMS article, Electronic Engine Controls
for schematic and connector information.
This pinpoint test is intended to diagnose the following:
- harness circuits: B+, IGN START/RUN, INJPWRM, ISP-R, PCMRC, VPWR and GND
- PCM power relay (12A646)
- PCM (12A650)
For PCM connector views or reference values, refer to REFERENCE VALUES .
POWERTRAIN CONTROL MODULE (PCM) CONNECTOR PIN REFERENCE CHART
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| Crown Victoria, Grand Marquis, Ranger, Town Car | 170 Pin | B35, B36 | VPWR |
| E-Series 6.8L, F-Series Super Duty | 170 Pin | E23 B35, B36 B31 B37 |
INJPWRM VPWR ISP-R PCMRC |
| Edge, Flex 4V 3.5L, MKS 3.7L, MKT 3.7L, MKX, Taurus 4V 3.5L | 190-Pin | B33 B51, B52, B53 B7 B8 |
INJPWRM VPWR ISP-R PCMRC |
| Explorer, Explorer SportTrac, Mountaineer | 170 Pin | B35, B36 B46 B37 |
VPWR ISP-R PCMRC |
| Flex GTDI 3.5L, MKS 3.5L, MKT 3.5L, Taurus GTDI 3.5L | 190-Pin | B21 B35, B36, B51 B42 B38 |
INJPWRM VPWR ISP-R PCMRC |
| Fusion 3.5L, MKZ | 140 Pin | B45 B51, B52 B37 B35 |
INJPWRM VPWR ISP-R PCMRC |
| Mustang | 170 Pin | E23 B35, B36 B46 B37 |
INJPWRM VPWR ISP-R PCMRC |
| All other vehicles | 190-Pin | B21 B67, B68 B42 B38 |
INJPWRM VPWR ISP-R PCMRC |