LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2003 >> Pickup F150, 4D Pickup, 4.2 2, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing - Bi-Fuel - Gasoline/CNG >> Computerized Engine Controls >> Powertrain Control Module >> Power Circuits

Power Circuits

  1. Ensure ignition is OFF. Using DVOM, check for battery voltage between chassis ground and PCM Keep Alive Memory Power (KAPWR) terminal No. 55. See Fig 1. If battery voltage is present, go to next step. If battery voltage is not present, check for open in KAPWR circuit or fuse No. 2 (5-amp), located in central junction box. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS - F150 article in ELECTRICAL.
  2. Turn ignition on. Using DVOM, check for battery voltage between chassis ground and VPWR at PCM connector terminals No. 71 and 97. If battery voltage is not present, power is not being supplied from PCM power relay. See TEST B: EEC-V POWER RELAY under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.
Fig 1: Identifying Powertrain Control Module Connector Terminals
G96F31315Courtesy of FORD MOTOR CO.
scientia non olet · About LEMON Manuals