Dodge ram truck 3500 1996 Service Manual page 1243

B R — — — — — _
S E R V I C E P R O C E D U R E S (Continued)
FUEL S Y S T E M 14 - 9
D O PRELIMINARY INSPECTION OF
DISTRIBUTOR CAP, IGNITION
CABLES SPARK PLUGS, A N D
CHECK FOR VACUUM LEAKS,
START VEHICLE, PULL THE
ELECTRICAL CONNECTORS OFF
THE INJECTORS ONE AT A TIME
TO DETERMINE W H I C H CYLINDER
IS N O T FIRING.
REPLACE THE INJECTOR
CHECK POWER FEED A N D
GROUND CIRCUITS BETWEEN
POWERTRAIN CONTROL MODULE
A N D THE INJECTOR CONNECTOR.
REFER TO WIRING SCHEMATIC
FOR COLOR CODES A N D PIN
TERMINAL NUMBERS.
- N O -
TEST THE VEHICLE WITH THE DRB II
SCAN TOOL
REPAIR OR REPLACE THE W I R I N G
HARNESS A S NECESSARY.
REPLACE INJECTOR IF VISUALLY
PLUGGED AT INJECTOR FUEL
INLET.
REPLACE FUEL RAIL IF VISUALLY
PLUGGED OR RESTRICTED AT
INJECTOR DELIVERY COUPLING.
REPLACE INJECTOR
- N O -
TEST THE INJECTOR RESISTANCE
U S I N G A N OHMMETER ACROSS
THE INJECTOR TERMINALS W I T H
THE INJECTOR CONNECTOR
REMOVED.
PLACE A 12 VOLT TEST L A M P
ACROSS THE INJECTOR
ELECTRICAL CONNECTOR
TERMINALS. OBSERVE THE TEST
LAMP WHILE C R A N K I N G THE
ENGINE.
CIRCUIT IS OK. CHECK FOR FUEL
DELIVERY AT SUSPECT INJECTOR
BY R E M O V I N G THE INJECTOR
F R O M THE RAIL A N D OBSERVING
FOR FUEL A N D / O R RESTRICTIONS
I N THE RAIL OR INJECTOR FUEL
INLET.
W I T H INJECTOR REMOVED F R O M
THE FUEL RAIL, CONNECT A 12V
SOURCE TO O N E TERMINAL O N
THE INJECTOR CONNECTOR A N D
A G R O U N D WIRE TO THE OTHER
TERMINAL. THE INJECTOR
SHOULD " C L I C K " EACH TIME THE
G R O U N D WIRE IS CONNECTED
A N D DISCONNECTED TO THE
TERMINAL.
J9314-114
INJECTOR DIAGNOSIS—VEHICLE RUNS ROUGH AND/OR HAS A MISS