14 - 58
FUEL
SYSTEM
• INJECTOR DIAGNOSIS-VEHICLE RUNS ROUGH AND/OR HAS A
MISS
DO PRELIMINARY INSPECTION OF DISTRIBUTOR CAP,
IGNITION
CABLES
SPARK
PLUGS,
AND
CHECK
FOR VACUUM
LEAKS.
START VEHICLE, PULL THE
ELECTRICAL
CONNECTORS OFF
THE INJECTORS ONE AT A TIME
TO DETERMINE
WHICH
CYLINDER
IS
NOT FIRING.
REPLACE
THE INJECTOR -NO •
CHECK
POWER FEED AND
GROUND CIRCUITS BETWEEN POWERTRAIN CONTROL MODULE
AND THE INJECTOR CONNECTOR.
REFER
TO WIRING SCHEMATIC
FOR COLOR CODES AND PIN
TERMINAL NUMBERS. - NO-
YES
TEST THE VEHICLE
WITH
THE DRB II
SCAN
TOOL
NO
REPAIR
OR REPLACE THE WIRING
HARNESS
AS NECESSARY.
REPLACE
INJECTOR IF VISUALLY
PLUGGED
AT INJECTOR FUEL INLET.
REPLACE
FUEL RAIL IF VISUALLY
PLUGGED
OR RESTRICTED AT INJECTOR DELIVERY COUPLING. -NO
REPLACE
INJECTOR •NO-TEST THE INJECTOR RESISTANCE
USING AN OHMMETER
ACROSS
THE INJECTOR TERMINALS
WITH
THE INJECTOR CONNECTOR
REMOVED.
PLACE
A 12
VOLT
TEST LAMP
ACROSS
THE INJECTOR
ELECTRICAL
CONNECTOR
TERMINALS.
OBSERVE THE TEST LAMP WHILE CRANKING THE
ENGINE.
CIRCUIT IS OK. CHECK FOR FUEL DELIVERY AT SUSPECT INJECTOR
BY
REMOVING THE INJECTOR FROM THE RAIL AND OBSERVING
FOR FUEL AND/OR RESTRICTIONS IN THE RAIL OR INJECTOR FUEL INLET.
WITH
INJECTOR REMOVED FROM
THE FUEL RAIL, CONNECT A 12V
SOURCE
TO ONE TERMINAL ON
THE INJECTOR CONNECTOR AND
A
GROUND WIRE TO THE OTHER
TERMINAL. THE INJECTOR SHOULD "CLICK" EACH TIME THE GROUND WIRE IS CONNECTED
AND DISCONNECTED TO THE TERMINAL.
J9314-114
