Injector Inspection; Fuel Leakage Test - Mazda B-Series 1997 Workshop Manual

FUEL SYSTEM (FOR 2 . 3 ~ 1 3 . 0 ~ 1 4 . 0 ~ )
FT
INJECTOR
If an injector has an open or short, Diagnostic Trouble Code No. P0300, P0301, P0302, P0303, P0304,
- .
PO305 or PO306 is output.
If the circuit is open, the injector will not operate, causing rough idle and misfiring.
If the circuit is shorted, the injector will inject fuel constantly causing a hard start or no start condition.
5BUOF3-150
lnspection (On-vehicle)
1. Warm up the engine and run it at idle (or cranking if it does
not start.)
2.
Listen for the operational sound of each injector with a
I
sound scope.
Note
Compare the operational sound of each injector
because of the difficulty of verifying the sound of
individual injectors.
lnspection (Off-Vehicle)
Caution
Do not remove the injector from the fuel distributor
unless it is necessary.
6BUOFT-210
I
I
MF1047-A 4BUOF3-146
Note
Refer to Section F1 for 2.3L, Section F2 for 3.OL, or
Section F3 for 4.OL for Injector Removal 1 Installa-
tion procedure.
Injector resistance
1. Disconnect the injector connectors.
2. Measure the resistance of the injectors.
Resistance: 11-1 8 ohms (20°C (68°F))
3. If not as specified, replace the injectlor(s).
6BUOFT-211
Fuel leakage test
Warning
Before performing the following operation, release
the fuel pressure in the fuel system to r duc the
possibility of injury or fire. (Refer to pag FT-149.)
1.
Remove the fuel rail assembly from the intake manifold.
2. Connect the fuel lines.
3. Connect the data link connector terminal FP to ground by
using a jumper wire.
4. Turn the ignition switch ON and check for fuel leaks from
injectors.
Fuel leakage: Less than 1 drop I 2 min.
5.
If not as specified, remove the leaking injector and check
the O-rings and fuel rail damage. Replace as necessary.