PleasureCraft Engine Group 5.0L, Diagnostic Manual

Page: 326 / 337

7 - 30 Symptoms 5.0/5.7/6.0/8.1L
MEFI 4 - PCM
Cylinder 1 2 3 4 5 6
1st Reading 296 kPa (43 psi) 296 kPa (43 psi) 296 kPa (43 psi) 296 kPa (43 psi) 296 kPa (43 psi) 296 kPa (43 psi)
2nd Reading 131 kPa (19 psi) 117 kPa (17 psi) 124 kPa (18 psi) 145 kPa (21 psi) 131 kPa (19 psi) 130 kPa (19 psi)
Amount of drop 165 kPa (24 psi) 179 kPa (26 psi) 172 kPa (25 psi) 151 kPa (22 psi) 165 kPa (24 psi) 166 kPa (24 psi)
Acceptable Range
Average ±10 kPa: Faulty injector- Faulty injector-
86±10 kPa Injector OK too much Injector OK too little Injector OK Injector OK
76-96 kPa fuel drop fuel drop
(12 psi ± 1.5 psi
11-14psi)
POS
NEG
FUEL INJECTOR
TESTER
LOW VEHICLE BATTERY
READY TO TEST
TEST IN PROGRESS
AMPERAGE SUPPLY SELECTOR SWITCH
Coil Test
4 amp
2.5 amp
0.5 amp
Balance Test
4 amp
0.5-2.5
amp
PUSH TO START TEST
-
+
INJECTOR
CONNECTOR
FUEL PRESSURE
GAUGE
FUEL INJECTOR
TESTER J 39021 VEHICLE BATTERY
(INITIAL PRESSURE)
1st
READING
2nd
READING
(PRESSURE AFTER DROP)
RS 22502
Fuel Injector Balance Test
Circuit Description
The Fuel Injector Tester J 39021, the Injector Switch Box
J 39021-210 and the Injector Harness Connector J39021-303
energize the injector for a precise amount of time allowing
a measured amount of fuel into the manifold. This causes
a drop in system fuel pressure that can be recorded and
used to compare each injector. All injectors should be
within the same pressure drop range, the average pressure
drop value for all injectors is ±10 kPa (1.5 psi).