176
OILING SYSTEM
OILING SYSTEM TESTS
Observe voltage at pin 2.
• Voltage at pin 2 should drop as the oil pump
cycles.
Check the control signal while the Oil Injector test
is running. Set the digital multimeter to the Hertz
(Hz) scale.
• Meter should read approximately 10 Hz.
Results:
• If voltage and control signal readings (Hz) at
pin 2 are within range, the EMM and wiring are
not at fault.
• If voltage at pin 2 is not within range, check volt-
age at pin 1 (white/red wire) of oil pump electri-
cal connector.
Connect positive meter lead to pin 1 (white/red
wire) of oil injection pump electrical connector.
Observe voltage at pin 1.
• Voltage at pin 1 should be approximately 30 V.
Start the engine. Observe voltage at pin 1.
• Voltage at pin 1 should be approximately 55 V.
• If voltage is not within range, refer to Oil Injec-
tion Pump Circuit Resistance Test on p. 176.
• No voltage reading, refer to System Voltage
Test on p. 78.
Oil Injection Pump Circuit
Resistance Test
IMPORTANT: The complete oil injection pump
electrical circuit includes EMM alternator output,
the engine wire harness, the injection pump wind-
ing and connectors, and the oil injector control cir-
cuit of the EMM. Check continuity of all wiring and
connections.
Disconnect the battery cables at the battery.
Use a digital multimeter with appropriate adapter
leads to measure the resistance between pin 23
(blue) of the EMM J1-B connector and pin 1
(white/red) of the oil injection pump connector.
Calibrate the meter to the LOW OHMS scale.
• An infinite reading () indicates an open circuit.
Isolate the faulty component. Check continuity
of wiring, connections, or injection pump wind-
ing. Repair faulty wiring or replace faulty pump.
• For a higher than expected reading, test resis-
tance of the injection pump. If injection pump
resistance reading is within range, injection
pump winding is good. Isolate faulty compo-
nent. Repair faulty wiring or replace faulty com-
ponent and retest.
Oil Injection Pump Circuit Resistance
2 to 3
1. EMM J1-B connector (pin 23)
2. Oil injection pump connector (pin 1)
005443
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