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11.
Engine Diagnostics and Codes
4. Fuel Pump Relays
provide 12 volts at 1C
and 1G to Fuel Feed Pumps
Start Sequence 3
• Momentarily turn Key Switch to Start. ECM receives crank request
on pin J2-22.
Start Contact On
• ECM pin J1-63 supplies 12 volts to Bussmann 3F which energizes
Starter Relay.
• Starter Relay then provides 12 votls to Bussmann 3H which in turn
energizes Start Solenoid. Engine cranks.
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"Bussmann" Connector #1 (Black)
3. ECM provides 12 volts to 1E
and 1F. Energizes Fuel Feed
Pump Relays
5. ECM supplies 12 volts to 3F.
Energizes Starter Relay.
6. 3H provides 12 volts
to Starter Solenoid. Engine
D
C
B
E
F
G
"Bussmann" Connector #3 (Blue)
D
E
cranks.
A. Auxiliary Relay
B. Auxiliary Relay Control
C. Fuel Feed Pump 2
D. Powertrain Relay
Contacts - J1-73
E. J1-44 Fuel Pump 1 Relay Control
A
F. J1-50 Fuel Pump2 Relay Control
G. Fuel Feed Pump 1
H. Plug
H
C
B
A
F
G
H
Starter Relay Control: 12 volts + from
A. B+ to DLC
B. J1-72 Powertrain Relay Control
C. Plug
D. Plug
E. Plug
F. J1-63 Starter Relay Control
G. Ground
H. Starter Solenoid
ECM in Neutral
33
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