Glow Plug Main Relay (Glow Plug Relay Actuator), If Equipped - Mercury MerCruiser D2.8L D-Tronic Service Manual

EDI DIAGNOSIS

Glow Plug Main Relay (Glow Plug Relay Actuator), If Equipped

Scan Code:
Blink Code:
Malfunction Indicator Lamp:
f
CIRCUIT DESCRIPTION:
The Glow Plug Main Relay (or Actuator) and the Glow Plug Auxiliary Relay are inside the
electrical box of the engine. The ECM determines if, when and for how long a period the glow
plug relays should be activated based on coolant temperature information from the ECT.
This processing by the ECM is done before, during and after the engine is started. It is the
relay that controls the large amount of amperes needed by the glow plugs. Concurrent with
supplying power to half of the engines glow plugs this relay actuates the Glow Plug Auxiliary
Relay which handles current to the remaining glow plugs.
A failure in the Glow Plug Main Relay circuit should set a Scan Code P1635.
50
3
Page 5E-50
BRN
BLU/YEL
b
RED/YEL
30
86
c
b
RED/YEL
87 85
BLU/YEL
a - Engine Main Relay
b - Circuit Breakers
c - Glow Plug Main Relay
d - Glow Plug Auxiliary Relay
e - Engine Harness Connector
f - To Glow Plugs
CKT PIN
ECM controlled Glow Plug Relay Ground (–)
ECM controlled Ground (–) for dash panel Glow Plug Lamp
1635
No recognition by ECM.
OFF
BRN
87
85
d
30 86
BRN
a
SERVICE MANUAL NUMBER 22
BLU/BLK
BLK/YEL
e
NAME
90-860074--1 FEBRUARY 2002
ECM
50
3
75476