Timing Fault - Mercury MerCruiser D2.8L D-Tronic Service Manual

EDI DIAGNOSIS
Timing Fault (Timing Advance Regulation)
Scan Code:
Blink Code:
Malfunction Indicator Lamp:
CIRCUIT DESCRIPTION:
Determining the proper fuel injection point (timing) depends on the quantity of fuel, engine
rpm and coolant temperature. The ECM controls the timing using the signal from the number
one instrumented injector and corrects the timing to the nominal timing rate. Adjustment of
pressure is carried out by an electric Timing Solenoid Valve which the ECM operates. When
the actuated timing advance (timing governing) is different from the setpoint (ECM stored
information) advance by more or less than 5°, this error will be set.
A failure in the Timing Fault circuit should set a Scan Code P1230.
51
68
45
23
Page 5E-38
a
b
a - Fuel Injection Pump
b - Timing Solenoid Valve
c - Harness Connector
d - Sensor Ground (–)
e - Battery Supply Voltage (1 of 3)
CKT PIN
Solenoid
Battery Supply Voltage
Battery Supply Voltage
Battery Supply Voltage
P1230
1321
OFF
c
2
1
NAME
SERVICE MANUAL NUMBER 22
ECM
BLU
51
e
RED
68
e
RED RED
45
RED 23 e
75409
90-860074--1 FEBRUARY 2002
d