Fuel Injection System
8.41
Engine Monitoring
RESULTS
S Engine Speed: Engine RPM when running or cranking. Use this data to verify Crankshaft Position
Sensor operation.
S Ignition Timing: When in homogeneous mode, this data shows the beginning of ignition in degrees
BTDC or ATDC. During stratified mode, fuel timing leads ignition by one or two milliseconds. This
data indicates the millisecond time delay between the fuel pulse and ignition pulse.
S Spark Duration: T ime duration of ignition spark measured in milliseconds.
S Fuel Timing: Shows the beginning of the EMM pulse to the fuel injector in degrees BTDC or ATDC.
S Fuel Pulse Width: T ime duration of EMM pulse to fuel injector; measured in milliseconds.
S Barometric Pressure: Indicated in Inches of Hg. This data allows EMM altitude compensation.
SWITCHES
S In S.L.O.W.t: YES or NO: YES means engine is in S.L.O.W.t mode. The water temperature
sensor reading can verify this condition. Ground the water temperature switch lead and watch this
value change when engine goes into S.L.O.W.t.
VOLTAGE
Use these readings to verify regulator and charging system operation.
S Alt. 45V: Indicates voltage available to power the ignition and injectors. Slightly less than Alt. 12V
when EMM is first powered up; 39-45 Vdc when engine is running.
NOTE: Most sensors, switches, and voltages will have associated service codes. Refer to the Service Code
Chart in the Diagnostics section of the DI
t Service Manual for a description of the failure and the corresponding
System Check gauge response.
ENGINE MONITORINGRun Time: 12:58:25
EMM On Time: 0:0:46
SENSORS
RESULTS
VOLTS °F °C %OPEN
AIR
WATER
EMM
TPS CAL.
TPS ACT.
ENGINE SPEED
IGNITION TIMING
SPARK DURATION
FUEL TIMING
FUEL PULSE WIDTH
BARO PRESSURE
1.90
2.47
1.25
-
0.33
71
134
100
-
--
-
-
-
-
-
22
57
38
680
RPM
1
ms
5.00
ms
11 °BTDC
5.33
ms
29.61 In HG
0
SWITCHES
VOLTAGES
In S.L.O.W.t
NO
ALTERNATOR 12.8
In Synch.
YES
ENGINE SYNC NO
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