CAM SPEED/TIMING NEGATIVE CAM SPEED/TIMING POSITIVE ENGINE COOLANT TEMPERATURE ENGINE INTAKE MANIFOLD AIR TEMPERATURE ENGINE FUEL TEMPERATURE ENGINE TEMPERATURE SENSOR COMMON INPUT SENSOR COMMON #4 INPUT SENSOR COMMON #3 ENGINE TIMING CALIBRATION PROBE POSITIVE ENGINE TIMING CALIBRATION PROBE NEGATIVE INPUT #16
P1 J1 NOTE C: "SINGLE" WINDING MAGNETIC PICKUP SENSOR RECOMMENDED NOTE E: THE ECM SPEEDOMETER AND TACHOMETER OUTPUT SIGNAL LINE VOLTAGES ARE ZERO-CROSSING SQUARE WAVES. THE SPEEDOMETER SIGNALS AT J1-37 AND J1-36 ARE COMPLEMENTS OF EACH OTHER. THE TACHOMETER SIGNALS AT J1-38 AND J1-39 ARE COMPLEMENTS OF EACH OTHER. FOR SPEEDOMETERS WITH A SINGLE SIGNAL INPUT TERMINAL, EITHER ONE OF THE TWO SIGNAL OUTPUT LINES FROM THE ECM MAY BE USED.
NOTE J: ENGINE BLOCK MUST HAVE A DIRECT WIRE CONNECTION TO BATTERY(-). THIS CONNECTION CAN BE MADE AT THE STARTER(-) TERMINAL OR MAINFRAME GROUND LUG
ECM GND STRAP
NOTE L: SENSOR COMMON CONNECTION FOR INPUTS #1 THROUGH #8 AND #11 MAY BE MADE TO EITHER J1-5 OR J1-18 J1-18 IS FOR BODY BUILDER/AFTERMARKET INSTALLATIONS
TO ECM MOUNTING BOLT
ALL SWITCHES ARE SHOWN IN THE OFF POSITION UNLESS OTHERWISE SPECIFIED: ALL WIRES TO BE 18 AWG OR LARGER SAE J1128 TYPE SXL OR EQUIVALENT. FOR TWISTED PAIR SPECIFICATION SEE SAE J1708
NOTE M: J1922 AND J1939 DATA LINKS MUST BE PROGRAMMED FOR ECM TO INTERACT ON DATA LINK, J1939 MUST NOT BE PROGRAMMED UNLESS USED IF PROGRAMMED WITHOUT PROPER CONNECTION A DIAGNOSTIC CODE WILL RESULT
NOTE F: AN ELECTRONIC SIGNAL MAY BE PROVIDED IN PLACE OF A PASSIVE MAGNETIC SENSOR, THE ELECTRONIC SIGNAL INPUT WILL BE CONNECTED TO THE +SIGNAL PIN. NOTE H: A DASHED LINE INDICATES AN OPTIONAL FEATURE NOT AVAILABLE ON ALL SYSTEMS.
C-10, C-12, 3406E, C-15, and C-16 OEM VEHICLE HARNESS WIRING DIAGRAM CIRCUITS WITHIN THIS AREA ARE RECOMMENDATIONS
TACHOMETER SIGNAL+ NOTE E NOTE H SIGNALCAB DIAGNOSTIC TOOL CONNECTOR
C974-PU
450-YL 451-BR
+BAT. C -BAT. E D F J1587 DL NEGATIVE B E793-BU J1587 DL POSITIVE A E794-YL TO J1939 DATA LINK CONNECTOR TO J1939 DATA LINK CONNECTOR TO J1939 DATA LINK CONNECTOR TO J1922 DATA LINK CONNECTOR TO J1922 DATA LINK CONNECTOR
- 12V+ BATTERY 1
NOTE J
C974-PU C973-GN E718-PK E991-GY G836-WH
C973-GN
COOLING FAN SOLENOID
NOTE H NOTE H
ENGINE BLOCK
14 AWG GXL 14 AWG GXL 14 AWG GXL 14 AWG GXL
20A
SET/RESUME SWITCH C978-BR C979-OR
H795-PK CRUISE CONTROL ON/OFF SWITCH H795-PK
C975-WH
45.5mA MAX
SERVICE BRAKE PEDAL POSITION SWITCH N/C H795-PK (PEDAL RELEASED POSITION)
C992-PU
CLUTCH PEDAL POSITION SWITCH N/C C977-BU
H795-PK (PEDAL RELEASED POSITION)
A/C HIGH PRESSURE SWITCH N/C NOTE H H795-PK E971-GN
LO MED
NOTE H
H795-PK
HI
ENGINE RETARDER SOLENOID ON/OFF SWITCH
LO MED HI
E716-GY ENGINE RETARDER SOLENOID SELECTOR SWITCH
NOTE C NOTE F ACCELERATOR PEDAL SENSOR/SWITCH SENSOR COMMON
+8 V ACCELERATOR PEDAL POSITION SENSOR ACCELERATOR PEDAL POSITION
Description Intake Manifold Temp Sensor Short Circuit Very High Intake Manifold Temp Warning Atmospheric Pressure Sensor Open Circuit Atmospheric Pressure Sensor Short Circuit High Coolant Temp Warning Coolant Temp Sensor Open Circuit Coolant Temp Sensor Short Circuit Very High Coolant Temp Warning Low Coolant Level Warning Coolant Level Sensor Fault Very Low Coolant Level Retarder Solenoid Lo/Hi Open Circuit Retarder Solenoid Lo/Hi Short Circuit Retarder Solenoid Med/Hi Open Circuit Retarder Solenoid Med/Hi Short Circuit Low or Intermittent Battery Power to ECM Outside Air Temp Sensor Open Circuit Outside Air Temp Sensor Short Circuit No Ambient Air Temp Data High Fuel Temp Warning Fuel Temp Sensor Open Circuit Fuel Temp Sensor Short Circuit Engine Overspeed Warning Loss of Engine Crank Sensor RPM Signal Transmission Not Responding Theft Deterrent Enabled Emergency Cranking With Theft Deterrent Enabled J1939 Data Link Fault 5 Volt Supply Above Normal 5 Volt Supply Below Normal Event Recorder Data Lost Brake Switch #1 Fault Brake Switch #2 Fault J1922 Data Link Fault Incorrect Engine Software Check Customer or System Parameters Check Transmission Customer Parameters Truck Manufacturer Parameter Not Programmed
