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SENR9592-03 December 2002
160-7689
Engine Coolant Temperature Sensor
Inlet Air Heater Relay
Intake Manifold Air Temperature Sensor
P1
Injection Actuation Pressure Control Valve (IAPCV) Integral To Pump
NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED INJECTOR RETURN 6 INJECTOR RETURN 5 INJECTOR RETURN 4 INJECTOR RETURN 3 INJECTOR RETURN 2 INJECTOR RETURN 1 INJECTOR 6 INJECTOR 5 INJECTOR 4 INJECTOR 3 INJECTOR 2 INJECTOR 1 TIMING/CALIBRATION PROBE(-) TIMING/CALIBRATION PROBE(+) PRIMARY SP/TMG SIG PRIMARY SP/TMG SIG + SECONDARY SP/TMG SIG SECONDARY SP/TMG SIG + COOL. TEMP. SNSR PASSIVE SNSR COMMON ANALOG SNSR POWER (+5V) ANALOG SNSR COMMON TURBO OUTLET PRESS. SNSR ATMOSPHERIC PRESS. SNSR ENG OIL PRESS. SNSR FUEL PRESSURE INTAKE MANIF. AIR TEMP. SNSR INJ. ACTUATION PRESS. SNSR IAP CONTROL VALVE + IAP CONTROL VALVE (MIDDLE) ENGINE OIL TEMP. SNSR (END) ENGINE OIL TEMP. SNSR ENG OIL PRESS. SNSR (+5V) ENG OIL PRESS. SNSR (RTN)
NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED
OIL GRADE RETURN OIL GRADE CODE 2 OIL GRADE CODE 1 NOT USED NOT USED IAH RELAY RETURN INLET AIR HEATER
+BAT. (SWITCHED) -BAT. CAT DATA LINK CAT DATA LINK +
SENR9592-03
ELECTRONIC CONTROL MODULE (ECM)
14 AWG CB (NOTE D)
229/BK 229/BK
NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED PWM OUTPUT 3 TACHOMETER +BAT.(UNSWITCHED) AIR SHUTOFF SOLENOID SOLENOID COMMON AUXILIARY TEMP SNSR COOLANT LEVEL SNSR DIG SNSR PWR (+8V) DIG SNSR RETURN AUXILIARY PRESS. SNSR THROTTLE POSITION SNSR ANLG SNSR PWR (+5V) ANLG SNSR RETURN ETHER START VALVE RELAY STARTING AID OVERRIDE SW MAINTENANCE DUE RESET SW TORQUE LIMIT SW REMOTE SHUTDOWN SW INTERMEDIATE ENG. SPEED SW OVERSPEED VERIFY SW PTO INTERRUPT SW PTO ENABLE SW 1.5A DIGITAL OUT 4 HS PTO RAMP UP SW PTO RAMP DOWN SW MAINTENANCE DUE LAMP DIAGNOSTIC LAMP WARNING LAMP TACHOMETER + +BAT. (SWITCHED) CAT DATA LINK CAT DATA LINK + -BAT. PASSIVE/ACTIVE ANLG 8 +BAT.(UNSWITCHED) +BAT.(UNSWITCHED) SWITCH INPUT 5 SWITCH INPUT 11 SWITCH INPUT 10 J1939 SHIELD J1939 DATA + J1939 DATA -BAT. -BAT.
(+) BATTERY SUPPLY WIRES INPUT SIGNAL WIRES TO ECM OUTPUT SIGNAL WIRES FROM ECM SENSOR SUPPLY VOLTAGE +24V - BAT. US/METRIC SCROLL FORWARD CAT DATA LINK CAT DATA LINK + NOT USED WARNING LAMP WARNING BACKLIGHT LAMP PWR SCROLL BACKWARD
SIGNAL PLUS
1 2 3 4 5 6 7 8 9 10 11 12
SIGNAL MINUS (NOTE H)
(-) BATTERY / SENSOR RETURN -V OUT
+V OUT
DC/DC CONVERTER (127-8853) (NOTES B & L) -V IN
+V IN
(NOTE B)
CAT DATA LINK + CAT DATA LINK -BAT. +BAT. (SWITCHED)
NOTE G: ONE MAIN EMS MODULE IS REQUIRED FOR EACH DESIRED MONITORING STATION. THE TACHOMETER AND/OR QUAD GAUGE UNITS ARE OPTIONAL AND WILL NOT OPERATE WITHOUT CONNECTION TO A MAIN EMS MODULE
NOTE A: THE CUSTOMER CONNECTOR BRACKET GROUND STUD MUST HAVE A DIRECT WIRE CONNECTION TO BATTERY (-). THIS CONNECTION CAN BE MADE AT THE STARTER (-) TERMINAL NOTE B: REFER TO THE ELECTRONIC INSTALLATION GUIDE FOR ADDITIONAL INSTALLATION DETAILS NOTE C: MAXIMUM LENGTH OF DATA BUS (TERMINATION RESISTOR TO TERMINATION RESISTOR) IS 40 METERS
NOTE H: THE DEFAULT SETTING FOR THE EMS IS METRIC UNITS. IF METRIC UNITS ARE REQUIRED, NO CONNECTION IS NEEDED. IF U.S. UNITS ARE REQUIRED, A PERMANENT CONNECTION TO BATTERY (-) IS REQUIRED
NOTE D: PLACE APPROPRIATE CIRCUIT PROTECTION NOTE E: USE RECOMMENDED CABLE OR EQUIVALENT PER SAE J1939 SPECIFICATIONS FOR ALL J1939 DATA LINK CONNECTIONS NOTE F: PIN 22 ON THE EMS MAIN MODULE 40 PIN CONNECTOR MUST BE CONNECTED TO BATTERY (-) FOR PROPER OPERATION
NOTE K: WHEN THE SHUTDOWN SWITCH IS CONNECTED TO BATTERY (-) THE ECM DISABLES THE FUEL INJECTION SIGNAL. THIS ACTION CAUSES THE ENGINE TO SHUTDOWN WHILE LEAVING THE ECM POWERED TO MONITOR ENGINE DIAGNOSTICS NOTE L: 12 VOLT BATTERY SYSTEMS MUST USE THE DC/DC CONVERTER FOR THE EMS TO OPERATE PROPERLY. 24 VOLT SYSTEMS SHOULD CONNECT SWITCHED BATTERY DIRECT TO PINS 1 & 2 ON THE 12 PIN EMS HARNESS CUSTOMER CONNECTOR
(NOTES B & L)
NOTE U: WHEN CHANGING OIL GRADES, THE OPERATOR MUST ENSURE THAT THE CORRESPONDING PLUG IS INSERTED INTO THE WIRING HARNESS. FOR MORE INFORMATION REFER TO THE OPERATION AND MAINTENANCE MANUAL.
ABBREVIATION ALT ALTERNATOR ATA AMERICAN TRUCKING ASSOCIATION CB CIRCUIT BREAKER CIS CUSTOMER IGNITION SWITCH DIG DIGITAL ECM ELECTRONIC CONTROL MODULE N/C NO CONNECTION PWM PULSE WIDTH MODULATION SM STARTING MOTOR SMMS START MOTOR MAG SWITCH
NOTE V: ARC SUPPRESSION DIODES ARE REQUIRED ON RELAY COILS AND SOLENOID COILS. NOTE W: WIRING FOR DESIRED SPEED CONTROL DETERMINED BY APPLICATION. FOR DESIRED SPEED CONTROL OPTIONS, REFER TO THE ELECTRONIC INSTALLATION GUIDE. NO ADDITIONAL CONNECTIONS ARE ALLOWED TO ANY WIRES WITHOUT CATERPILLAR ENGINEERING APPROVAL
WIRE CODE
UNLESS OTHERWISE SPECIFIED: ALL WIRES TO BE 16 AWG OR LARGER SAE J1128 TYPE SXL OR EQUIVALENT. FOR TWISTED PAIR SPECIFICATION SEE SAE J1708
CUSTOMER SUPPLIED WIRING
ELIMINATION OF ANY COMPONENTS SHOWN WILL DISABLE CERTAIN ENGINE FEATURES. CONTACT CATERPILLAR ENGINEERING WHEN CONSIDERING COMPONENT REMOVAL
¹ The CID is a diagnostic code that indicates which circuit is faulty. ² The MID is a diagnostic code that indicates which electronic control module diagnosed the fault.
¹The FMI is a diagnostic code that indicates what type of failure has occurred.
Related Electrical Service Manuals Title
Form Number
Electronic Troubleshooting
SENR9593
Systems Operation / Testing and Adjusting
SENR9598
Electronic Installation Guide
REHS0871
THIS SCHEMATIC IS FOR THE C-9 INDUSTRIAL ENGINE (S/N: CLJ)