Failure Mode Identifiers (FMI)¹ Failure Description Data valid but above normal operational range. Data valid but below normal operational range. Data erratic, intermittent, or incorrect. Voltage above normal or shorted high. Voltage below normal or shorted low. Current below normal or open circuit. Current above normal or grounded circuit. Mechanical system not responding properly. Abnormal frequency, pulse width, or period. Abnormal update. Abnormal rate of change. Failure mode not identifiable. Bad device or component. Out of calibration. Parameter failures. Parameter failures. Parameter not available. Module not responding. Sensor supply fault. Condition not met. Parameter failures.
¹The FMI is a diagnostic code that indicates what type of failure has occurred.
Monitoring System Service Modes Service Mode
Number
Operator Mode Sequence
0
Harness Code
1
Numeric Readout
2
Service
3
Digital Tattletale
4
Units
5
Permanent Load Count
6
Calibration (Transmission Control)
7
Wire Description Wire Number
Description Power Distribution Circuits Bat (+) Hd Lmp Stoplamp/Domelamp Key Sw Alt Output (+) Term. Main Power Rly Output Opr Mon Panel Wiper Converter Back Alarm To Lamp Air Dryer Gauges A/C Xmsn Ctrl Cigar Lighter 12V Pwr Secondary Steering Secondary Steering Motor Pwr Payload Mon Aux Ckt/Pre-Lubr Aux Ckt Start Aid Bat (+) Turn Sig Brake Cont Pwr Window Ground Circuits Main Chassis Operator Monitor Return XMSN Ctrl Bat (-) XMSN SW Payload Mon - Customer Gnd Payload Mon - System Gnd Cat Mon Sys Ident Code 0 Cat Mon Sys Ident Code 1 Cat Mon Sys Ident Code 2 Cat Mon Sys Ident Code 3 Cat Mon Sys Service Cat Mon Sys Clear ARC Basic Machine Circuits Starter Relay No. 1 Output Starter Relay Coil Key SW Main Power Relay Coil Starter Relay No. 2 Output Start Aid Relay To Start Aid Sol Backup Alarm Lamp Warning Horn (Forward) Prelubr Pushbutton SW To Prelubr Timer Monitoring Circuits Alternator (R) Term. Opr Mon System Air Press. Opr Mon Action Alarm Opr Mon Master Action Lamp Opr Mon Cool Flow Primary Steering Press. SW Opr Mon Power Train Oil Filter Brake Oil Temp Gauge Fuel Level Gauge Tach Sender (+) Torque Converter Retarder Indicator Lamp Secondary Steering Motor Indicator Overstroke SW Converter Temp SW To Brake Oil Temp SW VIMS Display Data VIMS Display Load Left Rear Brake Oil Pressure Right Rear Brake Oil Pressure Body Up Indicator Accessory Circuits Wiper - Front (Park) Wiper - Front (Low) Wiper - Front (HI) Washer - Front Radio Speaker - Left Radio Speaker - Left (Commom) Radio Speaker - Right Radio Speaker - Right (Common) A/C Compressor/Refrigerant Pressure SW Blower Motor (HI) Blower Motor (Medium) Blower Motor (Low) Hazard Flasher To SW Opr A/C SW To Thermostat/Fuse A/C SW To Refrigerant SW A/C Clutch To Thermostat SW Turn Signal SW To Flasher Wiper - Aux (Park) Wiper SW To Intermittent Module Intermittent Module To Wiper Motor Mg Snow Plow Sol DC/DC Converter Memory Output Power Window Up Lighting Circuits Dome Lamp Stop Lamp Turn Lamp - Left Turn Lamp - Right Head Lamp Basic Head Lamp Hi Backup Lamp Park/Tail/Dash Lamp Head Lamp Lo Payload Mon Red Lamp Payload Mon Green Lamp Tachometer Lamp - Cat Mon Sys Speedometer Lamp - Cat Mon Sys Gauge Lamps - Cat Mon Sys Light SW to High Beam Relay Control Circuits TCS Test SW XMSN Up Sol XMSN Down Sol XMSN Lockup Clutch Sol Basic XMSN Retarder SW XMSN Bed Raise SW Sensor Power Supply
Wire Color GN BR WH OR YL GN BU PU BR WH OR YL GN BU GN BU WH BU GN GY YL BR WH OR GY PU BR GN BU GY PU BR PK GY YL GN PK PU PU PK BU YL YL GN BR BU BR GN GY OR PK WH YL BU BR OR PK PU WH YL BU BR GN GY OR PK PU WH YL BU BR GN PK YL GN PK BR BU PU GY OR WH BR GY BU GY YL PK PU BU BR GY PK PU BU BR GN BR YL WH BR GY BU GN OR BR WH BU OR BU BR GY BR PK WH BU OR PU GN YL
Control Circuits XMSN Speed Pickup Signal XMSN Lever Code 1 XMSN Lever Code 2 XMSN Lever Code 3 XMSN Lever Code 4 XMSN Lever Code 5 XMSN Lever Code 6 XMSN Brake SW XMSN Gear Code 1 XMSN Gear Code 2 XMSN Gear Code 3 XMSN Gear Code 4 XMSN Gear Code 5 XMSN Gear Code 6 Secondary Steering Motor Relay Secondary Steering Cont SW TCS Pickup Power Wheel Speed Pickup Left Wheel Speed Pickup Right TCS Servovalve TCS Sol - Left TCS Sol - Right Sensor Power Digital Sensor Power Injector #1 Injector #2 Injector #3 Injector #4 Injector #5 Injector #6 Injector #7 Injector #8 Turbo Outlet Pressure Atmospheric Pressure After Cooler Temp VIMS Display +V VIMS Display Clock Cat Mon Sys Tack/Serv Mtr/Odometer Select Body Position Sensor Signal XMSN Cntl Sol Return #2 ATA Data Link ATA Data Link + Crankcase Press Oil Press (Unfiltered) PWM #1 And #2 Return PWM #1 Out (3.5A) PWM #2 Out (3.5A) Throttle Lh Turbine Inlet Exh Temp Rh Turbine Inlet Exh Temp Dout 6 Start Aid Current Level Relay Dout 3 Dout 2 Start Aid On Relay Left Turbo Inlet Press Right Turbo Inlet Press Shutdown (NO) Shutdown (NC) SW 4 SW 5 SW 6/1 SW 8/3 SW 9/4 SW 10/5 TDC Probe + TDC Probe Fuel Press Injector Common 1 & 3 Injector Common 2 & 4 Injector Common 5 & 7 Injector Common 6 & 8 Backup Camshaft Spd/Tmg Body Raise Sol Body Lower Sol Lever Position Switch/Sensor Return #1 Switch/Sensor Return #2 Switch/Sensor Return #3 Switch/Sensor Return #4 Secondary Steer Motor Relay Exhaust Diverter Switch Serial Data (Transmit) Serial Data (Receive) Transmit Key Payload Mon Right Front Sensor Payload Mon Left Front Sensor Payload Mon Right Rear Sensor Payload Mon Left Rear Sensor Payload Mon Transmit LCD Out Payload Mon Clock LCD Out Payload Mon Latch LCD Out Payload Mon Test/Set Payload Mon MODE Neut Start Cont To Payload Mon System VIMS Start Mod Right (-) Port/CAT Data Link (-) VIMS Start Mod Right (+) Port/CAT Data Link (+) XMSN Sol No. 2 Return Relay Logic Diverter Sol Analog Sensor Common Oil Pressure (Filtered) Coolant Temperature Engine Speed/Timing Sensor Power Analog Sensor Power Digital Sensor Return Primary Camshft Speed/Timing +8V VIMS - Sensor +8V Supply Solenoid Return 1 Sol Return 3 Start Aid Timer Output Auto Retard On SW Auto Retard Off SW Auto Retard Air Cont Valve Auto Retard AIr Supply Valve Auto Retard Press SW Auto Retard Manual Retard SW Brake Oil Diverter Temp SW To Solenoid Aux Lamp Driver 1
Normally open switch that will close with an increase of a specific condition (temp-press-etc.). The circle indicates that the component has screw terminals and a wire can be disconnected from it.
88 94
95
Normally closed switch that will open with an increase of a specific condition. No circle indicates that the wire cannot be disconnected from the component.
87 61 63 64 65
86
67
90 91
93
92
This indicates that the component has a wire connected to it that is connected to ground.
57
67 53
85 70
This indicates that the component does not have a wire connected to ground. It is grounded by being fastened to the machine.
60 68
56
59 58
52
69
55
84
83
54
Area B: Rear Compartment
Reed Switch - A switch whose contacts are controlled by a magnet. A magnet closes the contacts of a normally open reed switch; it opens the contacts of a normally closed reed switch.
Area D: Left Side Wall of Rear Compartment
777D HHA Off Highway Truck Electrical System
Sender - A component that is used with a temperature or pressure gauge. The sender measures the temperature or pressure. Its resistance changes to give an indication to the gauge of the temperature or pressure.
T
Relay (Magnetic Switch) - A relay is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close the switch part of the relay.
AGY1-UP
Solenoid - A solenoid is an electrical component that is activated by electricity. It has a coil that makes an electromagnet when current flows through it. The electromagnet can open or close a valve or move a piece of metal that can do work.
110
78
Harness And Wire Symbols 109
108
106 77
107
76
* * AG-C3 C-C4 130-6795 130-6795
105
72
81
* Harness identification letter(s) and a serializing code. The "C" stands for connector and the number indicates which connector in the harness.
Harness identification code This example indicates wire 135 in harness "AG".
79
71
325-A135 PK-14
104
Wire, Cable, or Harness Assembly Identification Part Number For L-C12* AG-C4* Connector Assembly 3E-5179 111-7898 325-A135 PK-14 1
80
73
82
103
Area G: Right Side Wall of Raer Compartment
75
Socket
Pin
Single Wire Connector
74
Area F: Front Compartment
Wire Gauge
Wire Color
Ground Circuit Connection Number Identification
Receptacle
1 2
Typical representation of a Deutsch connector. The plug contains all sockets and the receptacle contains all pins.
2
200-L32 BK-14
1 2
Typical representation of a Sure-Seal connector. The plug and receptacle contain both pins and sockets.
The connectors shown in this chart are for harness to harness connectors. Connectors that join a harness to a component are generally located at or near the component. See the Component Location Chart.
Machine Location 17 32 19 18 16 26 20 32 22 21 23 27 A A 24 10 25 28 B-53 F-82 F-81 12 12 24 30 A 15 11 8 32 34 30 35 B-70 15 B-58 D-97 28 B-70 E F-80 E A 24 42 E C C 37 113 A 38 C 28 39 111 A A E E 114 F-75 B-54 E B-55 E 40 B-56 E F-73 E B-56 41 42 A
Component Ground Speed Sensor Throttle Position Sensor System Voltage Engine Output Speed (EOS) Signal CAT Data Link Sensor Supply Voltage Parking Brake Switch TCS Left Brake Solenoid TCS Right Brake Solenoid Transmission Gear Position Sensor Transmission Output Speed Sensor Transmission Shift Lever Position Sensor Brake System Pressure Switch ARC Supply Solenoid ARC Control Solenoid ARC Lamp Operator ARC On/Off Switch ARC Pressure Switch Retarder Pressure Switch TCS Proportional Solenoid TCS Lamp Machine Application Left Rear Park Brake Pressure Sensor Right Rear Park Brake Pressure Sensor Location Code Incorrect
¹The CID is a diagnostic code that indicates which component is faulty. ²The MID is a diagnostic code that indicates which electronic control module diagnosed the fault.
Part No. 124-6704
Resistor, Sender and Solenoid Specifications Component Description Resistor: Start Aid
125-9740
Resistor: Blower Motor
139-8667 101-3430
Sender: Fuel Level
Solenoid: Exhaust Diverter Body Lower 112-5874 Solenoid: Body Raise 124-3497 Solenoid: Fan Clutch Down Shift 144-6292 Solenoid: Lockup Up Shift 3E-2273 Solenoid: Brake Oil Diverter ARC Control 3E-8691 Solenoid: ARC Supply 3T-0062 Solenoid: Proportional 7T-9074 Solenoid: Air Horn 9G-9988 Solenoid: Four Way ¹ At room temperature unless otherwise noted.
Actuate 45 kPa MAX (6.5 psi MAX) 60 kPa MAX (8.7 psi MAX) 275 to 1750 kPa¹ (40 to 254 psi) 80.0 kPa MAX (11.6 psi MAX) 137.9 ± 13.8 kPa (20.00 ± 2.00 psi) 517 ± 35 kPa (75.0 ± 5.1 psi) 362 ± 29 mN (1.30 ± 0.1 oz) At Point X 80.0 kPa MAX (11.6 psi MAX) -1.1 ± 0.8°C (30 ± 1.4°F) 38.0 ± 3.0°C (100 ± 5.4°F) 1200 kPa MAX (174.0 psi MAX) 210 ± 70 kPa (30.5 ± 10 psi)
Deactuate 5 kPa MIN (0.7 psi MIN) 28 ±15 kPa (4.1 ± 2.2 psi) 55 ± 20 kPa (8.0 ± 2.9 psi) 82.7 kPa MIN (12.0 kPa MIN) 448 ± 35 kPa (65.0 ± 5.1 psi) 303 mN MIN 1.09 oz MIN At Point X 55 ± 20 kPa (8.0 ± 2.9 psi) 2.2 ± 0.8°C (36 ± 1.4°F) 27°C MIN (81°F MIN) 700 ± 100 kPa (102 ± 14.5 psi) -
Truck Payload Measurement System (TPMS) Circuit Description Suspension cylinder charge Suspension cylinder charge Suspension cylinder charge Suspension cylinder charge Left front suspension cylinder pressure sensor circuit Right front suspension cylinder pressure sensor circuit Left rear suspension cylinder pressure sensor circuit Right rear suspension cylinder pressure sensor circuit Battery backup / real time clock setting System setting / memory Green light open circuit or ground short circuit Green light (+) battery short circuit Red light open circuit or ground short circuit Red light (+) battery short circuit
Contact Position
Monitoring System Operator Modes
Normally Open
Operator Mode
Number
Service Meter Odometer Tachometer Resettable Load Counter Diagnostic Scrolling
Normally Open Normally Open
1 2 3 4 5
Normally Closed Normally Closed Normally Open Normally Open Normally Closed Normally Open Normally Closed A-C Normally Closed A-B Normally Open Normally Open
¹ With increasing pressure the closed condition can be maintained up to 2800 kPa (406 psi), with decreasing pressure the closed condition can be maintained down to 170 kPa (25 psi).
Related Electrical Service Manuals Title Form Number Alternator: 30-SI Series SENR7508 Caterpillar Monitoring System SENR6717 Troubleshooting 3500B Engines for Caterpillar SENR1128 Built Machines Integrated Brake Control SENR1503 Payload Monitoring System SENR4733 Power Train Electronic Control System RENR2668 Starting Motor: 50MT Series SENR3860
105-9344 Component Part Number
Printed in U.S.A.
Off Machine Switch Specification Part No.
Fuse
Plug
Pin or Socket Number
Cylinder 1 Injector Solenoid Cylinder 2 Injector Solenoid Cylinder 3 Injector Solenoid Cylinder 4 Injector Solenoid Cylinder 5 Injector Solenoid Cylinder 6 Injector Solenoid Cylinder 7 Injector Solenoid Cylinder 8 Injector Solenoid Throttle Sensor Output Filtered Oil Pressure Crankcase Pressure Signal Coolant Temperature Battery Voltage Engine RPM Signal CAT Data Link Personality Module ECM Timing Calibration Analog Sensor Supply Digital Sensor Supply Shutdown Inputs System Parameters Turbocharger Outlet Pressure Atmospheric Pressure Right Turbocharger Inlet Pressure Left Turbocharger Inlet Pressure Engine Cooling Fan Solenoid Communicate w/Trans Prelube Pump Relay Wastegate Solenoid Unfiltered Oil Pressure Signal Engine Fan Speed Sensor Signal Start Aid Relay Start Aid Hold Relay Caterpillar Monitoring System Communications Oil Renewal Solenoid Left Exhaust Temp Signal Right Exhaust Temp Signal Rear Aftercooler Coolant Temperature Signal
Component Fuel Level Sensor Transmission Oil Temperature Sensor Data Link Sensor Power Supply Action Alarm Action Lamp Brake Air Pressure Sensor Display Data Link Display Power Supply Brake Oil Temperature Sensor
ID A C E F G H J K L M N P R T V W Y AA AE AF AG AH AJ AK AL AM AN AP AR AT AV AW AY CA CC CE CF CG CH CJ CK CL CM CN CP CR CT CW CX EC EE FF GA GG HH JJ KK LL MM NN PP RR UU YY
ATA DATA LINK (-) SHUTDOWN SIG N/O CAT DAT LINK (-) +BATTERY -BATTERY +BATTERY ATA DATA LINK (+) SHUTDOWN SIG N/C CAT DATA LINK (+) UNUSED -BATTERY TIMING CAL A/C STATUS SW THROTTLE BYPASS UNUSED UNUSED FUEL FILTER SW TIMING CAL + USER DEF SHUTDOWN BU SOUND REDUCTN ORS RLY START AID HOLD RELAY KEY SW ON LOW OIL LVL SW MANUAL START AID SW COOLANT FLOW SW UNUSED SHUT/FAN BRK SOL DIGITAL RETURN ANALOG RETURN CRANKCASE PRESS +V TIMING UNUSED PRELUBE RELAY +V THROTTLE +5V ANALOG SUPPLY OIL PRES (UNFLTR) SPD TIMING ENGINE FAN SPD START AID ON RELAY
+BATTERY -BATTERY CAT DATA LINK RETARDER ACTIVE -BATTERY +BATTERY SOLENOID RETURN TCS ACTIVE LAMP CAT DATA LINK + TCS RIGHT SOL TCS LEFT SOL ARC AIR CONTROL ARC ON/OFF SW ARC ON/OFF SW SENSOR GROUND SENSOR GROUND TCS SERVO SOL ARC AIR SUPPLY TCS SYSTEM TEST ARC PRESS SW LOCATION CODE 1 LOCATION CODE 0 MANUAL RET SW UNUSED UNUSED UNUSED UNUSED LOC ENABLE (+BAT) UNUSED UNUSED UNUSED UNUSED UNUSED UNUSED UNUSED UNUSED UNUSED LOCATION CODE 2 UNUSED +BATTERY