33 1 2MB
ECM Connectors 6 HEUI Injectors
Engine Control Module
RENR1368-04 May 2001
Cab Diagnostic Connector
0-00 1-11 2-11 3-11 4-11 5-11 6-11 22-13 30-08 30-13 41-03 41-04 42-11
- 12 V +
Batteries Cruise Control On/Off & Set/Resume Switches
ECM Side
ECM Connector P1
Harness Side Accelerator Pedal Position Sensor
Top Camshaft Speed/Timing Sensor
Caterpillar Installed
Bottom Camshaft Speed/Timing Sensor
ECM Side
ECM Connector P2
Harness Side Injection Actuation Pressure Sensor
DT Connector Receptacle
OEM Installed
Coolant Level Sensor
Check Engine Lamp
Warning Lamp
3126B and 3126E Truck Engine Electrical System
Speedometer & Tachometer
DT Connector Plug
45 35 25
Boost Pressure Sensor
15 55
20 65
10
75
15
25
5
5 0
Receptacle Wedge
Atmospheric Pressure Sensor
Plug Wedge
A/C High Pressure Switch
MPH
85
RPM X 1000
30
Cooling Fan
(Specific Ratings Only)
Vehicle Speed Sensor
Receptacle Wedge Plug Wedge
Oil Pressure Sensor
Receptacle Wedge
PTO Accelerator Position Sensor
(Optional)
Fast Idle Enabled Lamp Or Wait To Start Lamp
Plug Wedge
HD Connector Receptacle
HD Connector Plug
Oil Level Switch (Optional)
Fast Idle Enable Switch
Coolant Temperature Sensor
Pin Contact
Socket Contact
PTO Switch On Lamp
PTO On/Off & PTO Set/Resume Switches
Transmission Neutral Switch
AT/MT/HT Transmission Relay
Sealing Plug
Intake Manifold Air Temperature Sensor
Speed/Timing Sensor Connectors
IAPCV Connector
Intake Air Heater Relay
Exhaust Brake Exhaust Brake On/Off Switch
Intake Air Heater Lamp
Intake Air Heater A
150 Series Receptacle
150 Series Plug © 2001 Caterpillar All Rights Reserved
Printed in U.S.A.
BKD1-UP 1AJ1-UP 8YL1-UP CKM1-UP CRP1-UP 7AS1-UP 8SZ1-UP 9SZ1-UP
Diagnostic Code Listing Flash PID-FMI Description Codes 55 102-04 Boost Press Sensor Short Circuit 72 102-07 Excessive Boost Pressure 72 105-03 Inlet Manifold Air Temp Sensor Open Circuit 73 105-04 Inlet Manifold Air Temp Sensor Short Circuit 73 108-03 Atmospheric Press Sensor Open Circuit 74 108-04 Atmospheric Press Sensor Short Circuit 74 110-00 High Coolant Temp Warning 42 110-03 Coolant Temp Sensor Open Circuit 29 110-04 Coolant Temp Sensor Short Circuit 29 110-11 Very High Coolant Temp 21 111-01 Low Coolant Level Warning 21 111-02 Coolant Level Sensor Fault 18 111-11 Very Low Coolant Level
70-05 70-06 71-00 71-01 71-14 84-00
Vehicle Overspeed Warning
41
190-11
84-01 84-02 84-08 84-10 91-08 91-13 100-03 100-04 100-11 102-03
Loss of Vehicle Speed Signal Invalid Vehicle Speed Signal Vehicle Speed Out of Range Vehicle Speed Rate of Change Invalid Throttle Signal Throttle Sensor Calibration Oil Press Sensor Open Circuit Oil Press Sensor Short Circuit Very Low Oil Press Boost Press Sensor Open Circuit
31 36 36 36 32 28 24 24 46 25
224-11 224-14 231-11 232-03 232-04 246-11 247-11 252-11 253-02 253-14
64-11
Clutch and Service Brake Switches
Description No Detected Faults Cylinder 1 Fault Cylinder 2 Fault Cylinder 3 Fault Cylinder 4 Fault Cylinder 5 Fault Cylinder 6 Fault Check Timing Sensor Calibration Invalid PTO Throttle Signal PTO Throttle Sensor Calibration 8 Volt Supply Above Normal 8 Volt Supply Below Normal Injection Actuation Press Control Valve Driver Fault Ignition Key Switch Fault Loss of Engine RPM Signal on Engine Speed and Timing Sensor Number 2 No Pattern on Engine Speed and Timing Sensor Number 2 Inlet Air Heater Open Circuit Inlet Air Heater Short Circuit Idle Shutdown Override Idle Shutdown Occurrence PTO Shutdown Occurrence
43-02 64-02
Ignition Key Switch
Injection Actuation Pressure Control Valve (IAPCV)
PID-FMI
Flash Codes 25 25 38 38 26 26 61 27 27 61 62 12 62
71 34
164-00 164-02
Injection Actuation Press Out of Range Injection Actuation Press Sensor Erratic
17 15
34
164-03
Injection Actuation Press Open Circuit
15
49 49 01 47 47
164-04 164-11 168-02 190-00 190-02
Injection Actuation Press Short Circuit Injection Actuation Press System Intermittent Battery Power to the ECM Engine Overspeed Warning Loss of RPM Signal on Engine Speed and Timing Sensor Number 1 No Pattern on Engine Speed and Timing Sensor Number 1 Theft Deterrent Enabled Engine Cranking / Theft Deterrent Enabled J1939 Data Link Fault 5 Volt Supply Above Normal 5 Volt Supply Below Normal Service Brake Switch Number 1 Fault Service Brake Switch Number 2 Fault Incorrect Engine Software Check Customer or System Parameters Truck Manuf. Parameter Not Programmed
15 39 51 35 34 34 00 00 58 21 21 00 00 59 56 56
INJECTOR CYLINDER NO.1
ENGINE BOOST PRESSURE
A702-PU
INJECTOR CYLINDER NO.3
C B A
C B A
COMPONENTS ARE SHOWN WITH THE KEY OFF UNLESS OTHERWISE SPECIFIED: ALL WIRES TO BE 18 AWG OR LARGER SAE J1560 TYPE TXL OR EQUIVALENT. FOR TWISTED PAIR SPECIFICATION SEE J1708.
ENGINE INTAKE MANIFOLD AIR TEMPERATURE ENGINE TEMPERATURE SENSOR COMMON
G458-GY G829-GN
995-BU G833-PK
C967-BU G833-PK
J103 P103
1 2
J100 P100
1 2
J802 P802
1 2
994-GY G827-BU G826-BR
A747-GY G829-GN G828-WH
G849-BR G829-GN G828-WH
A705-BU
L985-YL
TO ENGINE CYLINDER HEAD (NOT CYLINDER HEAD GROUND STUD)
C977-BU
H795-PK
BK RD WH
H795-PK C985-BU C986-BR J403 P403
B A C
B A
COOLANT TEMPERATURE SENSOR
ENGINE SPEED/TIMING SENSORS
INJECTION ACTUATION PRESSURE CONTROL VALVE (IAPCV)
INJECTOR HARNESS GROMMET
OIL PRESSURE SENSOR (OPTIONAL)
INJECTION ACTUATION PRESSURE SENSOR
INLET AIR TEMPERATURE SENSOR
OIL LEVEL SWITCH (OPTIONAL)
NOTE A
NOTE A
H795-PK
451-BR
450-YL
L902-GN
FAST IDLE ENABLE SWITCH
NOTE A
SIGNAL-
SIGNAL+
SPEEDOMETER NOTE A
G882-WH
A B
NOTE A
G808-BU G809-GN
INLET AIR HEATER RELAY
BOOST PRESSURE SENSOR
ATMOSPHERIC PRESSURE SENSOR
1 2
28 29 30 31 43 22 23 56 57 65 66 69 20 21 8
49 48 13 50 19 59 58
25 51 52 53 60 33 32 35 9 34 26 18 10 11 12
VEHICLE SPEED IN POSITIVE VEHICLE SPEED IN NEGATIVE INPUT #8 (REMOTE ACCELERATOR) AP SENSOR/SWITCH SENSOR COMMON +8V ACCELERATOR PEDAL POSITION OUTPUT #5
INPUT #11
+5V INPUT #7 ENGINE COOLANT LEVEL NORMAL ENGINE COOLANT LEVEL LOW INPUT #12
INPUT SENSOR COMMON #1 CLUTCH PEDAL POSITION SWITCH
INPUT #5 INPUT #13 INPUT #6
SET RESUME INPUT #1 (PTO ON/OFF SWITCH) INPUT #2 INPUT #18 OUTPUT #8 CRUISE CONTROL ON/OFF SWITCH INPUT #3 INPUT #4 SERVICE BRAKE PEDAL POSITION SWITCH
UNSWITCHED +BATTERY UNSWITCHED +BATTERY -BATTERY -BATTERY OUTPUT #6 OUTPUT #7
IGNITION KEY SWITCH
J1587 DATA LINK NEGATIVE J1587 DATA LINK POSITIVE J1939 DATA LINK SHIELD J1939 DATA LINK NEGATIVE J1939 DATA LINK POSITIVE
INPUT SENSOR COMMON #2 INPUT #14 TACHOMETER POSITIVE TACHOMETER NEGATIVE
SPEEDOMETER POSITIVE SPEEDOMETER NEGATIVE
EXHAUST BRAKE ON/OFF SWITCH
OUTPUT #2 OUTPUT #3 OUTPUT #4
WARNING LAMP CHECK ENGINE LAMP OUTPUT #1 OUTPUT #9
INTAKE AIR HEATER RELAY
ENGINE TIMING CALIBRATION PROBE+ ENGINE TIMING CALIBRATION PROBE-
BOTTOM CAMSHAFT SPEED/TIMINGBOTTOM CAMSHAFT SPEED/TIMING+
TOP CAMSHAFT SPEED/TIMINGTOP CAMSHAFT SPEED/TIMING+
ENGINE TEMPERATURE SENSOR COMMON
INPUT #16 ENGINE OIL LEVEL SWITCH ENGINE COOLANT TEMPERATURE ENGINE INTAKE MANIFOLD AIR TEMPERATURE
ECM GROUND STRAP
ENGINE OIL PRESSURE SENSOR +5V
ENGINE OIL PRESSURE SENSOR COMMON
ENGINE OIL PRESSURE SENSOR
ENGINE ATMOSPHERIC PRESSURE ENGINE PRESSURE SENSOR COMMON ENGINE PRESSURE SENSOR +5V
ENGINE BOOST PRESSURE ENGINE INJECTION ACTUATION PRESSURE
IAP CONTROL VALVE IAP CONTROL VALVE COMMON
INJECTOR COMMON CYLINDERS 1 & 2 INJECTOR COMMON CYLINDERS 3 & 4 INJECTOR COMMON CYLINDERS 5 & 6 INJECTOR CYLINDER 6 INJECTOR CYLINDER 5 INJECTOR CYLINDER 4 INJECTOR CYLINDER 3 INJECTOR CYLINDER 2 INJECTOR CYLINDER 1
VEHICLE HARNESS CONNECTOR J1/P1
ENGINE GROUND STUD CONNECTION
ENGINE CONTROL MODULE
TO ECM MOUNTING BOLT
ENGINE GROUND STUD CONNECTION
ENGINE HARNESS CONNECTOR J2/P2
BOOST PRESSURE SENSOR
VEHICLE HARNESS CONNECTOR
G808-BU G809-GN G845-PU H795-PK C985-BU C986-BR G837-YL
E971-GN
G844-PK C983-WH C984-YL 409-OR
G879-OR
G842-GY G882-WH G843-OR L901-GY C977-BU
C978-BR C979-OR K999-GN K980-PK L902-GN G840-PU C975-WH K982-YL G841-GN C992-PU
101-RD 101-RD 229-BK 229-BK G838-BR G839-BU
J906-BR
E793-BU E794-YL A249-BK K990-GN K900-YL
993-BR F713-OR 450-YL 451-BR
C973-GN
C974-PU
C981-GY
E718-PK E991-GY G836-WH
29 28 30 31 48 61 10 12 13 15 16 63 36 37 27 26 3 17 38 39 57 43 9 8 42 34 50 1 14 70 25 52 53 65 67 19 20 51 35 44 56 58 40 21 59 60 7 45 55 47 64 6 18 22 23 2 46 49 54 62 24 41 69 32 33 68 5 4 66 11 P1 J1
G850-BU
G856-WH G857-YL
E965-BU E966-YL
E963-BK E964-WH
G833-PK
G883-GN G458-GY 995-BU C967-BU
994-GY G827-BU G826-BR
44 45 46 55 54 39 38 37 36 47 67 68 1 63 64 4 5 61 62 70 40 27 6 7 14 3 2 15 16 17 24 42 41
P2 J2
ENGINE HARNESS CONNECTOR
A747-GY G829-GN G828-WH
A746-PK G849-BR
G854-PK G855-PU
L983-WH L984-OR L985-YL A706-GY A705-BU A704-GN A703-BR A702-PU A701-GY
659-PK L994-YL K998-BU G880-PK
NOTE A
NOTE A
NOTE A
G850-BU C987-RD
P648
C987-RD G850-BU
J400 P400
(TRANSMISSION IN GEAR) NOTE A
NOTE A
FLYBACK DIODE
A B J402 P402
N/O MOMENTARY SWITCH
ATMOSPHERIC PRESSURE SENSOR (SELECT RATINGS ONLY)
COOLING FAN SOLENOID NOTE A
PASSIVE MAGNETIC VEHICLE SPEED SENSOR
A B J401 P401
C973-GN
(PEDAL RELEASED POSITION)
409-OR
A B J500 P500
C974-PU
B A
14 AWG GXL 14 AWG GXL 14 AWG GXL 14 AWG GXL
SIGNAL-
SIGNAL+
EXHAUST BRAKE ON/OFF SWITCH
TRANSMISSION NEUTRAL SWITCH N/O
LEFT SIDE VIEW
INLET AIR HEATER
INLET AIR HEATER
INLET AIR TEMPERATURE SENSOR
B A J648
INTAKE AIR HEATER
N/O RELAY
1 2
J501 P501
ENGINE TIMING CALIBRATION PROBE+ ENGINE TIMING CALIBRATION PROBE-
SERVICE BRAKE PEDAL POSITION SWITCH #2 N/O
TOP VIEW
+BAT.
+BAT.
BOTTOM CAMSHAFT SPEED/TIMINGBOTTOM CAMSHAFT SPEED/TIMING+
K995-OR
6 5 4 3 2 1 P300 J300
TOP CAMSHAFT SPEED/TIMINGTOP CAMSHAFT SPEED/TIMING+
BOTTOM CAMSHAFT ENGINE SPEED/TIMING SENSOR
TACHOMETER NOTE A
NOTE A
A706-GY
INJECTION ACTUATION PRESSURE CONTROL VALVE (IAPCV)
TOP CAMSHAFT ENGINE SPEED/TIMING SENSOR
INJECTOR CYLINDER NO.6
J306 P306
L985-YL
12 11 10 9 8 7
INJECTOR HARNESS GROMMET
ENGINE CONTROL MODULE
INJECTION ACTUATION PRESSURE CONTROL VALVE
INJECTOR HARNESS GROMMET
INJECTION ACTUATION PRESSURE SENSOR
G844-PK N/O MOMENTARY SWITCH
H795-PK
DIAGNOSTIC ENABLE SWITCH
C992-PU
SERVICE BRAKE PEDAL POSITION SWITCH N/C
NOTE A: THIS IS AN OPTIONAL FEATURE NOT INSTALLED ON ALL VEHICLES.
SENSOR ACCELERATOR PEDAL POSITION
ACCELERATOR PEDAL SENSOR/SWITCH SENSOR COMMON +8 V ACCELERATOR PEDAL POSITION
E971-GN
A/C HIGH PRESSURE SWITCH N/C
H795-PK
C978-BR C979-OR
20A
+BAT. B -BAT. A J H J1587 - G E793-BU J1587 + F E794-YL A249-BK J1939 SHIELD E J1939 - D K990-GN J1939 + C K900-YL NOTE A
SET/RESUME SWITCH
H795-PK
FLYBACK DIODE
G880-PK
659-PK
L994-YL
C987-RD
INTAKE AIR HEATER LAMP
9 PIN CAB CONNECTOR
EXHAUST BRAKE SOLENOID
FAST IDLE ENABLED LAMP OR WAIT TO START LAMP
WARNING LAMP
CHECK ENGINE LAMP
100A WITH 130A PEAK AT 11V
H795-PK (PEDAL RELEASED POSITION)
CLUTCH PEDAL POSITION SWITCH N/C
COMPONENTS WITHIN THIS AREA ARE CATERPILLAR PROVIDED
NOTE A
NOTE A
C975-WH CRUISE CONTROL ON/OFF SWITCH
H795-PK
(PEDAL RELEASED POSITION)
NOTE A
NOTE A
NOTE A
NOTE A NOTE A
ENGINE BLOCK
BATTERY 1
BATTERY 2 BATTERY 3
K995-OR TO ALLISON AT/MT/HT SHIFT MODULATOR FOR AUTOMATIC TRANSMISSIONS
- 12V +
- 12V +
STARTER MOTOR (12V)
N/O RELAY
- 12V +
NOTE A
GROUND
ALTERNATOR
OFF ON START
KEY SWITCH
CIRCUITS WITHIN THIS AREA ARE RECOMMENDATIONS
C987-RD
3126B & 3126E OEM VEHICLE HARNESS WIRING DIAGRAM
NOTE A: THIS IS AN OPTIONAL FEATURE NOT INSTALLED ON ALL VEHICLES.
(-) BATTERY / SENSOR RETURN
SIGNAL MINUS
SIGNAL PLUS
SENSOR SUPPLY VOLTAGE
OUTPUT SIGNAL WIRES FROM ECM
INPUT SIGNAL WIRES TO ECM
(+) BATTERY SUPPLY WIRES
ENGINE INTAKE MANIFOLD AIR TEMPERATURE SENSOR
ENGINE COOLANT TEMPERATURE ENGINE TEMPERATURE SENSOR COMMON
P201 J201
GN YL OR
C B A
P203 J203
GN YL OR
A746-PK G829-GN G828-WH
J200 P200
C B A
P204 J204
GN YL 0R
GN YL OR
A704-GN
INJECTOR CYLINDER NO.5
B A
INJECTOR CYLINDER NO.4
J305 P305
B A
L984-OR
J304 P304
A703-BR
ENGINE COOLANT TEMPERATURE SENSOR
ENGINE OIL PRESSURE SENSOR ENGINE OIL PRESSURE SENSOR COMMON ENGINE OIL PRESSURE SENSOR +5V
ENGINE PRESSURE SENSOR +5V
ENGINE PRESSURE SENSOR COMMON
ENGINE ATMOSPHERIC PRESSURE
ENGINE PRESSURE SENSOR +5V
ENGINE PRESSURE SENSOR COMMON
ENGINE INJECTION ACTUATION PRESS.
ENGINE PRESSURE SENSOR +5V
ENGINE PRESSURE SENSOR COMMON
INJECTOR CYLINDER NO.2
B A
J303 P303
L984-OR
ENGINE OIL LEVEL ENGINE OIL LEVEL COMMON
A701-GY
B A
J302 P302
L983-WH
ENGINE OIL LEVEL SWITCH NOTE A
ENGINE OIL PRESSURE SENSOR NOTE A
ENGINE ATMOSPHERIC PRESSURE SENSOR NOTE A
ENGINE INJECTION ACTUATION PRESSURE SENSOR
ENGINE BOOST PRESSURE SENSOR
B A
J301 P301
L983-WH
3126B & 3126E ENGINE HARNESS WIRING DIAGRAM
ENGINE CONTROL MODULE