1998 DODGE RAM 1500 idle air control

8W-02 COMPONENT INDEX
Component Page
A/C Compressor Clutch................. 8W-42
A/C Compressor Clutch Relay............ 8W-42
A/C Pressure Transducer................ 8W-42
A/C-Heater Control.................... 8W-42
Accelerator Pedal Position Sensor......... 8W-30
Adjustable Pedal Motor................. 8W-30
Adjustable Pedal Relay................. 8W-30
Adjustable Pedal Switch................ 8W-30
Airbag Control Module................. 8W-43
Airbag-Squibs........................ 8W-43
Airbag-Curtains....................... 8W-43
Airbag-Passenger On/Off Switch.......... 8W-43
Ambient Temperature Sensor............ 8W-49
Amplifier Audio....................... 8W-47
Ashtray Lamp........................ 8W-44
Auto Shut Down Relay................. 8W-30
Automatic Day/Night Mirror.......... 8W-49, 55
Auxiliary Battery..................... 8W-20
Backup Lamp Switch.................. 8W-51
Battery............................. 8W-20
Battery Temperature Sensor............. 8W-30
Blend Door Actuators.................. 8W-42
Blower Motor......................... 8W-42
Blower Motor Resistor Block............. 8W-42
Brake Fluid Level Switch............ 8W-34, 35
Brake Lamp Switch.................... 8W-33
Brake Transmission Shift Interlock
Solenoid........................... 8W-40
Camshaft Position Sensor............... 8W-30
Capacitor............................ 8W-30
Center High Mounted Stop Lamp-
Aftermarket........................ 8W-51
Center High Mounted Stop Lamp/Cargo
Lamp.......................... 8W-44, 51
Cigar Lighter Outlet................... 8W-41
Circuit Breaker....................... 8W-10
Clearance Lamps...................... 8W-50
Clockspring................. 8W-33, 41, 43, 47
Clutch Interlock Brake Switch........... 8W-21
Coil On Plugs........................ 8W-30
Compass/Mini-Trip Computer............ 8W-49
Condenser Fan....................... 8W-42
Condenser Fan Relay.................. 8W-42
Controller Antilock Brake............ 8W-34, 35
Crankshaft Position Sensor.............. 8W-30
Cylinder Lock Switch-Driver............. 8W-61
Data Link Connector................... 8W-18
Data Link Connector-Engine............. 8W-18
Dome Lamp....................... 8W-44, 49
Door Ajar Switches.................... 8W-40
Door Lock Motor/Ajar Switches........ 8W-40, 61
Door Lock Switch-Passenger............. 8W-61Component Page
Door Module................... 8W-60, 61, 62
EGR Solenoid........................ 8W-30
Electric Backlight..................... 8W-48
Electric Brake Provision................ 8W-54
Electronic Throttle Control Module........ 8W-30
Engine Control Module................. 8W-30
Engine Coolant Temperature Sensor....... 8W-30
Engine Oil Pressure Switch.............. 8W-30
EVAP/Purge Solenoid.................. 8W-30
Evaporator Temperature Sensor.......... 8W-42
Fender Lamps........................ 8W-51
Fog Lamp Relay...................... 8W-50
Fog Lamps.......................... 8W-50
Front Control Module.................. 8W-10
Fuel Control Actuator.................. 8W-30
Fuel Heater.......................... 8W-30
Fuel Heater Relay..................... 8W-30
Fuel Injector Packs.................... 8W-30
Fuel Injectors........................ 8W-30
Fuel Pump Module.................... 8W-30
Fuel Pump Motor..................... 8W-30
Fuel Pump Relay...................... 8W-30
Fuses............................ 8W-10, 33
Fusible Link......................... 8W-10
Generator........................... 8W-20
Glove Box Lamp And Switch............. 8W-44
Grounds............................ 8W-15
Hands Free Module.................... 8W-55
Headlamp Switch.................. 8W-40, 50
Headlamps.......................... 8W-50
Heated Mirror Relay................... 8W-62
Heated Seat Cushions.................. 8W-63
Horn Relay.......................... 8W-41
Horn Switch......................... 8W-41
Horn-High Note....................... 8W-41
Horn-Low Note....................... 8W-41
Idle Air Control Motor.................. 8W-30
Ignition Switch....................... 8W-10
Inlet Air Temperature Sensor............ 8W-30
Input Speed Sensor.................... 8W-31
Instrument Cluster.................... 8W-40
Intake Air Heater Relays............... 8W-30
Intake Air Temperature Sensor........... 8W-30
Intake Air Temperature/Manifold Absolute
Pressure Sensor..................... 8W-30
Integrated Power Module............... 8W-10
Knock Sensosr........................ 8W-30
License Lamps....................... 8W-51
Lift Pump Motor...................... 8W-30
Line Pressure Sensor................ 8W-30, 31
Lumbar Motors....................... 8W-63
Lumbar Switch....................... 8W-63
DR8W-02 COMPONENT INDEX 8W - 02 - 1

8W-30 FUEL/IGNITION SYSTEM
Component Page
A/C Compressor Clutch Relay............ 8W-30-9, 58
A/C Pressure Transducer......... 8W-30-23, 28, 29, 45
Accelerator Pedal Position Sensor . . . 8W-30-29, 47, 64, 65
Adjustable Pedal Motor................. 8W-30-61
Adjustable Pedal Relay.................. 8W-30-61
Adjustable Pedal Switch................. 8W-30-61
Ambient Temperature Sensor............. 8W-30-30
Auto Shut Down Relay................... 8W-30-4
Battery............................ 8W-30-52
Battery Temperature Sensor............ 8W-30-12, 56
Brake Lamp Switch............. 8W-30-8, 36, 57, 63
Camshaft Position Sensor........ 8W-30-10, 29, 45, 46
Capacitor........................... 8W-30-13
Clockspring..................... 8W-30-8, 36, 59
Coil On Plug No. 1.................. 8W-30-14, 39
Coil On Plug No. 2.................. 8W-30-15, 37
Coil On Plug No. 3.................. 8W-30-14, 39
Coil On Plug No. 4.................. 8W-30-15, 37
Coil On Plug No. 5.................. 8W-30-16, 39
Coil On Plug No. 6.................. 8W-30-13, 37
Coil On Plug No. 7.................. 8W-30-16, 39
Coil On Plug No. 8.................. 8W-30-13, 37
Condenser Fan Relay.................... 8W-30-9
Controller Antilock Brake............ 8W-30-6, 11, 57
Crankshaft Position Sensor............ 8W-30-10, 46
Data Link Connector............... 8W-30-9, 22, 55
Data Link Connector-Engine.............. 8W-30-51
EGR Solenoid................... 8W-30-28, 29, 32
Electronic Throttle Control Module.......... 8W-30-35
Engine Control Module....... 8W-30-42, 43, 44, 45, 46,
47, 48, 49, 50, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 62, 63, 64, 65
Engine Coolant Temperature Sensor.... 8W-30-23, 41, 47
Engine Oil Pressure Switch.......... 8W-30-2, 53, 56
EVAP/Purge Solenoid................... 8W-30-12
Front Control Module................... 8W-30-61
Fuel Control Actuator................... 8W-30-50
Fuel Heater......................... 8W-30-60
Fuel Heater Relay..................... 8W-30-60
Fuel Injector No. 1.................. 8W-30-14, 40
Fuel Injector No. 2.................. 8W-30-15, 38
Fuel Injector No. 3.................. 8W-30-14, 40
Fuel Injector No. 4.................. 8W-30-15, 38
Fuel Injector No. 5.................. 8W-30-14, 40
Fuel Injector No. 6.................. 8W-30-15, 38
Fuel Injector No. 7.................. 8W-30-16, 40
Fuel Injector No. 8.................. 8W-30-13, 38
Fuel Injector Pack No. 1................. 8W-30-42
Fuel Injector Pack No. 2............ 8W-30-42, 43, 44
Fuel Injector Pack No. 3................. 8W-30-44
Fuel Pump Module................... 8W-30-3, 58
Fuel Pump Motor...................... 8W-30-48
Fuel Pump Relay....................... 8W-30-3
Fuse 2.............................. 8W-30-4
Fuse 5........................... 8W-30-25, 62
Fuse 12............................ 8W-30-60
Fuse 17............................. 8W-30-3
Fuse 19............................ 8W-30-52
Fuse 23............................. 8W-30-2Component Page
Fuse 36.......................... 8W-30-54, 61
Fuse 40............................ 8W-30-61
Fuse 49............................. 8W-30-4
Fuse 50..................... 8W-30-2, 55, 58, 62
Fusible Link......................... 8W-30-52
G104........................ 8W-30-3, 8, 25, 60
G105............................ 8W-30-56, 58
G107........... 8W-30-2, 7, 15, 18, 19, 20, 21, 30, 32
G114 .............................. 8W-30-53
G120............................ 8W-30-51, 60
G201............................... 8W-30-6
G202.............................. 8W-30-61
Generator......................... 8W-30-7, 51
Idle Air Control Motor................... 8W-30-9
Ignition Switch..................... 8W-30-6, 22
Inlet Air Temperature Sensor............. 8W-30-49
Input Speed Sensor.................... 8W-30-24
Instrument Cluster.................... 8W-30-30
Intake Air Heater Relay No. 1............. 8W-30-56
Intake Air Heater Relay No. 2............. 8W-30-56
Intake Air Temperature Sensor.......... 8W-30-23, 41
Intake Air Temperature/Manifold Absolute
Pressure Sensor..................... 8W-30-50
Integrated Power Module.... 8W-30-2, 3, 4, 9, 25, 52, 54,
55, 58, 60, 61, 62, 64
Knock Sensor........................ 8W-30-31
Knock Sensor-Left..................... 8W-30-33
Knock Sensor-Right.................... 8W-30-33
Lift Pump Motor...................... 8W-30-51
Line Pressure Sensor................... 8W-30-17
Manifold Absolute Pressure Sensor..... 8W-30-23, 29, 41
Natural Vacuum Leak Detection Assembly..... 8W-30-7
Output Speed Sensor................. 8W-30-24, 62
Oxygen Sensor 1/1 Upstream........... 8W-30-20, 21
Oxygen Sensor 1/2 Downstream......... 8W-30-18, 19
Oxygen Sensor 2/1 Upstream........... 8W-30-20, 21
Oxygen Sensor 2/2 Downstream......... 8W-30-18, 19
Oxygen Sensor Downstream Relay........... 8W-30-4
Power Steering Pressure Switch............ 8W-30-7
Powertrain Control Module....... 8W-30-2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32,
33, 35, 36, 37, 38, 39, 40, 41
PTCNo.1 ....................... 8W-30-3, 9, 58
Pto Switch........................... 8W-30-6
Speed Control Servo.................. 8W-30-8, 63
Speed Control Switch-Left............. 8W-30-36, 59
Speed Control Switch-Right............ 8W-30-36, 59
Starter Motor Relay.................. 8W-30-2, 64
Throttle Position Sensor................. 8W-30-17
Tow/Haul Overdrive Switch............. 8W-30-6, 64
Transmission Control Relay............ 8W-30-25, 62
Transmission Range Sensor............... 8W-30-64
Transmission Solenoid Assembly......... 8W-30-54, 62
Transmission Solenoid/TRS Assembly . 8W-30-5, 25, 26, 27
Vacuum Pump........................ 8W-30-58
Vistronic Fan Drive.................... 8W-30-54
Water In Fuel Sensor................ 8W-30-47, 48
DR8W-30 FUEL/IGNITION SYSTEM 8W - 30 - 1

Component Page
Fuel Pump Module.................. 8W-80-66
Fuel Pump Motor (Diesel)............ 8W-80-66
Generator......................... 8W-80-67
Glove Box Lamp And Switch.......... 8W-80-67
Hands Free Module (Telematics)....... 8W-80-67
Headlamp Switch................... 8W-80-68
Headlamp-Left..................... 8W-80-68
Headlamp-Right.................... 8W-80-68
Heated Seat Cushion-Driver........... 8W-80-68
Heated Seat Cushion-Passenger........ 8W-80-69
Heated Seat Switch-Driver............ 8W-80-69
Heated Seat Switch-Passenger......... 8W-80-69
Horn Switch....................... 8W-80-69
Horn-High Note.................... 8W-80-70
Horn-Low Note..................... 8W-80-70
Idle Air Control Motor (3.7L/4.7L)...... 8W-80-70
Ignition Switch..................... 8W-80-70
Inlet Air Temperature Sensor.......... 8W-80-71
Input Speed Sensor (45RFE).......... 8W-80-71
Instrument Cluster C1............... 8W-80-71
Instrument Cluster C2............... 8W-80-72
Instrument Cluster C3............... 8W-80-72
Intake Air Temperature Sensor (Gas).... 8W-80-73
Intake Air Temperature/Manifold Absolute
Pressure Sensor (Diesel)............ 8W-80-73
Integrated Power Module C1.......... 8W-80-73
Integrated Power Module C2.......... 8W-80-74
Integrated Power Module C3.......... 8W-80-74
Integrated Power Module C4.......... 8W-80-75
Integrated Power Module C5.......... 8W-80-75
Integrated Power Module C6.......... 8W-80-76
Integrated Power Module C7.......... 8W-80-76
Knock Sensor (3.7L)................. 8W-80-77
Knock Sensor-Left (5.7L)............. 8W-80-77
Knock Sensor-Right (5.7L)............ 8W-80-77
License Lamp-Left.................. 8W-80-77
License Lamp-Right................. 8W-80-77
Lift Pump Motor (Diesel)............. 8W-80-78
Line Pressure Sensor (NGC)........... 8W-80-78
Lumbar Motor-Driver................ 8W-80-78
Lumbar Motor-Passenger............. 8W-80-78
Manifold Absolute Pressure Sensor
(NGC).......................... 8W-80-79
Mode Door Actuator 1 (Panel To Floor) . . . 8W-80-79
Mode Door Actuator 2 (Defrost To Floor) . 8W-80-79
Multi-Function Switch............... 8W-80-79
Natural Vacuum Leak Detection Assembly
(NGC).......................... 8W-80-80
Output Speed Sensor (45RFE)......... 8W-80-80
Output Speed Sensor (47RE).......... 8W-80-80
Overhead Map/reading Lamp (Except
Base).......................... 8W-80-80
Oxygen Sensor 1/1 Upstream (NGC).... 8W-80-81
Oxygen Sensor 1/2 Downstream (NGC) . . 8W-80-81Component Page
Oxygen Sensor 2/1 Upstream (NGC).... 8W-80-81
Oxygen Sensor 2/2 Downstream (NGC) . . 8W-80-81
Park/Turn Signal Lamp-Left Front...... 8W-80-82
Park/Turn Signal Lamp-Right Front.... 8W-80-82
Passenger Blend Door Actuator (Dual-
Zone).......................... 8W-80-82
Passenger Lumbar Switch............ 8W-80-82
Power Mirror-Left................... 8W-80-82
Power Mirror-Right................. 8W-80-83
Power Outlet...................... 8W-80-83
Power Outlet-Console (Except Base)..... 8W-80-83
Power Seat Motor-Driver Front Vertical . . 8W-80-83
Power Seat Motor-Driver Horizontal.... 8W-80-84
Power Seat Motor-Driver Rear Vertical . . 8W-80-84
Power Seat Motor-Passenger Front
Vertical......................... 8W-80-84
Power Seat Motor-Passenger Horizontal . 8W-80-84
Power Seat Motor-Passenger Rear
Vertical......................... 8W-80-84
Power Seat Switch-Driver............ 8W-80-85
Power Seat Switch-Passenger.......... 8W-80-85
Power Steering Pressure Switch (NGC) . . 8W-80-85
Power Window Circuit Breaker........ 8W-80-86
Power Window Motor-Driver.......... 8W-80-86
Power Window Motor-Left Rear........ 8W-80-86
Power Window Motor-Passenger........ 8W-80-86
Power Window Motor-Right Rear....... 8W-80-87
Power Window Switch-Left Rear....... 8W-80-87
Power Window Switch-Passenger....... 8W-80-87
Power Window Switch-Right Rear...... 8W-80-87
Powertrain Control Module C1 (NGC) . . . 8W-80-88
Powertrain Control Module C2 (NGC) . . . 8W-80-89
Powertrain Control Module C3 (NGC) . . . 8W-80-90
Powertrain Control Module C4 (NGC) . . . 8W-80-91
Radio C1 (Except Infinity)............ 8W-80-92
Radio C1 (Infinity).................. 8W-80-92
Radio C2.......................... 8W-80-93
Recirculation Door Actuator........... 8W-80-93
Remote Radio Switch-Left............ 8W-80-93
Remote Radio Switch-Right........... 8W-80-93
Seat Belt Switch-Driver.............. 8W-80-94
Seat Belt Tensioner Reducer (Standard
Cab)........................... 8W-80-94
Seat Belt Tensioner-Driver............ 8W-80-94
Seat Belt Tensioner-Passenger......... 8W-80-94
Seat Heater Interface Module.......... 8W-80-94
Sentry Key Immobilizer Module (SKIM) . . 8W-80-95
Side Impact Sensor-Left.............. 8W-80-95
Side Impact Sensor-Right............. 8W-80-95
Speaker-Center Instrument Panel...... 8W-80-95
Speaker-Left Front Door.............. 8W-80-95
Speaker-Left Instrument Panel........ 8W-80-96
Speaker-Left Rear.................. 8W-80-96
Speaker-Right Front Door............ 8W-80-96
DR8W-80 CONNECTOR PIN-OUTS 8W - 80 - 3

ENGINE CONTROL MODULE C1 (DIESEL) - 60 WAY
CAV CIRCUIT FUNCTION
26 C918 18BK/LB A/C PRESSURE SENSOR GROUND
27 K853 18DB/BR 5 VOLT SUPPLY
28 - -
29 K690 18DG/YL (A/T) INLET AIR TEMPERATURE/PRESSURE RETURN
29 K690 18BR/YL (M/T) INLET AIR TEMPERATURE/PRESSURE RETURN
30 K11 16WT/DB (A/T) INJECTOR CONTROL NO. 1
30 K11 16BR/YL (M/T) INJECTOR CONTROL NO.1
31 G123 18VT/LG WATER IN FUEL SENSOR SIGNAL
32 K916 18BR/OR SENSOR GROUND
33 K922 18LG/OR (A/T) THROTTLE POSITION SENSOR RETURN
33 K167 18BR/YL (M/T) APPS NO. 1 RETURN
34 K565 18OR IDLE SWITCH
35 - -
36 K14 16BR/TN INJECTOR CONTROL NO. 4
37 - -
38 - -
39 - -
40 K13 16TN (A/T) INJECTOR CONTROL NO. 3
40 K13 16BR/LB (M/T) INJECTOR CONTROL NO.3
41 - -
42 K851 18VT/PK (A/T) 5-VOLT SUPPLY
42 K852 18BR/VT (M/T) APPS 1 5-VOLT SUPPLY
43 K37 18LB (A/T) BOOST PRESSURE SENSOR SIGNAL
43 K37 18BR/OR (M/T) BOOST PRESSURE SENSOR SIGNAL
44 K556 18OR/BR NOT IDLE SWITCH
45 N2 18DB/YL LIFT PUMP FEED
46 K58 16BR/VT INJECTOR CONTROL NO. 6
47 - -
48 - -
49 - -
50 K12 16BR/DB INJECTOR CONTROL NO. 2
51 - -
52 K975 18BR/BK (A/T) SENSOR GROUND
52 K975 18BR/OR (M/T) SENSOR GROUND
53 K915 18VT/RD FUEL RAIL SENSOR RETURN
54 F855 18PK/YL 5 VOLT SUPPLY
55 - -
56 K38 16GY (A/T) INJECTOR CONTROL NO. 5
56 K38 16BR/OR (M/T) INJECTOR CONTROL NO. 5
57 K229 16TN/PK (A/T) ENG-INJECTOR HIGH SIDE DRIVER-BANK 2
57 K229 16BR/LB (M/T) ENG-INJECTOR HIGH SIDE DRIVER-BANK 2
58 - -
59 K227 16BR/LG ENG-INJECTOR HIGH SIDE DRIVER-BANK 1
60 - -
DR8W-80 CONNECTOR PIN-OUTS 8W - 80 - 59

HORN-HIGH NOTE-2WAY
CAV CIRCUIT FUNCTION
1 X2 18DG/OR HORN RELAY OUTPUT
2 Z299 18BK/OR GROUND
HORN-LOW NOTE-2WAY
CAV CIRCUIT FUNCTION
1 X2 18DG/OR HORN RELAY OUTPUT
2 Z298 18BK/DB GROUND
IDLE AIR CONTROL MOTOR (3.7L/4.7L) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 K961 18BR/VT IAC RETURN
2 K61 18VT/GY IAC MOTOR CONTROL
IGNITION SWITCH - BLACK 14 WAY
CAV CIRCUIT FUNCTION
1 A970 10RD FUSED B(+)
2 F1 16PK/WT FUSED IGNITION SWITCH OUTPUT (OFF-RUN-START)
3 F951 16PK/LG FUSED IGNITION SWITCH OUTPUT (RUN-START)
4 A951 16RD FUSED B(+)
5 G15 20VT/TN KEY IN IGNITION SWITCH SENSE
6 Z943 20BK GROUND
7 A921 16RD FUSED B(+)
8 C7 10DB BLOWER MOTOR FEED
9 F982 14PK/YL FUSED IGNITION SWITCH OUTPUT (RUN-ACC)
10 F991 10PK/YL (POWER WINDOWS) FUSED IGNITION SWITCH OUTPUT (RUN-START)
11 A981 14RD FUSED B(+)
12 A991 10RD (POWER WINDOWS) FUSED B(+)
13 T751 16YL FUSED IGNITION SWITCH OUTPUT (START)
14 F922 16PK/YL FUSED IGNITION SWITCH OUTPUT (RUN)
8W - 80 - 70 8W-80 CONNECTOR PIN-OUTSDR

CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Glove Box Lamp and Switch BK At Glove Box 35, 39
Governor Pressure Sensor BK Left Rear of Transmission N/S
Hands Free Module Right Instrument Panel 39
Headlamp Switch BK Left Side of Instrument Panel 32, 35, 38
Headlamp-Left BL At Headlamp 23, 28, 29
Headlamp-Right BL At Headlamp 1, 21, 26
Heated Seat Cushion - Driver BL Under Driver Seat N/S
Heated Seat Cushion - Passenger BL Under Passenger Seat N/S
Heated Seat Switch-Driver RD Center of Instrument Panel 33, 35, 36
Heated Seat Switch-Passenger BL Center of Instrument Panel 33, 35, 36
Horn Switch WT In Steering Wheel N/S
Horn-High Note BK Left Front Fender 23, 28, 29
Horn-Low Note BK Left Front Fender 23, 29
Idle Air Control Motor BK On Throttle Body 6
Ignition Coil GY Left Rear of Engine N/S
Ignition Switch BK Steering Column 31
Inlet Air Temperature/Pressure
SensorBK Right Side Engine 10
Input Speed Sensor BK At Transmission 15, 16
Instrument Cluster C1 GY Rear of Instrument Cluster 35
Instrument Cluster C2 GY Rear of Instrument Cluster 35
Instrument Cluster C3 WT Rear of Instrument Cluster 35
Intake Air Heater Relay Right Engine Compartment 2
Intake Air Temperature/Manifold
Absolute Pressure Sensor (Diesel)BK Left rear Engine N/S
Intake Air Temperature Sensor BK On Intake Manifold 5
Integrated Power Module C1 BK Left Front Fender 26, 28
Integrated Power Module C2 WT Left Front Fender 26, 28
Integrated Power Module C3 GR Left Front Fender 26, 28
Integrated Power Module C4 WT Left Front Fender 26, 28
Integrated Power Module C5 BK Left Front Fender 26, 28
Integrated Power Module C6 BK Left Front Fender 25, 26, 28
Integrated Power Module C7 GY Left Front Fender 26, 28
Integrated Power Module FCM BK In IPM N/S
Knock Sensor BK Left Rear of Engine 5, 7, 9
License Lamp-Left BK At Rear Bumper 50, 51
License Lamp-Right BK At Rear Bumper 50, 51
Lift Pump Motor BK Near T/O for WIF Sensor N/S
Line Pressure Sensor BK Right Rear of Transmission 15, 18
Lumbar Motor-Driver DK GY At Driver Seat N/S
Lumbar Motor-Passenger BK At Passenger Seat N/S
Manifold Absolute Pressure Sensor GY Left Front of Intake Manifold 6
Mode Door Actuator 1 BK Right Side of HVAC N/S
DR8W-91 CONNECTOR/GROUND/SPLICE LOCATION 8W - 91 - 5
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION
Engine diagnosis is helpful in determining the
causes of malfunctions not detected and remedied by
routine maintenance.
These malfunctions may be classified as either per-
formance (e.g., engine idles rough and stalls) or
mechanical (e.g., a strange noise).
(Refer to 9 - ENGINE - DIAGNOSIS AND TEST-
ING) - PERFORMANCE and (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)ÐMECHANICAL for
possible causes and corrections of malfunctions.
(Refer to 14 - FUEL SYSTEM/FUEL DELIVERY -
DIAGNOSIS AND TESTING) and (Refer to 14 -
FUEL SYSTEM/FUEL INJECTION - DIAGNOSIS
AND TESTING) for the fuel system diagnosis.Additional tests and diagnostic procedures may be
necessary for specific engine malfunctions that can
not be isolated with the Service Diagnosis charts.
Information concerning additional tests and diagno-
sis is provided within the following diagnosis:
²Cylinder Compression Pressure Test (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
²Cylinder Combustion Pressure Leakage Test
(Refer to 9 - ENGINE - DIAGNOSIS AND TEST-
ING).
²Engine Cylinder Head Gasket Failure Diagnosis
(Refer to 9 - ENGINE/CYLINDER HEAD - DIAGNO-
SIS AND TESTING).
²Intake Manifold Leakage Diagnosis (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE MANIFOLD -
DIAGNOSIS AND TESTING).
DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - PERFORMANCE
CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT START 1. Weak battery 1. Charge or replace as necessary.
2. Corroded or loose battery
connections.2. Clean and tighten battery
connections. Apply a coat of light
mineral grease to the terminals.
3. Faulty starter. 3. (Refer to 8 - ELECTRICAL/
STARTING - DIAGNOSIS AND
TESTING).
4. Faulty coil or control unit. 4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
5. Incorrect spark plug gap. 5. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG
- CLEANING).
6. Incorrect right bank cam timing. 6. Refer to engine timing in this
section.
7. Dirt or water in fuel system. 7. Clean system and replace fuel
filter.
8.Faulty fuel pump, relay or wiring. 8.Repair or replace as necessary.
9. Faulty cam or crank sensor 9. Refer to Ignition system.
ENGINE STALLS OR ROUGH IDLE 1. Vacuum leak. 1. Inspect intake manifold and
vacuum hoses, repair or replace as
necessary.
2. Faulty crank position sensor 2. Replace crank position sensor.
3. Faulty coil. 3. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
9 - 4 ENGINE - 3.7LDR
ENGINE - 3.7L (Continued)

(12) Disconnect heater hoses from heater core and
remove hose assembly.
(13) Disconnect throttle and speed control cables.
(14) Remove upper radiator hose from engine.
(15) Remove lower radiator hose from engine.
(16) Remove radiator/cooling module assembly.
(17) Disconnect the engine to body ground straps
at the left side of cowl.
(18) Disconnect the engine wiring harness at the
following points:
²Intake air temperature (IAT) sensor
²Fuel Injectors
²Throttle Position (TPS) Switch
²Idle Air Control (IAC) Motor
²Engine Oil Pressure Switch
²Engine Coolant Temperature (ECT) Sensor
²Manifold Absolute Pressure MAP) Sensor
²Camshaft Position (CMP) Sensor
²Coil Over Plugs
²Crankshaft Position Sensor
(19) Remove coil over plugs.
(20) Release fuel rail pressure.
(21) Remove fuel rail and secure away from
engine.
NOTE: It is not necessary to release the quick con-
nect fitting from the fuel supply line for engine
removal.
(22) Remove the PCV hose.
(23) Remove the breather hoses.
(24) Remove the vacuum hose for the power brake
booster.
(25) Disconnect knock sensors.
(26) Remove engine oil dipstick tube.
(27) Remove intake manifold.
(28) Install engine lifting fixture,special tool#8247,
using original fasteners from the removed intake
manifold, and fuel rail. Torque to factory specifica-
tions.
NOTE: Recheck bolt torque for engine lift plate
before removing engine.
(29) Secure the left and right engine wiring har-
nesses away from engine.
(30) Raise vehicle.
(31) Disconnect oxygen sensor wiring.
(32) Disconnect crankshaft postion sensor.
(33) Disconnect the engine block heater power
cable, if equipped.
(34) Disconnect the front propshaft at the front
differential and secure out of way.
NOTE: It is necessary to disconnect the front prop-
shaft for access to the starter and left side exhaust
flange.(35) Remove the starter.
(36) Remove the ground straps from the left and
right side of the block.
(37) Disconnect the right and left exhaust pipes at
the manifolds and from the crossover, and remove
from the vehicle.
NOTE: The exhaust clamps at the manifolds cannot
be reused. New clamps must be used or leaks may
occur.
(38) Remove the structural cover.
(39) Remove torque convertor bolts, and mark
location for reassembly.
(40) Remove transmission bellhousing to engine
bolts.
(41) Remove left and right engine mount thru
bolts.
(42) Lower the vehicle.
(43) Support the transmission with a suitable jack.
(44) Connect a suitable engine hoist to the engine
lift plate.
(45) Remove engine from vehicle.
INSTALLATION
(1) Position the engine in the vehicle.
(2) Install both left and right side engine mounts
onto engine.
(3) Raise the vehicle.
(4) Install the transmission bellhousing to engine
mounting bolts. Tighten the bolts to 41 N´m (30ft.
lbs.).
(5) Tighten the engine mount thru bolts.
(6) Install the torque convertor bolts.
(7) Connect the ground straps on the left and right
side of the engine.
(8) Install the starter.
(9) Connect the crankshaft position sensor.
(10) Install the engine block heater power cable, if
equipped.
CAUTION: The structural cover requires a specific
torque sequence. Failure to follow this sequence
may cause severe damage to the cover.
(11) Install the structural cover.
NOTE: New clamps must be used on exhaust man-
ifold flanges. Failure to use new clamps may result
in exhaust leaks.
(12) Install the left and right exhaust pipes.
(13) Connect the left and right oxygen sensors.
(14) Lower vehicle.
(15) Remove the engine lift plate.
(16) Connect the knock sensors.
DRENGINE - 3.7L 9 - 11
ENGINE - 3.7L (Continued)