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ENGINE CONTROLS
Circuit Schematic
23-5
See Ground
Distribution,
page 14-4.
E-5
E-32
E-32
CAMSHAFT
POSITION
(CMP)
SENSOR
BLU
GRN
E-5
1
THROTTLE
POSITION
(TP)
SENSOR
2
RED
GRN
E-43
E-43
2
INTAKE AIR
TEMPERATURE
(IAT) SENSOR
1
YEL/GRN
GRN
POWERTRAIN
CONTROL
MODULE
(PCM)
Solid-state:
Do not check
resistance.
C-2
H-5
C-2
D8
C-3
E8
CMP
sensor
input
CKP
sensor
input
TP
sensor
input
Sensor
ground
H-4
BLU
GRN
BLU
GRN
E-27
E-27
CRANKSHAFT
POSITION
(CKP) SENSOR
H-5
YEL/RED
YEL/RED
YEL/RED
Reference
YEL
C5
10
GRN
C-3
E11
RED
C-1
B8
IAT
sensor
input
GRN
3
2
1
3
3
2
1
9
11
6
5
YEL/RED
YEL/RED
BLU
6
5
POWERTRAIN
CONTROL
MODULE
(PCM)
Solid-state:
Do not check
resistance.
C-1
B16
YEL/VIO
H-5
13
Gauges
See Ground
Distribution,
page 14-4.
Fuel
gauge
control
BLK/RED
BLK/PNK
BLK
See Ground
Distribution,
page 14-5.
YEL
WHT
D11
BLK
BLK/RED
E-28
BLK
BLK/RED
H-5
C-2
BLK/PNK
BLK/RED
13
E-30
BLK/
BLU
YEL/VIO
B5
Fuel tank
unit input
Fuel level
indication
system
BLK/
RED
BLK
BLK
BLK
BLK/RED
CMP
sensor
input
Torque-on-
Demand
(T.O.D.)
system
BLU
BLU
E-28
ENGINE CONTROLS
Circuit Schematic
23-6
C-3
C-1
C-2
C-1
C-2
C-1
C-2
CB-4
METER
10A
YEL
DASH
FUSE
BOX
B4
RED/
GRN
H-5
7
B-8
14
See Dash
Fuse Box,
page 11-5.
YEL
Indicators
MALFUNCTION
INDICATOR
“CHECK ENGINE”
LIGHT
METER
ASSEMBLY
C-1
A13
H-13
22
BLU
B-8
12
D5
RED/
YEL
8
B2
RED/
WHT
1
D6
RED/
BLU
2
B3
RED/
BLK
3
C4
RED
4
Ignition System
E15
GRN
B14
GRY/
RED
A/C
Compressor
Controls
HOT IN ON OR START
A2
YEL
E-14
MIL control
A/C
compressor
relay control
A/C on
input
B11
C-1
GRN/YEL
E-4
POWER
STEERING
PRESSURE
(PSP) SWITCH
Switch closes at 3430 kPa (500 psi)
Switch opens at 2940 kPa (430 psi)
C10
BLK/RED
RPM
output
D7
LT GRN/WHT
VSS input
Vehicle
Speed
Sensor
(VSS)
Gauges
PSP switch input
KS input
KNOCK
SENSOR
(KS)
13
BLK/PNK
BLK/RED
13
YEL
RED/
GRN
RED/
YEL
RED/
WHT
RED/
BLU
RED/
BLK
RED
BLK
Ignition coils control
16
H-4
GRN/YEL
See Ground
Distribution,
page 14-4.
BLK/RED
BLU
E-30
BLK/BLU
H-5
E-28
See Ground
Distribution,
page 14-5.
LOW
FUEL
INDICATOR
LIGHT
B15
17
PNK
B-5
11
Low fuel
indicator
light control
PNK
BLK
H-14
H-25
10
YEL
BLK/RED
BLK
BLK
C-2
POWERTRAIN
CONTROL
MODULE
(PCM)
Solid-state:
Do not check
resistance.
B12
GRN/YEL
Headlights
ON input
Lighting
Switch
Details
Component Location Index
(Refer to Section 201 for photographs.)
Component
Photo No.
Camshaft Position (CMP)
Sensor
On top left rear of engine
33
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Crankshaft Position (CKP)
Sensor
Lower right side of engine, above oil pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
93
. . . . . . . . . . . . . . . . . .
Dash Fuse Box
Behind left I/P side trim panel
36
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Link Connector (DLC)
C-63
Below left side of I/P, near engine hood release
38
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Coolant Temperature
(ECT) Sensor
Top front of engine
29
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporative Emission (EVAP)
Canister Cut Valve
Underneath vehicle, above right side of rear axle
87
. . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporative Emission (EVAP)
Canister Purge Valve
Top left front of engine
26
. . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust Gas Recirculation
(EGR) Solenoid Valve
Top right rear of engine
32
. . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump Relay
Right side of engine compartment, in fuse/relay box
19
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
Fuel Vapor Pressure Sensor
On top of fuel tank
. . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse/Relay Box
Right side of engine compartment, on inner fender panel
18
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
Heated Oxygen Sensor
(HO2S) (B1S1)
In right exhaust down pipe
80
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heated Oxygen Sensor
(HO2S) (B2S1)
In left exhaust down pipe
77
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heated Oxygen Sensor
(HO2S) (B1S2)
In rear of right catalytic converter
81
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heated Oxygen Sensor
(HO2S) (B2S2)
In rear of left catalytic converter
79
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Idle Air Control (IAC) Valve
Top front of engine, on air intake assembly
25
. . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intake Air Temperature (IAT)
Sensor
Top front of engine, in air intake hose
25
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intake Air Vacuum Switching
Valve
On left rear of engine
28
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Knock Sensor (KS)
On top of engine, below common chamber
34
. . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manifold Absolute Pressure
(MAP) Sensor
On top rear of engine
32
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mass Air Flow (MAF)
Sensor
Left front corner of engine compartment
12
. . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No. 1 Fuel Injector
Right side of engine
30
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No. 2 Fuel Injector
Left side of engine
28
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No. 3 Fuel Injector
Right side of engine
30
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No. 4 Fuel Injector
Left side of engine
28
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No. 5 Fuel Injector
Right side of engine
30
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
No. 6 Fuel Injector
Left side of engine
28
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCM Main Relay
Right side of engine compartment, in fuse/relay box
21
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
Power Steering Pressure
(PSP) Switch
Lower left front of engine compartment
. . . . . . . . . . . . .
Powertrain Control Module
(PCM)
Behind front console
52
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Throttle Position (TP) Sensor
Top front of engine, on air intake assembly
25
. .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23-7
ENGINE CONTROLS
23-8
ENGINE CONTROLS
Component Location Index
(Refer to Section 201 for photographs.)
Connector
Photo No.
B-5 (16-WHT)
Behind left side of I/P, on rear of meter assembly
49
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
B-8 (16-BLK)
Behind left side of I/P, on rear of meter assembly
49
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
E-4 (1-GRY)
Lower left side of engine compartment
14
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E-9 (7-WHT)
On left front of engine, taped to harness
27
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F-4 (2-BLK)
Beneath rear of vehicle, right of fuel tank
89
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-4 (16-BLU)
Left rear of engine compartment on bracket
15
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-5 (16-GRN)
Left rear of engine compartment on bracket
15
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-6 (16-BLK)
Left rear of engine compartment on bracket
15
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-7 (16-BLK)
Lower left front of engine compartment
13
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-13 (22-WHT)
Behind left side of I/P, above left kick panel on bracket
42
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
H-14 (22-BLU)
Behind left side of I/P, above left kick panel on bracket
42
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
H-16 (20-WHT)
In floor, below right front seat
66
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
H-18 (20-WHT)
Behind I/P right side panel
58
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M-17 (4-BLK)
Right front side of transmission
80
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M-18 (4-BLK)
Left front side of transmission
77
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M-19 (4-BLK)
Right rear side of transmission
81
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M-20 (4-BLK)
Left rear side of transmission
79
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground
C-16
Left rear of engine compartment, on inner fender panel
16
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
C-31
Behind right kick panel
57
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-39
Right rear of engine compartment on inner fander
23
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
E-28
Top left rear of engine
28
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E-30
Top right rear of engine
32
. . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Operation
The Powertrain Control Module (PCM) receives inputs
from the engine sensors and switches, controlling the
functions of the engine. The PCM also turns on the
“CHECK ENGINE” malfunction indicator lamp whenev-
er a malfunction or abnormal engine performance is de-
tected, and allows for diagnostic testing through the
data link connector (DLC).
Refer to Section 6 of Workshop Manual for further
engine diagnosis.
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