PCM INSPECTION [AJ (3.0L Duratec)]

id0140a1802500

Note
• The PCM terminal voltage can vary with the conditions when measuring, and deterioration over time on the vehicle, causing false diagnosis. Therefore a comprehensive determination of where malfunctions are occurring is required for input/output system, or PCM.

1. Disconnect the negative battery cable.

2. Remove the PCM.

3. Connect the powertrain control module (PCM) electrical connector.

4. Connect the negative battery cable.

5. Connect the negative (-) lead of the circuit tester to the body ground.

6. Measure the voltage at each PCM terminal using the (digital) circuit tester.

• If the output voltage is unusual despite normal input voltage, inspect the related systems. If they are normal, replace the PCM.

Terminal Voltage Table (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

ACTION

1
Ignition coil control
Ignition coil
• Ignition coil
• Related wiring harness
2
-
-
-
-
-
3
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
4
-
-
-
-
-
5
-
-
-
-
-
6
Shift solenoid A control
Shift solenoid A
Ignition switch at ON
B+
• Shift solenoid A
• Related wiring harness
While idling
1.0 or less
7
-
-
-
-
-
8
-
-
-
-
-
9
-
-
-
-
-
10
-
-
-
-
-
11
Shift solenoid B control
Shift solenoid B
Ignition switch at ON
1.0 or less
• Shift solenoid B
• Related wiring harness
While idling
1.0 or less
12
-
-
-
-
-
13
-
-
-
-
-
14
-
-
-
-
-
15
CAN (L)
WDS or equivalent
As this terminal is for communication, terminal voltage inspection is not suitable for determination.
Inspect with DTC inspection.
• Related wiring harness
16
CAN (H)
WDS or equivalent
As this terminal is for communication, terminal voltage inspection is not suitable for determination.
Inspect with DTC inspection.
• Related wiring harness
17
Key ID*1
Coil antenna
As this terminal is for communication, terminal voltage inspection is not suitable for determination.
Inspect with DTC inspection.
• Coil antenna
• Related wiring harness
-*2
-
-
-
-
18
Key ID*1
Coil antenna
As this terminal is for communication, terminal voltage inspection is not suitable for determination.
Inspect with DTC inspection.
• Coil antenna
• Related wiring harness
-*2
-
-
-
-
19
-
-
-
-
-
20
3-2 timing/coast clutch solenoid valve control
3-2 timing/coast clutch solenoid valve
Ignition switch at ON
B+
3-2 timing/coast clutch solenoid valve
• Related wiring harness
While idling
B+
21
Engine rotation
(+)
CKP sensor
• CKP sensor
• Related wiring harness
22
Engine rotation
(-)
CKP sensor
• CKP sensor
• Related wiring harness
23
-
-
-
-
-
24
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
25
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
26
Ignition coil control
Ignition coil
• Ignition coil
• Related wiring harness
27
Ignition coil control
Ignition coil
• Ignition coil
• Related wiring harness
28
Low speed control fan relay control
Low speed control fan relay
While idling
Cooling fan on
1.0 or less
• Low speed control fan relay
• Related wiring harness
Cooling fan off
B+
29
Hold
Hold switch
Ignition switch at ON
While hold switch is pressed
1.0 or less
• Hold switch inspection
• Related wiring harness
Except when hold switch is pressed
B+
30
-
-
-
-
-
31
PSP
PSP switch
While idling
Steering wheel neutral
1.0 or less
• PSP switch
• Related wiring harness
While steering wheel is turned
B+
32
Knock (-)
KS
Ignition switch at ON (Use digital voltmeter. Low voltage may be detected with analog type voltmeter.)
1.0 or less
• KS
• Related wiring harness
33
-
-
-
-
-
34
-
-
-
-
-
35
HO2S (Rear, RH)
HO2S (Rear, RH)
Idle after warm-up
Alternates between 0 and 1.0
• HO2S (Rear, RH)
• Related wiring harness
36
Input device ground
MAF sensor
Under any condition
1.0 or less
• MAF sensor
• Related wiring harness
37
ATF temperature
ATF thermo-sensor
Ignition switch at ON
At ATF temperature 20°C
3-4
• ATF thermo-sensor
• Related wiring harness
At ATF temperature 130°C
0.2-0.7
38
ECT
ECT sensor
Ignition switch at ON
ECT is 20°C
Approx. 3.1
• ECT sensor
• Related wiring harness
ECT is 60°C
Approx. 1.4
ECT is 80°C
Approx. 0.9
39
Intake air temperature
IAT sensor
Ignition switch at ON
At IAT 20°C
Approx. 2.5
• IAT sensor
• Related wiring harness
At IAT 30°C
Approx. 1.8
40
Fuel pump operation detection
FPR
Ignition switch at ON
1.0 or less
• FPR
• Related wiring harness
Cranking
B+
While idling
41
A/C signal
Refrigerant pressure switch (low, high pressure), A/C switch
While idling
A/C switch off
B+
• A/C switch
• Refrigerant pressure switch (low, high pressure)
• Related wiring harness
A/C switch and fan switch on
1.0 or less
42
Medium speed control fan relay control
Medium speed control fan relay
While idling
Cooling fan on
1.0 or less
• Medium speed control fan relay
• Related wiring harness
Cooling fan off
B+
43
-
-
-
-
-
44
Starter cut control *1
Starter relay
P or N position
B+
• Starter relay
• Related wiring harness
Except above
1.0 or less
-*2
-
-
-
-
45
-
-
-
-
-
46
High speed control fan relay control
High speed control fan relay No. 1, High speed control fan relay No. 2
While idling
Cooling fan off
B+
• High speed control fan relay
• Related wiring harness
47
EGR control valve control
EGR control valve
While idling
B+
• EGR control valve
• Related wiring harness
48
-
-
-
-
-
49
-
-
-
-
-
50
-
-
-
-
-
51
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
52
Ignition coil control
Ignition coil
• Ignition coil
• Related wiring harness
53
Ignition coil control
Ignition coil
• Ignition coil
• Related wiring harness
54
Torque converter clutch control
Torque converter clutch solenoid valve
Ignition switch at ON
B+
• Torque converter clutch solenoid valve
• Related wiring harness
While idling
B+
55
Backup power supply
Battery
Under any condition
B+
• Battery
• Main fuse
• Related wiring harness
56
Evaporative purge control
Purge solenoid valve
• Purge solenoid valve
• Related wiring harness
57
Knock (+)
KS
Ignition switch at ON (Use digital voltmeter. Low voltage may be detected with analog type voltmeter.)
1.0 or less
• KS
• Related wiring harness
58
-
-
-
-
-
59
Turbine speed
Turbine speed sensor
• Turbine speed sensor
• Related wiring harness
60
Oxygen concentration (Right bank)
HO2S
• HO2S
• Related wiring harness
61
HO2S (Rear, LH)
HO2S (Rear, LH)
Idle after warm-up
Alternates between 0 and 1.0
• HO2S (Rear, LH)
• Related wiring harness
62
-
-
-
-
-
63
-
-
-
-
-
64
TR
TR switch
Ignition switch at ON
P position
Approx. 4.4
• TR switch inspection
• Related wiring harness
R position
Approx. 3.6
N position
Approx. 2.9
D range
Approx. 2.1
2 Range
Approx. 1.4
1 Range
Approx. 0.7
65
EGR flow
Differential pressure feed back EGR sensor
While idling after warm-up
Approx. 1
• Differential pressure feed back EGR sensor
• Related wiring harness
66
-
-
-
-
-
67
-
-
-
-
-
68
-
-
-
-
-
69
A/C control
A/C relay
A/C on
1.0 or less
• A/C relay
• Related wiring harness
70
-
-
-
-
-
71
Power supply
Main relay
Ignition switch at ON
B+
• Main relay
• Related wiring harness
Ignition switch is off.
1.0 or less
72
-
-
-
-
-
73
Fuel injector No.5 control
Fuel injector No.5
• Fuel injector
• Related wiring harness
74
Fuel injector No.3 control
Fuel injector No.3
• Fuel injector
• Related wiring harness
75
Fuel injector No.1 control
Fuel injector No.1
• Fuel injector
• Related wiring harness
76
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
77
-
-
-
-
-
78
Ignition coil control
Ignition coil
• Ignition coil
• Related wiring harness
79
-
-
-
-
-
80
Fuel pump control
FPR
Ignition switch at ON
B+
• FPR
• Related wiring harness
Cranking
1.0 or less
While idling
81
Electronic pressure control solenoid control
Electronic pressure control solenoid
• Output shaft speed sensor
• Related wiring harness
82
-
-
-
-
-
83
IAC control
IAC solenoid valve
• IAC solenoid valve
• Related wiring harness
84
Output shaft speed
Output shaft speed sensor
• Output shaft speed sensor
• Related wiring harness
85
Cylinder identification
CMP sensor
• CMP sensor
• Related wiring harness
86
Refrigerant pressure signal (medium pressure)
Refrigerant pressure switch (medium pressure)
While idling
Refrigerant pressure is 2.06 MPa or more
1.0 or less
• Refrigerant pressure switch (medium pressure)
• Related wiring harness
Refrigerant pressure is 1.77 MPa or less
B+
87
Oxygen concentration (Left bank)
HO2S
• HO2S
• Related wiring harness
88
Intake air amount
MAF sensor
Ignition switch at ON
Approx. 0
• MAF sensor
• Related wiring harness
After warm-up, while idling (no electrical load, A/C off, P/S off)
Approx. 0.7
89
Throttle position
TP sensor
Ignition switch at ON
Accelerator closed
Approx. 0.9
• TP sensor
• Related wiring harness
Accelerator fully opened
Approx. 4.7
90
Constant voltage power supply
TP sensor, differential pressure feedback EGR sensor
Ignition switch
On
Approx. 5.0
• TP sensor
• Differential pressure feedback EGR sensor
• Related wiring harness
91
Input device ground
TP sensor, IAT/MAF sensor, HO2S, Differential pressure feedback EGR sensor, ECT sensor, ATF temperature sensor, TR switch sensor
Under any condition
1.0 or less
• Related wiring harness
92
Brake
Brake switch
When brake pedal is depressed
B+
• Brake switch
• Related wiring harness
Except above
1.0 or less
93
HO2S heater control (Right bank)
HO2S
• HO2S
• Related wiring harness
94
HO2S heater control (Right bank)
HO2S
• HO2S
• Related wiring harness
95
HO2S heater (Rear, RH) control
HO2S heater (Rear, RH)
Heavy load (Heater control not operating)
B+
• HO2S heater (Rear, RH)
• Related wiring harness
96
HO2S heater (Rear, LH) control
HO2S heater (Rear, LH)
Heavy load (Heater control not operating)
B+
• HO2S heater (Rear, LH)
• Related wiring harness
97
Power supply
Main relay
Ignition switch at ON
B+
• Main relay
• Related wiring harness
Ignition switch is off.
1.0 or less
A/C off

B+

98
-
-
-
-
-
99
Fuel injector No.6 control
Fuel injector No.6
• Fuel injector
• Related wiring harness
100
Fuel injector No.4 control
Fuel injector No.4
• Fuel injector
• Related wiring harness
101
Fuel injector No.2 control
Fuel injector No.2
• Fuel injector
• Related wiring harness
102
-
-
-
-
-
103
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
104
-
-
-
-
-

*1 :
With immobilizer system
*2 :
Without immobilizer system

Inspection Using An Oscilloscope (Reference)

Ignition coil control signal

• Connection terminals:
No.1 cylinder: 26 (+)-Body ground (-)
No.2 cylinder: 52 (+)-Body ground (-)
No.3 cylinder: 78 (+)-Body ground (-)
No.4 cylinder: 1 (+)-Body ground (-)
No.5 cylinder: 27 (+)-Body ground (-)
No.6 cylinder: 53 (+)-Body ground (-)
• Instrument setting: 5 V/DIV (Y), 10 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

Engine speed signal

(+)

• Connection terminal: 21 (+)-Body ground (-)
• Instrument setting: 2 V/DIV (Y), 5 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)
(-)

• Connection terminal: 22 (+)-Body ground (-)
• Instrument setting: 2 V/DIV (Y), 5 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

Purge solenoid valve control signal

• Connection terminal: 56 (+)-Body ground (-)
• Instrument setting: 2 V/DIV (Y), 10 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

Turbine speed signal

• Connection terminal: 59 (+)-Body ground (-)
• Instrument setting: 2 V/DIV (Y):10 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

Oxygen concentration signal

• Connection terminals:
Right bank: 60 (+)-Body ground (-)
Right bank: 87 (+)-Body ground (-)
• Instrument setting: 0.1 V/DIV (Y), 1 s/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

Fuel injector control signals

• Connection terminals:
No. 1:75 (+)-Body ground (-)
No. 2:101 (+)-Body ground (-)
No. 3:74 (+)-Body ground (-)
No. 4:100 (+)-Body ground (-)
No. 5:73 (+)-Body ground (-)
No. 6:99 (+)-Body ground (-)
• Instrument setting: 4 V/DIV (Y), 10 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

Electronic pressure control solenoid control

• Connection terminal: 81 (+)-Body ground (-)
• Instrument setting: 2 V/DIV (Y), 0.2 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

IAC control signal

• Connection terminal: 83 (+)-Body ground (-)
• Instrument setting: 2 V/DIV (Y), 0.4 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

Cylinder identification signal

• Connection terminal: 85 (+)-Body ground (-)
• Instrument setting: 0.5 V/DIV (Y), 20 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

HO2S heater control signal

• Connection terminals:
Right bank: 93 (+)-Body ground (-)
Left bank: 94 (+)-Body ground (-)
• Instrument setting: 2 V/DIV (Y):200 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)