PCM INSPECTION [L3 R.H.D.]

id0140a7802500

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 PCM 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

Connected to

Measurement condition

Voltage (V)

Inspection item

1
-
-
-
-
-
2
-
-
-
-
-
3
-
-
-
-
-
4
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
5
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
6
-
-
-
-
-
7
-
-
-
-
-
8
-
-
-
-
-
9
-
-
-
-
-
10
-
-
-
-
-
11
Fan control
FC module
• FC module
• Related wiring harness
12
Vehicle speed output
Instrument cluster
(Speedometer)
• Instrument cluster
• Related wiring harness
13
Security light control *1
Instrument cluster
(Security light)
While the security light is illuminated
1.0 or less
• Instrument cluster
• Related wiring harness
Except above
B+
-*2
-
-
-
-
14
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
15
-
-
-
-
-
16
CAN (H)
WDS or equivalent
Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.
• Related wiring harness
17
CAN (L)
WDS or equivalent
Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.
• Related wiring harness
18
-
-
-
-
-
19
Hold
Hold switch
Ignition switch at ON
While hold switch is pressed
1.0 or less
• Hold switch
• Related wiring harness
Except when hold switch is pressed
B+
20
S range
TR switch
Ignition switch at ON
Except S range
1.0 or less
• TR switch
• Related wiring harness
S range
B+
21
With/without load determination
TR switch (P or N position)
Ignition switch at ON
P or N position
1.0 or less
• TR switch
• Related wiring harness
Except above
B+
22
ATF temperature
TFT sensor
Ignition switch at ON
At ATF temperature 20°C{68°F}
3-4
• TFT sensor
• Related wiring harness
At ATF temperature 130°C{266°F}
0.2-0.7
23
Intake air temperature
IAT sensor
Ignition switch at ON
At IAT 20°C{68°F}
Approx. 2.5
• IAT sensor
• Related wiring harness
At IAT 30°C{86°F}
Approx. 1.8
24
Intake air pressure
MAP sensor
While idling after warm-up
Approx. 1.5
• MAP sensor
• Related wiring harness
25
Input device ground
TP sensor, IAT/MAF sensor, HO2S, MAP sensor, ECT sensor, ATF temperature sensor
Under any condition
1.0 or less
• Related wiring harness
26
-
-
-
-
-
27
-
-
-
-
-
28
-
-
-
-
-
29
-
-
-
-
-
30
EGR control
EGR valve (Terminal A)
While idling
B+
• EGR valve
• Related wiring harness
31
EGR control
EGR valve (Terminal F)
While idling
1.0 or less
• EGR valve
• Related wiring harness
32
Variable intake air control
Variable intake air solenoid valve
Ignition switch at ON
B+
• Variable intake air solenoid valve
• Related wiring harness
Engine speed less than 4,750 rpm
B+
Engine speed 4,750 rpm or more
1.0 or less
33
Starter cut control *1
Starter relay
P or N position
B+
• Starter relay
• Related wiring harness
Except above
1.0 or less
-*2
-
-
-
-
34
-
-
-
-
-
35
-
-
-
-
-
36
Internal ground
Main
Relay
Ignition switch is off.
1.0 or less
• Main relay
• Related wiring harness
37
-
-
-
-
-
38
Fuel pump control *1
Fuel pump relay
Ignition switch at ON
B+
• Fuel pump relay
• Related wiring harness
Cranking
1.0 or less
While idling
-*2
-
-
-
-
39
3-2 timing solenoid valve control
3-2 timing solenoid valve
At 3-2 timing solenoid valve operation
B+
3-2 timing solenoid valve
• Related wiring harness
Except above
1.0 or less
40
Shift solenoid C control
Shift solenoid C
At Shift solenoid C operation
B+
• Shift solenoid C
• Related wiring harness
Except above
1.0 or less
41
-
-
-
-
-
42
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
-
-
-
-
43
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
-
-
-
-
44
-
-
-
-
-
45
-
-
-
-
-
46
D range
TR switch
Ignition switch at ON
Except D range
1.0 or less
• TR switch
• Related wiring harness
D range
B+
47
PSP
PSP switch
While idling
Steering wheel neutral
B+
• PSP switch
• Related wiring harness
While steering wheel is turned
1.0 or less
48
-
-
-
-
-
49
-
-
-
-
-
50
Intake air amount
MAF sensor
Ignition switch at ON
Approx. 0.7
• MAF sensor
• Related wiring harness
After warm-up, while idling (no electrical load, A/C off, P/S off)
Approx. 1.3
51
Input device ground
MAF sensor
Under any condition
1.0 or less
• MAF sensor
• Related wiring harness
52
-
-
-
-
-
53
Ignition coil control
Ignition coil
• Ignition coil
• Related wiring harness
54
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
55
-
-
-
-
-
56
EGR control
EGR valve (Terminal E)
While idling
1.0 or less
• EGR valve
• Related wiring harness
57
EGR control
EGR valve (Terminal B)
While idling
1.0 or less
• EGR valve
• Related wiring harness
58
Variable tumble control
Variable tumble solenoid valve
Ignition switch at ON
While idling after cold start
1.0 or less
• Variable tumble solenoid valve
• Related wiring harness
At hot restart
B+
59
Purge solenoid valve control
Purge solenoid valve
• Purge solenoid valve
• Related wiring harness
60
-
-
-
-
-
61
Field coil control
Generator (Terminal D)
• Generator
• Related wiring harness
62
-
-
-
-
-
63
A/C control
A/C relay
A/C on
1.0 or less
• A/C relay
• Related wiring harness
A/C off
B+
64
-*1
-
-
-
-
Fuel pump control *2
Fuel pump relay
Ignition switch at ON
B+
• Fuel pump relay
• Related wiring harness
Cranking
1.0 or less
While idling
65
TCC control solenoid control
TCC control solenoid
Lock-up engagement
B+
• TCC control solenoid
• Related wiring harness
Except above
1.0 or less
66
Shift solenoid B control
Shift solenoid B
Shift solenoid B operated
B+
• Shift solenoid B
• Related wiring harness
Except above
1.0 or less
67
Input/turbine speed sensor (-)
Input/turbine speed sensor
• Input/turbine speed sensor
• Related wiring harness
68
Engine rotation
(-)
CKP sensor
• CKP sensor
• Related wiring harness
69
Cylinder identification (-)
CMP sensor
• CMP sensor
• Related wiring harness
70
Knock (-)
KS
Ignition switch at ON (Use digital voltmeter. Low voltage may be detected with analog type voltmeter.)
Approx. 3.2
• KS
• Related wiring harness
71
Brake
Brake switch
When brake pedal is depressed
B+
• Brake switch
• Related wiring harness
When brake pedal is not depressed
1.0 or less
72
R position
TR switch
Ignition switch at ON
Except R position
1.0 or less
• TR switch
• Related wiring harness
R position
B+
73
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+
74
-
-
-
-
-
75
ECT
ECT sensor
Ignition switch at ON
ECT is 20°C{68°F}
Approx. 3.1
• ECT sensor
• Related wiring harness
ECT is 60°C{140°F}
Approx. 1.4
ECT is 80°C{176°F}
Approx. 0.9
76
Throttle position
TP sensor
Ignition switch at ON
Accelerator closed
0.65-1.15
• TP sensor
• Related wiring harness
Accelerator fully opened
4.3-4.8
77
-
-
-
-
-
78
Backup power supply
Battery
Under any condition
B+
• Battery
• Main fuse
• Related wiring harness
79
Ignition coil control
Ignition coil
• Ignition coil
• Related wiring harness
80
Ground
Ground
Under any condition
1.0 or less
• Related wiring harness
81
-
-
-
-
-
82
Fuel injector No.1 control
Fuel injector No.1
• Fuel injector
• Related wiring harness
83
Fuel injector No.2 control
Fuel injector No.2
• Fuel injector
• Related wiring harness
84
Fuel injector No.3 control
Fuel injector No.3
• Fuel injector
• Related wiring harness
85
Fuel injector No.4 control
Fuel injector No.4
• Fuel injector
• Related wiring harness
86
HO2S heater control
HO2S
• HO2S
• Related wiring harness
87
-
-
-
-
-
88
IAC control
IAC valve
• IAC valve
• Related wiring harness
89
IAC power supply
IAC valve
• IAC valve
• Related wiring harness
90
-
-
-
-
-
91
Pressure control solenoid valve control
Pressure control solenoid valve
• Pressure control solenoid valve
• Related wiring harness
92
Shift solenoid A control
Shift solenoid A
Shift solenoid A operated
B+
• Shift solenoid A
• Related wiring harness
Except above
1.0 or less
93
Input/turbine speed sensor (+)
Input/turbine speed sensor
• Input/turbine speed sensor
• Related wiring harness
94
Engine rotation
(+)
CKP sensor
• CKP sensor
• Related wiring harness
95
Cylinder identification (+)
CMP sensor
• CMP sensor
• Related wiring harness
96
Knock (+)
KS
Ignition switch at ON (Use digital voltmeter. Low voltage may be detected with analog type voltmeter.)
Approx. 4.7
• KS
• Related wiring harness
97
A/C signal
Refrigerant pressure switch (low, high pressure), A/C switch
While idling
A/C switch off
1.0 or less
• A/C switch
• Refrigerant pressure switch (low, high pressure)
• Related wiring harness
A/C switch and pressure switch on
B+
98
L range
TR switch
Ignition switch at ON
Except L range
1.0 or less
• TR switch
• Related wiring harness
L range
B+
99
Generator output voltage
Generator (Terminal P)
• Generator
• Related wiring harness
100
Oxygen concentration
HO2S
• HO2S
• Related wiring harness
101
Constant voltage power supply
TP sensor, MAP sensor
Ignition switch
On
Approx. 5.0
• TP sensor
• MAP sensor
• Related wiring harness
102
-
-
-
-
-
103
Battery voltage input
Main
relay
Ignition switch is off.
1.0 or less
• Main relay
• Related wiring harness
Ignition switch at ON
B+
104
Battery voltage input
Main
relay
Ignition switch is off.
1.0 or less
• Main relay
• Related wiring harness
Ignition switch at ON
B+

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

Inspection Using An Oscilloscope (Reference)

Fan control signal

• Connection terminal: 11(+) - Body ground (-)
• Instrument setting: 1V/DIV (Y), 0.1 ms/DIV (X), DC range
• Measurement condition: After warm-up, A/C on (Refrigerant pressure signal off)

Vehicle speed input signal

• Connection terminal: 12(+) - Body ground (-)
• Instrument setting: 1V/DIV (Y), 25 ms/DIV (X), DC range
• Measurement condition: Vehicle speed approx. 60 km/h

Purge solenoid valve control 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, purge solenoid valve on)

Field coil control signal

• Connection terminal: 61(+) - Body ground (-)
• Instrument setting: 0.5 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)

Input/turbine speed sensor signal

• Connection terminals: 93(+) - 67(-)
• Instrument setting: 1 V/DIV (Y), 2 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: 94(+) - Body ground (-)
• Instrument setting: 2 V/DIV (Y), 4 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)
(-)

• Connection terminal: 68(+) - Body ground (-)
• Instrument setting: 2 V/DIV (Y), 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: 95(+) - Body ground (-)
• Instrument setting: 1 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)
(-)

• Connection terminal: 69(+) - Body ground (-)
• Instrument setting: 1 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)

Ignition coil control signals

• Connection terminals:
No.1 and 4 cylinders: 79(+) - Body ground (-)
No.2 and 3 cylinders: 53(+) - Body ground (-)
• Instrument setting: 4 V/DIV (Y), 0.01 ms/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: 82(+) - Body ground (-)
No.2: 83(+) - Body ground (-)
No.3: 84(+) - Body ground (-)
No.4: 85(+) - 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)

HO2S heater control signal

• Connection terminal: 86(+) - Body ground (-)
• Instrument setting: 4 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 power source signal

• Connection terminal: 89(+) - Body ground (-)
• Instrument setting: 2V/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)

IAC control signal

• Connection terminal: 88(+) - Body ground (-)
• Instrument setting: 2V/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)

Pressure control solenoid valve signal

• Connection terminal: 91(+) - 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)

Generator output voltage signal

• Connection terminal: 99(+) - Body ground (-)
• Instrument setting: 2V/DIV (Y), 2ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)

Oxygen concentration signal

• Connection terminal: 100(+) - Body ground (-)
• Instrument setting: 0.1 V/DIV (Y), 400 ms/DIV (X), DC range
• Measurement condition: After warm-up, while idling (no electrical load, A/C off, P/S off)