PCM INSPECTION[AJ (3.0L Duratec)]

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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)

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Terminal	Signal name	Connected to	Measurement condition		Voltage (V)	Inspection item
1	Ignition coil control	Ignition coil	(See Inspection Using An Oscilloscope (Reference).)			•  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	Solenoid valve operating		B+	•  Shift solenoid A •  Related wiring harness
			Solenoid valve not operating		1.0 or less
7	—	—	—		—	—
8	—	—	—		—	—
9	—	—	—		—	—
10	—	—	—		—	—
11	Shift solenoid B control	Shift solenoid B	Solenoid valve operating		B+	•  Shift solenoid B •  Related wiring harness
			Solenoid valve not operating		1.0 or less
12	—	—	—		—	—
13	—	—	—		—	—
14	—	—	—		—	—
15	BUS-	M-MDS	As this terminal is for communication, terminal voltage inspection is not suitable for determination.Inspect with DTC inspection.			•  Related wiring harness
16	BUS+	M-MDS	As this terminal is for communication, terminal voltage inspection is not suitable for determination.Inspect with DTC inspection.			•  Related wiring harness
17	Key ID	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
18	Key ID	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
19	—	—	—		—	—
20	3-2 timing/coast clutch solenoid valve control	3-2 timing/coast clutch solenoid valve	Solenoid valve operating		B+	•  3-2 timing/coast clutch solenoid valve •  Related wiring harness
			Solenoid valve not operating		1.0 or less
21	Engine rotation (+)	CKP sensor	(See Inspection Using An Oscilloscope (Reference).)			•  CKP sensor •  Related wiring harness
22	Engine rotation (–)	CKP sensor	(See Inspection Using An Oscilloscope (Reference).)			•  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	(See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil •  Related wiring harness
27	Ignition coil control	Ignition coil	(See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil •  Related wiring harness
28	Low speed control fan relay control	Cooling fan relay No.2	While idling	Cooling fan on	1.0 or less	•  Cooling fan relay No.2 •  Related wiring harness
				Cooling fan off	B+
29	O/D OFF	O/D OFF switch	Ignition switch at ON	While O/D OFF switch is pressed	B+	•  O/D OFF switch inspection •  Related wiring harness
				Except when O/D OFF switch is pressed	1.0 or less
30	—	—	—		—	—
31	PSP	PSP switch	While idling	Steering wheel neutral	B+	•  PSP switch •  Related wiring harness
				While steering wheel is turned	1.0 or less
32	—	—	—		—	—
33	—	—	—		—	—
34	—	—	—		—	—
35	Rear HO2S (RH)	Rear HO2S (RH)	Idle after warm-up		Alternates between 0 and 1.0	•  Rear HO2S (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	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
38	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
39	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
40	Fuel pump operation detection	Fuel pump relay	Ignition switch at ON		1.0 or less	•  Fuel pump relay •  Related wiring harness
			Cranking		B+
			While idling
41	A/C signal	Refrigerant pressure switch (low, high pressure), A/C switch	While idling	A/C on	1.0 or less	•  A/C switch •  Refrigerant pressure switch (low, high pressure) •  Related wiring harness
				A/C off	B+
42	—	—	—		—	—
43	—	—	—		—	—
44	Starter cut control	Starter relay	P or N position		B+	•  Starter relay •  Related wiring harness
			Except above		1.0 or less
45	—	—	—		—	—
46	High speed control fan relay control	Cooling fan relay No.1, Cooling fan relay No.3	While idling	Cooling fan on	1.0 or less	•  Cooling fan relay No.1, Cooling fan relay No.3 •  Related wiring harness
				Cooling fan off	B+
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	(See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil •  Related wiring harness
53	Ignition coil control	Ignition coil	(See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil •  Related wiring harness
54	Torque converter clutch control	Torque converter clutch solenoid valve	Solenoid valve operating		B+	•  Torque converter clutch solenoid valve •  Related wiring harness
			Solenoid valve not operating		1.0 or less
55	Backup power supply	Battery	Under any condition		B+	•  Battery •  Main fuse •  Related wiring harness
56	Evaporative purge control	Purge solenoid valve	(See Inspection Using An Oscilloscope (Reference).)			•  Purge solenoid valve •  Related wiring harness
57	—	—	—		—	—
58	—	—	—		—	—
59	Turbine speed	TSS sensor	(See Inspection Using An Oscilloscope (Reference).)			•  TSS sensor •  Related wiring harness
60	Front HO2S (RH)	Front HO2S (RH)	(See Inspection Using An Oscilloscope (Reference).)			•  Front HO2S (RH) •  Related wiring harness
61	Rear HO2S (LH)	Rear HO2S (LH)	Idle after warm-up		Alternates between 0 and 1.0	•  Rear HO2S (LH) •  Related wiring harness
62	—	—	—		—	—
63	—	—	—		—	—
64	TR	TR switch	Ignition switch at ON	P position	Approx. 4.4	•  TR switch •  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	D.P.F. EGR sensor	While idling after warm-up		Approx. 1	•  D.P.F. 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	(See Inspection Using An Oscilloscope (Reference).)			•  Fuel injector •  Related wiring harness
74	Fuel injector No.3 control	Fuel injector No.3	(See Inspection Using An Oscilloscope (Reference).)			•  Fuel injector •  Related wiring harness
75	Fuel injector No.1 control	Fuel injector No.1	(See Inspection Using An Oscilloscope (Reference).)			•  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	(See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil •  Related wiring harness
79	—	—	—		—	—
80	Fuel pump control	Fuel pump relay	Ignition switch at ON		B+	•  Fuel pump relay •  Related wiring harness
			Cranking		1.0 or less
			While idling
81	Electronic pressure control solenoid control	Electronic pressure control solenoid	(See Inspection Using An Oscilloscope (Reference).)			•  Electronic pressure control solenoid •  Related wiring harness
82	—	—	—		—	—
83	IAC control	IAC solenoid valve	(See Inspection Using An Oscilloscope (Reference).)			•  IAC solenoid valve •  Related wiring harness
84	Output shaft speed	Output shaft speed sensor	(See Inspection Using An Oscilloscope (Reference).)			•  Output shaft speed sensor •  Related wiring harness
85	Cylinder identification	CMP sensor	(See Inspection Using An Oscilloscope (Reference).)			•  CMP sensor •  Related wiring harness
86	Refrigerant pressure signal (medium pressure)	Refrigerant pressure switch (medium pressure)	While idling	Refrigerant pressure is more than the specification	1.0 or less	•  Refrigerant pressure switch (medium pressure) •  Related wiring harness
				Refrigerant pressure is less than the specification	B+
87	Front HO2S (LH)	Front HO2S (LH)	(See Inspection Using An Oscilloscope (Reference).)			•  Front HO2S (LH) •  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, D.P.F. EGR sensor	Ignition switch On		Approx. 5.0	•  TP sensor •  D.P.F. EGR sensor •  Related wiring harness
91	Input device ground	TP sensor, MAF/IAT sensor, HO2S, D.P.F. EGR sensor, ECT sensor, TFT 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	Front HO2S heater (RH) control	Front HO2S heater (RH)	(See Inspection Using An Oscilloscope (Reference).)			•  Front HO2S (RH) •  Related wiring harness
94	Front HO2S heater (LH) control	Front HO2S heater (LH)	(See Inspection Using An Oscilloscope (Reference).)			•  Front HO2S (RH) •  Related wiring harness
95	Rear HO2S heater (RH) control	Rear HO2S heater (RH)	Heavy load (Heater control not operating)		B+	•  Rear HO2S (RH) heater •  Related wiring harness
96	Rear HO2S heater (LH) control	Rear HO2S heater (LH)	Heavy load (Heater control not operating)		B+	•  Rear HO2S (LH) heater •  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	(See Inspection Using An Oscilloscope (Reference).)			•  Fuel injector •  Related wiring harness
100	Fuel injector No.4 control	Fuel injector No.4	(See Inspection Using An Oscilloscope (Reference).)			•  Fuel injector •  Related wiring harness
101	Fuel injector No.2 control	Fuel injector No.2	(See Inspection Using An Oscilloscope (Reference).)			•  Fuel injector •  Related wiring harness
102	—	—	—		—	—
103	Ground	Ground	Under any condition		1.0 or less	•  Related wiring harness
104	—	—	—		—	—

Inspection Using An Oscilloscope (Reference)

Ignition coil control signal

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•  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

(+)

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•  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)

(–)

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•  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

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•  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

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•  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

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•  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

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•  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

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•  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

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•  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

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•  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

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•  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)