PCM INSPECTION [L8, LF]

id0140i7802500

Not Using the M-MDS

Note

•  The PCM terminal voltage can vary with the conditions when measuring and changes due to aged deterioration on the vehicle, causing false diagnosis. Therefore determine comprehensively where the malfunction occurs among the input systems, output systems, and the PCM.

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Terminal	Signal	Connected to	Test condition		Voltage (V)	Inspection item
1A	—	—	—		—	—
1B	Starter relay control	Starter relay	Under any condition		Below 1.0	•  Starter relay •  Related wiring harness
1C	—	—	—		—	—
1D*1	Clutch operation	CPP switch	Clutch pedal depressed		Below 1.0	•  CPP switch •  Related wiring harness
			Clutch pedal released		B+
1E	—	—	—		—	—
1F	—	—	—		—	—
1G	—	—	—		—	—
1H	Fuel pump control	Fuel pump relay	Ignition switch is turned to the ON position (Engine off) and a certain period has elapsed		B+	•  Fuel pump relay •  Related wiring harness
			Cranking		Below 1.0
			Idle		Below 1.0
1I	A/C	A/C relay	Engine running	A/C operating	Below 1.0	•  A/C relay •  Related wiring harness
				A/C not operating	B+
1J	Refrigerant pressure switch (middle)	Refrigerant pressure switch (middle)	Refrigerant pressure is more than the specification. (Refrigerant pressure switch (middle) is on.)		Below 1.0	•  Refrigerant pressure switch (middle) •  Related wiring harness
			Refrigerant pressure is less than the specification. (Refrigerant pressure switch (middle) is off.)		B+
1K	—	—	—		—	—
1L	—	—	—		—	—
1M	Cooling fan control	Cooling fan relay No.1	Cooling fan not operating		B+	•  Cooling fan relay No.1 •  Related wiring harness
			Cooling fan operating		Below 1.0
1N	Cooling fan control	Cooling fan relay No.2	Cooling fan not operating		B+	•  Cooling fan relay No.2 •  Related wiring harness
			Cooling fan operating		Below 1.0
1O	—	—	—		—	—
1P	MAF sensor ground	MAF sensor	Under any condition		Below 1.0	•  Related wiring harness
1Q	Main relay control	Main relay	Ignition switch is turned to the ON position		Below 1.0	•  Main relay •  Related wiring harness
			Ignition switch off and a certain period has elapsed		B+
1R	Cooling fan control	Cooling fan relay No.3	Cooling fan not operating		B+	•  Cooling fan relay No.3 •  Related wiring harness
			Cooling fan operating		Below 1.0
1S	—	—	—		—	—
1T	—	—	—		—	—
1U	—	—	—		—	—
1V	—	—	—		—	—
1W	—	—	—		—	—
1X	Neutral position*1	Neutral switch	Shift lever is at neutral position		Below 1.0	•  Neutral switch •  Related wiring harness
			Shift lever is not at neutral position		B+
	Selector lever position*2	TR switch	Ignition switch is turned to the ON position	P, N position	Below 1.0	•  TR switch •  Related wiring harness
				Except above	B+
1Y	—	—	—		—	—
1Z	—	—	—		—	—
1AA	—	—	—		—	—
1AB	Brake switch 1	Brake switch (No.1 signal)	Brake pedal depressed		B+	•  Brake switch (No.1 signal) •  Related wiring harness
			Brake pedal released		Below 1.0
1AC	—	—	—		—	—
1AD	—	—	—		—	—
1AE	—	—	—		—	—
1AF*5	Brake switch 2	Brake switch (No.2 signal)	Brake pedal depressed		B+	•  Brake switch (No.2 signal) •  Related wiring harness
			Brake pedal released		Below 1.0
1AG	—	—	—		—	—
1AH	—	—	—		—	—
1AI	CAN_L	CAN related module	Because this terminal is for CAN, no valid determination of terminal voltage is possible			•  Related wiring harness
1AJ	APP sensor No.2 power supply	APP sensor	Ignition switch is turned to the ON position		Approx. 5.0	•  Related wiring harness
1AK	MAF	MAF sensor	Ignition switch is turned to the ON position		Approx. 0.7	•  MAF sensor •  Related wiring harness
			Idle		Approx. 1.4
1AL	APP sensor No.1 power supply	APP sensor	Ignition switch is turned to the ON position.		Approx. 5.0	•  Related wiring harness
1AM	CAN_H	CAN related module	Because this terminal is for CAN, no valid determination of terminal voltage is possible			•  Related wiring harness
1AN	—	—	—		—	—
1AO	APP sensor No.1	APP sensor	Ignition switch is turned to the ON position	Accelerator pedal depressed	Approx. 3.9	•  APP sensor •  Related wiring harness
				Accelerator pedal released	Approx. 1.6
1AP	APP sensor No.2	APP sensor	Ignition switch is turned to the ON position	Accelerator pedal depressed	Approx. 3.4	•  APP sensor •  Related wiring harness
				Accelerator pedal released	Approx. 1.0
1AQ*3	Cruise control switch	Cruise control switch	Ignition switch is turned to the ON position	ON OFF switch pressed in	Approx. 0	•  Cruise control switch •  Related wiring harness
				CANCEL switch pressed in	Approx. 1.1
				SET/– switch pressed in	Approx. 3.1
				RES/+ switch pressed in	Approx. 4.2
				Except above	Approx. 5.0
1AR	Sensor ground	MAF/IAT sensor	Under any condition		Below 1.0	•  Related wiring harness
1AS	APP sensor No.1 ground	APP sensor	Under any condition		Below 1.0	•  Related wiring harness
1AT	IAT	MAF/IAT sensor	Ignition switch is turned to the ON position	IAT is 20 °C {68 °F}	Approx. 2.4	•  IAT sensor •  Related wiring harness
				IAT is 60°C {140 °F}	Approx. 0.9
1AU	Refrigerant pressure switch (high, low)	Refrigerant pressure switch (high, low)	Ignition switch is turned to the ON position	A/C operating	Below 1.0	•  Refrigerant pressure switch (high, low) •  Related wiring harness
				A/C not operating	B+
1AV	APP sensor No.2 ground	APP sensor	Under any condition		Below 1.0	•  Related wiring harness
1AW	B+	Main relay	Ignition switch off		Below 1.0	•  Main relay •  Related wiring harness
			Ignition switch is turned to the ON position		B+
1AX	Drive-by-wire relay control	Drive-by-wire relay	Under any condition		Below 1.0	•  Drive-by-wire relay •  Related wiring harness
1AY	Ignition switch	Ignition switch	Ignition switch off		Below 1.0	•  Ignition switch •  Related wiring harness
			Ignition switch is turned to the ON position		B+
1AZ	Ground	Ground	Under any condition		Below 1.0	•  Related wiring harness
1BA	Back-up power supply	Battery (positive terminal)	Under any condition		B+	•  Battery •  Related wiring harness
1BB	Ground	Ground	Under any condition		Below 1.0	•  Related wiring harness
1BC	—	—	—		—	—
1BD	Ground	Ground	Under any condition		Below 1.0	•  Related wiring harness
1BE	B+	Main relay	Ignition switch off		Below 1.0	•  Main relay •  Related wiring harness
			Ignition switch is turned to the ON position		B+
1BF	Drive-by-wire relay control	Drive-by-wire relay	Ignition switch is turned to the ON position	Drive-by-wire system is malfunction	Below 1.0	•  Drive-by-wire relay •  Related wiring harness
				Drive-by-wire system is normal	B+
1BG	—	—	—		—	—
1BH	Ground	Ground	Under any condition		Below 1.0	•  Related wiring harness
2A	Throttle control (+)	Throttle body (Throttle valve actuator)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Throttle valve actuator •  Related wiring harness
2B	Throttle control (–)	Throttle body (Throttle valve actuator)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Throttle valve actuator •  Related wiring harness
2C	Purge control	Purge solenoid valve	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Purge solenoid valve •  Related wiring harness
2D	—	—	—		—	—
2E*4	OCV control	OCV	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  OCV •  Related wiring harness
2F	—	—	—		—	—
2G	EGR valve #2 coil control	EGR valve	Idle (EGR control not operating)		B+	•  EGR valve •  Related wiring harness
2H	EGR valve #4 coil control	EGR valve	Idle (EGR control not operating)		B+	•  EGR valve •  Related wiring harness
2I	Variable tumble control	Variable tumble solenoid valve	ECT 60 °C {142 °F} or more and engine speed 3,750 rpm or more		B+	•  Variable tumble solenoid valve •  Related wiring harness
			ECT less than 60 °C {142 °F} and engine speed less than 3,750 rpm		Below 1.0
2J	Variable intake air control	Variable intake air solenoid valve	Ignition switch is turned to the ON position		Below 1.0	•  Variable intake air solenoid valve •  Related wiring harness
			Engine speed: less than 4,750 rpm		Below 1.0
			Engine speed: 4,750 rpm or more		B+
2K	EGR valve #1 coil control	EGR valve	Idle (EGR control not operating)		Below 1.0	•  EGR valve •  Related wiring harness
2L	EGR valve #3 coil control	EGR valve	Idle (EGR control not operating)		B+	•  EGR valve •  Related wiring harness
2M	—	—	—		—	—
2N	—	—	—		—	—
2O	—	—	—		—	—
2P	CMP sensor ground	CMP sensor	Under any condition		Below 1.0	•  Related wiring harness
2Q	HO2S	HO2S	Idle after warm-up		Alternates between 0 and 1.0	•  HO2S •  Related wiring harness
2R	—	—	—		—	—
2S	CMP	CMP sensor	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  CMP sensor •  Related wiring harness
2T	Power steering pressure	PSP switch	Idle	Steering wheel at straight ahead position	B+	•  PSP switch •  Related wiring harness
				While turning steering wheel	Below 1.0
2U	Knocking (+)	KS	Ignition switch ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter)		Approx. 4.3	•  KS •  Related wiring harness
2V	Knocking (–)	KS	Ignition switch ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter)		Below 1.0	•  KS •  Related wiring harness
2W	CKP	CKP sensor	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  CKP sensor •  Related wiring harness
2X	Ground	Shield wire	Under any condition		Below 1.0	•  Related wiring harness
2Y	—	—	—		—	—
2Z	A/F sensor	A/F sensor	Idle after warm-up		Approx. 2.4	•  A/F sensor •  Related wiring harness
2AA	—	—	—		—	—
2AB	CKP sensor ground	CKP sensor	Under any condition		Below 1.0	•  Related wiring harness
2AC	—	—	—		—	—
2AD	A/F sensor	A/F sensor	Idle after warm-up		Approx. 2.8	•  A/F sensor •  Related wiring harness
2AE	—	—	—		—	—
2AF	—	—	—		—	—
2AG	Manifold absolute pressure	MAP sensor	Ignition switch is turned to the ON position (at sea level)		Approx. 4.1	•  MAP sensor •  Related wiring harness
			Idle		Approx. 1.2
2AH	ECT	ECT sensor	Ignition switch is turned to the ON position	ECT is 20 °C {68 °F}	Approx. 3.0	•  ECT sensor •  Related wiring harness
				ECT is 80 °C {176 °F}	Approx. 0.9
2AI	Generator field coil control	Generator (terminal D)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Generator •  Related wiring harness
2AJ	Generator output voltage	Generator (terminal P)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Generator •  Related wiring harness
2AK	Throttle valve opening angle No. 1	Throttle body (TP sensor)	Ignition switch is turned to the ON position	Accelerator pedal depressed	Approx. 4.5	•  TP sensor •  Related wiring harness
				Accelerator pedal released	Approx. 0.5
2AL	Throttle valve opening angle No. 2	Throttle body (TP sensor)	Ignition switch is turned to the ON position	Accelerator pedal depressed	Approx. 0.5	•  TP sensor •  Related wiring harness
				Accelerator pedal released	Approx. 4.5
2AM	Constant voltage	CMP sensor	Ignition switch is turned to the ON position		B+	•  Related wiring harness
2AN	—	—	—		—	—
2AO	Constant voltage (Vref)	Throttle body (TP sensor)	Ignition switch is turned to the ON position		Approx. 5.0	•  Related wiring harness
2AP	Sensor ground	Throttle body (TP sensor)	Under any condition		Below 1.0	•  Related wiring harness
2AQ	Constant voltage	CKP sensor	Ignition switch is turned to the ON position		B+	•  Related wiring harness
2AR	—	—	—		—	—
2AS	—	—	—		—	—
2AT	IGT4	Ignition coil (No.4 cylinders)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil No.4 •  Related wiring harness
2AU	Constant voltage (Vref)	MAP sensor	Ignition switch is turned to the ON position		Approx. 5.0	•  Related wiring harness
2AV	MAP sensor ground	MAP sensor	Under any condition		Below 1.0	•  Related wiring harness
2AW	IGT2	Ignition coil (No.2 cylinders)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil No.2 •  Related wiring harness
2AX	IGT3	Ignition coil (No.3 cylinders)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil No.3 •  Related wiring harness
2AY	ECT sensor ground	ECT sensor	Under any condition		Below 1.0	•  Related wiring harness
2AZ	Fuel injection (#4)	Fuel injector No.4	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Fuel injector No.4 •  Related wiring harness
2BA	IGT1	Ignition coil (No.1 cylinders)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil No.1 •  Related wiring harness
2BB	Fuel injection (#1)	Fuel injector No.1	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Fuel injector No.1 •  Related wiring harness
2BC	Fuel injection (#2)	Fuel injector No.2	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Fuel injector No.2 •  Related wiring harness
2BD	Fuel injection (#3)	Fuel injector No.3	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Fuel injector No.3 •  Related wiring harness
2BE	HO2S heater control	HO2S heater	Heavy load (Heater control not operating)		B+	•  HO2S heater •  Related wiring harness
2BF	—	—	—		—	—
2BG	A/F sensor heater control	A/F sensor heater	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  A/F sensor heater •  Related wiring harness
2BH	HO2S ground	HO2S	Under any condition		Below 1.0	•  Related wiring harness

Inspection Using An Oscilloscope (Reference)

Throttle control (+) signal

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PCM terminals

•  2A (+)—Negative battery terminal (–)

Oscilloscope setting

•  5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

•  Idle (Accelerator pedal released)

Throttle control (–) signal

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PCM terminals

•  2B (+)—Negative battery terminal (–)

Oscilloscope setting

•  5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

•  Idle (Accelerator pedal released)

Purge control signal

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PCM terminals

•  2C (+)—Negative battery terminal (–)

Oscilloscope setting

•  2 V/DIV (Y), 0.1 s/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

OCV control signal

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PCM terminals

•  2E (+)—Negative battery terminal (–)

Oscilloscope setting

•  2.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

CMP signal

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PCM terminals

•  2S (+)—Negative battery terminal (–)

Oscilloscope setting

•  2 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

CKP signal

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PCM terminals

•  2W (+)—Negative battery terminal (–)

Oscilloscope setting

•  2 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

Generator field coil control signal

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PCM terminals

•  2AI (+)—Negative battery terminal (–)

Oscilloscope setting

•  0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

Generator output voltage signal

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PCM terminals

•  2AJ (+)—Negative battery terminal (–)

Oscilloscope setting

•  2 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

Ignition timing signals

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PCM terminals

•  IGT1 (No.1): 2BA (+)—Negative battery terminal (–)

•  IGT2 (No.2): 2AW (+)—Negative battery terminal (–)

•  IGT3 (No.3): 2AX (+)—Negative battery terminal (–)

•  IGT4 (No.4): 2AT (+)—Negative battery terminal (–)

Oscilloscope setting

•  2 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

Fuel injection signals

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PCM terminals

•  Fuel Injection No.1: 2BB (+)—Negative battery terminal (–)

•  Fuel Injection No.2: 2BC (+)—Negative battery terminal (–)

•  Fuel Injection No.3: 2BD (+)—Negative battery terminal (–)

•  Fuel Injection No.4: 2AZ (+)—Negative battery terminal (–)

Oscilloscope setting

•  10 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm-up

A/F sensor heater control signal

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PCM terminals

•  2BG (+)—Negative battery terminal (–)

Oscilloscope setting

•  5 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm-up (no load)

Using the M-MDS

Note

•  PIDs for the following parts are not available on this model. Go to the appropriate part inspection page.

―  CMP sensor

―  Main relay

1.  Connect the SST (M-MDS) to the DLC-2.

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2.  Turn the ignition switch to ON position.

3.  Measure the PID value.

•  If PID value is not within the specification, follow the instructions in “Inspection item (s)” column.

Note

•  The PID/DATA MONITOR function monitors the calculated value of the input/output signals in the PCM. Therefore, an output device malfunction is not directly indicated as a malfunction of the monitored value for the output device. If a monitored value of an output device is out of specification, inspect the monitored value of the input device related to the output control.

•  For input/output signals except those of the monitoring items, use a voltmeter to measure the PCM terminal voltage.

•  The simulation items that are used in the ENGINE CONTROL SYSTEM OPERATION INSPECTION are as follows.

―  ACCS, ALTF, EVAPCP, FAN1, FAN2, FAN3, FP, FUELPW1, GENVDSD, HTR11, HTR12, IMRC, IMTV, INJ_1, INJ_2, INJ_3, INJ_4, SEGRP, test, VT DUTY1 Wt

PID/DATA monitor table (reference)