PCM INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5]

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Without Using the SST

Caution

•  The PCM terminal voltages vary with change in measuring conditions and vehicle conditions. Always carry out a total inspection of the input systems, output systems, and PCM to determine the cause of trouble. Otherwise, a wrong diagnosis will be made.

1.  Measure the voltage at each terminal.

•  If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s) referring to the Action column in the terminal voltage table.

Terminal voltage table (Reference)

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Terminal	Signal	Connected to	Test condition		Voltage (V)	inspection item
1A	Power supply	Main relay	Switch the ignition to off		Below 1.0	•  Related wiring harness
			Switch the ignition to ON		B+
1B	Power supply	Main relay	Switch the ignition to off		Below 1.0	•  Related wiring harness
			Switch the ignition to ON		B+
1C	Back-up power supply	Battery	Under any condition		B+	•  Battery •  Related wiring harness
1D	—	—	—		—	—
1E	GND	Ground	Under any condition		Below 1.0	•  Related wiring harness
1F	GND	Ground	Under any condition		Below 1.0	•  Related wiring harness
1G	GND	Ground	Under any condition		Below 1.0	•  Related wiring harness
1H	—	—	—		—	—
1I	A/C	A/C relay	A/C operating		Below 1.0	•  A/C relay •  Related wiring harness
			A/C not operating		B+
1J	—	—	—			—
1K*1	VAD control	VAD solenoid valve	Engine speed above 5,800 rpm and throttle valve opening angle above 50%		Below 1.0	•  VAD solenoid valve •  Related wiring harness
			Others		B+
1L	—	—	—			—
1M	—	—	—		—	—
1N	—	—	—		—	—
1O	—	—	—		—	—
1P	Sensor GND	MAF/IAT sensor	Under any condition		Below 1.0	•  Related wiring harness
1Q	Main relay control	Main relay	Switch the ignition to off		B+	•  Main relay •  Related wiring harness
			Switch the ignition to ON		Below 1.0
1R*2	Cooling fan control	Cooling fan relay No.2 and No.3	Cooling fan operating		Below 1.0	•  Cooling fan relay No.2 or No.3 •  Related wiring harness
			Cooling fan not operating		B+
1S	—	—	—		—	—
1T	—	—	—		—	—
1U	Cooling fan control	Cooling fan relay No.1	Cooling fan operating		Below 1.0	•  Cooling fan relay No.1 •  Related wiring harness
			Cooling fan not operating		B+
1V*3	Cooling fan control	Cooling fan relay No.2*4, No.4*5	Cooling fan operating		Below 1.0	•  Cooling fan relay No.2*4, No.4*5 •  Related wiring harness
			Cooling fan not operating		B+
1W	Constant voltage (Vref)	APP sensor	Switch the ignition to ON		Approx. 5.0	•  Related wiring harness
1X	—	—	—		—	—
1Y	—	—	—		—	—
1Z	—	—	—		—	—
1AA	—	—	—		—	—
1AB	Brake signal 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*15	Brake signal 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 (–)	CAN system related modules	Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.			•  Related wiring harness
1AJ	—	—	—		—	—
1AK	MAF	MAF sensor	Switch the ignition to ON		Approx. 0.7	•  MAF sensor •  Related wiring harness
			Idle (after warm up)		Approx. 1.2
1AL	Constant voltage (Vref)	APP sensor	Switch the ignition to ON		Approx. 5.0	•  Related wiring harness
1AM	CAN (+)	CAN system related modules	Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.			•  Related wiring harness
1AN*6	Sensor GND	Cruise control switch	Under any condition		Below 1.0	•  Related wiring harness
1AO	APP sensor No.1	APP sensor No.1	Switch the ignition to ON	Accelerator pedal released	Approx. 0.8	•  APP sensor No.1 •  Related wiring harness
				Accelerator pedal depressed	Approx. 4.0
1AP	APP sensor No.2	APP sensor No.2	Switch the ignition to ON	Accelerator pedal released	Approx. 0.4	•  APP sensor No.2 •  Related wiring harness
				Accelerator pedal depressed	Approx. 2.0
1AQ*6	Cruise control switch	Cruise control switch	Switch the ignition to ON	ON/OFF switch pressed in (OFF)	Approx. 0	•  Cruise control switch •  Related wiring harnesses
				CANCEL switch pressed in	Approx. 1.4
				SET (-) switch pressed in	Approx. 2.4
				SET (+) switch pressed in	Approx. 3.2
				RESUME switch pressed in	Approx. 3.9
				Cruise ON switch pressed in	Approx. 4.3
				Except above	Approx. 4.6
1AR	Sensor GND	MAF/IAT sensor	Under any condition		Below 1.0	•  Related wiring harness
1AS	Sensor GND	APP sensor	Under any condition		Below 1.0	•  Related wiring harness
1AT	IAT	IAT sensor	Switch the ignition to ON	IAT 20 °C {68 °F}	Approx. 2.38	•  IAT sensor •  Related wiring harness
				IAT 60 °C {140 °F}	Approx. 0.89
1AU	—	—	—		—	—
1AV	Sensor GND	APP sensor	Under any condition		Below 1.0	•  Related wiring harness
1AW	A/C	Refrigerant pressure switch (low, high), A/C switch	A/C operating		Below 1.0	•  A/C switch •  Refrigerant pressure switch (Low, high) •  Related wiring harness
			A/C not operating		B+
1AX*7	Refrigerant pressure (middle)	Refrigerant pressure switch (middle)	A/C ON	Refrigerant pressure is above 1.52 MPa {15.5 kgf/cm2, 220 psi}	Below 1.0	•  Refrigerant pressure switch (middle) •  Related wiring harness
				Refrigerant pressure is below 1.23 MPa {12.5 kgf/cm2, 178 psi}	B+
1AY	Ignition switch (IG1)	Ignition switch*8, ignition relay*9	Switch the ignition to off		Below 1.0	•  Ignition switch*8, ignition relay*9 •  Related wiring harness
			Switch the ignition to ON		B+
1AZ	—	—	—		—	—
1BA	—	—	—		—	—
1BB	Starter relay control	Starter relay	Clutch pedal is not depressed*10, Shift position is not P or N range*12		Below 1.0	•  Starter relay •  Related wiring harness
			Clutch pedal is depressed*10, Shift position is P or N range*12		4 V or more
1BC*10	Neutral position	Neutral switch	Shift lever is at neutral position		Below 1.0	•  Neutral switch •  Related wiring harness
			Shift lever is not at neutral position		B+
1BD*10	Clutch operation	CPP switch	Clutch pedal depressed		Below 1.0	•  CPP switch •  Related wiring harness
			Clutch pedal released		B+
1BE	GND	Ground	Under any condition		Below 1.0	•  Related wiring harness
1BF	—	—	—		—	—
1BG	Fuel pump control	Fuel pump relay	Switch the ignition to ON		B+	•  Fuel pump relay •  Related wiring harness
			Cranking		Below 1.0
			Idle		Below 1.0
1BH	—	—	—		—	—
2A	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
2B	HO2S heater control	HO2S heater	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  HO2S heater •  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*11	OCV control	OCV	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  OCV •  Related wiring harness
2F	—	—	—		—	—
2G	IGT1	Ignition coil No.1	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil No.1 •  Related wiring harness
2H	IGT4	Ignition coil No.4	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil No.4 •  Related wiring harness
2I	Variable tumble control	Variable tumble solenoid valve	ECT above 63 °C {145 °F} while idling.		B+	•  Variable tumble solenoid valve •  Related wiring harness
			ECT below 63 °C {145 °F} and engine speed below 3,750 rpm		Below 1.0
2J*11	Variable intake air control	Variable intake air solenoid valve	Engine speed: above 4,600(MZR 2.0)/4,400(MZR 2.5) rpm		B+	•  Variable intake air solenoid valve •  Related wiring harness
			Engine speed: below 4,600(MZR 2.0)/4,400(MZR 2.5) rpm		Below 1.0
2K	IGT2	Ignition coil No.2	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil No.2 •  Related wiring harness
2L	IGT3	Ignition coil No.3	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Ignition coil No.3 •  Related wiring harness
2M	—	—	—		—	—
2N	—	—	—		—	—
2O	Sensor GND	A/F sensor*1, HO2S*13	Under any condition		Below 1.0	•  Related wiring harness
2P	—	—	—		—	—
2Q	HO2S	HO2S	Idle (after warm up)		Alternates between 0 and 1.0	•  HO2S •  Related wiring harness
2R	—	—	—		—	—
2S	CMP signal	CMP sensor	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  CMP sensor •  Related wiring harness
2T	—	—	—		—	—
2U	Knocking (+)	KS	Switch the ignition to ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter)		Approx. 4.0	•  KS •  Related wiring harness
2V	Knocking (–)	KS	Switch the ignition to 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 signal	CKP sensor	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  CKP sensor •  Related wiring harness
2X	GND	Sensor shield	Under any condition		Below 1.0	•  Related wiring harness
2Y*1	A/F sensor	A/F sensor	Switch the ignition to ON		Approx. 2.8	•  A/F sensor •  Related wiring harness
2Z	A/F sensor	A/F sensor	Idle (after warm up)		Approx. 5.10	•  A/F sensor •  Related wiring harness
2AA	Generator field coil control	Generator (terminal D)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Generator •  Related wiring harness
2AB	—	—	—		—	—
2AC	A/F sensor	A/F sensor	Idle (after warm up): Approx. 0 mA			•  A/F sensor •  Related wiring harness
2AD	A/F sensor	A/F sensor	•  Verify that the voltage increases when the engine speed increases.			•  A/F sensor •  Related wiring harness
2AE	—	—	—		—	—
2AF	Generator output voltage	Generator (terminal P)	•  Inspect using the wave profile. (See Inspection Using An Oscilloscope (Reference).)			•  Generator •  Related wiring harness
2AG	MAP	MAP sensor	Switch the ignition to ON		Approx. 4.1	•  MAP sensor •  Related wiring harness
			Idle (after warm up)		Approx. 1.2
2AH	ECT	ECT sensor	Switch the ignition to ON	ECT 20 °C {68 °F}	3.04—3.14	•  ECT sensor •  Related wiring harness
				ECT 80 °C {176 °F}	0.76—0.83
2AI	—	—	—		—	—
2AJ	—	—	—		—	—
2AK	TP (No. 1)	TP sensor No. 1	Switch the ignition to ON	Accelerator pedal released	Approx. 0.6	•  TP sensor No.1 •  Related wiring harness
				Accelerator pedal depressed	Approx. 4.2
2AL	TP (No. 2)	TP sensor No. 2	Switch the ignition to ON	Accelerator pedal released	Approx. 4.4	•  TP sensor No.2 •  Related wiring harness
				Accelerator pedal depressed	Approx. 0.8
2AM	CMP power	CMP sensor	Switch the ignition to ON		B+	•  Related wiring harness
2AN	—	—	—		—	—
2AO	Constant voltage (Vref)	TP sensor	Switch the ignition to ON		Approx. 5.0	•  Related wiring harness
2AP	Sensor GND	TP sensor	Under any condition		Below 1.0	•  Related wiring harness
2AQ	CKP power	CKP sensor	Switch the ignition to ON		B+	•  Related wiring harness
2AR	—	—	—		—	—
2AS*14	Sensor GND	HO2S	Under any condition		Below 1.0	•  Related wiring harness
2AT	EGR valve control	EGR valve	EGR valve operating		0 or B+	•  EGR valve •  Related wiring harness
2AU	Constant voltage (Vref)	MAP sensor	Switch the ignition to ON		Approx. 5.0	•  Related wiring harness
2AV	—	—	—		—	—
2AW	EGR valve control	EGR valve	EGR valve operating		0 or B+	•  EGR valve •  Related wiring harness
2AX	EGR valve control	EGR valve	EGR valve operating		0 or B+	•  EGR valve •  Related wiring harness
2AY	Sensor GND	ECT sensor, MAP 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	EGR valve control	EGR valve	EGR valve operating		0 or B+	•  EGR valve •  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	Throttle valve actuator control (+)	Throttle valve actuator	Switch the ignition to ON		B+	•  Throttle valve actuator •  Related wiring harness
2BF	Throttle valve actuator control (–)	Throttle valve actuator	Idle (after warm up)		3.5—5.5	•  Throttle valve actuator •  Related wiring harness
2BG*11	OCV	OCV	Switch the ignition to ON		B+	•  OCV •  Related wiring harness
2BH	—	—	—		—	—

Inspection Using An Oscilloscope (Reference)

Purge control signal

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PCM terminals

•  2C(+)—body ground(–)

Oscilloscope setting

•  10 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm up

OCV control signal

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PCM terminals

•  2E(+)—body ground(–)

Oscilloscope setting

•  2 V/DIV (Y), 0.8 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm up

CMP sensor signal

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PCM terminals

•  2S(+)—body ground(–)

Oscilloscope setting

•  1 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm up

CKP sensor signal

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PCM terminals

•  2W(+)—body ground(–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm up

Generator field coil control signal

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PCM terminals

•  2AA(+)—body ground(–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm up

Generator output voltage signal

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PCM terminals

•  2AF(+)—body ground(–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm up

IGT1, IGT2, IGT3, IGT4 control signals

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PCM terminals

•  IGT1(ignition coil No.1): 2G(+)—body ground(–)

•  IGT2(ignition coil No.2): 2K(+)—body ground(–)

•  IGT3(ignition coil No.3): 2L(+)—body ground(–)

•  IGT4(ignition coil No.4): 2H(+)—body ground(–)

Oscilloscope setting

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

Vehicle condition

•  Idle after warm up

Fuel injection control

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PCM terminals

•  Fuel Injection No.1: 2BB(+)—body ground(–)

•  Fuel Injection No.2: 2BC(+)—body ground(–)

•  Fuel Injection No.3: 2BD(+)—body ground(–)

•  Fuel Injection No.4: 2AZ(+)—body ground(–)

Oscilloscope setting

•  10 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm up

HO2S heater control

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PCM terminals

•  2B(+)—body ground(–)

Oscilloscope setting

•  5 V/DIV (Y), 1 s/DIV (X), DC range

Vehicle condition

•  Idle (immediately after starting the engine)

A/F sensor heater control

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PCM terminals

•  2A(+)—body ground(–)

Oscilloscope setting

•  5 V/DIV (Y), 200 ms/DIV (X), DC range

Vehicle condition

•  Idle (immediately after starting the engine)

Using M-MDS

1.  Connect the M-MDS to the DLC-2.

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2.  Switch the ignition to ON.

3.  Measure the PID value.

•  If PID value is not within the specification, follow the instructions in Action 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, ARPMDES, EVAPCP, FAN1, FAN2, FAN3, FP, IASV, IMRC, IMTV, INJ1~4, SEGRP, Test, VT DUTY1 wt

PID/DATA monitor table (reference)