PCM INSPECTION [L3]

Note

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

- CMP sensor (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [L3].)

- Main relay (See RELAY INSPECTION.)

1. Connect the WDS or equivalent to the DLC-2.

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 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

- FAN DUTY

- FP

- FUELPW1

- GENVDSD

- HTR11

- HTR12

- IAC

- IMRC

- IMTV

- INJ_1, INJ_2, INJ_3, INJ_4

- SEGRP

- TEST

PID/DATA monitor table (reference)

Monitor item (Definition)	Unit/Condition		Condition/Specification (Reference)	Action	PCM terminal
ACCS (A/C relay)	On/Off		Ignition switch ON: Off A/C switch ON and fan switch ON at idle: On	Inspect following PIDs: RPM, TP, ECT, AC_REQ, TR. Inspect A/C relay.	4O
AC_REQ (A/C switch)	On/Off		A/C switch and fan switch ON at ignition switch ON: Off A/C switch OFF at ignition switch ON: Off	Inspect A/C switch.	1AC
ALTF (Generator field coil control duty value)	%		Ignition switch ON: 0% Idle: 0-100% Just after A/C switch ON and fan switch ON at idle: Duty value rises	Inspect following PIDs: IAT, ECT, RPM, VPWR, ALTT V. Inspect generator. (See GENERATOR INSPECTION [L3].)	1AD
ALTT V (Generator output voltage)	V		Ignition switch ON: 0 V Idle: Approx. 14.9 V*1 (E/L not operating)	Inspect generator. (See GENERATOR INSPECTION [L3].)	1AA
ARPMDES (Target engine speed)	RPM		No load: 650 rpm E/L operating: 650 rpm P/S operating: 700 rpm A/C ON: 700 rpm	Inspect following PIDs: IAT, RPM, MAP, ECT, MAF, TP, INGEAR, AC_REQ, TR, PSP, ALTT V. Inspect IAC valve. (See IDLE AIR CONTROL (IAC) VALVE INSPECTION [L3].) Inspect CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [L3].)	-
AST (After start timer)	Time		-	-	-
BARO (Barometric pressure)	Pressure		Ignition switch ON (at sea level): approx. 101 kPa	Inspect BARO sensor. (See BAROMETRIC PRESSURE (BARO) SENSOR INSPECTION [L3].)	1G
	V		Ignition switch ON (at sea level): approx. 4.1 V
BOO (Brake switch)	On/Off		Brake pedal depressed: On Brake pedal released: Off	Inspect brake switch.	1K
CHRGLMP (Generator warning light)	On/Off		Ignition switch ON: On Idle: Off	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	4C
COLP (Refrigerant pressure switch (middle))*6	On/Off		Refrigerant pressure switch (middle) ON *2 at idle: On Refrigerant pressure switch (middle) OFF*3 at idle: Off	Inspect refrigerant pressure switch. (See REFRIGERANT PRESSURE SWITCH INSPECTION.)	1Q
CPP (Clutch pedal position)	On/Off		Clutch pedal depressed: On Clutch pedal released: Off	Inspect CPP switch. (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [L3 MTX].)	1R*6
CPP/PNP (Shift lever position)	On/Off		Neutral position: On Others: Off	Inspect neutral switch. (See NEUTRAL SWITCH INSPECTION [L3 MTX].)	1W*6
DTCCNT (Number of DTC detected)	-		-	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	-
ECT (Engine coolant temperature)	°C	°F	ECT 20 °C {68 °F}: 20 °C {68 °F} ECT 60 °C {140 °F}: 60 °C {140 °F}	Inspect ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L3].)	1M
	V		ECT 20 °C {68 °F}: 3.04-3.14 V ECT 60 °C {140 °F}: 1.29-1.39 V
EVAPCP (Purge solenoid valve duty value)	%		Ignition switch ON: 0% Idle: 0%	Inspect following PIDs: IAT, RPM, ECT, MAF, O2S11,BARO, INGEAR, TR, VPWR. (See PURGE SOLENOID VALVE INSPECTION [L3].)	4U
FAN DUTY (Fan control duty)	%		ECT below 98 °C {208 °F}: 0% A/C operating and refrigerant pressure switch (middle) ON: 100%	Inspect following PIDs: RPM, TP, ECT, AC_REQ, COLP, TEST. Inspect fan control module. (See FAN CONTROL MODULE INSPECTION.)	1U
FDPDTC (Pending code caused FFD storage)	-		-	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	-
FP (Fuel pump relay)	On/Off		Ignition switch ON: Off Idle: ON Cranking: On	Inspect following PIDs: RPM. Inspect fuel pump relay. (See RELAY INSPECTION.)	4P*5
					4Q*4
FUELPW (Fuel injector duration)	Time		Ignition switch ON: 0 ms Idle (after warm up): approx. 2.5 ms	Inspect following PIDs: IAT, MAF, TP, MAP, ECT, RPM, O2S11, O2S12, INGEAR, TR, PSP, AC_REQ, VPWR, ALTT V. Inspect fuel injector. (See RELAY INSPECTION.)	4W, 4Z, 4AA, 4AD
FUELSYS (Fuel system status)	Open loop/Closed loop		Ignition switch ON: Open loop Idle (after warm up): Open loop	Inspect following PIDs: IAT, MAF, TP, MAP, ECT, RPM, O2S11, O2S12, INGEAR, TR, PSP, AC_REQ, VPWR, ALTT V. Inspect fuel injector. (See RELAY INSPECTION.)	-
GENVDSD (Generator voltage desired)	V		Ignition switch ON: 0 V Idle: Approx. 14.9 V*1 (E/L not operating)	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	-
HTR11 (HO2S heater (front))	On/Off		Idle (after warm up): On⇔Off	Inspect following PIDs: IAT, MAF, TP, ECT, RPM, AC_REQ. (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [L3].)	4A
HTR12 (HO2S heater (rear))	On/Off		Ignition switch ON: Off (HO2S heater operated) Idle: On (HO2S heater operated)	Inspect following PIDs: IAT, MAF, ECT, RPM, AC_REQ. (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [L3].)	4D
IAC (IAC valve)	%		Ignition switch ON: 0% Idle: Approx. 60% (ECT 90°C {194 °F} and E/L not operating)	Inspect following PIDs: IAT, RPM, MAP, ECT, MAF, TP, INGEAR, TR, PSP, AC_REQ. Inspect IAC valve. (See IDLE AIR CONTROL (IAC) VALVE INSPECTION [L3].)	4G 4J
IAT (Intake air temperature)	°C	°F	IAT 20 °C {68 °F}: 20 °C {68 °F} IAT 30 °C {86 °F}: 30 °C {86 °F}	Inspect IAT sensor. (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [L3].)	2E
	V		IAT 20 °C {68 °F}: 2.4-2.6 V IAT 30 °C {86 °F}: 1.7-1.9 V
IMTV (VIS control solenoid valve)	On/Off		Engine speed is below approx. 4,500 rpm: On Others: Off	Inspect following PIDs: RPM. Inspect VIS control solenoid valve. (See VARIABLE INTAKE-AIR SYSTEM (VIS) CONTROL SOLENOID VALVE INSPECTION [L3].)	4R
IMRC (Variable tumble control solenoid valve)	On/Off		Engine speed is below 3,500 rpm and ECT is below 60 °C {140 °F}: On Others: Off	Inspect following PIDs: RPM. Inspect variable tumble control solenoid valve. (See VARIABLE TUMBLE CONTROL SOLENOID VALVE INSPECTION [L3].)	4T
INGEAR (Load/no load condition)	On/Off		CPP or CPP/PNP is ON: Off Others: On	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	1R*6, 1W*6
IVS (CTP condition)	On/off		CTP: On Others: Off	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	2A
KNOCKR (Knocking retard)	Angle		Ignition switch ON: 0 degree Idle: 0 degree	Inspect knock sensor. (See KNOCK SENSOR INSPECTION [L3].)	2P, 2S
LOAD (Engine load)	%		Ignition switch ON: 0% Idle (after warm up): approx.19%	Inspect MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [L3].)	-
LONGFT1 (long term fuel trim)	%		Idle (after warm up): approx.-14-14%	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	-
MAF (Mass airflow)	g/s		Ignition switch ON: approx. 0 g/s Idle (after warm up): 1.5 g/s	Inspect MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [L3].)	1P
	V		Ignition switch ON: approx. 0.7 V Idle (after warm up): 1.3 V
MAP (Manifold absolute pressure)	Pressure		Ignition switch ON (at sea level): approx. 101 kPa {760 mmHg, 14.7 psi}	Inspect MAP sensor. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [L3].)	1J
	V		Ignition switch ON (at sea level): approx. 4.1 V
MIL (Malfunction indicator lamp)	On/Off		Ignition switch ON: On Idle: Off	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	4I
MIL_DIS (Travelled distance since the MIL illuminated)	Distance		No DTC: 0 km {0 mph} DTC detected: Not 0 km {0 mph}	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	-
O2S11 (Front oxygen sensor)	V		Ignition switch ON: 0-1.0 V Idle (After warm up): 0-1.0 V Acceleration (After warm up): 0.5-1.0 V Deceleration (After warm up): 0-0.5 V	Inspect HO2S (front). (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [L3].)	1AB
O2S12 (Rear oxygen sensor)	V		Idle (After warm up): approx. 0.6 V	Inspect HO2S (rear). (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [L3].)	1Y
PSP (Power steering pressure switch)	On/Off		Steering wheel in straight ahead position: Off Others: On	Inspect PSP switch. (See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION [L3].)	1Z
RFCFLAG (Readiness function code)	On/Off		Before running PCM adaptive memory procedure drive mode: On After running PCM adaptive memory procedure drive mode: Off	Run PCM adaptive memory procedure drive mode. (See OBD DRIVE MODE [L3].)	-
RO2FT1 (Rear oxygen sensor fuel trim)	%		Idle (after warm up): approx.-3-3%	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	-
RPM (Engine speed)	RPM		No load: 600-700 rpm E/L operating: 600-700 rpm P/S operating: 650-750 rpm A/C ON: 650-750rpm	Inspect CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [L3].)	2D, 2G
SEGRP (EGR valve (stepping motor) position)	STEP		Ignition switch ON: 0 step Idle: 0 step Cranking: 0-60 steps	Inspect following PIDs: MAF, TP, ECT, RPM, VSS. Inspect EGR valve. (See EGR VALVE INSPECTION [L3].)	4E 4H 4K 4N
SHRTFT1 (Short term fuel trim)	%		Idle (after warm up): approx.-30-25%	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	-
SPARKADV (Ignition timing)	BTDC		Ignition switch ON: BTDC 0 degree Idle: BTDC approx. 10 degree	Inspect following PIDs: MAF, TP, ECT, RPM, INGEAR, TR, PSP, AC_REQ, VPWR. Inspect ignition timing. (See IGNITION TIMING INSPECTION [L3].)	2J 2M
TEST (TEN terminal (DLC))	On/Off		Terminal TEN (DLC) shorted to GND: On Terminal TEN (DLC) open: Off	Inspect wiring from DLC terminal TEN to PCM terminal 1I	1I*6, 1L*7
TP (TP)	%		CTP: 13-23% WOT: 86-96%	Inspect TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L3].)	2A
	V		CTP: 0.65-1.15 V WOT: 4.3-4.8 V
TPCT (TP sensor voltage at CTP)	V		0.65-1.15 V	Inspect TP sensor. (See THROTTLE POSITION (TP) SENSOR INSPECTION [L3].)	2A
VPWR (Battery positive voltage)	V		Ignition switch ON: B+	Inspect main relay. (See RELAY INSPECTION.) Inspect battery. (See BATTERY INSPECTION.)	2Y, 2Z
VSS (Vehicle speed)	KPH	MPH	Vehicle speed 20 km/h {12 mph}: 20 KPH {12 MPH} Vehicle speed 40 km/h {25 mph}: 20 KPH {12 MPH}	Perform applicable DTC troubleshooting. (See DTC TABLE [L3].)	2L

*¹ :

Calculated value; differs from terminal voltage

*² :

Refrigerant pressure switch (middle) turns on when the refrigerant pressure is 1.69-1.84 MPa {17.3-18.7 kgf/cm2, 247-265 psi}

*³ :

Refrigerant pressure switch (middle) turns off when the refrigerant pressure is 1.26-1.49 MPa {12.9-15.1 kgf/cm2, 184-214 psi}

*⁴ :

Immobilizer system equipped

*⁵ :

Immobilizer system not equipped

*⁶ :

MTX models

*⁷ :

ATX models

Without Using the WDS or Equivalent

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)

*¹ :

MTX models

*² :

ATX models

*³ :

Immobilizer system equipped

*⁴ :

Immobilizer system not equipped

*⁵ :

European (L.H.D. U.K.) specs.

*⁶ :

Except European (L.H.D. U.K.) specs.

Inspection Using An Oscilloscope (Reference)

IGT1, IGT2 control signals

• IGT1(No.1 and No.4): 1A(+)-1D(-)

• IGT2(No.2 and No.3): 1B(+)-1C(-)

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

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

ECT (Engine Coolant Temperature) output signals

• 2B*¹ (+)-1C (-)

• 1I*² (+)-1C (-)

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

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

Cooling Fan Control signals

• 1U*¹ (+)-1C (-)

• 2T*² (+)-1C (-)

• 2 V/DIV (Y), 0.2 ms/DIV (X), DC range

• Idle after warm up (A/C ON)

Generator output voltage signal

• 1AA(+)-2AC(-)

• 2 V/DIV (Y), 2 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

HO2S (front) signal

• 1AB(+)-2H(-)

• 0.1 V/DIV (Y), 400 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

Generator field coil control signal

• 1AD(+)-1C(-)

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

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

CKP sensor signal

(+)

• 2D(+)-2H(-)

• 2 V/DIV (Y), 4 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

(-)

• 2G(+)-2H(-)

• 2 V/DIV (Y), 4 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

VSS signal

• 2L*¹ (+)-1C (-)

• 3C*² (+)-1C (-)

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

• Drive the vehicle with approx. 60 km/h {37.3 mph}

CMP sensor signal

(+)

• 2J(+)-2H(-)

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

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

(-)

• 2M(+)-2H(-)

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

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

Input/turbine speed sensor signal

• 3G*² (+)-3J*² (-)

• 1 V/DIV (Y), 2 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C off)

Pressure control solenoid signal

(-)

• 3V(+)-1C(-)

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

(+)

• 3Y(+)-1C(-)

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

HO2S (front) heater control signal

• 4A(+)-1C(-)

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

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

IAC signal

(+)

• 4G(+)-1C(-)

• 2 V/DIV (Y), 0.4 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

(-)

• 4J(+)-1C(-)

• 2 V/DIV (Y), 0.4 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

Purge control signal

• 4U(+)-1C(-)

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

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

Fuel injection control

• Fuel Injection No.1: 4Z(+)-1C(-)

• Fuel Injection No.1: 4W(+)-1C(-)

• Fuel Injection No.1: 4AD(+)-1C(-)

• Fuel Injection No.1: 4AA(+)-1C(-)

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

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

Shift solenoid C control

• 4Y*² (+)-1C(-)

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

Shift solenoid A control

• 4AB*² (+)-1C(-)

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)

Shift solenoid B control

• 4AC*² (+)-1C(-)

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

• Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)