PCM INSPECTION

Not Using the WDS or Equivalent

Note

• The PCM terminal voltage can vary with conditions when measuring and changes due to age deterioration on the vehicle, causing false diagnosis. Therefore a comprehensive inspection of the input and output systems, and the PCM is necessary to determine where the malfunction occurs.

PCM terminal voltage table (Reference)

Inspection Using An Oscilloscope (Reference)

Note

• The duty ratio for the wave pattern can vary with the control conditions. Therefore determine comprehensively where the malfunction occurs among the input systems, output systems, and the PCM.

Throttle control (+)

• Terminal connected: 1B (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 0.4 ms/DIV (X), DC range

• Measurement condition: Ignition switch at ON

Throttle control (-)

• Terminal connected1C (+)-Negative battery terminal

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

• Measurement condition: As soon as the accelerator pedal is fully released from the fully depressed position while the ignition switch is at ON (engine off).

Front HO2S heater control

• Terminal connected:1V (+)-Negative battery terminal

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

• Measurement condition: Idling after warm-up (no load)

Fuel injector (FS, RS) control

• Terminal connected:

FS: 2G (+)-Negative battery terminal

RS: 2D (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 5 ms/DIV (X), DC range

• Measurement condition: Racing after warm-up (no load)

Field coil control (Generator)

• Terminal connected: 2I (+)-Negative battery terminal

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

• Measurement condition: Idling after warm-up (no load)

Fuel injector (FP1, RP1) control

• Terminal connected:

FP1: 2M (+)-Negative battery terminal

RP1: 2J (+)-Negative battery terminal

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

• Measurement condition: Idling after warm-up (no load)

• Terminal connected:

FP1: 2M (+)-Negative battery terminal

RP1: 2J (+)-Negative battery terminal

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

• Measurement condition: Cranking while the engine is cold. (ECT: Approx. 20 °C {68 °F})

Purge control

• Terminal connected:2P (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 20 ms/DIV (X), DC range

• Measurement condition: Idling after warm-up (no load)

Note

• Purge control might not be activated depending on the engine conditions.

Generator output voltage

• Terminal connected: 2T (+)-Negative battery terminal

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

• Measurement condition: Idling after warm-up (no load)

Eccentric shaft position sensor

• Terminal connected: 2U (+)-Negative battery terminal

• Oscilloscope setting: 2 V/DIV (Y): 5 ms/DIV (X), DC range

• Measurement condition: Idling after warm-up (no load)

Metering oil pump control 1

• Terminal connected: 2W (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 2 ms/DIV (X), DC range

• Measurement condition: Just after the ignition switch is off after warm-up (no load)

Metering oil pump control 2

• Terminal connected: 2AB (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 2 ms/DIV (X), DC range

• Measurement condition: Just after the ignition switch is off after warm-up (no load)

Metering oil pump control 3

• Terminal connected: 2V (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 2 ms/DIV (X), DC range

• Measurement condition: Just after the ignition switch is off after warm-up (no load)

Metering oil pump control 4

• Terminal connected: 2Y (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 2 ms/DIV (X), DC range

• Measurement condition: Just after the ignition switch is off after warm-up (no load)

Ignition coil (L/F, L/R, T/F, T/R)

• Terminal connected:

L/F: 2AA (+)-Negative battery terminal

L/R: 2Z (+)-Negative battery terminal

T/F: 2AD (+)-Negative battery terminal

T/R: 2AC (+)-Negative battery terminal

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

• Measurement condition: Idling after warm-up (no load)

Fuel injector (FP2, RF2) control

• Terminal connected:

FP2: 3A (+)-Negative battery terminal

RP2: 3D (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 5 ms/DIV (X), DC range

• Measurement condition: Racing after warm-up (no load)

APV motor control (+)

• Terminal connected: 3G (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 20 ms/DIV (X), DC range

• Measurement condition: Engine speed 6,250 rpm or more after warm-up (Approx. 2 s after the APV remains open)

APV motor control (-)

• Terminal connected: 3J (+)-Negative battery terminal

• Oscilloscope setting: 5 V/DIV (Y): 20 ms/DIV (X), DC range

• Measurement condition: Within 20 s from 2 s after the accelerator is released from the engine speed at 6,250 rpm or more after warm-up.

Using the WDS or Equivalent

Note

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

– 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, AIP RLY, ALTF, APV, ARPMDES, DEI, ETC_DSD, EVAPCP, FAN1, FAN2, FP, FPRR, FUELPW, GENVDSD, HTR11, HTR12, IASV, MOP POS, PACNTV, PREDELI, SSV, test

PID/DATA monitor table (reference)

Monitor item (Definition)	Unit/Condition		Condition/Specification (Reference)	Inspection item(s)	PCM terminal
ACCS (A/C relay)	On/Off		• Ignition switch ON: Off • A/C switch ON and fan switch ON at idling: On	• The following PIDs – ACSW, ECT, IVS, PCM_T, RPM, TP, VSS • A/C relay	5AA
ACSW (A/C switch)	On/Off		• A/C switch and fan switch ON at ignition switch ON: On • A/C switch OFF at ignition switch ON: Off	• A/C switch	4W
AIP RLY (AIR pump relay)	On/Off		• During the specified period after cold: On • Idling after warm-up: Off	• The following PIDs – CATT11_DSD, ECT, IAT • AIR pump relay	4O
ALTF (Generator field coil control duty value)	%		• Ignition switch ON: 0% • Just after A/C switch ON and fan switch ON at idling: Duty value rises	• The following PIDs – ALTT V, B+, ECT, IAT, IVS, PCM_T, RPM, VSS	2I
ALTT V (Generator output voltage)	V		• Ignition switch ON: 0 V • Idling: Approx. 14.9 V*1 (E/L not operating)	Generator.	2T
APP (Accelerator pedal position)	%		• Accelerator pedal released: 0% • Accelerator pedal depressed: 100%	• The following PIDs – APP1, APP2 • APP sensor	-
APP1 (Accelerator pedal position)	%		• Accelerator pedal released: 31.1-33.1% • Accelerator pedal depressed: 75.6-78.6%	APP sensor	5F
	V		• Accelerator pedal released: 1.555-1.655 V • Accelerator pedal depressed: 3.78-3.93 V
APP2 (Accelerator pedal position)	%		• Accelerator pedal released: 20.1-22.1% • Accelerator pedal depressed: 64.6-67.6%	APP sensor	5C
	V		• Accelerator pedal released: 1.005-1.105 V • Accelerator pedal depressed: 3.23-3.38 V
APV (APV motor)	Opening/Closing		• High engine speed after warm-up: Opening • Except above: Closing	• The following PIDs – APV_POS, BARO, ECT, IAT, MAF, RPM, TP • APV motor	3G, 3J
APV_POS (APV position sensor)	V		• High engine speed after warm-up: 1.5 V or less • Except above: 1.5 V or more	• APV position sensor	3B
ARPMDES (Target engine speed)	RPM		MT • No load after warm-up: 750-850 rpm AT • No load after warm-up: 760-860 rpm	• The following PIDs – ACCS, ALTT V, B+, COLP, ECT, IAT, MAF, RPM, TP	-
B+ (Battery positive voltage)	V		• Ignition switch ON: B+	• Battery	5J
BARO (Barometric pressure)	kPa, Bar, psi		• Ignition switch ON: Indicate the atmospheric pressure	• BARO sensor	5S
	V		• Ignition switch ON – Altitude 0 m {0 ft}: 3.8-4.2 V*4 – Altitude 305 m {1,000 ft}: 3.6-4.0 V*4 – Altitude 610 m {2,000 ft}: 3.5-3.9 V*4 – Altitude 914 m {3,000 ft}: 3.4-3.7 V*4 – Altitude 1,219 m {4,000 ft}: 3.2-3.6 V*4 – Altitude 1,524 m {5,000 ft}: 3.1-3.5 V*4 – Altitude 1,829 m {6,000 ft}: 3.0-3.4 V*4 – Altitude 2,134 m {7,000 ft}: 2.9-3.3 V*4
BOO (Brake switch)	On/Off		• Brake pedal depressed: On • Brake pedal released: Off	• Brake switch	4P
CATT11_DSD (Estimated catalytic converter temperature)	°C	°F	• Idling after warm-up: Approx. 531 °C {988 °F}	• The following PIDs – ECT, IAT, LOAD, RPM	-
CHRGLP (Generator warning light)	On/Off		• Ignition switch ON: On • Idling: Off	• Generator warning light	-
COLP (Refrigerant pressure switch (middle))	On/Off		• Refrigerant pressure switch (middle) ON *2 at idling: On • Refrigerant pressure switch (middle) OFF*3 at idling: Off	• Refrigerant pressure switch	4Z
CPP (Clutch pedal position)	On/Off		• Clutch pedal depressed: On • Clutch pedal released: Off	• CPP switch	4F
CPP/PNP (Shift lever position)	Drive/Neutral		• Neutral position: Neutral • Except above: Drive	• Neutral switch	2O
DEI (VDI solenoid valve)	On/Off		• Idling: Off • High engine speed after warm-up: On	• The following PID – RPM • VDI solenoid valve	1W
DTC_CNT (Number of DTC detected)	-		-	-	-
ECT (Engine coolant temperature)	°C	°F	• Ignition switch at ON position: Indicate the ECT	• ECT sensor	2K
	V		• ECT 20 °C {68 °F}: Approx. 3.1 V • ECT 80 °C {176 °F}: Approx. 0.9 V
ECT_DES (Estimated ECT)	°C	°F	• Ignition switch at ON position: Indicate the estimated ECT	• The following PIDs – ECT, IAT, LOAD, MAF, VSS	-
EQ_RAT11 (Front HO2S)	-		• Idling after worm-up: Approx.1	• Front HO2S	2B, 2C
ETC_ACT (Electronic throttle control actual)	°		• CTP: Approx. 6.3° • WOT: Approx. 83°	• The following PIDs – TP1, TP2	-
ETC_DSD (Electronic throttle control desired)	°		• CTP: Approx. 6.3° • WOT: Approx. 83°	• The following PIDs – APP, ECT_DES	-
	%		• CTP: Approx. 7% • WOT: Approx. 100%
EVAPCP (Purge solenoid valve duty value)	%		• Ignition switch ON: 0% • Increase the engine speed: Duty value rises	• The following PIDs – BARO, ECT, FUELSYS, IAT, LOAD, MAF, RPM • Purge solenoid valve	2P
FAN1 (Cooling fan control)	On/Off		• The cooling fan is operating: On • Except above: Off	• The following PIDs – ACSW, COLP, ECT, IAT, PCM_T • Cooling fan relay No.1	5X
FAN2 (Cooling fan control)	On/Off		• The cooling fan is operating at high speed: On • Except above: Off	• The following PIDs – ACSW, COLP, ECT, IAT, PCM_T • Cooling fan relay No.2	5AD
FDPDTC (Pending code caused FFD storage)	-		-	-	-
FP (Fuel pump relay)	On/Off		• Ignition switch ON: Off • Idling: On • Cranking: On	• The following PID – RPM • Fuel pump relay	5P*5 5L*6
FPRR (Fuel pump speed control relay)	On/Off		• Ignition switch ON: Off • Idling: Off • Cranking: On	• The following PIDs – B+, BARO, ECT, IAT, MAF, O2S11, O2S12, RPM, TP • Fuel pump speed control relay	4M
FUELPW (Fuel injector duration)	ms		• Cranking (before warm-up [ECT: 20 °C {68 °F}]): Approx. 48 ms • Cranking after warm-up: Approx. 9.6 ms • Idling after warm-up: 2.9-3.5 ms	• The following PIDs – ACSW, APP, B+, BARO, ECT, IAT, KNOCKR, MAF, O2S11, O2S12, RPM, TP, VSS • Fuel injector	2J, 2M
FUELSYS (Fuel system status)	OL/CL/ OL Drive/ OL Fault/ CL Fault		• Idling after warm-up: CL	• The following PIDs – ACSW, APP, B+, BARO, ECT, IAT, KNOCKR, MAF, O2S11, O2S12, RPM, TP, VSS	-
GENVDSD (Generator voltage desired)	V		• Ignition switch ON: 0 V • Idling: Approx. 14.9 V*1 (E/L not operating)	• The following PIDs – ACSW, ALTT V, B+, BOO, ECT, IAT, PCM_T, RPM, VSS	-
HTR11 (Front HO2S heater)	On/Off		• Idling after warm-up: On	• The following PIDs – B+, ECT, IAT, LOAD, MAF • Front HO2S heater	1V
HTR12 (Rear HO2S heater)	On/Off		• Idling after warm-up: On	• The following PIDs – B+, ECT, IAT, LOAD, MAF • Rear HO2S heater	2A
IAC (Idle air control)	%		• Ignition switch ON: Approx. 26% • Idling after warm-up: Approx. 21%	• The following PIDs – ACSW, ALTT V, APP, ARPMDES, COLP, ECT, EVAPCP, RPM, VSS • Throttle valve actuator	1B, 1C
IASV (VFAD solenoid valve)	On/Off		• High engine speed: On • Idling: Off	• The following PID – RPM • VFAD solenoid valve	5Z
IAT (Intake air temperature)	°C	°F	• Ignition switch at ON position: Indicate the IAT	• IAT sensor	5K
	V		• IAT 20 °C {68 °F}: Approx. 2.4 V • IAT 40 °C {104 °F}: Approx. 1.5 V
INGEAR (In gear)	On/Off		MT • When the following conditions are satisfied: On – Engine runs – Not neutral – Clutch pedal released • Except above: Off AT • When the following conditions are satisfied: On – Engine runs – Driving range • Except above: Off	• The following PIDs – CPP, CPP/PNP, RPM	-
IVS (CTP condition)	Idle/ Off Idle		• CTP: Idle • Except above: Off idle	• The following PID – APP	-
KNOCKR (Knocking retard)	°		• Ignition switch ON: 0 ° • Idling: 0 °	• KS	1T
LOAD (Engine load)	%		MT • Idling: 18.0-25.0% • Engine speed 2,500 rpm (no load): 13.5-19.5% AT • Idling: 20.0-28.0% • Engine speed 2,500 rpm (no load): 15.0-21.0%	• The following PIDs – BARO, IAT, MAF, RPM	-
LONGFT1 (long term fuel trim)	%		• Idling after warm-up: Approx.-12.5-12.5%	• The following PIDs – ECT, LOAD, MAF, RPM, SHRTFT	-
MAF (Mass airflow)	g/s		MT • Idling after warm-up: 3.8-4.7 g/s • Engine speed 2,500 rpm (no load): 8.7-11.7 g/s AT • Idling after warm-up: 4.4-5.3 g/s • Engine speed 2,500 rpm (no load): 9.5-12.5 g/s	• MAF sensor	5N
	V		MT • Idling after warm-up: 1.16-1.23 V • Engine speed 2,500 rpm (no load): 1.49-1.64 V AT • Idling after warm-up: 1.21-1.29 V • Engine speed 2,500 rpm (no load): 1.54-1.67 V
MIL (Malfunction indicator lamp)	On/Off		• Ignition switch ON: On • Idling: Off	• MIL	-
MIL_DIS (Travelled distance since the MIL illuminated)	Indicate the travelled distance since the MIL illuminated
MOP_POS (Metering oil pump)	-		• When the initial set function is operating: value is increased	• The following PIDs – BARO, ECT, IAT, MOP_SW, RPM • Metering oil pump	2V, 2W, 2Y, 2AB
MOP_SW (Metering oil pump switch)	On/Off		• When the initial set function is operating: On	• Metering oil pump switch	2N
O2S11 (Front HO2S)	mA		• Idling after warm-up: Approx. 0 mA	• Front HO2S	2B
O2S12 (Rear HO2S)	V		• Idling after warm-up: 0.1 -0.9 V	• Rear HO2S	2Q
PSCNTV (AIR solenoid valve control)	On/Off		• AIR pump operating: On • AIR pump not operating: Off	• The following PIDs – CATT11_DSD, ECT, IAT • AIR solenoid valve	1O
PCM_T (PCM temperature sensor)	V		• Ignition switch at ON position: Indicate the PCM temperature sensor output voltage	• PCM	-
RO2FT1 (Rear HO2S fuel trim)	-		• Idling after warm-up: Approx.-0.03-0.03	• The following PID – O2S12	-
RPM (Engine speed)	RPM		• Engine runs: Indicate the engine speed	• Eccentric shaft position sensor	-
PREDELI (Pre-delivery mode)	On/Off		• This PID is for the off-line inspection.
SC_SET (Cruise set indicator light)	On/Off		• Cruise set indicator light ON: On • Cruise set indicator light OFF: Off	• Cruise indicator light	-
SCCS (Cruise control switch)	V		• Press ON/OFF: Approx. 0 V • Press CANCEL: Approx. 0.25 V • Press SET/COAST: Approx. 1.18 V • Press RES/ACCEL: Approx. 2.50 V • Others: Approx. 5.0 V	• Cruise control switch	5V
SELTESTDTC (DTC)	Indicate the Number of the DTCs detected by the KOEO/KOER self-test function
SHRTFT1 (Short term fuel trim (front))	%		• Idling after warm-up: -4-4%	• The following PIDs – ACSW, APP, B+, BARO, ECT, IAT, KNOCKR, LOAD, MAF, O2S11, O2S12, RPM, TP, VSS	-
SHRTFT12 (Short term fuel trim (rear))	%		• Idling after warm-up: Approx. 99%	• The following PIDs – ACSW, APP, B+, BARO, ECT, IAT, KNOCKR, LOAD, MAF, O2S11, O2S12, RPM, TP, VSS	-
SPARK-L (Ignition timing)	°(BTDC)		• Ignition switch ON: BTDC 0° • Idling after warm-up: BTDC Approx. 5°	• The following PIDs – ACSW, APP, ECT, IAT, IVS, KNOCKR, LOAD, MAF, RPM, TP, VSS • Ignition coil (L/F)	2AA
SPARK-T (Ignition timing)	°(BTDC)		• Ignition switch ON: BTDC 20° • Idling after warm-up: BTDC Approx. 23°	• The following PIDs – ACSW, APP, ECT, IAT, IVS, KNOCKR, LOAD, MAF, RPM, TP, VSS • Ignition coil (T/F)	2AD
SSV (SSV solenoid valve)	On/Off		• High engine speed and high load after warm-up: On • Idling: Off	• The following PIDs – BARO, ECT, IAT, MAF, RPM, TP • SSV solenoid valve	1L
test	On/Off		• Test mode: On • Except above: Off	-	-
TIRESIZE (Tire revolution per mile)	rev/mile		• Indicate the tire revolution per a mile
TP (TP)	V		• CTP: Approx. 0.8 V • WOT: Approx. 3.92 V	• The following PIDs – TP1, TP2	-
TP_REL (Relative TP)	%		• CTP: Approx. 7% • WOT: Approx. 100%	• The following PIDs – TP, TP1, TP2	-
TP1 (TP sensor 1)	%		• CTP: 8.0-16.0% • WOT: 76.5-81.9%	• TP sensor No.1	1J
	V		• CTP: 0.40-0.80 V • WOT: 3.825-4.095 V
TP2 (TP sensor 2)	%		• CTP: 23.6-35.6% • WOT: 80.66-86.06%	• TP sensor No.2	1M
	V		• CTP: 1.18-1.78 V • WOT: 4.033-4.303 V
TPCT (TP sensor voltage at CTP)	V		• Ignition switch ON (CTP): 0.01 V	• TP sensor	1J, 1M
VSS (Vehicle speed)	km/h	MPH	• Vehicle running: Indicate the vehicle speed	• ABS HU/CM • DSC HU/CM	-

*¹  :

Calculated value; differs from terminal voltage

*²  :

Refrigerant pressure switch (middle) turns off when the refrigerant pressure is 1.11 MPa {11.3 kgf/cm², 161 psi} or less

*³  :

Refrigerant pressure switch (middle) turns on when the refrigerant pressure is 1.60 MPa {16.3 kgf/cm², 232 psi} or more

*⁴  :

The voltage may vary excessively depending on the weather or battery conditions.

^*5 :

With Immobilizer system

^*6 :

Without Immobilizer system