PCM INSPECTION [L8, LF]

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.

Inspection Using An Oscilloscope (Reference)

Throttle control (+) signal

• 2A (+)-Negative battery terminal (-)

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

• Idle (Accelerator pedal released)

Throttle control (-) signal

• 2B (+)-Negative battery terminal (-)

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

• Idle (Accelerator pedal released)

Purge control signal

• 2C (+)-Negative battery terminal (-)

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

• Idle after warm-up

OCV control signal

• 2E (+)-Negative battery terminal (-)

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

• Idle after warm-up

CMP signal

• 2S (+)-Negative battery terminal (-)

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

• Idle after warm-up

CKP signal

• 2W (+)-Negative battery terminal (-)

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

• Idle after warm-up

Generator field coil control signal

• 2AI (+)-Negative battery terminal (-)

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

• Idle after warm-up

Generator output voltage signal

• 2AJ (+)-Negative battery terminal (-)

• 2 V/DIV (Y), 1 ms/DIV (X), DC range

• Idle after warm-up

Ignition timing signals

• 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 (-)

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

• Idle after warm-up

Fuel injection signals

• 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 (-)

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

• Idle after warm-up

A/F sensor heater control signal

• 2BG (+)-Negative battery terminal (-)

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

• 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.

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)

Item (definition)	Unit/Condition				Condition/Specification (Reference)	Inspection item(s)	PCM terminal
AC_REQ (Refrigerant pressure switch (high, low)	Off/On				• Refrigerant pressure is more than the specification or less than the specification. (Refrigerant pressure switch (high, low) is off.): Off • Except above: On	• Refrigerant pressure switch (high, low) • A/C amplifier	1AU
ACCS (A/C relay)	Off/On				• A/C relay is ON: On • A/C relay is OFF: Off	• The following PIDs - CPP*1, CPP/PNP*1, ECT, RPM, TP, TR*2, AC_REQ, COLP	1I
AFR (Air/fuel ratio)	-				• Idle after warm-up: Approx. 1	• A/F sensor	2AD
AFR_ACT (Actual air/fuel ratio)	-				• Idle after warm-up: Approx. 1	• A/F sensor • HO2S	-
ALTF (Generator field coil control duty value)	%				• Ignition switch is turned to the ON position: 0% • Idle, E/L is operating: Duty value increases.	• Generator	2AI
ALTT V (Generator output voltage)	V				• Idle (no E/L): Approx. 14 V (This is an internal calculation value and differs from the terminal voltage.)	• Generator	2AJ
APP (Accelerator pedal position)	%				• Accelerator pedal released: 0% • Accelerator pedal depressed: 100%	• The following PIDs - APP1, APP2	1AO, 1AP
APP1 (APP sensor No.1)	%				• Accelerator pedal released: Approx. 32% • Accelerator pedal depressed: Approx. 78%	• APP sensor	1AO
	V				• Accelerator pedal released: Approx. 1.6 V • Accelerator pedal depressed: Approx. 3.9 V
APP2 (APP sensor No.2)	%				• Accelerator pedal released: Approx. 21% • Accelerator pedal depressed: Approx. 67%	• APP sensor	1AP
	V				• Accelerator pedal released: Approx. 1.0 V • Accelerator pedal depressed: Approx. 3.4 V
ARPMDES (Target engine speed)	RPM				• Indicate the target engine speed.	• The following PIDs - CPP*1, CPP/PNP*1, ECT, IAT, RPM, TP, MAF, MAP, VSS, AC_REQ, COLP	-
BARO (Barometric pressure)	Pa				• Ignition switch is turned to the ON position: Indicate the barometric pressure	-	-
	V				• Ignition switch is turned to the ON position (at sea level): 4.1 V
BOO (Brake switch)	Off/On				• Brake pedal depressed: On • Brake pedal released: Off	• Brake switch	1AB, 1AF
BPA*5 (Brake pressure applied switch)	Off/On				• Brake pedal depressed: On • Brake pedal released: Off	• Brake switch	-
CATT11_DSD (Catalyst temperature)	°C		°F		• Ignition switch is turned to the ON position: Indicate the catalyst temperature	-	-
CHRGLP (Generator warning light)	Off/On				• Idle, Generator warning light illuminate: On • Idle, Generator warning light not illuminate: Off	• Generator warning light	-
COLP (Refrigerant pressure switch (middle))	OFF/ON				• Refrigerant pressure is more than the specification. (Refrigerant pressure switch (middle) is on.): On • Refrigerant pressure is less than the specification. (Refrigerant pressure switch (middle) is off.): Off	• Refrigerant pressure switch (middle)	1J
CPP*1 (Clutch pedal position)	Off/On				• Clutch pedal depressed: On • Clutch pedal released: Off	• CPP switch	1D
CPP/PNP*1 (Shift lever position)	Drive/Neutral				• Neutral: Neutral • Other than neutral: Drive	• Neutral switch	1X
DTCCNT (Number of DTC detected)	-				• Number of DTCs stored	-	-
ECT (Engine coolant temperature)	°C		°F		• Ignition switch is turned to the ON position: Indicate the ECT	• ECT sensor	2AH
	V				• ECT is 20 °C {68 °F}: Approx. 3.0 V • ECT is 80 °C {176 °F}: Approx. 0.9 V
EQ_RAT11 (Actual lambda signal)	-				• Idle after warm-up: Approx. 1	• A/F sensor	-
EQ_RAT11_DSD (Target lambda)	-				• Target lambda (Excess air factor = supplied air amount / theoretical air/fuel ratio)	• A/F sensor	-
ETC_ACT (Throttle control)	°				• Accelerator pedal released: Approx. 0 ° • Accelerator pedal depressed: Approx. 94.5 °	• TP sensor	-
ETC_DSD (Throttle control desired)	%				• Indicate the target throttle valve opening ratio	• The following PIDs - APP, RPM	-
	°				• Indicate the target throttle valve opening angle
EVAPCP (Purge solenoid valve duty value)	%				• Ignition switch is turned to the ON position: 0% • Increase the engine speed (after warm-up): Duty value rises	• The following PIDs - ECT, IAT, RPM, TP, MAF, O2S11, O2S12, BOO, VPWR • Purge solenoid valve	2C
FAN1 (Cooling fan relay No.1 control signal)	Off/On				• During test mode CTP: Off WOT: On	• The following PIDs - ECT, test, TP	1M
FAN2 (Cooling fan relay No.2 control signal)	Off/On				• During test mode CTP: Off WOT: On	• The following PIDs - ECT, test, TP	1N
FAN3 (Cooling fan relay No.3 control signal)	Off/On				• During test mode CTP: Off WOT: On	• The following PIDs - ECT, test, TP	1R
FP (Fuel pump relay)	Off/On				• Ignition switch is turned to the ON position and a certain period has elapsed: Off • Cranking: On • Idle: On	• Fuel pump relay	1H
FUELPW (Fuel injector duration)	sec				• Idle: Approx. 2.0 ms	• The following PIDs - CPP*1, CPP/PNP*1, ECT, IAT, RPM, TP, MAF, O2S11, O2S12, MAP, VSS, TR*2, BOO, AC_REQ, COLP, VPWR	2BB, 2BC, 2BD, 2AZ
FUELSYS (Fuel system status)	OL/CL/ OL-Drive/ OL-Fault/ CL-Fault				• Idle after warm-up: CL	• The following PIDs - CPP*1, CPP/PNP*1, ECT, IAT, RPM, TP, MAF, O2S11, O2S12, MAP, VSS, TR*2, BOO, AC_REQ, COLP, VPWR	-
GENVDSD (Target generator voltage)	V				• Indicate the target generated voltage	• The following PIDs - ECT, IAT, RPM, VSS, ALTT V, VPWR • Generator	-
HTR11 (A/F sensor heater control)	Off/On				• Ignition switch is turned to the ON position: Off • Idle: On	• The following PIDs - ECT, IAT, RPM, TP, MAF, MAP, VPWR	2BG
HTR12 (HO2S heater control)	Off/On				• Ignition switch is turned to the ON position: Off • Idle: On	• The following PIDs - ECT, IAT, RPM, TP, MAF, MAP, VPWR	2BE
IAT (Intake air temperature)	°C		°F		• Ignition switch is turned to the ON position: Indicate the IAT	• IAT sensor	1AT
	V				• IAT is 20 °C {68 °F}: Approx. 2.4 V • IAT is 60 °C {140 °F}: Approx. 0.9 V
IMRC*4 (Variable tumble control)	Off/On				• ECT less than 60 °C {142 °F} and engine speed less than 3,750 rpm: On • ECT 60 °C {142 °F} or more and engine speed 3,750 rpm or more: Off	• The following PIDs - ECT, RPM, TP	2I
IMTV (Variable intake air control)	Off/On				• Engine speed is less than 4,750 rpm: On • Engine speed is 4,750 rpm or more: Off	• The following PIDs - RPM	2J
INGEAR (Gears are engaged)	Off/On				MT • When the following conditions are satisfied: On - Other than neutral - Clutch pedal released • Except above: Off	• CPP switch • Neutral switch	1D,1X
					AT • Driving range: On • Except above: Off	• TR switch	-
IVS (CTP condition)	Idle/Off Idle				• Idle: Idle • Other than idle: Off Idle	• The following PIDs - TP	-
KNOCKR (Knocking retard)	°				• Ignition switch is turned to the ON position: 0 ° • Idle: 0 °	• KS	2U
LOAD (Engine load)	%				• Idle after warm-up: Approx. 23%	• The following PIDs - MAP, IAT, MAF, RPM	-
LONGFT1 (Long term fuel trim)	%				• Idle after warm-up: Approx. -15-+15%	• The following PIDs - CPP*1, CPP/PNP*1, ECT, IAT, RPM, TP, MAF, O2S11, O2S12, MAP, VSS, TR*2, BOO, AC_REQ, COLP, VPWR	-
MAF (Mass air flow)	g/sec				• Ignition switch is turned to the ON position: Approx. 0 g/s • Idle: Approx. 4.0 g/s	• MAF sensor	1AK
	V				• Ignition switch is turned to the ON position: Approx. 0.7 V • Idle: Approx. 1.4 V
MAP (Manifold absolute pressure)	Pa				• Ignition switch is turned to the ON position: Indicate the MAP	• MAP sensor	2AG
	V				• Ignition switch is turned to the ON position (at sea level): 4.1 V • Idle after warm-up: Approx. 1.2 V
MIL (Malfunction indicator lamp)	Off/On				• Idle, MIL illuminate: On • Idle, MIL not illuminate: Off	• MIL	-
MIL_DIS (Travelled distance since MIL illuminated)	km		mile		Travelled distance since MIL illuminated		-
O2S11 (A/F sensor)	A				• Idle after warm-up: Approx. 0 mA	• A/F sensor	2AD
O2S12 (HO2S)	V				• Idle after warm-up: Alternates between 0 and 1.0 V	• HO2S	2Q
PSP (PSP switch)	Low/High				• Steering wheel at straight ahead position: Low • While turning steering wheel: High	• PSP switch	2T
RFCFLAG (PCM adaptive memory produce verification)	Not Learnt/ Learnt				• Idle (after running PCM adaptive memory procedure drive mode): Learnt • Right after the negative battery cable is disconnected (before running PCM adaptive memory procedure drive mode): Not Learnt	• Verify after repair procedure	-
RO2FT1 (HO2S fuel trim)	-				• Idle after warm-up: Approx. 0	• The following PIDs - O2S12	-
RPM (Engine speed)	RPM				• When the engine is running: Indicate the engine speed	• CKP sensor	2W
SCCS*5 (Cruise control switch)	V				• ON OFF switch pressed in: Approx. 0 V • CANCEL switch pressed in: Approx. 1.1 V • SET/- switch pressed in: Approx. 3.1 V • RES/+ switch pressed in: Approx. 4.2 V • Except above: Approx. 5.0 V	• Cruise control switch	1AQ
SEGRP (EGR control)	-				• Ignition switch is turned to the ON position: 0 Step • Idle: 0 Step • Engine speed is 1,200-4,200 rpm: 0-52 Step	• EGR valve	2K, 2G, 2L, 2H
SEGRP DSD (EGR valve position desired)	%				• Ignition switch is turned to the ON position: 0% • Idle: 0% • Engine speed is 1,200-4,200 rpm: 0-100%	• The following PIDs - MAF, TP, ECT, RPM, VSS	-
SELTESTDTC (Diagnostic trouble codes)	-				• Indicate the diagnostic trouble codes	-	-
SHRTFT1 (Short term fuel trim (front))	%				• Idle after warm-up: -25- 25%	• The following PIDs - CPP*1, CPP/PNP*1, ECT, IAT, RPM, TP, MAF, O2S11, O2S12, MAP, VSS, TR*2, BOO, AC_REQ, COLP, VPWR	-
SHRTFT12 (Short term fuel trim (rear))	%				• Idle after warm-up: Approx. 99%	• The following PIDs - CPP*1, CPP/PNP*1, ECT, IAT, RPM, TP, MAF, O2S11, MAP, VSS, TR*2, BOO, AC_REQ, COLP, VPWR	-
SPARKADV (Ignition timing)	°				• Indicate the ignition timing	• The following PIDs - CPP*1, CPP/PNP*1, ECT, IAT, RPM, TP, MAF, KNOCKR, TR*2, BOO, AC_REQ, COLP	2S
test (Test mode)	Off/On				• Test mode On: On • Test mode Off: Off	-	-
TIRESIZE (Tire revolution per mile)	rev/mile				• Indicate the tire revolution per a mile		-
TP REL (Throttle position signal (relative value))	%				• Accelerator pedal released: Approx. 10% • Accelerator pedal depressed: Approx. 81%	• The following PIDs - TP1, TP2	-
TP1 (TP sensor No.1)	%				• Accelerator pedal released: Approx. 10% • Accelerator pedal depressed: Approx. 90%	• TP sensor	2AK
	V				• Accelerator pedal released: Approx. 0.5 V • Accelerator pedal depressed: Approx. 4.5 V
TP2 (TP sensor No.2)	%				• Accelerator pedal released: Approx. 10% • Accelerator pedal depressed: Approx. 90%	• TP sensor	2AL
	V				• Accelerator pedal released: Approx. 4.5 V • Accelerator pedal depressed: 0.5 V
TPCT (TP sensor voltage at CTP)	V				• Ignition switch is turned to the ON position: Approx. 0.5 V	• The following PIDs - TP1, TP2	-
VPWR (Battery positive voltage)	V				• Indicate the battery voltage	• Battery	1BA
VSS (Vehicle speed)	KPH				• Vehicle running: Indicate the vehicle speed	• ABS, DSC HU/CM • TCM	1AM, 1AI
VT ACT1*3 (Actual valve timing)	°				• Idle: Approx. 0 ° • Racing: 0-25 °	• The following PIDs - ECT, RPM, TP, MAF • OCV	2E
VT DIFF1*3 (Difference between target valve timing and actual valve timing)	°				• Idle: 0 °	• The following PIDs - ECT, RPM, TP, MAF • OCV	-
VT DUTY1*3 (OCV control)	%				• Idle: Approx. 10%	• The following PIDs - ECT, RPM, TP, MAF	2E

*¹ :

MT

*² :

AT

*³ :

With variable valve timing mechanism

*⁴ :

With variable tumble system

*⁵ :

With power retractable hardtop (6MT, 6AT)