PCM INSPECTION [LF]

Without Using the SST

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)

Cooling fan control signals

PCM terminals

• 1W(+)-1AA(-)

Oscilloscope setting

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition

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

IAC signal

PCM terminals

• 2E(+)-2AA(-)

Oscilloscope setting

• 5 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition

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

PCM terminals

• 2F(+)-2AA(-)

Oscilloscope setting

• 3 V/DIV (Y), 1.5 ms/DIV (X), DC range

Vehicle condition

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

HO2S (front) heater control signal

PCM terminals

• 2G(+)-2AA(-)

Oscilloscope setting

• 5 V/DIV (Y), 125 ms/DIV (X), DC range

Vehicle condition

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

CMP sensor signal

PCM terminals

• 2U(+)-2AA(-)

Oscilloscope setting

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

Vehicle condition

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

PCM terminals

• 2V(+)-2AA(-)

Oscilloscope setting

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

Vehicle condition

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

CKP sensor signal

PCM terminals

• 2Y(+)-2AA(-)

Oscilloscope setting

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

Vehicle condition

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

PCM terminals

• 2Z(+)-2AA(-)

Oscilloscope setting

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

Vehicle condition

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

HO2S (front) signal

PCM terminals

• 2AG(+)-2AA(-)

Oscilloscope setting

• 0.2 V/DIV (Y), 500 ms/DIV (X), DC range

Vehicle condition

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

Generator output voltage signal

PCM terminals

• 2AM (+)-2AA (-)

Oscilloscope setting

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

Vehicle condition

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

Generator field coil control signal

PCM terminals

• 2AQ(+)-2AA(-)

Oscilloscope setting

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

Vehicle condition

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

Fuel injection control

PCM terminals

• Fuel Injection No.1: 2BB(+)-1AZ(-)

• Fuel Injection No.2: 2BC(+)-1AZ(-)

• Fuel Injection No.3: 2BD(+)-1AZ(-)

• Fuel Injection No.4: 2AZ(+)-1AZ(-)

Oscilloscope setting

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

Vehicle condition

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

IGT1, IGT2 control signals

PCM terminals

• IGT1 (No.1): 2BE(+)-1BG(-)

• IGT2 (No.2): 2BF(+)-1BC(-)

• IGT3 (No.3): 2BG(+)-1BG(-)

• IGT4 (No.4): 2BH(+)-1BC(-)

Oscilloscope setting

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

Vehicle condition

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

Using SST (WDS or Equivalent)

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 [LF].)

- Main relay (See RELAY INSPECTION.)

1. Connect the SST (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

PID/DATA monitor table (reference)

Monitor item (Definition)	Unit/Condition		Condition/Specification (Reference)	Inspection item	PCM terminal
AC_REQ (Refrigerant pressure switch (low pressure switch, high pressure switch))	On/Off		• Refrigerant pressure is more than the specification or less than the specification. (Refrigerant pressure switch (low pressure switch, high pressure switch) is off.): Off • Others: On	• Refrigerant pressure switch (low pressure switch, high pressure switch)	1AP
ACCS (A/C relay)	On/Off		• Ignition switch ON: Off • A/C switch ON and fan switch ON at idle: On	The following PIDs: RPM, TP, ECT, ACSW. A/C relay	1AN
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	The following PIDs: IAT, ECT, RPM, VPWR, ALTT V. Generator	2AQ
ALTT V (Generator output voltage)	V		• Ignition switch ON: 0 V • Idle: Approx. 14 V*1 (E/L not operating)	Generator	2AM
ARPMDES (Target engine speed)	RPM		• No load: 650 RPM • A/C on*2 (low load): 750 RPM • A/C on*2 (high load): 750 RPM • E/L on*3 (38-48 A): 700 RPM • E/L on*3 (48 A or more): 750 RPM	The following PIDs: IAT, RPM, MAP, ECT, MAF, TP, INGEAR, ACSW, ALTT V. IAC valve CKP sensor	-
BARO (Barometric pressure)	KPa		• ignition switch ON: indicate the atmospheric pressure	BARO sensor	1AG
	V		• Approx. 4 V (at sea level)
BOO (Brake switch)	On/Off		• Brake pedal depressed: On • Brake pedal released: Off	Brake switch	1AU
CATT11_DSD (Catalyst temperature)	°C	°F	• Idle: approx. 350 °C (ECT 100 °C)	-	-
CHRGLP (Generator warning light)	On/Off		• Ignition switch ON: On • Idle: Off	Perform applicable DTC troubleshooting.	-
COLP (Refrigerant pressure switch (middle))	On/Off		• Refrigerant pressure switch (middle) ON*4 at idle: On • Refrigerant pressure switch (middle) OFF*5 at idle: Off	Refrigerant pressure switch	1R
CPP (Clutch pedal position)	On/Off		• Clutch pedal depressed: On • Clutch pedal released: Off	CPP switch	1O
CPP/PNP (Shift lever position)	Drive/Neutral		• Neutral position: Neutral • Others: Drive	Neutral switch	1S
DTCCNT (Number of DTC detected)	-		-	Perform applicable DTC troubleshooting	-
ECT (Engine coolant temperature)	°C	°F	• Ignition switch ON: indicate the ECT	ECT sensor	2AK
	V		• ECT 20 °C {68 °F}: 3.04-3.14 V • ECT 60 °C {140 °F}: 1.29-1.39 V
EQ_RAT_DSD (Theoretical air/fuel ratio coefficient to calculate target air/fuel ratio)	-		• Idle: approx. 1 • Racing (after warm up): 0.8-1	The following PIDs: IAT, RPM, ECT, MAF, O2S11,BARO, INGEAR, VPWR.	-
EVAPCP (Purge solenoid valve duty value)	%		• Ignition switch ON: 0% • Idle: 0-9%	The following PIDs: IAT, RPM, ECT, MAF, O2S11,BARO, INGEAR, VPWR.	2AN
FAN_DUTY (Cooling fan control)	%		• When all of following condition are met: 90% - Test mode ON - WOT	The following PIDs: RPM, TP, ECT, ACSW, COLP, TEST. Fan control module	1W
FP (Fuel pump relay)	On/Off		• Ignition switch ON: On (1 s) →Off • Idle: ON • Cranking: On	The following PIDs: RPM. Fuel pump relay	1AR
FUELPW (Fuel injector duration)	ms		• Ignition switch ON: 0 ms • Idle (after warm up): approx. 2.0 ms	The following PIDs: IAT, MAF, TP, MAP, ECT, RPM, O2S11, O2S12, INGEAR, ACSW, VPWR, ALTT V. Fuel injector	2AZ 2BB 2BC 2BD
FUELSYS (Fuel system status)	OL/OL_Fault/CL_Fault/CL/OL_Drive		• Ignition switch ON: OL-Drive (Open loop) • Idle (after warm up): CL (Closed loop)	The following PIDs: IAT, MAF, TP, MAP, ECT, RPM, O2S11, O2S12, INGEAR, ACSW, VPWR, ALTT V. Fuel injector	-
GENVDSD (Generator voltage desired)	V		• Ignition switch ON: 0 V • Idle: Approx. 14 V*1 (E/L not operating)	Perform applicable DTC troubleshooting.	-
HTR11 (HO2S heater (front))	On/Off		• Idle (after warm up): On⇔Off	The following PIDs: IAT, MAF, TP, ECT, RPM, ACSW.	2G
HTR12 (HO2S heater (rear))	On/Off		• Ignition switch ON: Off (HO2S heater not operating) • Idle: On (HO2S heater operating)	The following PIDs: IAT, MAF, ECT, RPM, ACSW.	2C
IAC (IAC valve)	%		• Ignition switch ON: 0 % • Idle: Approx. 20% (ECT 100 °C {212 °F} and E/L not operating)	The following PIDs: IAT, RPM, MAP, ECT, MAF, TP, INGEAR, ACSW. IAC valve	2E 2F
IAT (Intake air temperature)	°C	°F	• Ignition switch ON: indicate the IAT	IAT sensor	1AH
	V		• IAT 20 °C {68 °F}: 2.4-2.6 V • IAT 30 °C {86 °F}: 1.7-1.9 V
IMRC (Variable tumble solenoid valve)	On/Off		• Engine speed is below approx. 3,750 rpm and low ECT: On • Others: Off	The following PIDs: TP, ECT, RPM. Variable tumble solenoid valve	2AI
IMTV (Variable Intake-air solenoid valve)	On/Off		• Engine speed is below approx. 4,750 rpm: On • Others: Off	The following PIDs: RPM. Variable intake-air solenoid valve	2AJ
INGEAR (Load/no load condition)	On/Off		• CPP or CPP/PNP is ON: Off • Others: On	Perform applicable DTC troubleshooting.	1O 1S
IVS (CTP condition)	Idle/Off Idle		• CTP: Idle • Others: Off Idle	Perform applicable DTC troubleshooting.	-
KNOCKR (Knocking retard)	°		• Ignition switch ON: 0 ° • Idle: 0 °	KS	2Q 2R
LOAD (Engine load)	%		• Ignition switch ON: 0% • Idle (after warm up): approx.20%	MAF sensor	-
LONGFT1 (long term fuel trim)	%		• Idle (after warm up): -15-20%	Perform applicable DTC troubleshooting.	-
MAF (Mass airflow)	g/s		• Ignition switch ON: approx. 0 g/s • Idle (after warm up): approx. 2.5 g/s	MAF sensor	1AC
	V		• Ignition switch ON: approx. 0.7 V • Idle (after warm up): approx. 1.2 V
MAP (Manifold absolute pressure)	KPa		• Ignition switch ON (at sea level): approx. 101 kPa • Idle: approx. 30 kPa	MAP sensor	2AL
	V		• Ignition switch ON (at sea level): approx. 4.1 V • Idle: approx. 1.2 V
MIL (Malfunction indicator lamp)	On/Off		• DTC stored: On • DTC not stored: Off	Perform applicable DTC troubleshooting.	-
MIL_DIS (Travelled distance since MIL illuminated)	km	mile	Indicate the travelled distance since the MIL illuminated
O2S11 (Front HO2S)	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	HO2S (front)	2AG
O2S12 (Rear HO2S)	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	HO2S (rear)	2AH
PSP (Power steering pressure signal)	High/Low		• Steering wheel is in straight ahead position: Low • Steering wheel is fully turned: High	Power steering	-
RFCFLAG (Readness function code)	Learnt/Not Learnt		• Before running PCM adaptive memory procedure drive mode: Not Learnt • After running PCM adaptive memory procedure drive mode: Learnt	Run PCM adaptive memory procedure drive mode.	-
RO2FT1 (Rear oxygen sensor fuel trim)	-		• Idle (after warm up): approx. -2-2	Perform applicable DTC troubleshooting.	2AH
RPM (Engine speed)	RPM		• No load: 600-700 rpm • E/L operating: 650-800 rpm • A/C ON: 700-800 rpm	CKP sensor	2Y 2Z
SEGRP (EGR valve (stepping motor) position)	Step		• Ignition switch ON: 0 step • Idle: 0 step • Cranking: 0-52 steps	The following PIDs: MAF, TP, ECT, RPM, VSS. EGR valve	2AR 2AU 2AV 2AY
SEGRP DSD (Desired EGR valve (stepping motor) position)	%		• When the PCM control the EGR system: indicate the desired EGR valve position	The following PIDs: MAF, TP, ECT, RPM, VSS. EGR valve	-
SHRTFT1 (Short term fuel trim)	%		• Idle (after warm up): approx.-30-25%	Perform applicable DTC troubleshooting.	-
SHRTFT11 (Short term fuel trim)	%		• Idle (after warm up): approx.-5-0%	Perform applicable DTC troubleshooting.	2AG
SHRTFT12 (Short term fuel trim)	%		• Under any condition: approx. 0%	Perform applicable DTC troubleshooting.	2AH
SPARKADV (Ignition timing)	° (BTDC)		• Ignition switch ON: BTDC 10° • Idle: BTDC approx. 4-10°	The following PIDs: MAF, TP, ECT, RPM, INGEAR, ACSW, VPWR. Ignition timing	2BE 2BF 2BG 2BH
test (Test mode)	On/Off		-	-	-
TIRESIZE (Tire size)	-		• Indicate the tire revolution per a mile
TP (TP)	%		• CTP: 13-23% • WOT: 86-96%	TP sensor	2I
	V		• CTP: 0.65-1.15 V • WOT: 4.3-4.8 V
TP REL (Relative TP)	%		• CTP: approx. 0% • WOT: approx. 100%	TP sensor	2I
TPCT (TP sensor voltage at CTP)	V		• Approx. 0.65-1.15 V	TP sensor	2I
VPWR (Battery positive voltage)	V		• Ignition switch ON: B+	Main relay Battery	1A 1BA 1BD 1BE
Vref (Reference voltage)	V		• Ignition switch ON: approx. 5.0 V	Perform applicable DTC troubleshooting.	1AE
VSS (Vehicle speed)	KPH	MPH	• Ignition switch ON: indicate the vehicle speed	Perform applicable DTC troubleshooting.	-

*¹ :

Calculated value; differs from terminal voltage

*² :

A/C compressor pressure switch

*³ :

Alternator generating current value

^*4 :

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}

^*5 :

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}