Engine Control System (Aj): Removal & Installation

PCM REMOVAL/INSTALLATION [AJ]

Note. To replace the PCM, connect the M-MDS and perform the PCM configuration. (See PCM REPLACEMENT [AJ] ).

Scheme 111

Scheme 111: PCM REMOVAL/INSTALLATION [AJ]

Disconnect the negative battery cable.
Remove in the order indicated in the table.
Install in the reverse order of removal.

Scheme 112

Scheme 112: PCM Connector Connection Note

Scheme 113

Scheme 114

Verify that the PCM connector lever is tilted towards the wiring harness side as shown in the figure.
Insert the PCM connector straight until it contacts the PCM and verify that the lever reverts upward naturally.
Push the lever until a click is heard.

Scheme 115

Scheme 115: PCM INSPECTION [AJ]

Connect the M-MDS to the DLC-2.
Turn the ignition switch to ON position.
Measure the PID value. If PID value is not within the specification, follow the instructions in Action column.

PID/DATA MONITOR table (Reference)

Monitor item (Definition)	Unit/Condition	Condition/Specification (Reference)	Inspection item (s)	PCM terminal
AAT (Ambient air temperature)	°C or °F	Ignition switch at ON position: Indicate the ambient air temperature	IAT sensor (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [AJ] ).
AC REQ (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 (See CLIMATE CONTROL UNIT INSPECTION [L3, AJ] ). Refrigerant pressure switch (See REFRIGERANT PRESSURE CHECK [L3, AJ] ).	1AN
ACCS (A/C relay)	On/Off	A/C is operating: On Ignition switch is ON: Off	Inspect following PIDs: ECT, RPM, TP REL A/C switch (See CLIMATE CONTROL UNIT INSPECTION [L3, AJ] ).	1AW
ALTF (Generator field coil control duty value)	%	Ignition switch is ON: 0% Idling, E/L is operating: Duty value rises	Inspect following PIDs: ALTT V, ECT, IAT, RPM	2AP
ALTT V (Generator output voltage)	V	Ignition switch is ON: 0 V Idling: 14-16 V	Generator (See GENERATOR INSPECTION [L3, AJ] ).	2AU
APP (Accelerator pedal position)	%	CTP: Approx. 0% WOT: Approx. 99.2%	Inspect following PIDs: APP1, APP2 APP sensor (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [AJ] ).	1AP, 1AO
APP1 (APP sensor No.1)	%	AP is released: 31.0-32.4% AP is depressed: 69.8-81.8%	APP sensor (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [AJ] ).	1AO
APP1 (APP sensor No.1)	V	AP is released: 1.55-1.62 V AP is depressed: 3.49-4.09 V		1AO
APP2 (APP sensor No.2)	%	AP is released: 20.2-21.4% AP is depressed: 58.8-70.8%	APP sensor (See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [AJ] ).	1AP
APP2 (APP sensor No.2)	V	AP is released: 1.01-1.07 V AP is depressed: 2.94-3.54 V		1AP
ARPMDES (Target engine speed)	RPM	Idling (no load): 700-800 RPM	Inspect following PIDs: ALTT V, ECT, IAT, INGEAR, MAF, MAP, RPM, PSP, TP REL CKP sensor (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [AJ] ).
BARO (Barometric pressure)	KPa, Bar, psi	Ignition switch is ON at sea level: Approx. 101 kPa {1.01 Bar, 14.6 psi}	EGR boost sensor (See EGR BOOST SENSOR INSPECTION [AJ] ).	1AL
BARO (Barometric pressure)	V	Ignition switch is ON at sea level: Approx. 4.1 V	EGR boost sensor (See EGR BOOST SENSOR INSPECTION [AJ] ).	1AL
BARO/EGR (EGR boost sensor solenoid valve)	On/Off	Ignition switch is ON: Off Idling: Off	EGR boost sensor solenoid valve (See EGR BOOST SENSOR SOLENOID VALVE INSPECTION [AJ] ).	1AX
BOO (Brake switch No.1)	On/Off	Brake pedal is depressed: On Brake pedal is released: Off	Brake switch (See BRAKE SWITCH INSPECTION ).	1AJ
BPA (Brake switch No.2)	On/Off	Brake pedal is depressed: Off Brake pedal is released: On	Brake switch (See BRAKE SWITCH INSPECTION ).	1AF
CATT11_DSD (Estimated catalytic converter temperature)	°C or °F	Idling after warm-up: indicate the WU-TWC (RH) forecast temperature	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
CATT21_DSD (Estimated catalytic converter temperature)	°C or °F	Idling after warm-up: indicate the WU-TWC (LH) forecast temperature	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
CHRGLP (Generator warning light)	On/Off	Ignition switch is ON: On Idling: Off	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
COLP (Refrigerant pressure switch - middle)	On/Off	Idling, refrigerant pressure switch (middle) is on: On Idling, refrigerant pressure switch (middle) is off: Off	Refrigerant pressure switch (See REFRIGERANT PRESSURE CHECK [L3, AJ] ).	1AH
CPP (1) (Clutch pedal position)	On/Off	Clutch pedal is depressed: On Clutch pedal is released: Off	Clutch switch (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [AJ] ).	1AB
CPP/PNP (1) (Shift lever position)	Neutral/Drive	Gear is neutral position: Neutral Gear is not neutral position: Drive	Neutral switch (See NEUTRAL SWITCH INSPECTION [AJ] ).	2X
DTCCNT (Number of DTC detected)			Perform applicable DTC troubleshooting. (See DTC TABLE [AJ] ).
ECT (Engine coolant temperature)	°C or °F	Indicate the engine coolant temperature	ECT sensor (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [AJ] ).	2AQ
ECT (Engine coolant temperature)	V	ECT is 20°C {68°F}: 2.9-3.1 V After warm-up: 0.2-1.0 V		2AQ
EQ_RAT11_DSD (Front oxygen sensor)		Idling after warm-up: Approx. 1	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
ETC_ACT (Electronic throttle control actual)	°	Accelerator pedal is released: Approx. 7.4° Accelerator pedal is released: Approx. 74.3°	TP sensor (See THROTTLE POSITION (TP) SENSOR INSPECTION [AJ] ).	2AI, 2AM
ETC_DSD (Electronic throttle control desired)	%	Throttle valve is closed --> open: PID value changes smoothly	Inspect following PIDs: APP1, APP2, ETC ACT TP sensor (See THROTTLE POSITION (TP) SENSOR INSPECTION [AJ] ).	2AI, 2AM
ETC_DSD (Electronic throttle control desired)	°	Accelerator pedal is released: Approx. 0° Accelerator pedal is released: Approx. 74°		2AI, 2AM
EVAPCP (Purge solenoid valve duty value)	%	Ignition switch is ON: 0%	Inspect following PIDs: BARO, ECT, IAT, MAF, O2S11, O2S21, RPM, TP REL	1BF
FAN_DUTY (Fan control signal)	%	ECT is below 100°C {212°F}: 0% ECT is above 100°C {212°F}: 50-100%	Inspect following PIDs: COLP, ECT	1U
FLI (Fuel level)	%
FP (Fuel pump relay)	On/Off	Ignition switch is ON: Off Idling: On Cranking: On	Inspect following PID: RPM Fuel pump relay (See RELAY INSPECTION ).	1V
FUELPW (Fuel injection duration)	Ms	Ignition switch is ON: 0 ms Idling: 1.5-3.0 ms	Inspect following PIDs: ACSW, ALTT V, ECT, IAT, INGEAR, MAF, MAP, O2S11, O2S12, O2S21, O2S22, PSP, RPM, TP REL, VBAT Fuel injector (See FUEL INJECTOR INSPECTION [AJ] ).	2G, 2E, 2J, 2F, 2K 21
FUEL SYS1 (Fuel system status)	OL/CL/OL-Drive/OL-Fault/CL-Fault	Ignition switch is ON: CL Idling after warm-up: CL	Inspect following PIDs: ALTT V, ECT, IAT, INGEAR, MAF, MAP, O2S11, 02S12, O2S21, O2S22, PSP, RPM, TP REL Fuel injector (See FUEL INJECTOR INSPECTION [AJ] ).
FUEL SYS2 (Fuel system status)	OL/CL/OL-Drive/OL-Fault/CL-Fault	Ignition switch is ON: CL Idling after warm-up: CL	Inspect following PIDs: ALTT V, ECT, IAT, INGEAR, MAF, MAP, O2S11, O2S12, O2S21, O2S22, PSP, RPM, TP REL Fuel injector (See FUEL INJECTOR INSPECTION [AJ] ).
GENVDSD (Generator voltage desired)	V	Ignition switch is ON: 0 V Idling, E/L is not operating: Approx. 14.9 V	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
HTR11 (HO2S heater - RF)	On/Off	Idle after warm-up: On and Off	Inspect following PIDs: ECT, MAF, RPM, TP REL	2AW
HTR12 (HO2S heater - RR)	On/Off	Idling: On Engine speed is above 4,000 RPM: Off	Inspect following PIDs: ECT, MAF, RPM, TP REL	2AT
HTR21 (HO2S heater - LF)	On/Off	Idle after warm-up: On and Off	Inspect following PIDs: ECT, MAF, RPM, TP REL	2AS
HTR22 (HO2S heater - LR)	On/Off	Idling: On Engine speed is above 4,000 RPM: Off	Inspect following PIDs: ECT, MAF, RPM, TP REL	2AO
IASV (VAD control solenoid valve)	On/Off	TP opening angle is less than 60% and engine speed is 6,000 RPM or above: On TP opening angle is 60% or above and engine speed is 4,800 RPM or above: On Others: Off	Inspect following PIDs: ECT, RPM, TP REL	1BB
IAT (Intake air temperature)	°C or °F	Indicate the intake-air temperature	IAT sensor (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [AJ] ).	1AT
IAT (Intake air temperature)	V	IAT is 20°C {68°F}: 2.4-2.6 V IAT is 30°C {86°F}: 1.7-1.9 V		1AT
INGEAR (1) (Load/no load condition)	On/Off	Gear is not neutral position and clutch pedal is released: On Gear is neutral position: Off Clutch pedal is depressed: Off	Inspect following PIDs: CPP, CPP/PNP Perform applicable DTC troubleshooting. (See DTC TABLE [AJ] ).	1AB, 2X
IVS (CTP condition)	Idle/Off Idle	CTP: Idle Others: Off Idle	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).	2AI, 2AM
KNOCKR (Knocking retard)	°	Ignition switch is ON: 0° Idling: 0°	KS (See KNOCK SENSOR (KS) INSPECTION [AJ] ).	2AF, 2AC
LDP_EVAPCP (EVAP system leak detection pump detect incorrect purge flow)	MA	Indicate the EVAP control system incorrect purge flow detection value	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
LDP_IDL (EVAP system leak detection pump idle current)	MA	Indicate the EVAP system leak detection pump idle current	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
LDP_MON (EVAP system leak detection pump monitoring current)	MA	Indicate the EVAP system leak detection pump monitoring current	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
LDP_REF (EVAP system leak detection pump reference current)	MA	Indicate the EVAP system leak detection pump reference current	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
LDP_SLDV (EVAP system small leak detection value)	MA	Indicate the EVAP control system small leak detection value	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
LDP_VSL_FV (2) (EVAP system small leak detection value)	MA/sec	Indicate the EVAP control system vary small leak detection value	Perform applicable DTC troubleshooting. (See DTC TABLE [AJ] ).
LDP_VSL_SV (2) (EVAP system small leak detection value)	MA/sec	Indicate the EVAP control system vary small leak detection value	Perform applicable DTC troubleshooting. (See DTC TABLE [AJ] ).
LDP_VSLDV (2) (EVAP system small leak detection value)	MA/sec	Indicate the EVAP control system vary small leak detection value	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
LOAD (Engine load)	%	MTX Idling: Approx. 16.8% Engine speed is 2,500 RPM: Approx. 14.6% ATX Idling: Approx. 17.5% Engine speed is 2,500 RPM: Approx. 15.2%	Inspect following PIDs: ECT, IAT, MAF, MAP, RPM, TP REL
LONGFT1 (Long term fuel trim - RH)	%	Idling: -20-20%	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
LONGFT2 (Long term fuel trim - LH)	%	Idling: -20-20%	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
MAF (Mass airflow)	G/s	MTX Idling: 3.6-3.8 g/s Engine speed is 2,500 RPM: 10.5-11.2 g/s ATX Idling: 3.8-4.0 g/s Engine speed is 2,500 RPM: 10.6-11.4 g/s	MAF sensor 01-40C-32 MASS AIR FLOW (MAF) SENSOR INSPECTION [AJ]).	1AK
MAF (Mass airflow)	V	Idling: Approx. 1.3 V Engine speed is 2,500 RPM: Approx. 1.9 V		1AK
MIL (Malfunction indicator light)	On/Off	Ignition switch is ON: On Idling: Off	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
MIL_DIS (Travelled distance since the MIL illuminated)	Km or mile	No DTC: 0 km {0 mile} DTC detected: Not 0 km {0 mile}	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
NUMKEYS (Number of keys stored in module)		Indicate the number of keys stored in module
O2S11 (HO2S - RF)	V	Idling after warm-up: 0-1.0 V Acceleration: 0.5-1.0 V Deceleration: 0-0.5 V	HO2S (RF) (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [AJ] ).	2AK
O2S12 (HO2S - RR)	V	Ignition switch is ON: 0-1.0 V Idling after warm-up: 0-1.0 V Acceleration: 0.5-1.0 V Deceleration: 0-0.5 V	HO2S (RR) (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [AJ] ).	2AG
O2S21 (HO2S - LF)	V	Idling after warm-up: Approx. 0.6 V	HO2S (LF) (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [AJ] ).	2AL
O2S22 (HO2S - LR)	V	Idling after warm-up: Approx. 0.6 V	HO2S (LR) (See HEATED OXYGEN SENSOR (HO2S) INSPECTION [AJ] ).	2AH
PSP (PSP switch)	High/Low	Steering wheel is in straight ahead position: Low Steering wheel is turned: High	PSP switch (See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION [AJ] ).	2T
RFCFLAG (Readiness Function Code)	Learnt/Not Learnt	RFC exists: Learnt No RFC: Not Learnt	Perform DRIVE MODE 1 (See OBD-II DRIVE MODE [AJ] ).
RO2FT1 (HO2S (RR) fuel trim)		Idling after warm-up: Approx. -0.03-0.03	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
RO2FT2 (HO2S (RL) fuel trim)		Idling after warm-up: Approx. -0.03-0.03	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
RPM (Engine speed)	RPM	Idling (no load): 700-800 RPM	CKP sensor (See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [AJ] ).	2Z, 2Y
SCCS (Cruise control switch)	V	Press ON/OFF: Approx. 0 V Press CALCEL: Approx. 1.2 V Press SET/COAST: Approx. 3.2 V Press RES/ACCEL: Approx. 4.2 V Others: Approx. 5.0 V	Cruise control switch (See CRUISE CONTROL SWITCH INSPECTION [L3, AJ] ).	1AS
SEGRP (EGR valve position)	No. of step	Ignition switch is ON: 0 step Idling: 0 step Cranking: 0-60 steps	Inspect following PIDs: ECT, IAT, MAF, RPM, VSS EGR valve (See EGR VALVE INSPECTION [AJ] ).
SEGRP DSD (Desired EGR valve position)	%	Ignition switch is ON: 0% Idling: 0% Cranking: 0-100%	Inspect following PIDs: ECT, IAT, MAF, RPM, VSS
SHRTFT1 (Short term fuel trim - RH)	%	Idling: -20-20%	Perform applicable DTC troubleshooting. (See DTC TABLE [AJ] ).
SHRTFT11 (Short term fuel trim - RF)	%	Idling: -20-20%	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
SHRTFT12 (Short term fuel trim - LF)	%	Idling: -20-20%	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
SHRTFT2 (Short term fuel trim - LH)	%	Idling: -20-20%	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
SHRTFT21 (Short term fuel trim - RR)	%	Idling: -20-20%	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
SHRTFT22 (Short term fuel trim - LR)	%	Idling: -20-20%	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
SPARKADV (Ignition timing)	° (BTDC)	Ignition switch is ON: 0° (BTDC) Idling: Approx. 10° (BTDC)	Inspect following PIDs: ALTT V, CPP, CPP/PNP, ECT, KNOCKR, MAF, PSP, RPM, TP REL, VSS Perform engine tune-up (See ENGINE TUNE-UP [AJ] ).
Test (Test mode)	On/Off
TIRESIZE (Tire revolution per mile)	Rev/mile	Indicate the tire revolution per a mile
TPREL (Relative throttle position)	%	Throttle valve is closed --> open: PID value changes smoothly	TP sensor (See THROTTLE POSITION (TP) SENSOR INSPECTION [AJ] ).	2AI, 2AM
TP1 (TP sensor No.1 signal voltage)	%	Ignition switch is ON and accelerator pedal not depressed: 13-24% Ignition switch is ON and WOT: Approx. 78%	TP sensor (See THROTTLE POSITION (TP) SENSOR INSPECTION [AJ] ).	2AM
TP1 (TP sensor No.1 signal voltage)	V	Ignition switch is ON and accelerator pedal not depressed: 3.8-4.35 V Ignition switch is ON and WOT: Approx. 1.1 V		2AM
TP2 (TP sensor No.2 signal voltage)	%	Ignition switch is ON and accelerator pedal not depressed: 15-36% Ignition switch is ON and WOT: Approx. 88%	TP sensor (See THROTTLE POSITION (TP) SENSOR INSPECTION [AJ] ).	2AI
TP2 (TP sensor No.2 signal voltage)	V	Ignition switch is ON and accelerator pedal not depressed: 0.75-1.8 V Ignition switch is ON and WOT: Approx. 4.4 V		2AI
TPCT (Relative throttle position)	V	Ignition switch is ON: 0 V	TP sensor (See THROTTLE POSITION (TP) SENSOR INSPECTION [AJ] ).	2AI, 2AM
VPWR (Battery positive voltage)	V	Ignition switch is ON: B+	Battery (See BATTERY INSPECTION [L3, AJ] ).
VSS (Vehicle speed)	KPH or MPH	Vehicle speed is 20 km/h {12 mph}:20 KPH {12MPH} Vehicle speed is 40 km/h {25 mph}: 40 KPH {25 MPH}	Perform applicable DTC troubleshooting (See DTC TABLE [AJ] ).
VT ACT1 (Actual valve timing - RH)	°	Idling: 0°	Inspect following PIDs: ECT, RPM, TP REL OCV(RH) (See OIL CONTROL VALVE (OCV) INSPECTION [AJ] ).	2AE, 2AD
VT ACT2 (Actual valve timing - LH)	°	Idling: 0°	Inspect following PIDs: ECT, RPM, TP REL OCV (LH) (See OIL CONTROL VALVE (OCV) INSPECTION [AJ] ).	2AB, 2AA
VT DIFF1 (Difference between actual and target valve timing - RH)	°	Idling: 0°	Inspect following PIDs: ECT, RPM, TP REL OCV (RH) (See OIL CONTROL VALVE (OCV) INSPECTION [AJ] ).	2AE, 2AD
VT DIFF2 (Difference between actual and target valve timing - LH)	°	Idling: 0°	Inspect following PIDs: ECT, RPM, TP REL OCV(LH) (See OIL CONTROL VALVE (OCV) INSPECTION [AJ] ).	2AB, 2AA
VT DUTY1 (OCV control signal - RH)	%	Idling: 0%	Inspect following PIDs: ECT, RPM, TP REL OCV (RH) (See OIL CONTROL VALVE (OCV) INSPECTION [AJ] ).	2AE, 2AD
VT DUTY2 (OCV control signal - LH)	%	Idling: 0%	Inspect following PIDs: ECT, RPM, TP REL OCV (LH) (See OIL CONTROL VALVE (OCV) INSPECTION [AJ] ).	2AB, 2AA
(1) MTX (2) California emission regulation applicable model

(1)

MTX

(2)	California emission regulation applicable model

PID/DATA MONITOR REFERENCE

ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [AJ]

WARNING

A hot engine can cause severe burns. Turn off the engine and wait until it is cool before removing the ECT sensor.

Disconnect the negative battery cable.
Drain the engine coolant.
Disconnect the ECT sensor connector.
Remove the ECT sensor.
Replace the gasket.
Install in the reverse order of removal.
Refill the engine coolant.

KNOCK SENSOR (KS) REMOVAL/INSTALLATION [AJ]

Disconnect the negative battery cable.
Disconnect the KS connector.
Remove the KS.
Install in the reverse order of removal. Tightening torque 21.2-28.8 N.m {2.17-2.93 kgf.m, 15.7-21.2 ft.lbf}

CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [AJ]

CAUTION

Do not forcefully pull the wiring harness of the CMP sensor. Doing so will break the harness.

Scheme 116

Disconnect the negative battery cable.
Disconnect the CMP sensor connector.
Remove the CMP sensor. CAUTION: When foreign material such as an iron chip is on the CMP sensor, it can cause abnormal output from the sensor because of flux turbulence and adversely affect the engine control. Be sure there is no foreign material on the CMP sensor when replacing.
Install in the reverse order of removal.

CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [AJ]

CAUTION

Do not forcefully pull the wiring harness of the CKP sensor. Doing so will break the harness.

Scheme 117

Disconnect the negative battery cable.
Disconnect the CKP sensor connector.
Remove the CKP sensor. CAUTION: When foreign material such as an iron chip is on the CKP sensor, it can cause abnormal output from the sensor because of flux turbulence and adversely affect the engine control. Be sure there is no foreign material on the CKP sensor when replacing.
Install in the reverse order of removal.

Engine Control System (Aj): Removal & Installation Mazda 6 GH