Engine Control System (L3): Other Mazda 6 GH

CONTROL SYSTEM DIAGRAM [L3]

California emission regulation applicable ATX model

Scheme 36

Except for California emission regulation applicable ATX model

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Using the M-MDS

Note. PIDs for the following parts are not available on this model. Perform the specific inspections for the following parts: CMP sensor (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [L3] ). Main relay (See RELAY INSPECTION ).

Scheme 42

1. Connect the 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 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, EVAPCP, FAN1, FAN2, FAN3, FP, FUELPW1, GENVDSD, HTR11, HTR12, HTR13 * , IASV, IMRC, IMTV, INJ_1, INJ_2, INJ_3, INJ_4, SEGRP, test, VT DUTY1 Wt * : California emission regulation applicable ATX model

PID/DATA MONITOR CHART

Without Using the SST

Scheme 43

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)

PCM REFERENCE CHART

PCM terminals

1. 10, 2M, 2N(+)-body ground(-)

Oscilloscope setting

1. 1 V/DIV (Y), 10 ms/DIV (X), DC range

Scheme 44

1. Drive the vehicle with approx. 10 km/h {6.2 mph}

1. 2C(+)-body ground(-)

1. 2 V/DIV (Y), 10 ms/DIV (X), DC range

Scheme 45

1. Idle after warm up (no load, P/S off, A/C off)

1. 2E(+)--body ground(-)

1. 2 V/DIV (Y), 0.8 ms/DIV (X), DC range

Scheme 46

1. Idle after warm up (no load, P/S off, A/C off)

1. 2S(+)-body ground(-)

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

Scheme 47

1. Idle after warm up (no load, P/S off, A/C off)

1. 2W(+)--body ground(-)

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

Scheme 48

1. Idle after warm up (no load, P/S off, A/C off)

1. 2AD(+)-body ground(-)

1. 0.1 V/DIV (Y), 400 ms/DIV (X), DC range

Scheme 49

1. Idle after warm up (no load, P/S off, A/C off)

1. 2AI(+)-body ground(-)

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

Scheme 50

1. Idle after warm up (no load, P/S off, A/C off)

1. 2AJ(+)-body ground(-)

1. 2 V/DIV (Y), 2 ms/DIV (X), DC range

Scheme 51

1. Idle after warm up (no load, P/S off, A/C off)

1. IGT1 (ignition coil No.1): 2BA(+)-body ground(-)
2. IGT2 (ignition coil No.2): 2AW(+)-body ground(-)
3. IGT3 (ignition coil No.3): 2AX(+)-body ground(-)
4. IGT4 (ignition coil No.4): 2AT(+)-body ground(-)

1. 4 V/DIV (Y), 0.01 ms/DIV (X), DC range

Scheme 52

1. Idle after warm up (no load, P/S off, A/C off)

1. Fuel Injection No.1: 2BB(+)-body ground(-)
2. Fuel Injection No.2: 2BC(+)-body ground(-)
3. Fuel Injection No.3: 2BD(+)-body ground(-)
4. Fuel Injection No.4: 2AZ(+)-body ground(-)

1. 4 V/DIV (Y), 10 ms/DIV (X), DC range

Scheme 53

1. Idle after warm up (no load, P/S off, A/C off)

1. 2BE(+)-body ground(-)

1. 2 V/DIV (Y), 1 s/DIV (X), DC range

Scheme 54

1. Idle (immediately after starting the engine)

1. 2BG(+)-body ground(-)

1. 2 V/DIV (Y), 500 ms/DIV (X), DC range

Scheme 55

1. Idle (immediately after starting the engine)

PCM CONFIGURATION [L3]

1. Connect the M-MDS to the DLC-2.
2. After the vehicle is identified, select the following items from the initial screen of the M-MDS. When using the IDS (laptop PC) Select the "Module Programming". When using the PDS (Pocket PC) Select "Programming". Select "Module Programming".
3. Then, select the "Programmable Module Installation", "PCM" from the screen menu.
4. Select "PCM" and perform procedures according to directions on the M-MDS screen.
5. Retrieve DTCs by the M-MDS, then verify that there is no DTC present. If a DTC is present, perform the applicable DTC inspection.

Short circuit

1. If there is no continuity, there is a short circuit. Repair or replace the harness. Neutral switch terminal B and body GND

Open circuit

1. If there is no continuity, there is an open circuit. Repair or replace the harness. Clutch switch terminal B and PCM terminal 1D Clutch switch terminal D and body GND

1. If there is continuity, there is a short circuit. Repair or replace the harness. Clutch switch terminal B and body GND

1. If there is no continuity, there is a short circuit. Repair or replace the harness. PSP switch terminal and body GND

1. If there is no continuity, there is an open circuit. Repair or replace the harness. Variable tumble shutter valve switch terminal A and PCM terminal 2AU Variable tumble shutter valve switch terminal B and PCM terminal 2AY Variable tumble shutter valve switch terminal C and PCM terminal 2AE

1. If there is continuity, there is a short circuit. Repair or replace the harness. Variable tumble shutter valve switch terminal A and power supply Variable tumble shutter valve switch terminal A and body GND Variable tumble shutter valve switch terminal B and power supply Variable tumble shutter valve switch terminal C and power supply Variable tumble shutter valve switch terminal C and body GND

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. ECT sensor terminal A and PCM terminal 2AH ECT sensor terminal B and PCM terminal 2AY

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. ECT sensor terminal A and power supply ECT sensor terminal A and body GND ECT sensor terminal B and power supply

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. MAF sensor terminal A and main relay terminal C MAF sensor terminal B and PCM terminal 1P MAF sensor terminal C and PCM terminal 1AK

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. MAF sensor terminal A and body GND MAF sensor terminal B and power supply MAF sensor terminal C and power supply MAF sensor terminal C and body GND

Specification

INTAKE MAF TERMINAL CONDITION CHART

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. MAF/IAT sensor terminal D and PCM terminal 1AT MAF/IAT sensor terminal E and PCM terminal 1AR

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. MAF/IAT sensor terminal E and power supply MAF/IAT sensor terminal D and power supply MAF/IAT sensor terminal D and body GND

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. MAP sensor terminal A and PCM terminal 2AY MAP sensor terminal D and PCM terminal 2AG MAP sensor terminal C and PCM terminal 2AU

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. MAP sensor terminal A and power supply. MAP sensor terminal C and power supply. MAP sensor terminal C and body GND. MAP sensor terminal D and power supply. MAP sensor terminal D and body GND

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. Throttle body terminal A and PCM terminal 2AK Throttle body terminal B and PCM terminal 2AO Throttle body terminal C and PCM terminal 2AL Throttle body terminal D and PCM terminal 2AP

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. Throttle body terminal A and power supply Throttle body terminal A and body GND Throttle body terminal B and power supply Throttle body terminal B and body GND Throttle body terminal C and power supply Throttle body terminal C and body GND Throttle body terminal D and power supply

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. APP sensor terminal A and PCM terminal 1AJ APP sensor terminal B and PCM terminal 1AV APP sensor terminal C and PCM terminal 1AP APP sensor terminal D and PCM terminal 1AL APP sensor terminal E and PCM terminal 1AS APP sensor terminal F and PCM terminal 1AO

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. APP sensor terminal A and power supply APP sensor terminal A and body GND APP sensor terminal B and power supply APP sensor terminal C and power supply APP sensor terminal C and body GND APP sensor terminal D and power supply APP sensor terminal D and body GND APP sensor terminal E and power supply APP sensor terminal F and power supply APP sensor terminal F and body GND

California Emission Regulation Applicable ATX Model

Note. Before performing the following inspection, make sure to follow the troubleshooting flowchart. (See FOREWORD [L3] ).

Scheme 56

1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following: Vehicle speed (PID: VSS) Engine speed (PID: RPM) Front HO2S current (PID: O2S11)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 RPM or more.
4. Verify that the front HO2S current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the figure. If not within the specification, inspect the HO2S for an open or short circuit. (See «FRONT HO2S CIRCUIT OPEN/SHORT INSPECTION (SENSOR)»(ref-288753-S25770563782008062500000) ). Then if there is no malfunction in the wiring harness, replace the front HO2S.

Scheme 57

1. Disconnect the front HO2S connector.
2. Measure the resistance between front HO2S terminals C and D. If not within the specification, replace the front HO2S. (See «EXHAUST SYSTEM REMOVAL/INSTALLATION [L3]»(ref-288809-S21869779132008062500000) ). Front HO2S heater resistance 1-10 ohms

Scheme 58

1. Disconnect the PCM connector.
2. Disconnect the front HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. Front HO2S terminal A and PCM terminal 2AD Front HO2S terminal B and PCM terminal 2Z Front HO2S terminal C and PCM terminal 2BG Front HO2S terminal D and ignition switch

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. Front HO2S terminal A and body ground Front HO2S terminal A and power supply Front HO2S terminal B and body ground Front HO2S terminal B and power supply Front HO2S terminal D and body ground

Scheme 59

1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following: Vehicle speed (PID: VSS) Engine speed (PID: RPM) Middle/rear HO2S voltage (PID: O2S12/O2S13)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 RPM or more.
4. Verify that the middle/rear HO2S outputs a voltage of 0.6 V or more , one time or more, then verify that the middle/rear HO2S voltage (PID: O2S12/O2S13) is 0.3 V or less while decelerating as shown in the figure. If not within the specification, inspect the HO2S for an open or short circuit. (See «MIDDLE/REAR HO2S CIRCUIT OPEN/SHORT INSPECTION (SENSOR)»(ref-288753-S39508852512008062500000) ). Then if there is no malfunction in the wiring harness, replace the middle/rear HO2S.

Scheme 60

Scheme 61

1. Disconnect the PCM connector.
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. Middle HO2S terminal A and PCM terminal 2R Middle HO2S terminal B and PCM terminal 1BG Rear HO2S terminal A and PCM terminal 2Q Rear HO2S terminal B and PCM terminal 1BC

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. Middle/rear HO2S terminal A and body GND Middle/rear HO2S terminal A and power supply Middle/rear HO2S terminal B and power supply

Scheme 62

1. Disconnect the middle/rear HO2S connector.
2. Measure the middle/rear HO2S resistance between terminals C and D. If not within the specification, replace the HO2S. Middle/rear HO2S heater resistance 2-50 ohms

Scheme 63

1. Disconnect the PCM connector.
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. Middle HO2S terminal C and ignition switch Middle HO2S terminal D and PCM terminal 2BF Rear HO2S terminal C and ignition switch Rear HO2S terminal D and PCM terminal 2BE

1. If there is no continuity, there is a short circuit. Repair or replace the wiring harness. Middle and rear Middle/rear HO2S terminal C and body GND Middle/rear HO2S terminal D and power supply Middle/rear HO2S terminal D and body GND

Except for California Emission Regulation Applicable ATX Model

Note. Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart.

Scheme 64

1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following: Vehicle speed (PID: VSS) Engine speed (PID: RPM) Front HO2S current (PID: O2S11)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 RPM or more .
4. Verify that the front HO2S current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the figure. If not within the specification, inspect the HO2S for an open or short circuit. (See «FRONT HO2S CIRCUIT OPEN/SHORT INSPECTION (SENSOR)»(ref-288753-S25770563782008062500000) ). Then if there is no malfunction in the wiring harness, replace the front HO2S.

Scheme 65

1. Disconnect the front HO2S connector.
2. Measure the resistance between front HO2S terminals 2B and 2D. If not within the specification, replace the front HO2S. (See «EXHAUST SYSTEM REMOVAL/INSTALLATION [L3]»(ref-288809-S21869779132008062500000) ). Front HO2S heater resistance 1-10 ohms

Scheme 66

Scheme 67

1. Disconnect the PCM connector.
2. Disconnect the front HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. Front HO2S terminal 1A and PCM terminal 2AD Front HO2S terminal 1B and PCM terminal 2AC Front HO2S terminal 1C and PCM terminal 2Z Front HO2S terminal 2B and main relay terminal C Front HO2S terminal 2D and PCM terminal 2BG

1. If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness. Front HO2S terminal 1A and body ground Front HO2S terminal 1A and power supply Front HO2S terminal 1B and body ground Front HO2S terminal 1B and power supply Front HO2S terminal 1C and body ground Front HO2S terminal 1C and power supply Front HO2S terminal 2B and body ground Front HO2S terminal 2B and power supply Front HO2S terminal 2D and body ground Front HO2S terminal 2D and power supply

Scheme 68

1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following: Vehicle speed (PID: VSS) Engine speed (PID: RPM) Rear HO2S voltage (PID: O2S12)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 RPM or more.
4. Verify that the rear HO2S outputs a voltage of 0.6 V or more, one time or more, then verify that the rear HO2S voltage (PID: O2S12) is 0.3 V or less while decelerating as shown in the figure. If not within the specification, inspect the HO2S for an open or short circuit. (See «REAR HO2S CIRCUIT OPEN/SHORT INSPECTION (SENSOR)»(ref-288753-S36235629312008062500000) ). Then if there is no malfunction in the wiring harness, replace the rear HO2S.

Scheme 69

Scheme 70

1. Disconnect the PCM connector.
2. Disconnect the rear HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. Rear HO2S terminal A and PCM terminal 2Q Rear HO2S terminal Band PCM terminal 1BC

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. Rear HO2S terminal A and body ground Rear HO2S terminal A and power supply Rear HO2S terminal B and power supply

Scheme 71

1. Disconnect the rear HO2S connector.
2. Measure the rear HO2S resistance between terminals C and D. If not within the specification, replace the HO2S. Rear HO2S heater resistance 2-50 ohms

Scheme 72

1. Disconnect the PCM connector.
2. Disconnect the rear HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. Rear HO2S terminal C and ignition switch Rear HO2S terminal D and PCM terminal 2BE

1. If there is no continuity, there is a short circuit. Repair or replace the wiring harness. Rear Rear HO2S terminal C and body ground Rear HO2S terminal D and power supply Rear HO2S terminal D and body ground

1. If there is no continuity, the circuit is open. Repair or replace the wiring harness. CKP sensor terminal A and body ground CKP sensor terminal B and PCM terminal 2W CKP sensor terminal C and PCM terminal 2AQ

1. If there is continuity, the circuit is shorted. Repair or replace the wiring harness. CKP sensor terminal A and power supply CKP sensor terminal B and power supply CKP sensor terminal B and body ground CKP sensor terminal C and body ground

Scheme 73

1. Remove the battery cover.
2. Disconnect the negative battery cable.
3. Remove the plug hole cover. CAUTION: When replacing the CMP sensor, make sure there is no foreign material on it such as metal shavings. If it is installed with foreign material, the sensor output signal will malfunction resulting from fluctuation in magnetic flux and cause a deterioration in engine control.
4. Disconnect the CMP sensor connector.
5. Remove the CMP sensor installation bolt.
6. Remove the CMP sensor from the cylinder head cover.
7. Install in the reverse order of removal. Tightening torque 5.5-7.5 N.m {56-76 kgf.cm, 49-66 in.lbf}

1. If there is no continuity, the circuit is open. Repair or replace the wiring harness. CMP sensor terminal A and body ground CMP sensor terminal B and PCM terminal 2S CMP sensor terminal C and PCM terminal 2AM

1. If there is continuity, the circuit is shorted. Repair or replace the wiring harness. CMP sensor terminal A and power supply CMP sensor terminal B and power supply CMP sensor terminal B and body ground CMP sensor terminal C and power supply

Scheme 74

1. Remove the intake manifold. (See «INTAKE AIR SYSTEM REMOVAL/INSTALLATION [L3]»(ref-288764-S40241065462008062500000) ).
2. Remove the KS attachment bolt to remove the KS.
3. Install in the reverse order of removal. Tightening torque 16.2-23.8 N.m {1.66-2.42 kgf.m, 12.0-17.5 ft.lbf}

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. KS terminal A and PCM terminal 2U KS terminal B and PCM terminal 2V

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. KS terminal A and power supply KS terminal A and body GND KS terminal B and power supply KS terminal B and body GND