Engine Control System: Other Mazda CX-7 I facelift

PCM Connector Connection Note

Scheme 50

Scheme 51

Scheme 52

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

Without 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.

PCM terminals

1. 1AE (+)-body ground (-)

Oscilloscope setting

1. 5 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

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

Scheme 53

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

1. 2 V/DIV (Y), 20 ms/DIV (X), DC range

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

Scheme 54

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

1. 2 V/DIV (Y), 100 ms/DIV (X), DC range

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

Scheme 55

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

1. 2 V/DIV (Y), 5 ms/DIV (X), DC range

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

Scheme 56

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

1. 20 V/DIV (Y), 20 ms/DIV (X), DC range

1. Ignition switch to the ON position

Scheme 57

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

1. 10 V/DIV (Y), 20 ms/DIV (X), DC range

1. Engine speed is 2,000 rpm

Scheme 58

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

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

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

Scheme 59

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

1. 0.5 V/DIV (Y), 2 ms/DIV (X), DC range

1. Idle after warm up (engine speed approx. 650 rpm, no load)

Scheme 60

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

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

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

Scheme 61

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

1. 2 V/DIV (Y), 20 ms/DIV (X), DC range

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

Scheme 62

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. 10 V/DIV (Y), 20 ms/DIV (X), DC range

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

Scheme 63

1. Fuel injection No. 1, No. 4: 2BG (+)-body ground (-)
2. Fuel injection No. 2, No. 3: 2BH (+)-body ground (-)

1. 20 V/DIV (Y), 400 us/DIV (X), DC range

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

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 WITH TC] .) Main relay

1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Measure the PID value. If PID value is not within the specification, follow the instructions in the "Inspection item" 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, FAN_DUTY1, EVAPCP, FP, FUELPW1, GENVDSD, HTR11, HTR12, IMRC, INJ_1, INJ_2, INJ_3, INJ_4, SEGRP, test, VT DUTY1 Wt, WGC

PID/DATA MONITOR TABLE (REFERENCE)

PCM CONFIGURATION [L3 WITH TC]

1. Connect the M-MDS to 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 DTC's using the M-MDS, then verify that no DTC is present. If a DTC is detected, perform the applicable DTC inspection. (See «DTC TABLE [L3 WITH TC]»(ref-343763-S21425878652009101500000) .)

Open circuit

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. PSP switch terminal and PCM terminal 2T

Short circuit

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

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. Variable swirl shutter valve switch terminal A and PCM terminal 2AE Variable swirl shutter valve switch terminal B and body ground.

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

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 ground 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/IAT sensor terminal A and main relay terminal E MAF/IAT sensor terminal B and PCM terminal 1P MAF/IAT sensor terminal C and PCM terminal 1AK

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

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 1M 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 ground

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

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

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. MAP/boost air temperature sensor terminal A and PCM terminal 2AV MAP/boost air temperature sensor terminal B and PCM terminal 2N MAP/boost air temperature sensor terminal C and PCM terminal 2AU

1. If there is continuity, there is a short circuit. Repair or replace the wiring harness. MAP/boost air temperature sensor terminal A and power supply MAP/boost air temperature sensor terminal B and power supply MAP/boost air temperature sensor terminal B and body ground MAP/boost air temperature sensor terminal C and body ground

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 ground Throttle body terminal B and body ground Throttle body terminal C and power supply Throttle body terminal C and body ground 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 1AC APP sensor terminal D and PCM terminal 1Q APP sensor terminal E and PCM terminal 1U APP sensor terminal F and PCM terminal 1Y

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

1. If there is no continuity, there is an open circuit. Repair or replace the wiring harness. Fuel pressure sensor terminal A and PCM terminal 2P Fuel pressure sensor terminal B and PCM terminal 2R Fuel pressure sensor terminal C and PCM terminal 2I

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

1. If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness. A/F sensor terminal 1A and PCM terminal 2AD A/F sensor terminal 1B and PCM terminal 2AC A/F sensor terminal 1C and PCM terminal 2Z A/F sensor terminal 2A and PCM terminal 2M A/F sensor terminal 2B and main relay terminal E A/F sensor terminal 2C and PCM terminal 2Y A/F sensor terminal 2D and PCM terminal 2C

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

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) 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 HO2S outputs a voltage of 0.6 V or more, one time or more, then verify that the 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 «HO2S CIRCUIT OPEN/SHORT INSPECTION»(ref-343775-S13717618402009101500000) ).) Then if there is no malfunction in the wiring harness, replace the HO2S.

Scheme 65

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. HO2S terminal A and PCM terminal 2Q HO2S terminal B and PCM terminal 1BC

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

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

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

1. If there is no continuity, the circuit is open. Repair or replace the wiring harness. CKP sensor terminal A and PCM terminal 2P CKP sensor terminal B and PCM terminal 2W CKP sensor terminal C and main relay terminal E

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

1. If there is no continuity, the circuit is open. Repair or replace the wiring harness. CMP sensor terminal A and main relay terminal E CMP sensor terminal B and PCM terminal 2P CMP sensor terminal C and PCM terminal 2S

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

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 ground KS terminal B and power supply KS terminal B and body ground