Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 2010 >> CX-7 FWD L4-2.5L >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Testing and Inspection >> Component Tests and General Diagnostics

Component Tests and General Diagnostics




PCM INSPECTION [L5]

Using 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 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 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, EVAPCV, FAN_DUTY, FP, IMRC, IMTV, INJ_1~4, SEGRP, TEST, VT Duty1 wt
PID/DATA monitor table (reference)

PID/DATA Monitor Table (Reference) (Part 1):





PID/DATA Monitor Table (Reference) (Part 2):





PID/DATA Monitor Table (Reference) (Part 3):





PID/DATA Monitor Table (Reference) (Part 4):





PID/DATA Monitor Table (Reference) (Part 5):





PID/DATA Monitor Table (Reference) (Part 6):





PID/DATA Monitor Table (Reference) (Part 7):





*1
Calculated value; differs from terminal voltage
*2
With cruise control system

- Following PIDs are for the ATX models. If inspects for following PIDs, FS5A -EL

Without Using the M-MDS

CAUTION:
- The PCM terminal voltages vary with change in measuring conditions and vehicle conditions. Always carry out a total inspection of the input systems, output systems, and PCM to determine the cause of trouble. Otherwise, a wrong diagnosis will be made.

PCM inspection preparation

1. Disconnect the negative battery cable.

2. Remove the battery and battery tray. Removal and Replacement

3. Remove the windshield wiper arm and blade. (See Windshield Wiper Arm and Blade Removal/Installation.)

4. Remove the cowl grille. (See Cowl Grille Removal/Installation.)

5. Remove the windshield wiper motor. (See Windshield Washer Motor Removal/Installation.)

6. Remove the cowl panel. (See Cowl Panel Removal/Installation.)

7. Remove the PCM bracket with the PCM connector still connected. (See Service and Repair.)

8. Install the battery and battery tray. Removal and Replacement

9. Connect the negative battery cable.

Terminal voltage table (Reference)





Terminal Voltage Table (Reference) (Part 1):





Terminal Voltage Table (Reference) (Part 2):





Terminal Voltage Table (Reference) (Part 3):





Terminal Voltage Table (Reference) (Part 4):





Terminal Voltage Table (Reference) (Part 5):





Terminal Voltage Table (Reference) (Part 6):





Terminal Voltage Table (Reference) (Part 7):





Terminal Voltage Table (Reference) (Part 8):





*1
With cruise control system

Inspection Using An Oscilloscope (Reference)

Cooling fan control





PCM terminals
- 1R(+)-body ground(-)

Oscilloscope setting
- 5 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up

APP sensor No.2 signal

Accelerator pedal released





Accelerator pedal depressed






PCM terminals
- 1AO(+)-body ground(-)

Oscilloscope setting
- 2.5 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition
- Turn the ignition switch to the ON position.

Purge control





PCM terminals
- 1BA(+)-body ground(-)

Oscilloscope setting
- 10 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up

A/F sensor heater control





PCM terminals
- 2A(+)-body ground(-)

Oscilloscope setting
- 5 V/DIV (Y), 200 ms/DIV (X), DC range

Vehicle condition
- Idle (immediately after starting the engine)

HO2S heater control





PCM terminals
- 2B(+)-body ground(-)

Oscilloscope setting
- 5 V/DIV (Y), 1 s/DIV (X), DC range

Vehicle condition
- Idle (immediately after starting the engine)

OCV control signal





PCM terminals
- 2E(+)-body ground(-)

Oscilloscope setting
- 2 V/DIV (Y), 0.8 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up

IGT1, IGT2, IGT3, IGT4 control





PCM terminals
- IGT1(ignition coil No.1): 2G(+)-body ground(-)
- IGT2(ignition coil No.2): 2K(+)-body ground(-)
- IGT3(ignition coil No.3): 2L(+)-body ground(-)
- IGT4(ignition coil No.4): 2H(+)-body ground(-)

Oscilloscope setting
- 1 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up

CMP signal





PCM terminals
- 2S(+)-body ground(-)

Oscilloscope setting
- 1 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up

CKP signal





PCM terminals
- 2W(+)-body ground(-)

Oscilloscope setting
- 1 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up

Generator field coil control





PCM terminals
- 2AA(+)-body ground(-)

Oscilloscope setting
- 0.5 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up

Generator output voltage





PCM terminals
- 2AF(+)-body ground(-)

Oscilloscope setting
- 2 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up

Fuel injection (#1, #2, #3, #4) control





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

Oscilloscope setting
- 10 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up

pro multis · About Operation CHARM