Engine Control System (L3): Diagnosis Mazda 6 GG рестайлинг

CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [L3]

Note. Perform the following inspection only when directed.

Continuity Inspection

1. Verify that the clutch switch is installed properly.
2. Disconnect the negative battery cable.
3. Remove the clutch switch.
4. Inspect for continuity between the clutch switch terminals using an ohmmeter. If the clutch switch is normal, but PID value is out of specification, perform the "Circuit Open/Short Inspection". If not as specified, replace the clutch switch.

Specification

Scheme 25

Scheme 26

Scheme 27

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following harnesses for open or short circuit. (Continuity inspection)

Scheme 28

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

NEUTRAL SWITCH INSPECTION [L3]

Note. Perform the following inspection only when directed.

1. Disconnect the negative battery cable.
2. Remove the neutral switch. (See «MANUAL TRANSAXLE REMOVAL/INSTALLATION [G35M-R]»(ref-244567-S28118070672006092500000) ).
3. Inspect for continuity between the neutral switch terminals using an ohmmeter. If the neutral switch is normal, but PID value is out of specification, perform the "Circuit Open/Short Inspection". If not as specified, replace the neutral switch.

Specification

Scheme 29

Scheme 30

Scheme 31

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following harnesses for open or short circuit. (Continuity inspection)

POWER STEERING PRESSURE (PSP) SWITCH INSPECTION [L3]

Note. Perform the following inspection only when directed.

1. Inspect the following if the power steering is inoperative (See «POWER STEERING FLUID INSPECTION»(ref-244594-S41752550022006092500000) ). Power steering fluid level Power steering fluid leakage Power steering fluid pressure
2. Disconnect the PSP switch connector.
3. Start the engine.
4. Inspect for continuity between the PSP switch terminal and GND using an ohmmeter. If not as specified, replace the PSP switch. If the PSP switch is normal, but PID value is out of specification, perform the "Circuit Open/Short Inspection".

Specification

Scheme 32

Scheme 33

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following harnesses for open or short circuit. (Continuity inspection)

Scheme 34

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

VARIABLE TUMBLE SHUTTER VALVE SWITCH INSPECTION [L3]

Note. Perform the following inspection only when directed.

Scheme 35

1. Turn the ignition switch to ON position (Engine OFF).
2. Verify that the PCM terminal 2AE voltage is as shown in the following table when the Variable tumble shutter valve actuator rod is depressed and released by hand. If not as specified, perform the "Circuit Open/Short Inspection". If there is no open or short circuit, replace the intake manifold.

Variable tumble shutter valve switch output voltage

PCM TERMINAL CONDITION CHART

Scheme 36

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following harnesses for open or short circuit. (Continuity inspection)

ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION [L3]

Note. Perform the following inspection only when directed.

Voltage Inspection

1. Turn the ignition key to ON position (Engine OFF).
2. Verify that the PCM terminal 1 AO and 1 AP change smoothly while throttle valve is gradually opened. If as verified, go to next step. If not as verified, perform the "Circuit Open/Short Inspection". If there is no open or short circuit, replace the throttle body.
3. Verify that the PCM terminal 1 AO and 1 AP voltages are as shown in the following table. APP sensor output voltage PCM TERMINAL CONDITION CHART Condition PCM terminal 1AO (APP sensor No.1) PCM terminal 1AP (APP sensor No.2) Accelerator pedal released 1.55-1.62 V 1.01-1.07 V Accelerator pedal depressed 3.49-4.09 V 2.94-3.54 V If voltage is not as following table, perform the "Circuit Open/Short Inspection". If there is no open or short circuit, replace accelerator pedal. (See «ACCELERATOR PEDAL REMOVAL/INSTALLATION [L3]»(ref-244570-S04534999862006092500000) ).

Scheme 37

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

THROTTLE POSITION (TP) SENSOR INSPECTION [L3]

Note. Perform the following inspection only when directed.

1. Verify that no DTC related to APP sensor has been detected. If any DTCs related to APP sensor have been detected, perform the DTC inspection. (See «DTC TABLE [L3]»(ref-244554-S15056466722006092500000) ).
2. Start the engine and warm it up (ECT: more than 80°C {176°F}.
3. Turn the ignition switch to ON position (Engine OFF).
4. Verify that the PCM terminal 2AK and 2AL change smoothly while throttle valve is gradually opened. If as verified, go to next step. If not as verified, perform the "Circuit Open/Short Inspection". If there is no open or short circuit, replace the throttle body.
5. Verify that the PCM terminal 2AK and 2AL voltages are as shown in the following table. If voltage is not as following table, perform the "Circuit Open/Short Inspection". If there is no open or short circuit, replace the throttle body.

TP sensor output voltage

PCM TERMINAL CONDITION CHART

Scheme 38

Scheme 39

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

Visual Inspection

Note. Perform the following inspection only when directed.

1. Visually inspect for the following on the MAF sensor. Damage Cracks Bent terminals Terminal rust If any of the above are found, replace the MAF sensor. If the MAF PID value is out of specification, carry out the "Circuit Open/Short Inspection".

Scheme 40

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Disconnect the MAF sensor connector.
3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

Resistance Inspection

Note. Perform the following inspection only when directed.

1. Disconnect MAF/IAT sensor.
2. Measure the resistance between the MAF/IAT sensor terminals D and E using an ohmmeter. If not as specified, replace the MAF/IAT sensor. If the MAF/IAT sensor is normal, but PID are out of specification, perform the "Circuit Open/Short Inspection".

Specification

AMBIENT TEMPERATURE RESISTANCE CHART

Scheme 41

Scheme 42

Scheme 43

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following wiring harnesses for open or short circuit. (Continuity, inspection)

ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [L3]

Note. Perform the following inspection only when directed.

ECT Sensor Resistance Inspection

1. Drain the engine coolant. (See «COOLING SYSTEM SERVICE WARNINGS [L3, AJ]»(ref-244562-S18278447982006092500000) ).
2. Remove the ECT sensor (located above the starter).
3. Place the ECT sensor in water with a thermometer, and heat the water gradually.
4. Measure the resistance between the ECT sensor terminals A and B using an ohmmeter. If not as specified, replace the ECT sensor. If the ECT sensor is normal, but PID value is out of specification, perform the "Circuit Open/Short Inspection".

Specification

WATER TEMPERATURE RESISTANCE CHART

Scheme 44

Scheme 45

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [L3]

Note. Perform the following inspection only when directed. The following vacuum values are indicated by relative pressure from the MAP sensor.

1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to ON (Engine OFF).
3. Select MAP PID on the WDS or equivalent.
4. Verify that the MAP PID (pressure) and barometric pressure are practically equal. If not as verified, perform the "Circuit Open/Short Inspection". If there is no open or short circuit, replace the MAP sensor. If as verified, go to next step.
5. Apply vacuum of -25.0 kPa {-187 mmHg, -7.38 inHg} to the MAP sensor, and verify that the MAP variation from that of Step 4 is approx. 25.0 kPa {187 mmHg, 7.38 inHg} . If not as verified, perform the "Circuit Open/Short inspection". If there is no open or short circuit, replace the barometric pressure sensor.

Scheme 46

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [L3]

Note. Perform the following inspection according to the DATA MONITOR function (indicated by monitor item from here onwards).

Air Gap Inspection

1. Verify that the CKP sensor is securely installed.
2. Using a thickness gauge, measure the air gap between the plate projections at the back of crankshaft pulley and the CKP sensor. If not within the specification, inspect the plate projections for cracks or bending. If there is any malfunction, replace the plate. If the monitor item condition/specification (reference) is not within the specification, even though there is no malfunction, carry out the "Circuit Open/Short Inspection". Air gap 0.5-1.5 mm {0.02-0.05 in}

1. Disconnect the negative battery cable.
2. Remove the CKP sensor. (See «CRANKSHAFT POSITION (CKP) SENSOR INSPECTION [L3]»(ref-244558-S36813084342006092500000) ).
3. Verify that there are no metal shavings on the sensor. If the monitor item condition/specification (reference) is without the specification even though there is no malfunction, carry out the "Circuit Open/Short Inspection".

Scheme 47

1. Idle the engine. CAUTION: Water penetrating the connector will cause sensor malfunction. To prevent this, be careful not to damage the wiring harnesses or the waterproof connector so as to cause water penetration.
2. Measure the output voltage using a oscilloscope. If not within the specification, replace the CKP sensor. If the monitor item condition/specification (reference) is without the specification, even though the voltage is within the specification, carry out the "Circuit Open/Short Inspection".

TERMINAL VOLTAGE CONDITION CHART

Scheme 48

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

CAMSHAFT POSITION (CMP) SENSOR INSPECTION [L3]

Note. Perform the following inspection according to the DATA MONITOR function (indicated by monitor item from here onwards).

1. Disconnect the negative battery cable.
2. Remove the CMP sensor. (See «CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [L3]»(ref-244558-S28108681122006092500000) ).
3. Verify that there are no metal shavings on the sensor. If the monitor item condition/specification (reference) is not within the specification even though there is no malfunction, carry out the "Circuit Open/Short Inspection".

Scheme 49

1. Idle the engine. CAUTION: Water penetrating the connector will cause sensor malfunction. To prevent this, be careful not to damage the wiring harnesses or the waterproof connector so as to cause water penetration.
2. Measure the output voltage using a oscilloscope. If not within the specification, replace the CMP sensor. If the monitor item condition/specification (reference) is not within the specification, even though the voltage is within the specification, carry out the "Circuit Open/Short Inspection".

TERMINAL VOLTAGE CONDITION CHART

Scheme 50

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

KNOCK SENSOR (KS) INSPECTION [L3]

Note. Perform the following test only when directed.

1. Turn the ignition switch to LOCK.
2. Disconnect the KS connector.
3. Measure the resistance between the KS terminals A and B using an ohmmeter. If not as specified, replace the KS. If the KS is normal, but PID value is out of specification, perform the "Circuit Open/Short Inspection". Specification Approx. 4.87 megohms

Scheme 51

1. Disconnect the PCM connector. (See «PCM REMOVAL/INSTALLATION [L3]»(ref-244558-S14017244512006092500000) ).
2. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

BAROMETRIC PRESSURE (BARO) SENSOR INSPECTION [L3 (VEHICLES EQUIPPED WITH BARO SENSOR BUILT INTO PCM)]

Note. Perform the following inspection only when directed. The following vacuum values are indicated by relative pressure from the PCM. (See PCM REMOVAL/INSTALLATION [L3] ).

1. Connect the WDS or equivalent to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Select BARO on the WDS or equivalent.
4. Verify that the BARO PID (pressure) and barometric pressure are practically equal. If not as verified, perform the "Circuit Open/Short Inspection". If there is no open or short circuit, replace the PCM.