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Mazda CX 7. Manual - part 42

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–123

01-02

End Of Sie

INSPECT KNOCK SENSOR

• Perform the knock sensor inspection.

(See01-40-47 KNOCK SENSOR (KS)
INSPECTION[L3 WITH TC])

• Is the knock sensor normal?

Yes

Go to the next step.

Replace the knock sensor, then go to the next step.

INSPECT KNOCK SENSOR CIRCUITS FOR
OPEN CIRCUIT

• Disconnect the knock sensor connector.

• Inspect the continuity between the following

circuits:

— Knock sensor female terminal A (harness-

side) and PCM terminal 2U (harness-side)

— Knock sensor female terminal B (harness-

side) and PCM terminal 2V (harness-side)

• Is there continuity?

Yes

Go to the next step.

Repair or replace the suspected wiring harness, then go to
Step 9.

INSPECT KNOCK SENSOR CIRCUITS FOR
SHORT TO GROUND

• Inspect the continuity between the following

circuits:
— Knock sensor female terminal A (harness-

side) and body ground

— Knock sensor female terminal B (harness-

side) and body ground

• Is there continuity?

Yes

Repair or replace the suspected wiring harness, then go to
Step 9.

Go to the next step.

INSPECT FOR SHORT CIRCUITS

• Inspect for continuity between knock sensor

female terminals A and B (harness-side).

• Is there continuity?

Yes

Repair or replace the suspected wiring harness, then go to
Step 9.

Go to the next step.

INSPECT PCM CONNECTOR TERMINAL FOR
POOR CONNECTION

• Turn the ignition switch off.

• Disconnect the PCM connector.

• Inspect for poor connection at terminals 2V and

2U (such as damaged, pulled-out pins,
corrosion).

• Is there any malfunction?

Yes

Repair the terminal, then go to the next step.

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC P0327
COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Turn ignition switch to the ON position (Engine

off).

• Clear the DTC from the PCM memory using

the M-MDS.

• Start the engine and warm it up completely.

• Is the same DTC present?

Yes

Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)

Troubleshooting completed.

STEP

INSPECTION

ACTION

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–124

DTC P0328[L3 WITH TC]

id010239806800

DTC P0328

Knock sensor circuit high input

DETECTION

CONDITION

• PCM monitors the input signal from the knock sensor when the engine is running. If the input voltage at the

PCM terminals between 2V and 2U is below 4.9 V, the PCM determines that the knock sensor circuit has
a malfunction.

Diagnostic support note

• This is a continuous monitor (CCM).

• MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE

CAUSE

• Knock sensor malfunction

• Connector or terminal malfunction

• Short to the power supply in the wiring harness between knock sensor terminal A and PCM terminal 2U

• Short to the power supply in the wiring harness between knock sensor terminal B and PCM terminal 2V

• PCM malfunction

PCM

KNOCK SENSOR

WIRING HARNESS SIDE CONNECTOR

PCM

WIRING HARNESS SIDE CONNECTOR

2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M

2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P

2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–125

01-02

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED

• Has the FREEZE FRAME DATA been

recorded?

Yes

Go to the next step.

Record FREEZE FRAME DATA on the repair order, then go
to the next step.

VERIFY RELATED REPAIR INFORMATION
AVAILABILITY

• Check for related Service Bulletins and/or on-

line repair information availability.

• Is any related repair information available?

Yes

Perform the repair or diagnosis according to the available
repair information.

• If the vehicle is not repaired, go to the next step.

Go to the next step.

INSPECT KNOCK SENSOR CONNECTOR
TERMINAL FOR POOR CONNECTION

• Turn the ignition switch off.

• Disconnect the knock sensor connector.

• Inspect for poor connection at terminals A and

B (such as damaged, pulled-out pins,
corrosion).

• Is there any malfunction?

Yes

Repair terminal, then go to step 7.

Go to the next step.

INSPECT KNOCK SENSOR

• Perform the knock sensor inspection.

(See01-40-47 KNOCK SENSOR (KS)
INSPECTION[L3 WITH TC])

• Is the knock sensor normal?

Yes

Go to the next step.

Replace the knock sensor, then go to step 7.

INSPECT KNOCK SIGNAL CIRCUIT FOR
SHORT TO POWER SUPPLY

• Turn ignition switch to the ON position (Engine

off).

• Measure the voltage between knock sensor

terminal A (harness-side) and body ground and
knock sensor terminal B (harness-side) and
body ground.

• Is there any voltage?

Yes

Repair or replace the wiring harness for a short to the
power supply, then go to step 7.

Go to the next step.

INSPECT PCM CONNECTOR FOR POOR
CONNECTION

• Disconnect the PCM connector.

• Inspect for poor connection (such as damaged/

pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to the next step.

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC P0328
COMPLETED

• Make sure to connect all disconnected

connectors.

• Turn ignition switch to the ON position (Engine

off).

• Clear the DTC from the PCM memory using

the M-MDS.

• Start the engine and warm it up completely.

• Is same DTC present?

Yes

Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)

Go to the next step.

VERIFY AFTER REPAIR PROCEDURE

• Perform the “After Repair Procedure”.

(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)

Troubleshooting completed.

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–126

DTC P0335[L3 WITH TC]

id010239806900

DTC P0335

CKP sensor circuit malfunction

DETECTION

CONDITION

• If the PCM does not receive the input voltage from the CKP sensor for 4.2 s while the MAF is 2.0 g/s {0.26

lb/min.} or above, the PCM determines that the CKP sensor circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (CCM).

• MIL illuminates if the PCM detects the above malfunction condition during first drive cycle.

• FREEZE FRAME DATA is available.

• DTCs are stored in the PCM memory.

POSSIBLE

CAUSE

• CKP sensor malfunction

• Connector or terminal malfunction

• CKP sensor is dirty.

• Short to the power supply between CKP sensor terminal A and PCM terminal 2P

• Short to the power supply between CKP sensor terminal B and PCM terminal 2W

• Short to ground between CKP sensor terminal C and main relay

• Short to ground between CKP sensor terminal B and PCM terminal 2W

• Open circuit between CKP sensor terminal A and PCM terminal 2P

• Open circuit between CKP sensor terminal B and PCM terminal 2W

• Open circuit between CKP sensor terminal C and main relay

• CKP sensor pulse wheel malfunction

• Both CKP sensor wires are shorted to each other

• PCM malfunction

PCM

CKP SENSOR

WIRING HARNESS-SIDE CONNECTOR

CKP SENSOR

MAIN RELAY

PCM

WIRING HARNESS SIDE CONNECTOR

2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M

2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P

2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

7 9

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