Mazda CX 7. Manual - part 27

 

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Mazda CX 7. Manual - part 27

 

 

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–63

01-02

DTC P0116[L3 WITH TC]

id010239803900

Diagnostic procedure

DTC P0116

ECT circuit range/performance problem

DETECTION 

CONDITION

• The PCM monitors the maximum value and minimum value of engine coolant temperature when the engine 

is started and5 min have been passed after leaving the vehicle 6 h or more. If the difference between the 
maximum and the minimum values of the engine coolant temperature is below 6 

°C {10.8 °F}, the PCM 

determines that there is an ECT circuit range/performance problem.

Diagnostic support note

• This is a continuous monitor (CCM).

• The 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

• ECT sensor malfunction

• Connector or terminal malfunction

• PCM malfunction

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN 
RECORDED

• Has the FREEZE FRAME DATA been 

recorded?

Yes

Go to ne, then go next step.

No

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

2

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.

No

Go to the next step.

3

INSPECT ECT SENSOR CONNECTOR FOR 
POOR CONNECTION

• Turn the ignition switch off.

• Disconnect the ECT sensor connector.

• Inspect for poor connection (damaged, pulled-

out pins, corrosion, etc.).

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 6.

No

Go to the next step.

3

3

5

ECT SENSOR

A

B

2AH

2AY

PCM

PCM

WIRING HARNESS-SIDE CONNECTOR

ECT SENSOR

WIRING HARNESS-SIDE CONNECTOR

A

B

4

5

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

2E

2A

2I

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

2H

2D

2L

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

2G

2C

2K

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

2F

2B

2J

1871-1U-06B(01-02).fm  63 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–64

End Of Sie

DTC P0117[L3 WITH TC]

id010239804000

4

INSPECT ECT SENSOR

• Inspect the ECT sensor.

(See01-40-25 ENGINE COOLANT 
TEMPERATURE (ECT) SENSOR 
INSPECTION[L3 WITH TC].)

• Is there any malfunction?

Yes

Replace the ECT sensor, then go to Step 6.
(See01-40-24 ENGINE COOLANT TEMPERATURE (ECT) 
SENSOR REMOVAL/INSTALLATION[L3 WITH TC].)

No

Go to the next step.

5

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

• Turn the ignition switch off.

• Disconnect the PCM connector.

• Inspect for poor connection (damaged, pulled-

out pins, corrosion, etc.).

• Is there any malfunction?

Yes

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

No

Go to the next step.

6

VERIFY TROUBLESHOOTING OF DTC P0116 
COMPLETED

• Leave vehicle for8 h.

• Make sure to reconnect all disconnected 

connectors.

• Clear the DTC from the PCM memory using 

the M-MDS.

• Start the engine and wait for5 min.

• Is the same DTC present?

Yes

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

7

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])

No

DTC troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0117

ECT sensor circuit low input

DETECTION 

CONDITION

• The PCM monitors the ECT sensor signal. If the PCM detects the ECT sensor voltage below 0.2 V, the 

PCM determines that the ECT sensor circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (Engine cooling system).

• The 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

• ECT sensor malfunction

• Connect or terminal malfunction

• Short to ground in the wiring harness between ECT sensor terminal A and PCM connector terminal 2AH

• Short to each wiring harness in ECT signal circuit and ECT ground circuit

• PCM malfunction

1871-1U-06B(01-02).fm  64 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–65

01-02

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA AND 
DIAGNOSTIC MONITORING TEST RESULTS 
HAVE BEEN RECORDED

• Have the FREEZE FRAME DATA and 

DIAGNOSTIC MONITORING TEST RESULTS 
(Engine cooling system related) been 
recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA and DIAGNOSTIC 
MONITORING TEST RESULTS on the repair order, then 
go to the next step.

2

VERIFY RELATED REPAIR INFORMATION 
AVAILABILITY

• Verify 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.

No

Go to the next step.

3

INSPECT FOR BENT TERMINALS

• Turn the ignition switch off.

• Disconnect the ECT sensor connector.

• Inspect ECT sensor terminals A and B (part-

side) for bending.

• Is there any malfunction?

Yes

Repair or replace the terminal, then go to Step 7.

No

Go to the next step.

4

CLASSIFY ECT SENSOR MALFUNCTION OR 
WIRING HARNESS MALFUNCTION

• Connect the M-MDS to DLC-2.

• Access the ECT PID.

• Verify the ECT value when disconnecting the 

ECT sensor connector.

• Does the ECT value change?

Yes

Replace the ECT sensor, then go to Step 7.
(See01-40-24 ENGINE COOLANT TEMPERATURE (ECT) 
SENSOR REMOVAL/INSTALLATION[L3 WITH TC].)

No

Go to the next step.

DTC P0117

ECT sensor circuit low input

ECT SENSOR

A

B

2AH

2AY

PCM

PCM

WIRING HARNESS-SIDE CONNECTOR

ECT SENSOR

WIRING HARNESS-SIDE CONNECTOR

A

B

3

3

5 6

6

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

2E

2A

2I

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

2H

2D

2L

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

2G

2C

2K

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

2F

2B

2J

1871-1U-06B(01-02).fm  65 ページ  2006年3月15日 水曜日 午前10時32分

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–66

End Of Sie

DTC P0118[L3 WITH TC]

id010239804100

5

INSPECT ECT SIGNAL CIRCUIT FOR SHORT 
TO GROUND

• Turn the ignition switch off.

• Inspect for continuity between ECT sensor 

terminal A (wiring harness-side) and body 
ground.

• Is there continuity?

Yes

Repair or replace the wiring harness for a short to ground, 
then go to Step 7.

No

Go to the next step.

6

INSPECT ECT CIRCUIT FOR SHORT TO 
WIRING HARNESSES

• Inspect for continuity between ECT sensor 

terminal A and B (wiring harness-side).

• Is there continuity?

Yes

Repair or replace the wiring harness for a short, then go to 
the next step.

No

Go to the next step.

7

VERIFY TROUBLESHOOTING OF DTC P0117 
COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear the DTC from the PCM memory using 

the M-MDS.

• Start the engine.

• Is the same DTC present?

Yes

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

No

Go to the next step.

8

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 troubleshooting.
(See01-02-13 DTC TABLE[L3 WITH TC].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0118

ECT sensor circuit high input

DETECTION 

CONDITION

• The PCM monitors the ECT sensor signal. If the PCM detects the ECT sensor voltage is above 4.6 V, the 

PCM determines that the ECT sensor circuit has a malfunction.

Diagnostic support note

• This is a continuous monitor (Engine cooling system).

• The 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

• ECT sensor malfunction

• Connect or terminal malfunction

• Open circuit in the wiring harness between ECT sensor terminal A and PCM terminal 2AH

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

• Open circuit in the wiring harness between ECT sensor terminal B and PCM terminal 2AY

• PCM malfunction

1871-1U-06B(01-02).fm  66 ページ  2006年3月15日 水曜日 午前10時32分

 

 

 

 

 

 

 

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