Mazda CX 7. Manual — part 27
![](/vehicles/rke/eetan/dot/hugldang.png)
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
![](/vehicles/rke/eetan/dot/imaittovandi.png)
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
![](/vehicles/rke/eetan/dot/paldet.png)
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
![](/vehicles/rke/eetan/dot/thekt.png)
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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