Mazda CX-7 2007 Workshop Manual page 109

DTC P0118 ECT sensor circuit high input
ECT SENSOR
WIRING HARNESS-SIDE CONNECTOR
B A
Diagnostic procedure
STEP
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?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related Service Bulletins and/or on-line
repair information availability.
• Is any related repair information available?
3 INSPECT POOR CONNECTION OF ECT
SENSOR CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect ECT sensor connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion.)
• Is there any malfunction?
4 CLASSIFY ECT SENSOR MALFUNCTION OR
WIRING HARNESS MALFUNCTION
• Connect the M-MDS to the DLC-2.
• Access the ECT PID.
• Connect a jumper wire between ECT sensor
terminals A and B.
• Verify the ECT value.
• Is the voltage 4.6 V or below?
ON-BOARD DIAGNOSTIC [L3 WITH TC]
ECT SENSOR
3
A
3
B
INSPECTION
PCM
6
5
2AH
7
6
8
2AY
PCM
WIRING HARNESS-SIDE CONNECTOR
2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M
2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z 2V 2R 2N
2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O
2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P
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.
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.
Yes Repair or replace the terminal, then go to Step 9.
No Go to the next step.
Yes Replace the ECT sensor, then go to Step 9.
No Go to the next step.
2I 2E 2A
2J 2F 2B
2K 2G 2C
2L 2H 2D
ACTION
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01-02