Mazda 6 2002 Workshop Manual page 192

DTC P0117 ECT circuit low input
Diagnostic procedure
STEP
1 PERFORM DTC CONFIRMATION PROCEDURE
• Perform DTC CONFIRMATION PROCEDURE.
(See F–66 DTC CONFIRMATION
PROCEDURE.)
• Is same DTC present?
2 INSPECT TERMINAL BENT
• Turn ignition key to OFF.
• Disconnect ECT sensor connector.
• Inspect for bent of ECT sensor terminals A and
B (part-side).
• Is there any malfunction?
3 CLASSIFY ECT SENSOR MALFUNCTION OR
HARNESS MALFUNCTION
• Connect WDS or equivalent to DLC-2.
• Access ECT PID.
• Verify ECT value when disconnecting ECT
sensor connector.
• Does ECT value change?
4 INSPECT ECT SIGNAL CIRCUIT FOR SHORT
TO GROUND
• Turn ignition key to OFF.
• Inspect continuity between ECT sensor
terminal A (harness-side) and body ground.
• Is there any continuity?
5 INSPECT IAT CIRCUIT FOR SHORT
HARNESSES
• Inspect continuity between ECT sensor
terminal A and B (harness-side).
• Is there any continuity?
ON-BOARD DIAGNOSTIC
INSPECTION
Yes Go to net step.
No Intermittent concern eists. Go to INTERMITTENT
CONCERN TROUBLESHOOTING procedure.
(See F–227 INTERMITTENT CONCERN
TROUBLESHOOTING.)
Yes Repair or replace terminal, then go to Step 6.
No Go to net step.
Yes Replace ECT sensor, then go to Step 6.
No Go to net step.
Yes Repair or replace harness for short to ground, then go to
Step 6.
No Go to net step.
Yes Repair or replace harness for short, then go to net step.
No Go to net step.
ACTION
F–95
F