Mazda 626 - Page 73

ON-BOARD DIAGNOSTIC
STEP
[ INSPECTION
ACTION
5 INSPECT ECT SENSOR SIGNAL CIRCUIT FOR
SHORT TO POWER
• Turn ignition key to ON (Engine OFF).
• Measure voltage between ECT sensor
terminal A (harness-side) and body ground.
• Is voltage B+?
Yes
Repair or replace harness, then go to Step 9.
No Go to next step.
6 INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Disconnect PCM connector.
• Check for poor connection (damaged,
pulled-out pins, corrosion, etc.).
• Are there any malfunction?
Yes Repair or replace terminal, then go to Step 9.
No Go to next step.
7
INSPECT ECT SENSOR SIGNAL CIRCUIT FOR
OPEN
• Check continuity between ECT sensor
terminal A (harness-side) and PCM terminal
3E.
• Is there any continuity?
Yes Go to next step.
No Repair or replace harness, then go to Step 9.
8
INSPECT ECT SENSOR GROUND CIRCUIT
FOR OPEN
• Check continuity between ECT sensor
terminal B (harness-side) and PCM terminal
4F.
• Is there any continuity?
Yes Go to next step.
No
Repair or replace harness, then go to next step.
9 VERIFY TROUBLESHOOTING OF DTC P0118
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using NGS
tester.
• Turn ignition key to ON (Engine OFF).
• Is same DTC present?
Yes
Replace PCM, then go to next step.
No Go to next step.
10
VERIFY AFiER REPAIR PROCEDURE
• Perform “After Repair Procedure.”
(See F1 36 AFTER REPAIR PROCEDURE)
• Are there any DTCs present?
Yes
Go to applicable DTC inspection.
(See F1-37 DTC TABLE)
No
Troubleshooting completed.
F1-52