18 Cooling System Concerns-Runs Cold [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
(See THERMOSTAT INSPECTION
[Z6].)
Is the thermostat normal?
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING
• If malfunction remains, inspect related Service information perform repair or diagnosis.
10
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD
18
Engine takes excessive period for reaching normal operating temperature.
DESCRIPTION
• Thermostat malfunction
• Condenser fan system malfunction
POSSIBLE CAUSE
• Cooling fan system malfunction
Diagnostic procedure
STEP INSPECTION
Is customer complaint "Lack of
1 passenger compartment heat"
only?
Does engine speed continue at
2
fast idle?
3
Downloaded from
[Z6]
COOLING SYSTEM CONCERNS - RUNS COLD
RESULTS
Yes
No
Yes
No
Yes
https://carmanualshub.com/
• If the temperature gauge on the instrument
cluster indicates normal range but ECT PID
is not same as the temperature gauge
reading, inspect the ECT sensor.
• If the temperature gauge on the instrument
cluster indicates overheating but ECT PID is
normal, inspect the temperature gauge and
the heat gauge unit.
[Z6].)
[Z6].)
ACTION
Inspect A/C and heater system.
Go to the next step.
Go to symptom troubleshooting "No.9 Fast
idle/runs on".
(See NO.9 FAST IDLE/RUNS ON
Go to the next step.
Go to the next step.
- automotive repair manuals website
B3E010318881W51
[Z6].)