Successive Overheating

Test 1 - Test 3:

Test 4 - Test 5:

SYMPTOM
SUCCESSIVE OVERHEATING

TEST NOTE
This symptom is diagnosed using the test HEATER IN LOCKOUT MODE.

WHEN MONITORED
After heater activation, when the system is in a steady state of operation.

SET CONDITION
This DTC will set if successive overheating occurs.

POSSIBLE CAUSES
- Cabin heater assembly or heater booster assembly
- Heater's coolant hoses restricted/leaking/damaged
- Engine's cooling system fault
- Cabin heater or heater booster control unit
- Heater overheated/successive overheating cleared, additional DTC(S) present