ENGINE COOLING DIAGNOSIS
The fan controller is powered from fusible link
The PCM judges the required revolution speed of
The cause could be a malfunction of the fan
The cause could also be a malfunction of the fan
Malfunction of fusible link
Malfunction of fan control relay
Malfunction of fan controller
Malfunction of PCM
Damaged wiring harness or connector
Required Special Tool:
MB991223: Harness Set
STEP 1. Check the circuit at fan controller connector A-30.
the harness side connector.
(2) Measure the voltage between terminal number 3 and
When the ignition switch is turned to "ON" position,
Q: Is the voltage battery positive voltage when the ignition
STEP 2. Check the fan control relay.
Q: Is the fan control relay in good condition?