Forenza L4-2.0L (2004)
the coolant temperature is 94 °C (201 °F).
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The ECM will turn the cooling fans on at high speed when the coolant temperature is 101 °C (214 °F). The ECM will change the cooling fans
from high speed to low speed when the coolant temperature is 98 °C (208 °F).
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The ECM will turn the cooling fans on at low speed when the A/C system is ON. The ECM will change the cooling fans from low speed to high
speed when the high side A/C pressure is 1,882 kPa (273 psi) then return to low speed when the high side A/C pressure is 1,448 kPa (210 psi).
When the A/C system is ON, the ECM will change the cooling fans from low to high speed when the coolant temperature reaches 117 °C (244 °F)
then return to low speed when the coolant temperature reaches 114 °C (237 °F).
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The cooling fan circuit can be checked quickly by disconnecting the ECM connector 2 and grounding the connector terminal C50. This should
create low speed cooling fan operation with the ignition ON. By grounding the ECM connector terminals C50 and E34 and turning the ignition
ON, high speed cooling fan operation should be achieved.
Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
1. This step, along with Step 5, checks for the ability of the ECM to operate the cooling fans.
2. This step, along with Step 9, checks for the ability of the ECM to operate the cooling fans in response to A/C pressure readings.
3. After confirming battery voltage and the ECM supplying a ground to the coil side of the cooling fan relay A, by jumpering connector terminals 30
and 87 it will be determined if the relay is at fault or a wiring problem is present.
4. This step checks for the presence of battery voltage to the main cooling fan when the A/C is ON. If battery voltage is present and the cooling fans
are not operating, the problem is in the ground side of the cooling fan circuit.
5. By directly grounding the ECM connector terminals C50 and E34, the main and auxiliary cooling fans should run at high speed.
Troubleshooting
