Nubira SX Hatchback L4-2.0L DOHC D-TEC MFI (1999)
Steps 43 To 49
Test Description
The number(s) below refer to step(s) on the diagnostic table.
4. This step, along with Step 5, checks for the ability of the PCM/ECM to operate the cooling fans.
8. This step, along with Step 9, checks for the ability of the PCM/ECM to operate the cooling fans in response to A/C pressure readings.
16. After confirming battery voltage and the PCM/ECM supplying a ground to the coil side of the low speed cooling fan relay, by jumpering
connector terminals 30 and 87 it will be determined if the relay is at fault or a wiring problem is present.
30. The replacement PCM/ECM must be reprogrammed. Refer to Powertrain Control Module / Service and Repair.
31. 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.
37. By directly grounding the PCM/ECM connector terminals C13 and C12, the main and auxiliary cooling fans should run at high speed.
