Circuit Description
The high speed cooling fan relay is controlled by the electronic control module (ECM). The ECM applies a ground to the high speed cooling fan relay, while also applying ground to the low speed cooling fan relay, to achieve high speed cooling fan operation. The ECM determines when to activate the high speed cooling fan relay depending on the coolant temperature and the A/C system high side pressure.
Conditions for Setting the DTC
| • | A short to battery voltage condition exists. |
| • | This condition is present for more than 2 seconds. |
Diagnostic Aids
An intermittent problem may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside the insulation.
Step | Action | Values | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Determine whether the Diagnostic System Check has been performed. Was the Diagnostic System Check performed? | -- | Go to Step 2 | |||||||||
2 | Inspect the fuse F17. Is the fuse in good condition? | -- | Go to Step 4 | Go to Step 3 | ||||||||
3 |
Did you complete the repair? | -- | System OK | -- | ||||||||
4 |
Does the voltage measure within the value specified? | 0 V | Go to Step 6 | Go to Step 5 | ||||||||
5 |
Did you complete the repair? | -- | System OK | -- | ||||||||
6 | Measure the resistance between the low speed cooling fan relay terminals 86 and 85. Does the resistance measure near the value specified? | 0 ohms | Go to Step 7 | Go to Step 8 | ||||||||
7 |
Did you complete the repair? | -- | System OK | -- | ||||||||
8 | Inspect for a short to voltage or open in the wiring between the following:
Is the problem found? | -- | Go to Step 9 | Go to Step 10 | ||||||||
9 |
Did you complete the repair? | -- | System OK | -- | ||||||||
10 | Inspect for a poor connection at the ECM connector terminal A10. Is the condition found? | -- | Go to Step 11 | Go to Step 12 | ||||||||
11 |
Did you complete the repair? | -- | System OK | -- | ||||||||
12 |
Did you complete the repair? | -- | System OK | -- |
