Test Description

The number(s) below refer to step(s) on the diagnostic table.

1. (4) This step, along with step 5, checks for the ability of the ECM to operate the cooling fans.
2. (8) 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. (16) 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. (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.
5. (37) By directly grounding the ECM connector terminals K28 and K12, the main and auxiliary cooling fans should run at high speed.

Fig 1: Engine Cooling Fan Circuit Check - Dual Fan Chart (1 Of 5)

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Fig 2: Engine Cooling Fan Circuit Check - Dual Fan Chart (2 Of 5)

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Fig 3: Engine Cooling Fan Circuit Check - Dual Fan Chart (3 Of 5)

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Fig 4: Engine Cooling Fan Circuit Check - Dual Fan Chart (4 Of 5)

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Fig 5: Engine Cooling Fan Circuit Check - Dual Fan Chart (5 Of 5)

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