Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Cooling Fan System Check? | Go to Step 2 | Go to Cooling Fan System Check |
2 |
Notice: Installation of the proper relay is critical. If an enhanced relay -- equipped with a diode -- is installed into a position requiring a standard relay -- equipped without a diode -- excessive current will damage any components associated with the relay or its associated circuits. Did you find and correct the condition? | Go to Step 16 | Go to Step 3 |
3 |
Notice: Installation of the proper relay is critical. If an enhanced relay -- equipped with a diode -- is installed into a position requiring a standard relay -- equipped without a diode -- excessive current will damage any components associated with the relay or its associated circuits. Test the battery positive voltage circuit of the relay coil of fan control relay K26 for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 4 |
4 |
Notice: Installation of the proper relay is critical. If an enhanced relay -- equipped with a diode -- is installed into a position requiring a standard relay -- equipped without a diode -- excessive current will damage any components associated with the relay or its associated circuits. Test the battery positive voltage circuit of the auxiliary engine coolant fan #1 and auxiliary engine coolant fan #2 of the fan control relay K26 for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Repairs. Did you find and correct the condition? | Go to Step 16 | Go to Step 5 |
5 |
Notice: Installation of the proper relay is critical. If an enhanced relay -- equipped with a diode -- is installed into a position requiring a standard relay -- equipped without a diode -- excessive current will damage any components associated with the relay or its associated circuits. Test the battery positive voltage circuit of the electric cooling fan of the fan control relay K26 for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in wiring Repairs. Did you find and correct the condition? | Go to Step 16 | Go to Step 6 |
6 |
Notice: Installation of the proper relay is critical. If an enhanced relay -- equipped with a diode -- is installed into a position requiring a standard relay -- equipped without a diode -- excessive current will damage any components associated with the relay or its associated circuits. Connect a 20 A fused jumper between the battery positive circuit of the fan control relay K26 and the electric cooling fan motor supply voltage circuit of the fan control relay K26. Does the electric cooling fan operate at low speed? | Go to Step 7 | Go to Step 9 |
7 | Inspect for poor connections at the harness connector of the fan control relay K26. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 8 |
8 |
Notice: Installation of the proper relay is critical. If an enhanced relay -- equipped with a diode -- is installed into a position requiring a standard relay -- equipped without a diode -- excessive current will damage any components associated with the relay or its associated circuits. Replace the fan control relay K26. Did you complete the repair? | Go to Step 16 | -- |
9 | Test the supply voltage circuit of the engine coolant fan resistor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 10 |
10 | Test the supply voltage circuit of the electric cooling fan for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 11 |
11 | Test the ground circuit of the electric cooling fan for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 12 |
12 | Test the integrity of the engine coolant fan resistor. Is the engine coolant fan resistor OK? | Go to Step 14 | Go to Step 13 |
13 | Replace the engine coolant fan resistor. Did you complete the repair? | Go to Step 16 | -- |
14 | Inspect for poor connections at the harness connector of the electric cooling fan motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 15 |
15 | Replace the electric cooling fan motor. Refer to Engine Cooling Fan Replacement . Did you complete the repair? | Go to Step 16 | -- |
16 |
Does the electric cooling fan operate properly at low speed? | Go to Cooling Fan System Check | Go to Step 1 |
