Step
| Action
| Value(s)
| Yes
| No
|
1
| Did you perform the Cooling Fan Diagnostic System Check?
| --
|
Go to Step 2
| Go to
Cooling Fan System Check
|
2
|
- Disconnect the fan control relay K26 connector.
- Use the DMM to measure the resistance between terminal 1
of the coolant fan test connector and terminal 6 of the fan control
relay K26.
Is the measured resistance within the specified value?
| Less than 2 ohms
|
Go to Step 4
|
Go to Step 3
|
3
|
- Locate an open or a high resistance in circuits XP999 and/or
XP3.
- Repair the open or the high resistance in circuits XP999
and/or XP3.
Did you complete the repair?
| --
|
Go to Step
17
| --
|
4
| Use the DMM in order to measure the voltage between terminal 3
of the fan control relay K26 and a known good ground.
Does the voltage measure near the specified value?
| B+
|
Go to Step 6
|
Go to Step 5
|
5
|
- Inspect fuse #50 for an open. If the fuse is open, locate a short
to ground in the battery positive voltage circuit.
- If the fuse is OK, locate an open or high resistance in circuits
A6 and/or A310.
- Repair the open or the high resistance in circuits A6 and/or
A310.
Did you complete the repair?
| --
|
Go to Step
17
| --
|
6
| Use the DMM in order to measure the voltage between terminal 4
of the fan control relay K26 and a known good ground.
Does the voltage measure near the specified value?
| B+
|
Go to Step 8
|
Go to Step 7
|
7
|
- Inspect fuse #52 for an open. If the fuse is open, locate a short
to ground in the battery positive voltage circuit.
- If the fuse is OK, locate an open or a high resistance in circuits
A300, A220 and/or A223.
- Repair the open or the high resistance in circuits A300,
A220 and/or A223.
Did you complete the repair?
| --
|
Go to Step 17
| --
|
8
| Connect a fused jumper between terminal 4 and terminal 5
of the fan control relay K26 connector.
Does the engine coolant fan operate at low speed?
| --
|
Go to Step 9
|
Go to Step 10
|
9
| Replace the fan
control relay K26.
Did you complete the repair?
| --
|
Go to Step
17
| --
|
10
|
- Leave fused jumper connected.
- Disconnect the engine coolant fan resistor.
- Use the DMM in order to measure the voltage between terminal 1
circuit AP2 of the engine coolant fan resistor connector and a known good
ground.
Does the voltage measure near the specified value?
| B+
|
Go to Step 12
|
Go to Step 11
|
11
|
- Locate an open or high resistance in circuits AP2 and/or
AP1.
- Repair an open or high resistance in circuits AP2 and/or
AP1.
Did you complete the repair?
| --
|
Go to Step
17
| --
|
12
|
- Disconnect the electric cooling fan connector.
- Use the DMM in order to measure the resistance between terminal 1circuit
AM6 of the engine coolant fan resistor connector and terminal A of
the electric cooling fan connector.
Does the resistance measure near the specified value?
| Less than 2 ohms
|
Go to Step 14
|
Go to Step 13
|
13
|
- Locate an open or a high resistance in circuits AM17 and/or
AM6.
- Repair the open or the high resistance in circuits AM17
and/or AM6.
Did you complete the repair?
| --
|
Go to Step
17
| --
|
14
|
- Turn the ignition switch to the OFF position.
- Use the DMM in order to measure the resistance between terminal B
of the electric cooling fan connector and a known good ground.
Does the resistance measure near the specified value?
| Less than 2 ohms
|
Go to Step 16
|
Go to Step 15
|
15
|
- Locate an open or a high resistance in CKT F100.
- Repair the open or the high resistance in CKT F100.
Did you complete the repair?
| --
|
Go to Step
17
| --
|
16
|
- Check the integrity of the engine coolant fan resistor.
- Replace the engine coolant fan resistor if it is open.
- Replace the electric cooling fan if the engine coolant fan resistor
is OK. Refer to
Engine Cooling Fan Replacement
in Engine Cooling.
Did you complete the repair?
| --
|
Go to Step
17
| --
|
17
|
- Connect all connectors and components that were previously disconnected.
- Verify that the electric cooling fan operates properly at low
speed.
Does the electric cooling fan operate properly at low speed?
| --
| Go to
Cooling Fan System Check
|
Go to Step 1
|
