Cooling Fan Inoperative - Auxiliary P32 (L65)
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Does the auxiliary engine coolant fan motor operate? | -- | Go to Step 2 | Go to Step 4 |
2 | Does the auxiliary engine coolant fan motor operate with high coolant temperatures? | -- | Go to Step 3 | Go to Step 15 |
3 | Does the auxiliary engine coolant fan motor operate with the air conditioning (A/C) ON? | -- | -- | Go to Step 18 |
4 | Inspect the condition of ground G 200. Is G 200 clean and tight? | -- | Go to Step 6 | Go to Step 5 |
5 | Repair G 200 as necessary. Is the repair complete? | -- | System OK | -- |
6 |
Does the test light illuminate? | -- | Go to Step 8 | Go to Step 7 |
7 | Locate and repair the open in CKT 2 (RED) between the fusible link and the fan control relay connector. Is the repair complete? | -- | System OK | -- |
8 |
Did the test light illuminate? | -- | Go to Step 10 | Go to Step 9 |
9 | Locate and repair the open in CKT 539 (PNK) between the ENG-I fuse and the fan control relay connector. Is the repair complete? | -- | System OK | -- |
10 | Connect a fused jumper wire from cavity 30 to cavity 87 of the fan control relay connector. Refer to Using Fused Jumper Wires in Wiring Systems. Does the auxiliary engine coolant fan motor operate? | -- | Go to Step 15 | Go to Step 11 |
11 |
Does the test light illuminate? | -- | Go to Step 13 | Go to Step 12 |
12 | Locate and repair the open in CKT 702 (RED) between the fan control relay connector and the auxiliary engine coolant fan motor connector. Is the repair complete? | -- | System OK | -- |
13 | Connect a test light from the auxiliary engine coolant fan motor connector, cavity B to B +. Does the test light illuminate? | -- | Go to Step 23 | Go to Step 14 |
14 | Locate and repair the open in CKT 250 (BLK) between the connector and G 200. Is the repair complete? | -- | System OK | -- |
15 |
Does the test light illuminate? | -- | Go to Step 20 | Go to Step 16 |
16 | Inspect CKT 473 (DK BLU) for an open condition. Did you find an open condition? | -- | Go to Step 17 | Go to Step 21 |
17 | Locate and repair the open in CKT 473 (DK BLU). Is the repair complete? | -- | System OK | -- |
18 |
Does the test light illuminate? | -- | Go to Step 19 | Go to Step 16 |
19 | Connect a test light from the refrigerant pressure switch connector on the auxiliary engine coolant fan, cavity A to B +. Does the test light illuminate? | -- | Go to Step 22 | Go to Step 14 |
20 | Replace the temperature switch on the auxiliary engine coolant fan, located in the thermostat housing crossover. Is the repair complete? | -- | System OK | -- |
21 | Replace the fan control relay. Refer to Cooling System Components . Is the repair complete? | -- | System OK | -- |
22 | Replace the refrigerant pressure switch on the auxiliary engine coolant fan . Refer to Cooling System Components . Is the repair complete? | -- | System OK | -- |
23 | Replace the auxiliary engine coolant fan motor. Refer to Cooling System Components . Is the repair complete? | -- | System OK | -- |
Cooling Fan Inoperative - Auxiliary P42
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Does the test light illuminate? | -- | Go to Step 3 | Go to Step 2 |
2 | Repair the open in CKT 2 (RED) between the fusible link and the fan control relay connector. Is the repair complete? | -- | System OK | -- |
3 | Connect a fused jumper wire from the fan control relay connector, cavity 30 to cavity 87. Refer to Using Fused Jumper Wires in Wiring Systems. Does the auxiliary engine coolant fan motor operate? | -- | Go to Step 8 | Go to Step 4 |
4 |
Does the test light illuminate? | -- | Go to Step 6 | Go to Step 5 |
5 | Repair the open in CKT 702 (RED) between the fan control relay connector and the auxiliary engine coolant fan motor connector. Is the repair complete? | -- | System OK | -- |
6 |
Does the test light illuminate? | -- | Go to Step 16 | Go to Step 7 |
7 | Locate and repair the open in CKT 250 (BLK) between the auxiliary engine coolant fan motor connector and G 200. Is the repair complete? | -- | System OK | -- |
8 |
Did the test light illuminate? | -- | Go to Step 10 | Go to Step 9 |
9 | Locate and repair the open in CKT 539 (PNK) between the ENG -I fuse and the fan control relay connector. Is the repair complete? | -- | System OK | -- |
10 |
Does the test light illuminate? | -- | Go to Step 11 | Go to Step 12 |
11 |
Does the test light illuminate? | -- | Go to Step 15 | Go to Step 14 |
12 | Inspect CKT 473 (DK BLU) for an open condition. Did you find an open condition? | -- | Go to Step 13 | Go to Step 17 |
13 | Locate and repair the open in CKT 473 (DK BLU) between the fan control relay connector and the refrigerant pressure switch connector on the auxiliary engine coolant fan. Is the repair complete? | -- | System OK | -- |
14 | Locate and repair the open in CKT 250 (BLK) between the refrigerant pressure switch connector on the auxiliary engine coolant fan and G 200. Is the repair complete? | -- | System OK | -- |
15 | Replace the refrigerant pressure switch on the auxiliary engine coolant fan. Refer to Cooling System Components . Is the repair complete? | -- | System OK | -- |
16 | Replace the auxiliary engine coolant fan motor. Is the repair complete? | -- | System OK | -- |
17 | Replace the fan control relay. Refer to Cooling System Components . Is the repair complete? | -- | System OK | -- |
Cooling Fan Inoperative - Auxiliary P32 (L29)
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Before using this table, confirm that the air conditioning (A/C) system has an adequate state of charge. Does the A/C system have an adequate state of charge? | -- | Go to Step 2 | Refer to Refrigerant System Checks in HVAC Systems |
2 | Inspect the condition of the fusible link. Ensure that the connection of the fusible link is clean and tight at the battery junction block. Is the fusible link open? | -- | Go to Step 3 | Go to Step 4 |
3 | Locate and repair the source of the overload, and replace the fusible link. Is the repair complete? | -- | System OK | -- |
4 | Inspect the condition of the ground G 200. Is it clean and tight? | -- | Go to Step 6 | Go to Step 5 |
5 | Repair G 200 as necessary. Is the repair complete? | -- | System OK | -- |
6 |
Does the test light illuminate? | -- | Go to Step 8 | Go to Step 7 |
7 | Locate and repair the open in CKT 2 (RED) between the fusible link and the fan control relay connector. Is the repair complete? | -- | System OK | -- |
8 | Connect a fused jumper wire between cavity 30 and cavity 87 of the fan control relay connector. Refer to Using Fused Jumper Wires in Wiring Systems. Does the auxiliary engine coolant fan motor operate? | -- | Go to Step 9 | Go to Step 11 |
9 |
Did the test light illuminate? | -- | Go to Step 15 | Go to Step 10 |
10 | Locate and repair the open in CKT 540 (ORN) between the ENG -BAT fuse and the fan control relay connector. Is the repair complete? | -- | System OK | -- |
11 |
Does the test light illuminate? | -- | Go to Step 13 | Go to Step 12 |
12 | Locate and repair the open in CKT 702 (RED) between the fan control relay connector and the auxiliary engine coolant fan motor connector. Is the repair complete? | -- | System OK | -- |
13 | Connect a test light from the auxiliary engine coolant fan motor connector, cavity A to B +. Does the test lamp light? | -- | Go to Step 23 | Go to Step 14 |
14 | Locate and repair the open in CKT 250 (BLK) between the auxiliary engine coolant fan motor connector and G 200. Is the repair complete? | -- | System OK | -- |
15 |
Does the test light illuminate? | -- | Go to Step 18 | Go to Step 16 |
16 | Inspect CKT 473 (DK BLU) for an open condition. Did you find an open condition? | -- | Go to Step 17 | Go to Step 24 |
17 | Locate and repair the open in CKT 473 (DK BLU) between the VCM connector C 4 and the fan control relay connector. Is the repair complete? | -- | System OK | -- |
18 |
Did the auxiliary engine coolant fan motor operate? | -- | Go to Step 19 | Go to Step 24 |
19 |
Is the resistance greater than the specified value? | 1.0 ohms | Go to Step 20 | Go to Step 21 |
20 | Locate and repair the open in CKT 604 (DK BLU) between the refrigerant pressure switch connector on the auxiliary engine coolant fan and the VCM connector C 3. Is the repair complete? | -- | System OK | -- |
21 | Connect a test light from the refrigerant pressure switch connector on the auxiliary engine coolant fan, cavity A to B +. Does the test light illuminate? | -- | Go to Step 25 | Go to Step 22 |
22 | Locate and repair the open in CKT 250 (BLK) between the refrigerant pressure switch connector on the auxiliary engine coolant fan and G 200. Is the repair complete? | -- | System OK | -- |
23 | Replace the auxiliary engine coolant fan motor. Is the repair complete? | -- | System OK | -- |
24 | Replace the fan control relay. Refer to Cooling Fan Relay Replacement - Auxiliary . Is the repair complete? | -- | System OK | -- |
25 |
Did the auxiliary engine coolant fan operate? | -- | Go to Step 26 | Go to Step 27 |
26 | Replace the refrigerant pressure switch connector on the auxiliary engine coolant fan. Is the repair complete? | -- | System OK | -- |
27 | Refer to Electric Cooling Fan Diagnosis in Engine Controls for VCM controlled electric cooling fan diagnostics. Have you completed the VCM diagnostics? | -- | System OK | -- |
