LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2006 >> Verona Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - System And Component Checks, Specifications, Special Tools And Equipment >> Engine Cooling Fan Circuit Check >> Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Cooling Fan Circuit Check: Troubleshooting

TROUBLESHOOTING CHART

Step Action Value (s) Yes No
1 Perform an ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK .
Was the check performed?		 - Go to Step 2. Go to ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK .
2
  1. Check the engine fuse block fuse Ef4.
  2. Replace the fuse as needed.

Is the fuse OK?		 - Go to Step 3. Go to Diagnostic Aids .
3
  1. Check the engine fuse block fuse Ef7.
  2. Replace the fuse as needed.

Is the fuse OK?		 - Go to Step 4. Go to Diagnostic Aids .
4
  1. Turn the ignition OFF.
  2. Turn the A/C switch OFF.
  3. Connect a scan tool to the Data Link Connector (DLC).
  4. Start the engine.
  5. The cooling fans should run at low speed when the coolant temperature reaches the value specified.

Do the cooling fans run at low speed?		 96 °C (205 ° F) Go to Step 5. Go to Step 10.
5
  1. Turn the ignition OFF.
  2. Turn the A/C switch OFF.
  3. Connect a scan tool to the DLC.
  4. Start the engine.
  5. The cooling fans should run at high speed when the coolant temperature reaches the value specified.

Do the cooling fans run at high speed?		 99 °C (210 ° F) Go to Step 6. Go to Step 33.
6
  1. Turn the ignition OFF.
  2. Start the engine.
  3. Turn the A/C switch ON.

Does the A/C compressor clutch engage?		 - Go to Step 8. Go to Step 7.
7
  1. Diagnose the A/C compressor clutch circuit.
  2. Repair the A/C compressor clutch circuit as needed.
  3. Start the engine.
  4. Turn the A/C switch ON.

Does the A/C compressor clutch engage?		 - Go to Step 8. -
8 Do the cooling fans run at low speed? - Go to Step 9. Go to Step 31.
9
  1. Turn the ignition OFF.
  2. Connect the A/C pressure gauges.
  3. Start the engine.
  4. Turn the A/C switch ON.
  5. The cooling fans should run at high speed when the high side A/C pressure reaches the value specified.

Do the cooling fans run at high speed?		 1,862 kPa (270 psi) System OK -
10
  1. Turn the ignition OFF.
  2. Connect a scan tool to the DLC.
  3. The coolant temperature should be above 96 °C (205 °F).
  4. Disconnect the auxiliary cooling fan connector.
  5. Turn the ignition ON.
  6. Connect a test light between the auxiliary cooling fan connector terminal 2 and ground.

Is the test light ON?		 - Go to Step 11. Go to Step 12.
11
  1. Turn the ignition OFF.
  2. Connect a scan tool to the DLC.
  3. The coolant temperature should be above 96 °C (205 °F).
  4. Disconnect the auxiliary cooling fan connector.
  5. Connect a test light between the auxiliary cooling fan connector terminal 1 and battery positive.

Is the test light ON?		 - Go to Step 28. Go to Step 17.
12
  1. Turn the ignition OFF.
  2. Disconnect the low speed cooling fan relay.
  3. Connect a test light between the low speed cooling fan relay connector terminal 85 and ground.
  4. Turn the ignition ON.

Is the test light ON?		 - Go to Step 13. Go to Step 24.
13
  1. Turn the ignition OFF.
  2. Connect the low speed cooling fan relay.
  3. Disconnect the Engine Control Module (ECM) connector.
  4. Connect a fused jumper between the ECM connector terminal A26 and ground.
  5. Turn the ignition ON.

Do the cooling fans run at low speed?		 - Go to Step 30. Go to Step 14.
14 Check for an open wire between the low speed cooling fan relay connector terminal 86 and the ECM connector terminal A26.
Is the problem found?		 - Go to Step 25. Go to Step 15.
15
  1. Turn the ignition OFF.
  2. Disconnect the low speed cooling fan relay.
  3. Connect a test light between the low speed cooling fan relay connector terminal 30 and ground.

Is the test light ON?		 - Go to Step 16. Go to Step 23.
16 Connect a fused jumper between the low speed cooling fan relay connector terminals 30 and 87.
Do the cooling fans run at low speed?		 - Go to Step 26. Go to Step 17.
17
  1. Disconnect the cooling fan control relay.
  2. Connect a fused jumper between the low speed cooling fan relay connector terminals 30 and 87.
  3. Connect a fused jumper between the series/parallel cooling fan relay connector terminals 30 and 87a.

Do the cooling fans run at low speed?		 0 Ω Go to Step 27. Go to Step 18.
18 Check the wire between the low speed cooling fan relay connector terminal 87 to the auxiliary cooling fan connector terminal 2 for an open.
Is the problem found?		 - Go to Step 26. Go to Step 17.
19 Check the wire between the auxiliary cooling fan connector terminal 1 and the cooling fan control relay connector terminal 30 for an open.
Is the problem found?		 - Go to Step 22. Go to Step 20.
20 Check the wire between the cooling fan control relay connector terminal 87a and the main cooling fan connector terminal 2 for an open.
Is the problem found?		 - Go to Step 22. Go to Step 21.
21 Check for an open wire between the main cooling fan connector terminal 1 and ground.
Is the problem found?		 - Go to Step 22. Go to Step 29.
22 Repair the open wire as needed.
Is the repair complete?		 - System OK -
23 Repair the open between the low speed cooling fan relay connector terminal 30 and the battery.
Is the repair complete?		 - System OK -
24 Repair the open between the low speed cooling fan relay connector terminal 85 and the ignition switch.
Is the repair complete?		 - System OK -
25 Repair the open wire between the low speed cooling fan relay connector terminal 86 and the ECM connector terminal A26.
Is the repair complete?		 - System OK -
26 Replace the low speed cooling fan relay.
Is the repair complete?		 - System OK -
27 Replace the cooling fan control relay.
Is the repair complete?		 - System OK -
28 Replace the auxiliary cooling fan.
Is the repair complete?		 - System OK -
30 Replace the ECM.
Is the repair complete?		 - System OK -
31
  1. Turn the ignition OFF.
  2. Disconnect the auxiliary cooling fan connector.
  3. Connect a test light between the auxiliary cooling fan connector terminal 2 and ground.
  4. Turn the A/C switch ON.
  5. Start the engine.

Is the test light ON?		 - Go to Step 32. Go to Step 12.
32
  1. Turn the ignition OFF.
  2. Connect a test light between the main cooling fan connector terminal 1 and
  3. battery positive. 3. Turn the A/C switch ON.
  4. Start the engine.

Is the test light ON?		 - Go to Step 34. Go to Step 44.
33
  1. Turn the ignition OFF.
  2. Disconnect the high speed cooling fan relay.
  3. Connect a test light between the high speed cooling fan relay connector terminal 85 and ground.
  4. Turn the ignition ON.

Is the test light ON?		 - Go to Step 34. Go to Step 44.
34
  1. Turn the ignition OFF.
  2. Connect a test light between the high speed cooling fan relay connector terminal 30 and ground.

Is the test light ON?		 - Go to Step 35. Go to Step 45.
35
  1. Disconnect the cooling fan control relay.
  2. Connect a test light between the cooling fan control relay connector terminal 85 and ground.
  3. Turn the ignition ON.

Is the test light ON?		 - Go to Step 36. Go to Step 46.
36
  1. Turn the ignition OFF.
  2. Connect a test light between the cooling fan control relay connector terminal 87 and battery positive.

Is the test light ON?		 - Go to Step 37. Go to Step 47.
37
  1. Connect the main cooling fan connector.
  2. Connect the high speed cooling fan relay.
  3. Connect the cooling fan control relay.
  4. Disconnect the ECM connector.
  5. Connect a fused jumper between the ECM connector terminal A26 and ground.
  6. Connect a fused jumper between the ECM connector terminal A51 and ground.
  7. Turn the ignition ON.

Do the cooling fans run at high speed?		 - Go to Step 30. Go to Step 38.
38
  1. Turn the ignition OFF.
  2. Check for an open wire between the high speed cooling fan relay connector terminal 86 and the ECM connector terminal A51.

Is the problem found?		 - Go to Step 22. Go to Step 39.
39
  1. Disconnect the high speed cooling fan relay.
  2. Connect a test light between the high speed cooling fan relay connector terminal 87 and battery positive.

Is the test light ON?		 - Go to Step 40. Go to Step 48.
40
  1. Disconnect the ECM connector.
  2. Connect a fused jumper between the ECM connector terminal A51 and ground.
  3. Disconnect the cooling fan control relay.
  4. Connect a test light between the cooling fan control relay connector terminal 86 and battery positive.

Is the test light ON?		 - Go to Step 41. Go to Step 49.
41
  1. Connect the cooling fan control relay.
  2. Connect a fused jumper between the ECM connector terminal A51 and ground.
  3. Disconnect the high speed cooling fan relay.
  4. Connect a fused jumper between the high speed cooling fan relay connector terminals 30 and 87.
  5. Disconnect the low speed cooling fan relay.
  6. Connect a fused jumper between the low speed cooling fan relay connector terminals 30 and 87.
  7. Turn the ignition ON.

Do the cooling fans run at high speed?		 - Go to Step 43. Go to Step 42.
42
  1. Turn the ignition OFF.
  2. Connect a fused jumper between the ECM connector terminal A51 and ground.
  3. Disconnect the cooling fan control relay.
  4. Connect a fused jumper between the cooling fan control relay connector terminals 30 and 87.
  5. Connect a fused jumper between the low speed cooling fan relay connector terminals 30 and 87.
  6. Turn the ignition ON.

Do the cooling fans run at high speed?		 - Go to Step 27. -
43 Replace the high speed cooling fan relay.
Is the repair complete?		 - System OK -
44 Repair the open wire between the high speed cooling fan relay connector terminal 85 and the ignition switch.
Is the repair complete?		 - System OK -
45 Repair the open wire between the high speed cooling fan relay connector terminal 30 and the battery.
Is the repair complete?		 - System OK -
46 Repair the open wire between the cooling fan control relay connector terminal 85 and the ignition switch.
Is the repair complete?		 - System OK -
47 Repair the open wire between the cooling fan control relay connector terminal 87 and ground.
Is the repair complete?		 - System OK -
48 Repair the open wire between the high speed cooling fan relay connector terminal 87 and the main cooling fan connector terminal 2.
Is the repair complete?		 - System OK -
49 Repair the open wire between the cooling fan control relay connector terminal 86 and the ECM connector terminal A51.
Is the repair complete?		 - System OK -
scientia non olet · About LEMON Manuals