LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2007 >> Reno Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine - Diagnostic Introduction >> Engine Cooling Fan Circuit Check - Dual Fan >> Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine Cooling Fan Circuit Check - Dual Fan: Troubleshooting

TROUBLESHOOTING CHART

Step Action Value (s) Yes No
1 Perform an ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK .
Is the check completed?		 - Go to Step 2 Go to ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK 
2
  1. Check the engine fuse block fuse Ef6.
  2. Replace the fuse as needed.

Is the fuse OK?		 - Go to Step 3 Go to Diagnostic Aids 
3
  1. Check the I/P fuse block fuse Ef11.
  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. The cooling fans should run at low speed when the coolant temperature reaches 97°C (207°F).

Do the cooling fans run at low speed?		 - 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 101°C (214°F).

Do the cooling fans run at high speed?		 - 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 1,882 kPa (273 psi).

Do the cooling fans run at high speed?		 - Go to Step 10 -
10
  1. Turn the ignition OFF.
  2. Connect a scan tool to the DLC.
  3. The coolant temperature should be above 97°C (207°F).
  4. Disconnect the main cooling fan connector.
  5. Turn the ignition ON.
  6. Connect a test light between the main 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 97°C (207°F).
  4. Disconnect the main cooling fan connector.
  5. Connect a test light between the main cooling fan connector terminal 1 and ground.

Is the test light ON?		 - Go to Step 28 Go to Step 17
12
  1. Turn the ignition OFF.
  2. Disconnect the cooling fan relay Low.
  3. Connect a test light between the cooling fan relay Low 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 cooling fan relay Low.
  3. Disconnect Engine Control Module (ECM) white connector.
  4. Connect a fused jumper between the ECM connector terminal C50 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 C50.
Is the problem found?		 - Go to Step 25 Go to Step 15
15
  1. Turn the ignition OFF.
  2. Disconnect the cooling fan relay Low.
  3. Connect a test light between the cooling fan relay Low 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 cooling fan relay Low 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 cooling fan relay Low connector terminals 30 and 87.
  3. Connect a fused jumper between the cooling fan control relay connector terminals 30 and 87.

Do the cooling fans run at low speed?		 - Go to Step 27 Go to Step 18
18 Check the wire between the cooling fan relay Low connector terminal 87 to the main cooling fan connector terminal 2 for an open.
Is the problem found?		 - Go to Step 22 Go to Step 19
19 Check the wire between the main 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 auxiliary 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 auxiliary 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 cooling fan relay Low connector terminal 30 and the fuse Ef6.
Is the repair complete?		 - System OK -
24 Repair the open between the cooling fan relay Low connector terminal 86 and the ignition switch.
Is the repair complete?		 - System OK -
25 Repair the open wire between the cooling fan relay Low connector terminal 85 and the ECM connector terminal C50.
Is the repair complete?		 - System OK -
26 Replace the cooling fan relay Low.
Is the repair complete?		 - System OK -
27 Replace the cooling fan control relay.
Is the repair complete?		 - System OK -
28 Replace the main cooling fan.
Is the repair complete?		 - System OK -
29 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 main cooling fan connector.
  3. Connect a test light between the main 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 B (+).
  3. Turn the A/C switch ON.
  4. Start the engine.

Is the test light ON?		 - Go to Step 28 Go to Step 17
33
  1. Turn the ignition OFF.
  2. Disconnect the cooling fan relay Hi.
  3. Connect a test light between the cooling fan relay Hi connector terminal 86 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 cooling fan relay Hi 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 B (+).

Is the test light ON?		 - Go to Step 37 Go to Step 47
37
  1. Connect the main cooling fan connector.
  2. Connect the cooling fan relay Hi.
  3. Connect the cooling fan control relay.
  4. Disconnect the ECM connector.
  5. Connect a fused jumper between the ECM connector terminal C50 and ground.
  6. Connect a fused jumper between the ECM connector terminal E34 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 cooling fan relay Hi connector terminal 85 and the ECM connector terminal E34.

Is the problem found?		 - Go to Step 22 Go to Step 39
39
  1. Disconnect the cooling fan relay Hi.
  2. Connect a test light between the cooling fan relay Hi connector terminal 87 and B (+).

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 E34 and ground.
  3. Disconnect the cooling fan relay Hi.
  4. Connect a test light between the cooling fan control relay connector terminal 86 and B (+).

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 E34 and ground.
  3. Disconnect the cooling fan relay Hi.
  4. Connect a fused jumper between the cooling fan relay Hi 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 E34 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 cooling fan relay Hi.
Is the repair complete?		 - System OK -
44 Repair the open wire between the cooling fan relay Hi connector terminal 86 and the ignition switch.
Is the repair complete?		 - System OK -
45 Repair the open wire between the cooling fan relay Hi 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 cooling fan relay Hi connector terminal 87 and the auxiliary cooling fan connector terminal 2.
Is the repair complete?		 - System OK -
49 Repair the open wire between the cooling fan control relay connector terminal 85 and the ECM connector terminal E34.
Is the repair complete?		 - System OK -
scientia non olet · About LEMON Manuals