( TL19E00G10110249112FAAT00 )

Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting

NOTE:

- Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom troubleshooting index.
- Before performing symptom troubleshooting, check for powertrain DTCs, R20A3 engine model, K24Z3 engine model.

1. Check the No. 3−6 (MAIN FAN MTR) (30 A) fuse in the under-hood fuse/relay, and the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box.

Are you fuses OK?

YES | - | Go to Step 2 .
NO | - | Replace the fuse(s), and recheck. If the fuse(s) blow again, check for a short in the No. 3−6 (MAIN FAN MTR) (30 A) fuse and the No. 16 (7.5 A) fuse circuits.■

1. Remove the radiator fan relay from the under-hood fuse/relay box, and test it.

Is the relay OK?

YES | - | Go to Step 3 .
NO | - | Replace the radiator fan relay .■

1. Measure the voltage between the radiator fan relay 4P socket No. 1 terminal and body ground.

Is there battery voltage?

YES | - | Go to Step 4 .
NO | - | Replace the under-hood fuse/relay box. ■

1. Connect the radiator fan relay 4P socket No. 1 and No. 2 terminals with a jumper wire.

Does the radiator and A/C condenser fans run on low?

YES | - | Go to Step 5 .
NO | - | Go to Step 14 .

1. Disconnect the jumper wire.

1. Turn the ignition switch to ON (II).

1. Measure the voltage between the radiator fan relay 4P socket No. 4 terminal and body ground.

Is there battery voltage?

YES | - | Go to Step 8 .
NO | - | Go to Step 32 .

1. Turn the ignition switch to LOCK (0).

1. Reinstall the radiator fan relay.

1. Jump the SCS line with the HDS.
   NOTE: This step must be done to protect the engine/powertrain control module (ECM/PCM) from damage.

1. Disconnect ECM/PCM connector A (44P) (R20A3 engine model) or ECM/PCM connector A (49P) (K24Z3 engine model).

1. Connect the ECM/PCM connector A (44P) No. 4 terminal (R20A3 engine model) or ECM/PCM connector A (49P) No. 5 terminal (K24Z3 engine model) to body ground with a jumper wire.

1. Turn the ignition switch to ON (II).

Do the radiator and A/C condenser fans run on low?

YES | - | Check for loose wires or poor connections at ECM/PCM connector A (44P) No. 4 terminal (R20A3 engine model) or ECM/PCM connector A (49P) No. 5 terminal (K24Z3 engine model). If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM/PCM, R20A3 engine model, K24Z3 engine model. ■
NO | - | Repair open in the wire between the radiator fan relay and the ECM/PCM.■

1. Disconnect the jumper wire.

1. Reinstall the radiator fan relay.

1. Disconnect the radiator fan 2P connector.

1. Turn the ignition switch to ON (II), then set the A/C button and fan control button ON.

1. Measure the voltage between the radiator fan 2P connector No. 2 terminal and body ground.

Is there battery voltage?

YES | - | Go to Step 19 .
NO | - | Repair open in the wire between the radiator fan relay and the radiator fan.■

1. Set the A/C button and fan control button OFF, then turn the ignition switch to LOCK (0).

1. Reconnect the radiator fan 2P connector.

1. Connect the radiator fan 2P connector No. 1 terminal to body ground with a jumper wire.

1. Turn the ignition switch to ON (II), then set the A/C button and fan control button ON.

Does the A/C condenser fan run at high speed?

YES | - | Go to Step 23 .
NO | - | Replace the radiator fan motor. ■

1. Set the A/C button and fan control button to OFF, then turn the ignition switch to LOCK (0).

1. Disconnect the jumper wire.

1. Remove the relay circuit board from the under-hood fuse/relay box, and test the fan control relay.

Is the relay OK?

YES | - | Go to Step 26 .
NO | - | Replace the relay circuit board.■

1. Check for continuity between under-hood fuse/relay box connector B (14P) No. 11 terminal and the radiator fan 2P connector No. 1 terminal.

Is there continuity?

YES | - | Go to Step 27 .
NO | - | Repair open in the wire between the under-hood fuse/relay box and the radiator fan.■

1. Reconnect under-hood fuse/relay box connector B (14P) and the radiator fan 2P connector.

1. Disconnect the A/C condenser fan 2P connector.

1. Turn the ignition switch to ON (II), then set the A/C button and fan control button ON.

1. Measure the voltage between the A/C condenser fan 2P connector No. 2 terminal and body ground.

Is there battery voltage?

YES | - | Go to Step 31 .
NO | - | Repair open in the wire between the fan control relay and the A/C condenser fan.■

1. Measure the voltage between the A/C condenser fan 2P connector No. 1 and No. 2 terminals.

Is there battery voltage?

YES | - | Replace the A/C condenser fan motor. ■
NO | - | Check for an open in the wire between the A/C condenser fan and body ground. If the wire is OK, check for poor ground at G301, LHD model, RHD model. ■

1. Turn the ignition switch to LOCK (0).

1. Remove the relay circuit board.

1. Using the diode setting ( ) on a DVOM, check for current flow in both directions between relay circuit board connector B (14P) No. 2 and No. 10 terminals.

Is there current flow in only one direction?

YES | - | Go to Step 35 .
NO | - | Replace the relay circuit board.■

1. Turn the ignition switch to ON (II).

1. Measure the voltage between under-hood fuse/relay box connector B (14P) No. 2 terminal and body ground.

Is there battery voltage?

YES | - | Replace the under-hood fuse/relay box. ■
NO | - | Repair open in the wire between the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box and under-hood fuse/relay box.■