P1500
DTC P15OORADIATOR FAN RELAY 1 CIRCUIT MALFUNCTION (FAN - 1)
Description
- The engine cooling system consists of a down-flow radiator which features high heat-dissipation performance, an electric motor fan, an engine coolant pump, a thermostat, and an engine coolant temperature sensor.
- The "ON"/"OFF" control of the radiator Fan is governed by the Engine Control Module (ECM) which receives signals sent from the engine coolant temperature sensor. On models which are equipped with an air conditioning system, the ECM receives signals sent from the engine coolant temperature Sensor, vehicle speed sensor 2 and A/C switch. These signals simultaneously turn "ON" or "OFF" the radiator main fan and radiator sub fan as well as setting them at "HI" or "LO" speed.
DTC Detecting Condition
Two consecutive trips with fault.
Trouble Symptom
- Radiator fan does not operate properly.
- Overheating.
1. Check output signal from ECM.
a. Turn ignition switch to "OFF".
b. Connect test mode connector at the lower portion of instrument panel (on the driver's side), to the side of the center console box.
c. Turn ignition switch to "ON".
d. Measure voltage between ECM and body.
[CHECK]: Connector & terminal:
(B84) No. 77 - Body/1O Volts, or more and 1.0 Volts or less at every 2 seconds.
[YES]: Go to step 6.
[NO]: Go to next [CHECK].
[CHECK]: Connector & terminal:
(B84) No. 88 - Body/1O Volts or more.
[YES]: Go to step 5.
[NO]: Go to step 2.
2. Check power supply for relays.
- Turn ignition switch to "OFF".
[CHECK]: Is the fuse in power supply circuit broken?
[YES]: Replace the fuse.
[NO]: Go to step 3.
3. Check main fan relay 1, sub fan relay 1, and main fan relay.
a. Remove main fan relay 1. (With A/C models only)
b. Measure resistance between main fan relay 1 terminals.
[CHECK]: Terminal:
No.1-No. 3/97 ±10 Ohms.
[YES]: Go to next step.
[NO]: Replace Main Fan Relay 1.
c. Remove sub fan relay 1. (With A/C models only)
Remove main fan relay. (Without A/C models only)
d. Measure resistance between sub fan relay 1 or main fan relay terminals.
[CHECK]: Terminal:
No. 1 - No. 3/100 ± 17 Ohms.
[YES]: Go to step 4.
[NO]: Replace sub fan relay 1.
4. Check harness connector.
a. Disconnect connector from ECM.
b. Disconnect connector from sub fan relay 1 or main fan relay.
c. Check if the harness connector is open circuit or has poor contact with the following circuits.
[CHECK]: Connector & terminal:
(B84) No. 88 - (F28) No. 3/10 Ohms or less.
NOTE: With A/C models only.
[YES]: Go to next [CHECK].
[NO]: Repair open circuit of harness between ECM connector and main fan relay 1 connector.
[CHECK]: Is there poor contact in ECM or main fan relay 1 connector?
[YES]: Repair ECM or main fan relay 1 connector.
[NO]: Go to next [CHECK].
[CHECK]: Connector & terminal:
(B84) No. 88 - (F40) No. 4/10 Ohms or less.
[YES]: Go to next [CHECK].
[NO]: Repair open circuit of harness between ECM connector and Sub Fan Relay 1 (with A/C models) or Main Fan Relay (without A/C models) connector.
[CHECK]: Is there poor contact in ECM or Sub Fan Relay 1 (with A/C models) or Main Fan Relay (without A/C models) connector?
[YES]: Repair ECM or Sub Fan Relay 1 (with A/C models) or Main Fan Relay (without A/C models) connector.
[NO]: Go to next [CHECK].
[CHECK]: Connector & terminal:
(F28) No. 1 - (B72) No. 5/10 Ohms or less.
[YES]: Go to next [CHECK].
[NO]: Repair open circuit of harness between Main Fan Relay 1 connector and Ignition Switch connector.
[CHECK]: Is there poor contact in Main Fan Relay 1 or Ignition Switch connector?
[YES]: Repair Main Fan Relay 1 or Ignition Switch connector.
[NO]: Go to next [CHECK].
NOTE: With A/C models only.
[CHECK]: Connector & terminal:
(B52) No. 4 - (B72) No. 2/10 Ohms, or less.
[YES]: Go to next [CHECK].
[NO]: Repair open circuit of harness between sub fan relay 1 (with a/c models) or main fan relay (without a/c models) connector and ignition switch connector.
[CHECK]: Is there poor contact in sub fan relay 1 (with A/C models) or main fan relay (without A/C models) or ignition switch connector?
[YES]: Repair sub fan relay 1 (with A/C models) or main fan relay (without A/C models) or ignition switch connector.
[NO]: Replace ECM with a new one.
5. Check harness connector.
a. Turn ignition switch to "OFF".
b. Remove main fan relay 1 and sub fan relay 1. (with A/C models)
Remove main fan relay. (without A/C models)
c. Disconnect test mode connector.
d. Turn ignition switch to "ON".
e. Measure voltage between ECM and body.
[CHECK]: Connector & terminal
(B84) No. 88 - Body/10 Volts or more.
[YES]: Repair short circuit of harness and replace ECM.
[NO]: Go to next
[CHECK]: Is there poor contact in ECM connector?
[YES]: Repair poor contact in ECM connector.
[NO]: Replace ECM.
6. Check monitor line.
a. Turn Ignition Switch to "OFF".
b. Connect test mode connector.
c. Turn Ignition Switch to "ON".
d. Measure voltage between ECM and body.
[CHECK]: Connector & terminal
(B84) No. 77 - Body/10 Volts, or more and 1 Volt, or less at every 2 seconds.
[YES]: Repair poor contact in ECM connector.
[NO]: Repair open circuit of harness between ECM connector and body.