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Pinpoint Test 5: The Block Heater Does Not Operate Correctly

NOTE:
  • Before carrying out the following test, diagnose any PCM DTCs.
PINPOINT TEST 5: BLOCK HEATER DOES NOT OPERATE CORRECTLY

PINPOINT TEST 5 THE ELECTRIC COOLING FAN(S) IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - 3.0L
STEP INSPECTION ACTION
1 CHECK LOW SPEED OPERATION OF THE ELECTRIC COOLING FANS
  • Key ON, Engine OFF (KOEO).
  • Connect the WDS or equivalent tester.
  • Using the WDS or equivalent tester, command the cooling fans ON in low speed.
  • Do both cooling fans operate correctly in low speed? 
 Yes Go to next step.
No If both fans are inoperative in low speed and the RH fan is inoperative in high speed, Go to step 5. If both fans are inoperative in low speed and both fans operate in high speed, REPAIR circuit (LB/B) for an open. TEST the system for normal operation. If both fans are inoperative in low speed and the LH fan is inoperative in high speed, Go to step 3.
2 CHECK CIRCUIT (B) FOR AN OPEN
  • Key OFF.
  • Disconnect the Cooling Fan High Speed Relay 2.
  • Measure the resistance between the high speed cooling fan relay 2 pin 30, circuit (B) and ground.
  • Is the resistance less than 5 ohms? 
 Yes CARRY OUT the relay component test on cooling fan high speed relay 2. If the relay tests good, REPAIR circuit (LB/B) for an open. TEST the system for normal operation.
No REPAIR circuit (B) for an open. TEST the system for normal operation.
3 CHECK CIRCUIT (B) FOR AN OPEN
  • Key OFF.
  • Disconnect the LH Cooling Fan Motor connector 0112-01.
  • Measure the resistance between the LH cooling fan motor connector 0112-01 pin 3, circuit (B) and ground.
  • Is the resistance less than 5 ohms? 
 Yes Go to next step.
No REPAIR circuit (B) for an open. TEST the system for normal operation.
4 CHECK CIRCUIT (GY/R) FOR AN OPEN
  • Disconnect the Cooling Fan High Speed Relay 1.
  • Measure the resistance between the LH cooling fan motor connector 0112-01 pin 1, circuit (GY/R) and high speed cooling fan relay 1, pin 30, circuit (GY/R).
  • Is the resistance less than 5 ohms? 
 Yes INSTALL a new LH cooling fan motor. TEST the system for normal operation.
No REPAIR circuit (GY/R) for an open. TEST the system for normal operation.
5 CHECK CIRCUIT (B/LG) FOR VOLTAGE
  • Key OFF.
  • Disconnect the Cooling Fan Low Speed Relay.
  • Measure the voltage between the low speed cooling fan relay pin 87, circuit (B/LG) and ground.
  • Is the voltage greater than 10 volts? 
 Yes Go to next step.
No REPAIR circuit (B/LG) for an open. TEST the system for normal operation.
6 CHECK CIRCUIT (R/O) FOR AN OPEN
  • Disconnect the RH Cooling Fan Motor connector 0112-02.
  • Measure the resistance between the RH cooling fan motor connector 0112-02 pin 1, circuit (R/O) and low speed cooling fan relay pin 30, circuit (R/O).
  • Is the resistance less than 5 ohms? 
 Yes CARRY OUT the relay component test on cooling fan low speed relay. If the relay tests good, Go to next step.
No REPAIR circuit (R/O) for an open. TEST the system for normal operation.
7 CHECK CIRCUIT (LB/B) FOR AN OPEN
  • Disconnect the Cooling Fan High Speed Relay 2.
  • Measure the resistance between the RH cooling fan motor connector 0112-02 pin 3, circuit (LB/B) and high speed cooling fan relay 2, pin 87, circuit (LB/B).
  • Is the resistance less than 5 ohms? 
 Yes INSTALL a new RH cooling fan motor. TEST the system for normal operation.
No REPAIR circuit (LB/B) for an open. TEST the system for normal operation.
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