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1 Page 1 of PCED Gasoline Engines SECTION 5: Pinpoint Tests Procedure revision date: 03/30/2005 KN: Variable Speed Electric Cooling Fan KN: Introduction KN1 KOEO DTC P0480: CHECK THE B+ AND GND CIRCUIT FOR AN OPEN IN THE HARNESS CF Motor Connector, Harness Side GO to KN3. GO to KN2. KN2 CHECK VOLTAGE TO FAN MOTOR USING CHASSIS GROUND AS A REFERENCE B+ Open GND harness circuit KN3 CHECK THE CIRCUIT(S) Connect the 1.6K ohms resistor between the and B+ circuits at the CF harness connector (this simulates cooling fan circuitry). Check for KOEO DTCs: Is DTC P0480 present? GO to KN4. INSTALL a new cooling fan motor. KN4 CHECK THE CIRCUIT FOR A SHORT TO POWER IN THE HARNESS PCM connector disconnected. Is the voltage less than 1 V? GO to KN5. REPAIR the short circuit. KN5 CHECK THE CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS Is the resistance greater than 10K ohms? GO to KN6. REPAIR the short circuit.

2 Page 2 of 5 KN6 CHECK FOR AN OPEN CIRCUIT BETWEEN PCM & ( + ) PCM Connector, Harness Side ( - ) CF Motor Connector, Harness Side Is the resistance less than 5 ohms? INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). KN7 CONTINUOUS MEMORY DTC P0480: CHECK THE B+ & GND CIRCUIT FOR AN INTERMITTENT CONCERN CF Motor Connector, Harness Side Observe the test lamp for an indication of a fault while completing the following. te that the lamp turns Off when a fault is detected. Shake, wiggle, and bend the B+ and GND circuits to the CF. Shake, wiggle, and bend the associated fuse. ISOLATE the fault and REPAIR as necessary. GO to KN8. KN8 CHECK THE CIRCUIT(S) FOR INTERMITTENT CONCERNS Connect the 1.6 K ohms resistor between the and B+ circuits at the CF harness connector (this simulates cooling fan circuitry). Enter output test mode. Refer to Section 2, Output Test Mode (OTM). Command the low speed fan ON. Observe the DMM for an indication of a fault while completing the following. te that voltage changes suddenly when a fault is detected. Shake, wiggle, and bend the circuit between the CF motor and the PCM. ISOLATE the fault and REPAIR as necessary. GO to Z1. KN9 COOLING FAN MOTOR DOES NOT OPERATE (WITH NO DTCS): COMMAND THE FAN ON TO CHECK OPERATION Carry out the KOEO self-test. Listen to the fan. Does the fan operate sometime during the KOEO self-test? Concern is elsewhere. RETURN to Section 3, Symptom Charts for further direction. GO to KN10. KN10 CHECK THE B+ AND GND TO COOLING FAN MOTOR B+ & GND CF Motor Connector, Harness Side

3 Page 3 of 5 INSTALL a new cooling fan motor. GO to KN11. KN11 CHECK VOLTAGE TO COOLING FAN USING CHASSIS GROUND AS A REFERENCE B+ KN12 KOEO DTC P0480: CHECK THE B+ AND GND TO COOLING FAN MOTOR CF Motor Connector, Harness Side GO to KN14. GO to KN13. KN13 CHECK VOLTAGE TO FAN MOTOR USING CHASSIS GROUND AS A REFERENCE B+ Open GND harness circuit KN14 CHECK THE VPWR VOLTAGE TO CF VPWR GO to KN15. KN15 CHECK THE CIRCUIT(S) TO THE FAN Connect the 1.6 K ohms resistor between the and B+ circuits at the CF harness connector (this simulates cooling fan circuitry). Carry out the KOEO self-test. Is DTC P0480 present? GO to KN16. INSTALL a new cooling fan motor.

4 Page 4 of 5 KN16 CHECK THE CIRCUIT FOR A SHORT TO POWER IN THE HARNESS PCM connector disconnected. Is the voltage less than 1 V? GO to KN17. REPAIR the short circuit. KN17 CHECK THE CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS Is the resistance greater than 10K ohms? GO to KN18. REPAIR the short circuit. KN18 CHECK THE CIRCUIT FOR AN OPEN IN THE HARNESS PCM Connector, Harness Side Is the resistance less than 5 ohms? INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). KN19 CONTINUOUS MEMORY DTC P0480: CHECK THE B+ & GND FOR AN INTERMITTENT CONCERN CF Motor Connector, Harness Side Observe the test lamp for an indication of a fault while completing the following. te that the lamp turns Off when a fault is detected. Shake, wiggle, and bend the B+ and GND circuits to the CFM. Lightly tap on the associated FUSE to simulate road shock. ISOLATE the fault and REPAIR as necessary. GO to KN20. KN20 CHECK THE VPWR CIRCUIT(S) FOR INTERMITTENT CONCERNS VPWR Observe the test lamp for an indication of a fault while completing the following. te that the lamp turns off when a fault is detected. Shake, wiggle, and bend the VPWR circuit(s).

5 Page 5 of 5 ISOLATE the fault and REPAIR as necessary. GO to KN21. KN21 CHECK THE CIRCUIT(S) FOR INTERMITTENT CONCERNS Connect the 1.6 K ohms resistor between the and B+ circuits at the CF harness connector (this simulates cooling fan circuitry). Enter output test mode. Refer to Section 2, Output Test Mode (OTM). Command the low speed fan ON. Check DMM for an indication of a fault while completing the following. The voltage changes suddenly when a fault is detected. Shake, wiggle, and bend the circuit between the CF motor and the PCM. ISOLATE the fault and REPAIR as necessary. GO to Z1.

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