Cooling System: Diagnosis Saab 9-5 II

Diagnostic Instructions

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0480

Cooling Fan Relay 1 Control Circuit

DTC P0481

Cooling Fan Relays 2 and 3 Control Circuit

Cooling Fan Relay 1, and Cooling Fan Relays 2 and 3 Control Circuit Open, Low Voltage, and High Voltage Test Status

Conditions for Running the DTC

1. The ignition voltage is between 11-32 V.
2. The engine speed is greater than 400 RPM.
3. The ECM driver transitions from ON to OFF or from OFF to ON.
4. DTC P0480 and P0481 run continuously when the conditions above are met.

Conditions for Setting the DTC

P0480

The commanded state of the ECM driver and the actual state of the control circuit do not match for greater than 5 seconds.

P0481

The commanded state of the ECM driver and the actual state of the control circuit do not match for greater than 5 seconds.

Action Taken When the DTC Sets

DTCs P0480 and P0481 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0480 and P0481 are Type B DTCs.

Diagnostic Aids

1. The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the fan control command parameters on the scan tool to know which fans are being commanded ON by the ECM.
2. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a medium speed Cooling Fan Relays 2 and 3 operates both fans at a low speed Cooling Fan Relays 1, 2 and 3 operates both fans at a high speed
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.
4. A condition with the powertrain relay may set DTC P0481 or P0693.

DTC Type Reference

POWERTRAIN DIAGNOSTIC TROUBLE CODE (DTC) TYPE DEFINITIONS

Scan Tool Reference

CONTROL MODULE REFERENCES for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the KR20 cooling fan relays listed below: KR20F cooling fan relay KR20C cooling fan low speed relay KR20D cooling fan high speed relay
2. Ignition ON, connect a test lamp between ground and the relay coil ignition voltage circuit terminal listed below. The test lamp should turn ON. KR20F cooling fan relay terminal 85 KR20C cooling fan low speed relay terminal 86
3. If the test lamp does not illuminate, test the relay coil ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay coil ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.
4. NOTE: The following tests must be performed on all three fan relay control circuits. Connect the red lead of the DMM to a control circuit terminal listed below. Connect the black lead to ground. Set the DMM on the diode setting. The DMM should display OL. KR20F cooling fan relay terminal 86 KR20C cooling fan low speed relay terminal 85 KR20D cooling fan high speed relay terminal 85
5. If less than the specified range, test the appropriate relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
6. NOTE: The following test must be performed on all three fan relay circuits. Command the cooling fan relay ON and OFF with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON.
7. If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the K20 ECM.
8. If all circuits test normal, test or replace the appropriate KR20 relay.

Component Testing

1. Ignition OFF, disconnect the cooling fan relay.
2. Test for 70-110 ohms between terminals 85 and 86.
3. If not within the specified range, replace the KR20 cooling fan relay.
4. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If less than the specified range, replace the KR20 cooling fan relay.
5. Install a 20 A fused jumper wire between relay terminal 85 and B+. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
6. If greater than the specified range, replace the KR20 cooling fan relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC P0480 00

Cooling Fan Relay 1 Control Circuit

DTC P0481 00

Cooling Fan Relay 2 Control Circuit

DTC P0691 00

Cooling Fan Relay 1 Control Circuit Low Voltage

DTC P0692 00

Cooling Fan Relay 1 Control Circuit High Voltage

DTC P0693 00

Cooling Fan Relay 2 Control Circuit Low Voltage

DTC P0694 00

Cooling Fan Relay 2 Control Circuit High Voltage

1. The engine speed is greater that 40 RPM.
2. The ignition voltage is between 8-16 V.
3. The ECM driver transitions from ON to OFF or from OFF to ON.

P0480 00

The ECM detects an open on the low speed cooling fan relay control circuit for more than 0.5 s.

P0481 00

The ECM detects an open circuit on the high speed cooling fan relay control circuit for more than 0.5 s.

P0691 00

The ECM detects a short to ground on the low speed cooling fan relay control circuit for more than 0.5 s.

P0692 00

The ECM detects a short to voltage on the low speed cooling fan relay control circuit for more than 0.5 s.

P0693 00

The ECM detects a short to ground on the high speed cooling fan relay control circuit for more than 0.5 s.

P0694 00

The ECM detects a short to voltage on the high speed cooling fan relay control circuit for more than 0.5 s.

1. DTCs P0480 00, P0481 00, P0691 00, P0692 00, P0693 00, and P0694 00 are Type C DTCs.
2. The service vehicle soon indicator will illuminate.

Conditions for Clearing the DTC

DTCs P0480 00, P0481 00, P0691 00, P0692 00, P0693 00, and P0694 00 are Type C DTCs.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20A Cooling Fan Medium Speed 1 Relay, or KR20B Cooling Fan Medium Speed 2 Relay.
2. Ignition ON, verify that a test lamp illuminates between the KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20B Cooling Fan Medium Speed 2 Relay coil ignition circuit terminal 85 and ground, or KR20A Cooling Fan Medium Speed 1 Relay coil ignition circuit terminal 3 and ground.
3. If the test lamp does not illuminate, test the KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20A Cooling Fan Medium Speed 1 Relay, or KR20B Cooling Fan Medium Speed 2 Relay coil ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20A Cooling Fan Medium Speed 1 Relay, or KR20B Cooling Fan Medium Speed 2 Relay coil ignition circuit fuses F42, F45, or F46 for an open, test all components connected to the ignition circuit and repair and replace as necessary.
4. Connect a test lamp between the KR20F Cooling Fan Relay, KR20D Cooling Fan High Speed Relay coil control circuit terminal 86 and B+, or KR20A Cooling Fan Medium Speed 1 Relay coil control circuit terminal 2 and B+.
5. Command the Cooling Fan Relay 1 Command, or Cooling Fan Relay 2 Command ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states for the appropriate relay.
6. If the test lamp is always ON, test the KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20A Cooling Fan Medium Speed 1 Relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
7. If the test lamp is always OFF, test the relay coil control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
8. If all circuits test normal, test or replace the KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20A Cooling Fan Medium Speed 1 Relay, or KR20B Cooling Fan Medium Speed 2 Relay.

Relay Test

1. Ignition OFF, disconnect the KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20A Cooling Fan Medium Speed 1 Relay, or KR20B Cooling Fan Medium Speed 2 Relay.
2. Measure for 70-110 ohms between terminals 85 and 86 of the KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20B Cooling Fan Medium Speed 2 Relay, or terminals 1 and 2 of the KR20A Cooling Fan Medium Speed 1 Relay.
3. If the resistance is not within the specified range, replace the appropriate KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20A Cooling Fan Medium Speed 1 Relay, or KR20B Cooling Fan Medium Speed 2 Relay.
4. Measure for infinite resistance between following terminals of the appropriate KR20F Cooling Fan Relay, KR20D Cooling Fan High Speed Relay, KR20B Cooling Fan Medium Speed 2 Relay, or KR20A Cooling Fan Medium Speed 1 Relay: Terminals 30 and 86 KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, and KR20B Cooling Fan Medium Speed 2 Relay Terminals 30 and 87 KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, and KR20B Cooling Fan Medium Speed 2 Relay Terminals 30 and 85 KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, and KR20B Cooling Fan Medium Speed 2 Relay Terminals 85 and 87 KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, and KR20B Cooling Fan Medium Speed 2 Relay Terminals 3 and 2 KR20A Cooling Fan Medium Speed 1 Relay Terminals 3 and 5 KR20A Cooling Fan Medium Speed 1 Relay Terminals 3 and 1 KR20A Cooling Fan Medium Speed 1 Relay Terminals 1 and 5 KR20A Cooling Fan Medium Speed 1 Relay If continuity is detected, replace the appropriate KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20A Cooling Fan Medium Speed 1 Relay, or KR20B Cooling Fan Medium Speed 2 Relay.
5. Connect a 20 A fused jumper wire from the positive terminal of the battery to the appropriate KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20B Cooling Fan Medium Speed 2 Relay, terminal 85 or KR20A Cooling Fan Medium Speed 1 Relay. Connect a jumper wire from the negative terminal of the battery to KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, and KR20B Cooling Fan Medium Speed 2 Relay, terminal 86 or KR20A Cooling Fan Medium Speed 1 Relay terminal 2. Measure for less than 5 ohms between KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, and KR20B Cooling Fan Medium Speed 2 Relay terminal 30 and terminal 87 or KR20A Cooling Fan Medium Speed 1 Relay terminal 3 and terminal 5.
6. If the resistance measures more than 5 ohms, replace the appropriate KR20F Cooling Fan Relay, KR20E Cooling Fan Speed Control Relay, KR20D Cooling Fan High Speed Relay, KR20A Cooling Fan Medium Speed 1 Relay, or KR20B Cooling Fan Medium Speed 2 Relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC P0480

Cooling Fan Relay 1 Control Circuit

DTC P0481

Cooling Fan Relays 2 and 3 Control Circuit

DTC P0691

Cooling Fan Relay 1 Control Circuit Low Voltage

DTC P0692

Cooling Fan Relay 1 Control Circuit High Voltage

DTC P0693

Cooling Fan Relays 2 and 3 Control Circuit Low Voltage

DTC P0694

Cooling Fan Relays 2 and 3 Control Circuit High Voltage

1. The ignition voltage is between 10-26 volts.
2. The engine speed is more than 80 RPM.
3. The ECM driver transitions from ON to OFF or from OFF to ON.
4. DTC P0480, P0481, P0691, P0692, P0693, and P0694 run continuously when the conditions above are met.

P0480

The ECM detects an open in the cooling fan relay 1 control circuit for greater than 1.5 S.

P0481

The ECM detects an open in the cooling fan relay 2 and 3 control circuit for greater than 1.5 S.

P0691

The ECM detects a short to ground in the cooling fan relay 1 control circuit for greater than 1.5 S.

P0692

The ECM detects a short to voltage in the cooling fan relay 1 control circuit for greater than 1.5 S.

P0693

The ECM detects a short to ground in the cooling fan relay 2 and 3 control circuit for greater than 1.5 S.

P0694

The ECM detects a short to voltage in the cooling fan relay 2 and 3 control circuit for greater than 1.5 S.

DTCs P0480, P0481, P0691, P0692, P0693, and P0694 are Type B DTCs.

DTCs P0480, P0481, P0691, P0692, P0693, and P0694 are Type B DTCs.

1. The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the fan control command parameters on the scan tool to know which fans are being commanded ON by the ECM.
2. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a medium speed Cooling Fan Relays 2 and 3 operates both fans at a low speed Cooling Fan Relays 1, 2 and 3 operates both fans at a high speed
3. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.
4. A condition with the powertrain relay may set DTC P0481 or P0693.

POWERTRAIN DIAGNOSTIC TROUBLE CODE (DTC) TYPE DEFINITIONS

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the KR20 cooling fan relays listed below: KR20F cooling fan relay KR20C cooling fan low speed relay KR20D cooling fan high speed relay
2. Ignition ON, connect a test lamp between ground and the relay coil ignition voltage circuit terminal listed below. The test lamp should turn ON. KR20F cooling fan relay terminal 85 KR20C cooling fan low speed relay terminal 86
3. If the test lamp does not illuminate, test the relay coil ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay coil ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.
4. NOTE: The control circuits for the cooling fan relays are pulled-up to a voltage within the ECM, 2.6-4.6 volts on the control circuit is normal. The following tests must be performed on all three fan relay control circuits. Connect the red lead of the DMM to a control circuit terminal listed below. Connect the black lead to ground. Set the DMM on the diode setting. The DMM should display OL. KR20F cooling fan relay terminal 86 KR20C cooling fan low speed relay terminal 85 KR20D cooling fan high speed relay terminal 85
5. If less than the specified range, test the appropriate relay coil control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
6. NOTE: The following test must be performed on all three fan relay circuits. Command the cooling fan relay ON and OFF with a scan tool. The DMM should transition from OL when commanded OFF to less than 1 V when commanded ON.
7. If the circuit voltage does not correspond to the specified values, test the control circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the K20 ECM.
8. If all circuits test normal, test or replace the appropriate KR20 relay.

1. Ignition OFF, disconnect the cooling fan relay.
2. Test for 70-110 ohms between terminals 85 and 86.
3. If not within the specified range, replace the KR20 cooling fan relay.
4. Measure the resistance between the terminals listed below. The DMM should display OL. 30 and 86 30 and 87 30 and 85 85 and 87 If less than the specified range, replace the KR20 cooling fan relay.
5. Install a 20 A fused jumper wire between relay terminal 85 and B+. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
6. If greater than the specified range, replace the KR20 cooling fan relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC P0480 00

Cooling Fan Relay 1 Control Circuit

DTC P0481 00

Cooling Fan Relay 2 Control Circuit

DTC P0482 00

Cooling Fan Relay 3 Control Circuit

DTC P0691 00

Cooling Fan Relay 1 Control Circuit Low Voltage

DTC P0692 00

Cooling Fan Relay 1 Control Circuit High Voltage

DTC P0693 00

Cooling Fan Relay 2 Control Circuit Low Voltage

DTC P0694 00

Cooling Fan Relay 2 Control Circuit High Voltage

DTC P0695 00

Cooling Fan Relay 3 Control Circuit Low Voltage

DTC P0696 00

Cooling Fan Relay 3 Control Circuit High Voltage

1. The ignition voltage is between 8-18 V.
2. The engine is running greater than or equal to 400 RPM.

P0480 00

The ECM detects a malfunction on the cooling fan relay 1 control circuit.

P0481 00

The ECM detects a malfunction on the cooling fan relay 2 control circuit.

P0482 00

The ECM detects a malfunction on the cooling fan relay 3 control circuit.

P0691 00

The ECM detects a short to ground on the cooling fan relay 1 control circuit.

P0692 00

The ECM detects a short to voltage on the cooling fan relay 1 control circuit.

P0693 00

The ECM detects a short to ground on the cooling fan relay 2 control circuit.

P0694 00

The ECM detects a short to voltage on the cooling fan relay 2 control circuit.

P0695 00

The ECM detects a short to ground on the cooling fan 3 control circuit.

P0696 00

The ECM detects a short to voltage on the cooling fan relay 3 control circuit.

DTCs P0691 00, P0692 00, P0693 00, P0694 00, P0695 00 and P0696 00 are Type B DTCs.

DTCs P0691 00, P0692 00, P0693 00, P0694 00, P0695 00 and P0696 00 are Type B DTCs.

POWERTRAIN DIAGNOSTIC TROUBLE CODE (DTC) TYPE DEFINITIONS

CONTROL MODULE REFERENCES for scan tool information

P0480 00, P0691 00 and P0692 00

1. Ignition OFF, disconnect the KR20J Cooling Fan Left High Speed Relay.
2. Ignition ON, verify that a test lamp does not illuminate between the relay coil control circuit terminal 2 and ground.
3. If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
4. Ignition OFF, disconnect the harness connector X2 at the K20 Engine Control Module. Test for an infinite resistance between the relay coil control circuit terminal 2 and ground.
5. If less than the specified value, test the relay coil control circuit for a short to ground.
6. Test for less than 5.0 ohms between relay coil control circuit terminal 2 and K20 Engine Control Module terminal 94 X2.
7. If greater than the specified value, test the relay coil control circuit for an open/high resistance.
8. Test for 70-110 ohms between 85 and 86 of the KR20J Cooling Fan Left High Speed Relay.
9. If the resistance is not within the specified range, replace the KR20J Cooling Fan Left High Speed Relay.
10. If all circuit tests normal, replace the K20 Engine Control Module.

P0481 00, P0693 00 and P0694 00

1. Ignition OFF, disconnect the following cooling fan relay. KR20L Cooling Fan Speed Control 2 Relay KR20G Cooling Fan Left Low Speed Relay KR20H Cooling Fan Right Low Speed Relay
2. NOTE: The following test must performed on all three cooling fan relays. Ignition ON, verify that a test lamp does not illuminate between the relay coil control circuit terminal 85 and ground.
3. If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
4. Ignition OFF, disconnect the K20 Engine Control Module. Test for an infinite resistance between the relay coil control circuit terminal 85 and ground.
5. If less than the specified value, test the relay coil control circuit for a short to ground.
6. Test for less than 5.0 ohms between relay coil control circuit terminal 85 and K20 Engine Control Module terminal 90 X2.
7. If greater than the specified value, test the relay coil control circuit for an open/high resistance.
8. Test for 70-110 ohms between terminals 85 and 86 of the KR20G Cooling Fan Left Low Speed Relay.
9. If the resistance is not within the specified range, replace the KR20G Cooling Fan Left Low Speed Relay.
10. If all circuit tests normal, replace the K20 Engine Control Module.

P0482 00, P0695 00 and P0696 00

1. Ignition OFF, disconnect the KR20A Cooling Fan Medium Speed 1 Relay.
2. Ignition ON, verify that a test lamp does not illuminate between the relay coil control circuit terminal 2 and ground.
3. If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
4. Ignition OFF, disconnect the K20 Engine Control Module. Test for an infinite resistance between the relay coil control circuit terminal 2 and ground.
5. If less than the specified value, test the relay coil control circuit for a short to ground.
6. Test for less than 5.0 ohms between relay coil control circuit terminal 2 and K20 Engine Control Module terminal 91 X2.
7. If greater than the specified value, test the relay coil control circuit for an open/high resistance.
8. Test for 70-110 ohms between terminals 85 and 86 of the KR20A Cooling Fan Medium Speed 1 Relay.
9. If the resistance is not within the specified range, replace the KR20A Cooling Fan Medium Speed 1 Relay.
10. If all circuit tests normal, replace the K20 Engine Control Module.

Dynamic Test

1. Ignition OFF, disconnect the applicable relay.
2. Test for 70-110 ohms between terminals 85 and 86 or 1 and 2 of the relay.
3. If the resistance is not within the specified range, replace the relay.
4. Test for infinite resistance between the following terminals: 30 and 86 or 3 and 1 30 and 87 or 3 and 5 30 and 85 or 3 and 2 85 and 87 or 2 and 5 If not the specified value, replace the relay.
5. Install a 20 A fused jumper wire between relay terminal 85 or 2 and 12 V. Install a jumper wire between relay terminal 86 or 1 and ground. Test for less than 2 ohms between terminals 30 or 3 and 87 or 5.
6. If greater than the specified value, replace the relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC Descriptor

DTC P1484 00

Cooling Fan System Performance

1. The ignition voltage is between 8-18 V.
2. The engine is running greater than or equal to 400 RPM.

The ECM detects an over current at the output powerstage.

DTC P1484 00 is a Type A DTC.

DTC P1484 00 is a Type A DTC.

POWERTRAIN DIAGNOSTIC TROUBLE CODE (DTC) TYPE DEFINITIONS

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the applicable relay.
2. Test for 70-110 ohms between terminals 85 and 86 of the relay.
3. If the resistance is not within the specified range, replace the relay.
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 30 and 86 If not the specified value, replace the relay.
5. Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
6. If more than the specified value, replace the relay.

Important Preliminary Inspections Before Starting

Before using the Symptom diagnosis, perform the following

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) and verify all of the following items: Ensure that the engine control module (ECM) and indicator lamp are operating correctly. Ensure that there are no diagnostic trouble codes (DTCs) that are stored. The scan tool data is within the normal operating range. Refer to «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for scan tool information.
2. Verify the customer concern.
3. Perform the «VISUAL/PHYSICAL INSPECTION»(ref-653648-S30035427262014090100000) in this section. The visual/physical inspection is extremely important, and can lead to correcting a condition without additional testing. It may also help reveal the cause of an intermittent condition.
4. Locate the correct symptom. Perform the tests and inspections associated with the symptom.

Review the system operation in order to familiarize yourself with the system functions. Refer to COOLING FAN DESCRIPTION AND OPERATION (LHU/A20NFT, LAU/A28NER) .

Visual/Physical Inspection

Several of the symptom procedures call for a careful visual and physical inspection. This can lead to correcting a condition without further tests and can save time. This inspection should include the following areas

1. Ensure that the control module grounds are clean, tight, and correctly located.
2. Inspect cooling system hoses and pipes for splits, kinks, and proper connections. Inspect thoroughly for any type of a leak or a restriction.
3. Inspect for a dirty or restricted radiator and HVAC condenser.
4. Inspect for aftermarket devices which could affect the operation of the Cooling System.
5. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
6. Inspect the surge tank reservoir for the proper coolant level.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «ENGINE OVERHEATING»(ref-653648-S31146724822014090100000)
2. «LOSS OF COOLANT»(ref-653648-S03629050042014090100000)
3. «THERMOSTAT DIAGNOSIS»(ref-653648-S38440252342014090100000)
4. «ENGINE FAILS TO REACH NORMAL OPERATING TEMPERATURE»(ref-653648-S32591494202014090100000)

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

Diagnostic Fault Information

Note. Circuit/System Verification must be performed before performing the Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the B33 coolant level switch.
2. Test for less than 5 ohms between the ground circuit terminal 1 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Engine operating, connect a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the low coolant indicator turns OFF.
5. If the indicator does not turn OFF, test the signal circuit for short to ground. If the circuit tests normal, replace the P16 IPC.
6. If all circuits test normal, replace the B33 coolant level switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the appropriate cooling fan relay.
2. Ignition ON, verify that the cooling fan is not ON.
3. If the fan is ON, test for a short to voltage in the relay controlled output circuit terminal 8.
4. If all circuits test normal, test or replace the cooling fan relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of the diagnostic category.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a medium speed Cooling Fan Relay 2 and 3 operates both fans at a low speed Cooling Fan Relay 1, 2 and 3 operates both fans at a high speed
2. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

Note. You must perform the circuit/system verification before proceeding with circuit/system testing.

1. Ignition OFF, disconnect the KR20A Cooling Fan Medium Speed 1 Relay, and KR20B Cooling Fan Medium Speed 2 Relay, and KR20D Cooling Fan High Speed Relay, and KR20F Cooling Fan Relay relays.
2. Ignition ON, observe that the fan is not activated.
3. If the fan is not activated, then replace the faulty KR20A Cooling Fan Medium Speed 1 Relay, or KR20B Cooling Fan Medium Speed 2 Relay, or KR20D Cooling Fan High Speed Relay, or KR20F Cooling Fan Relay.
4. If the fan is activated, then test the fan voltage supply circuits for a short to voltage.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the appropriate cooling fan relay.
2. Ignition ON, verify that the cooling fan is not ON.
3. If the fan is ON, test for a short to voltage in the relay controlled output circuit terminal 8.
4. If all circuits test normal, test or replace the cooling fan relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000) .
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. The scan tool cooling fan output control operates as follows: Cooling Fan Relay 1 operates both fans at a medium speed Cooling Fan Relay 2 and 3 operates both fans at a low speed Cooling Fan Relay 1, 2 and 3 operates both fans at a high speed
2. When disconnecting or removing fuses and relays from a fuse block, always inspect the component electrical terminals for corrosion and the correct orientation in the fuse block. Test the mating electrical terminals for tightness.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connectors, or remove the following components: KR20F Cooling Fan Relay KR20E Cooling Fan Speed Control Relay KR20L Cooling Fan Speed Control 2 Relay G10L Cooling Fan Motor-Left G10R Cooling Fan Motor - Right
2. Connect a test lamp between B+ and circuit terminal of the component listed below. The test lamp should illuminate at each terminal. G10R Cooling Fan ground circuit terminal 3 KR20L Relay switched output circuit terminal 8
3. If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.
4. Connect a test lamp between B+ and the KR20F relay switched output circuit terminal 30. The test lamp should illuminate.
5. If the test lamp does not illuminate, test the output circuit for an open/high resistance.
6. Ignition ON, connect a test lamp between ground and the KR20 relay terminals listed below. The test lamp should illuminate at each terminal. KR20F relay terminal 85 KR20E relay terminal 86 and 30
7. If the test lamp does not illuminate, test the relay coil ignition circuit for an open/high resistance or for a short to ground.
8. Install the KR20F relay.
9. Connect a test lamp between B+ and the KR20E relay coil control circuit terminal 85.
10. Ignition ON, command the cooling fans ON at medium speed with a scan tool. The test lamp should turn ON.
11. If the test lamp does not illuminate, test for an open/high resistance in the relay coil control circuit. If the circuit tests normal, test or replace the KR20F relay.
12. Ignition OFF, install the KR20E relay.
13. Remove the KR20D Cooling Fan High Speed Relay.
14. Connect a test lamp between ground and the KR20D relay coil ignition circuit terminal 86.
15. Ignition ON, command the cooling fans ON at medium speed with a scan tool. The test lamp should turn ON.
16. If the test lamp does not illuminate, test the KR20D relay coil ignition voltage circuit for an open/high resistance. If the circuit tests normal, test or replace the KR20E relay.
17. Ignition OFF, install the KR20D relay.
18. Ignition ON, Connect a test lamp between ground and the G10 cooling fan harness connector terminal listed below. Command the cooling fans ON at high speed with a scan tool. The test lamp should illuminate at each terminal as commanded. G10L Cooling Fan Motor-Left terminal 1 G10R Cooling Fan Motor-Right terminal 1
19. If the test lamp does not illuminate, test the appropriate relay switched output circuit and B+ supply circuit, for a short to ground or an open/high resistance. If the circuits test normal and the B+ supply fuse is OK, test or replace the KR20C Cooling Fan Low Speed Relay or the KR20D Cooling Fan High Speed Relay, as appropriate.
20. If the circuits test normal and the B+ supply fuse is open, test or replace the appropriate G10 cooling fan motor.
21. Ignition OFF, remove the following relays from the underhood relay block X70: KR20M Cooling Fan Left Medium Speed Relay KR20N Cooling Fan Right Medium Speed Relay
22. Ignition ON, connect a test lamp between ground and harness terminal 4 of each relay listed below. The test lamp should illuminate at each terminal. KR20M Cooling Fan Left Medium Speed Relay KR20N Cooling Fan Right Medium Speed Relay KR20L Cooling Fan Speed Control 2 Relay
23. If the test lamp does not illuminate, test the relay coil ignition voltage circuit for an open/high resistance, as appropriate.
24. Connect a test lamp between B+ and harness terminal 6 of each relay listed below. Command the cooling fans ON at medium speed. The test lamp should illuminate at each terminal as commanded. KR20M Cooling Fan Left Medium Speed Relay KR20N Cooling Fan Right Medium Speed Relay KR20L Cooling Fan Speed Control 2 Relay
25. It the test lamp does not illuminate, test the relay coil control circuit for an open/high resistance, as appropriate.
26. Ignition OFF, install the following relays: KR20M Cooling Fan Left Medium Speed Relay KR20N Cooling Fan Right Medium Speed Relay
27. Ignition ON, Connect a test lamp between ground and the G10 cooling fan harness connector terminal listed below. Command the cooling fans ON at medium speed with a scan tool. The test lamp should illuminate at each terminal as commanded. G10L Cooling Fan Motor-Left terminal 2 G10R Cooling Fan Motor-Right terminal 2
28. If the test lamp does not illuminate, test the appropriate relay switched output circuit and B+ supply circuit for an open/high resistance. If the circuits test normal, test or replace the KR20M, or KR20N relay, as appropriate.
29. Ignition OFF, Connect the harness connectors to the G10 cooling fans.
30. NOTE: The jumper wire completes the parallel ground circuit for the left cooling fan. Leave the jumper wire in place until instructed. Connect a 40 A fused jumper wire between terminal 2 and terminal 8 of the KR20L Speed Control 2 Relay harness connector.
31. Ignition ON, command the cooling fans ON at high speed with a scan tool. Both fans should operate at full speed.
32. If the left fan does not operate, test the series/parallel circuit terminal 2 for an open/high resistance. If the circuit tests normal, test or replace the G10L cooling fan motor.
33. If the right fan does not operate, test or replace the G10R cooling fan motor.
34. Command the cooling fans ON at medium speed with a scan tool. Both fans should operate at a medium speed.
35. If either fan is inoperative, replace the appropriate G10 cooling fan motor.
36. Ignition OFF, remove the jumper wire and install the KR20L Speed Control 2 Relay.
37. Ignition ON, command the cooling fans ON at low speed with a scan tool. Both fans should operate at a reduced speed.
38. If both fans are OFF, test the KR20L series circuit terminal 5 for an open/high resistance.
39. If all of the circuits test normal, test or replace the KR20L Speed Control 2 Relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect all five cooling fan relays.
2. Test for less than 5 ohms between the KR20E Cooling Fan Speed Control Relay terminal 8 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. NOTE: The following test must performed on all cooling fan relays. Ignition ON, verify that a test lamp illuminates between each relay switch B+ circuit terminal and ground.
5. If the test lamp does not illuminate, test the relay switch B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay switch B+ circuit fuse is open, test the relay controlled output circuit for a short to ground. If the circuit tests normal, test or replace the appropriate cooling fan motor.
6. Ignition OFF, connect a jumper wire between the KR20E Cooling Fan Speed Control Relay terminal 2 and the relay ground circuit terminal 8.
7. NOTE: The following test must be performed on both cooling fan low speed relays. Connect a 20 A fused jumper between the cooling fan low speed relay switch B+ circuit terminal 2 and the relay controlled output circuit terminal 8. Ignition ON, verify the cooling fan is activated.
8. If the fan does not activate, test the following conditions and repair as necessary. Relay controlled output circuit for a short to ground or an open/high resistance Open cooling fan resistor Open circuit between the G10L Cooling Fan Motor - Left terminal 3 and the KR20E Cooling Fan Speed Control Relay terminal 2 Fan ground circuit for an open/high resistance Cooling fan motor
9. NOTE: The following test must be performed on both cooling fan high speed relays. Ignition OFF, remove the low speed fan relay jumper wire. Connect a 20 A fused jumper between the cooling fan high speed relay switch B+ circuit terminal 2 and the relay controlled output circuit terminal 8. Ignition ON, verify the cooling fan is activated.
10. If the fan does not activate, test the relay controlled output circuit for a short to ground or an open/high resistance.
11. Ignition ON, verify that the left cooling fan is activated.
12. If the left cooling fan does not activate test the relay controlled output circuit for an open/high resistance.
13. If all circuits test normal, test or replace the relay.

1. Ignition OFF, disconnect the cooling fan relay.
2. Test for 70-110 ohms between terminals 4 and 6.
3. If the resistance is not within the specified range, replace the relay.
4. Test for infinite resistance between the following terminals: 2 and 6 2 and 8 2 and 4 4 and 8
5. If not the specified value, replace the relay.
6. Install a 20 A fused jumper wire between relay terminal 4 and B+. Install a jumper wire between relay terminal 6 and ground. Test for less than 2 ohms between terminals 2 and 8.
7. If greater than the specified range, replace the relay.
8. NOTE: This step is only for the KR20E Cooling Fan Speed Control Relay.
9. Remove the jumper wires. Test for less than 2 ohms between terminals 2 and 5.
10. If greater than the specified range, replace the relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect all five cooling fan relays.
2. Test for less than 5 ohms between the KR20E Cooling Fan Speed Control Relay terminal 8 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. NOTE: The following test must performed on all cooling fan relays. Ignition ON, verify that a test lamp illuminates between each relay switch B+ circuit terminal and ground.
5. If the test lamp does not illuminate, test the relay switch B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the relay switch B+ circuit fuse is open, test the relay controlled output circuit for a short to ground. If the circuit tests normal, test or replace the appropriate cooling fan motor.
6. Ignition OFF, connect a jumper wire between the KR20E Cooling Fan Speed Control Relay terminal 2 and the relay ground circuit terminal 8.
7. NOTE: The following test must be performed on both cooling fan low speed relays. Connect a 20 A fused jumper between the cooling fan low speed relay switch B+ circuit terminal 2 and the relay controlled output circuit terminal 8. Ignition ON, verify the cooling fan is activated.
8. If the fan does not activate, test the following conditions and repair as necessary. Relay controlled output circuit for a short to ground or an open/high resistance Open cooling fan resistor Open circuit between the G10L Cooling Fan Motor - Left terminal 3 and the KR20E Cooling Fan Speed Control Relay terminal 2 Fan ground circuit for an open/high resistance Cooling fan motor
9. NOTE: The following test must be performed on both cooling fan high speed relays. Ignition OFF, remove the low speed fan relay jumper wire. Connect a 20 A fused jumper between the cooling fan high speed relay switch B+ circuit terminal 2 and the relay controlled output circuit terminal 8. Ignition ON, verify the cooling fan is activated.
10. If the fan does not activate, test the relay controlled output circuit for a short to ground or an open/high resistance.
11. Ignition ON, verify that the left cooling fan is activated.
12. If the left cooling fan does not activate test the relay controlled output circuit for an open/high resistance.
13. If all circuits test normal, test or replace the relay.

1. Ignition OFF, disconnect the cooling fan relay.
2. Test for 70-110 ohms between terminals 4 and 6.
3. If the resistance is not within the specified range, replace the relay.
4. Test for infinite resistance between the following terminals: 2 and 6 2 and 8 2 and 4 4 and 8
5. If not the specified value, replace the relay.
6. Install a 20 A fused jumper wire between relay terminal 4 and B+. Install a jumper wire between relay terminal 6 and ground. Test for less than 2 ohms between terminals 2 and 8.
7. If greater than the specified range, replace the relay.
8. NOTE: This step is only for the KR20E Cooling Fan Speed Control Relay. Remove the jumper wires. Test for less than 2 ohms between terminals 2 and 5.
9. If greater than the specified range, replace the relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-653639-S15685196292014090100000)
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

Note. You must perform the circuit/system verification before proceeding with circuit/system testing.

1. Ignition OFF, disconnect the cooling fan relay.
2. Test for 70-110 ohms between terminals 85 and 86.
3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified range, replace the relay.
4. Test for less than 2 ohms between terminals 30 and 87A.
5. If greater than the specified range, replace the relay.
6. Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
7. If greater than the specified range, replace the relay.

Thermostat Test Procedure Using Glycol

Inspect the operation of the thermostat by hanging the thermostat on a hook in a 33 percent glycol solution.

In order to inspect if the thermostat valve is opening properly, perform the following test

Scheme 1

1. Completely submerge the thermostat in a glycol solution. The solution should be 11°C (22°F) above the temperature indicated on the thermostat valve.
2. Thoroughly agitate the solution. Under these conditions, the thermostat valve should open.

In order to inspect if the thermostat valve is closing properly, perform the following test

1. Completely submerge the thermostat in a glycol solution. The solution should be 6°C (10°F) below the temperature indicated on the thermostat valve.
2. Thoroughly agitate the solution. Under these conditions, the thermostat valve should close completely.

Pressure Cap Testing

1. Remove the pressure cap.
2. Wash the pressure cap mating surface with water.
3. Use a cooling system pressure tester with a suitable adapter in order to test the pressure cap.
4. Test the pressure cap for the following conditions: Pressure release when the cooling system pressure tester exceeds the pressure rating of the pressure cap Maintain the rated pressure for at least 10 seconds. Note the rate of pressure loss.
5. Replace the pressure cap under the following conditions: The pressure cap does not release pressure which exceeds the rated pressure of the cap. The pressure cap does not hold the rated pressure.

1. Remove the pressure cap.
2. Test the operation of the pressure cap. Refer to «PRESSURE CAP TESTING»(ref-653648-S11951008552014090100000) .
3. Wash the pressure cap mating surface with water.
4. Use a cooling system pressure tester with a suitable adapter in order to apply pressure to the cooling system. Do not exceed the pressure cap rating.
5. The cooling system should hold the rated pressure for at least 2 minutes. Observe the gauge for any pressure loss.
6. Repair any leaks, as necessary.