DTC P0691-P0696 (LPL or LPV)
Diagnostic Instructions
DTC Descriptors
| DTC P0691: Cooling Fan Relay 1 Control Circuit
Low Voltage |
| DTC P0692: Cooling Fan Relay 1 Control Circuit
High Voltage |
| DTC P0693: Cooling Fan Relay 2 Control Circuit
Low Voltage |
| DTC P0694: Cooling Fan Relay 2 Control Circuit
High Voltage |
| DTC P0695: Cooling Fan Relay 3 Control Circuit
Low Voltage |
| DTC P0696: Cooling Fan Relay 3 Control Circuit
High Voltage |
Diagnostic Fault Information
Cooling Fan Low Speed Relay
Circuit
|
Short to Ground
|
High Resistance
|
Open
|
Short to Voltage
|
Signal Performance
|
Relay Coil Ignition
|
P0691
|
P0691
|
P0691
|
-
|
-
|
Relay Switch B+
|
1
|
1
|
1
|
-
|
-
|
Relay Coil Control
|
P0691
|
P0691
|
P0691
|
P0692
|
-
|
Relay Output Control
|
1
|
1
|
1
|
2
|
-
|
1. Fan Inoperative Without a DTC.
2. Fan Always ON Without a DTC.
|
|
| |
Cooling Fan Medium Speed Relay (w/AC), Cooling Fan High Speed
(w/o AC)
Circuit
|
Short to Ground
|
High Resistance
|
Open
|
Short to Voltage
|
Signal Performance
|
Relay Coil Ignition
|
P0693
|
P0693
|
P0693
|
-
|
-
|
Relay Switch B+
|
1
|
1
|
1
|
-
|
-
|
Relay Coil Control
|
P0693
|
P0693
|
P0693
|
P0694
|
-
|
Relay Output Control
|
1
|
1
|
1
|
2
|
-
|
1. Fan Inoperative Without a DTC.
2. Fan Always ON Without a DTC.
|
|
| |
Cooling Fan High Speed Relay (w/AC)
Circuit
|
Short to Ground
|
High Resistance
|
Open
|
Short to Voltage
|
Signal Performance
|
Relay Coil Ignition
|
P0695
|
P0695
|
P0695
|
-
|
-
|
Relay Switch B+
|
1
|
1
|
1
|
-
|
-
|
Relay Coil Control
|
P0695
|
P0695
|
P0695
|
P0696
|
-
|
Relay Output Control
|
1
|
1
|
1
|
2
|
-
|
1. Fan Inoperative Without a DTC.
2. Fan Always ON Without a DTC.
|
|
| |
Circuit/System Description
The engine control module (ECM) commands the fans ON in either
high speed, medium speed, or low speed, depending on cooling
requirements.
Low Speed
In low speed operation, the ECM applies ground to the coil side of
the cooling fan low speed relay with the cooling fan relay 1
control circuit.
This energizes the relay coil. The low speed cooling fan relay
supply power to the cooling fan motor through an internal fan
resistor.
Medium Speed
In medium speed operation, the ECM commands the medium speed fan
relay on. This energizes the relay coil. The medium speed cooling
fan relay supply power to the cooling fan motor through an internal
fan resistor. The cooling fan is connected to a dedicated ground,
and operates at medium speed.
High Speed
In high speed operation, the ECM applies a ground to the coil side
of all the high speed cooling fan relay. When energized, the high
speed relays apply voltage directly to the cooling fan through the
switch side of the relay.
Conditions for Running the DTC
| • |
The ignition voltage is
between 8-18 V. |
| • |
The engine is running greater
than or equal to 400 RPM. |
Conditions for Setting the DTC
P0691
The ECM detects a short to ground on the cooling fan relay 1
control circuit.
P0692
The ECM detects a short to voltage on the cooling fan relay 1
control circuit.
P0693
The ECM detects a short to ground on the cooling fan relay 2
control circuit.
P0694
The ECM detects a short to voltage on the cooling fan relay 2
control circuit.
P0695
The ECM detects a short to ground on the cooling fan relay 3
control circuit.
P0696
The ECM detects a short to voltage on the cooling fan relay 3
control circuit.
Action Taken When the DTC Sets
DTCs P0691, P0692, P0693, P0694, P0695 and P0696 are Type B
DTCs.
Conditions for Clearing the DTC
DTCs P0691, P0692, P0693, P0694, P0695 and P0696 are Type B
DTCs.
Reference Information
Schematic Reference
Engine Cooling Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Cooling System Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
Command the Cooling Fan Relay
1 ON and OFF with a scan tool. The clicking sound of the relay
should be heard when changing between the commanded states.
|
| ⇒ |
If the relay does not operate correctly, refer to
P0691 and P0692. |
| 2. |
Command the Cooling Fan Relay
2 ON and OFF with a scan tool. The clicking sound of the relay
should be heard when changing between the commanded states.
|
| ⇒ |
If the relay does not operate correctly, refer to
P0693 and P0694. |
| 3. |
Command the Cooling Fan Relay
3 ON and OFF with a scan tool. The clicking sound of the relay
should be heard when changing between the commanded states.
|
| ⇒ |
If the relay does not operate correctly, refer to
P0695 and P0696. |
Circuit/System Testing
P0691 and P0692
| 1. |
Ignition OFF, disconnect the
KR20C Cooling Fan Low Speed Relay. |
| 2. |
Ignition ON, verify that a
test lamp illuminates between the relay coil ignition circuit
terminal 86 and ground. |
| ⇒ |
If the test lamp does not illuminate, replace the
X50A Fuse Block - Underhood. |
| 3. |
Verify that a test lamp does
not illuminate between the relay coil control circuit terminal 85
and ground. |
| ⇒ |
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 X1 at the K20 Engine Control Module. Test for
infinite resistance between the relay coil control circuit terminal
85 and ground. |
| ⇒ |
If less than the specified value, test the relay
coil control circuit for a short to ground. |
| 5. |
Test for less than 5 Ω
between relay coil control circuit terminal 85 and K20 Engine
Control Module terminal 36 X1. |
| ⇒ |
If greater than the specified value, test the
relay coil control circuit for an open/high resistance. |
| 6. |
If all circuits test normal,
test or replace the KR20C Cooling Fan Low Speed Relay and verify
the DTC does not reset. |
| ⇒ |
If the DTC resets, replace the K20 Engine Control
Module. |
P0693 and P0694 with AC
| 1. |
Ignition OFF, disconnect the
KR20B Cooling Fan Medium Speed 2 Relay. |
| 2. |
Ignition ON, verify that a
test lamp illuminates between the relay coil ignition circuit
terminal 86 and ground. |
| ⇒ |
If the test lamp does not illuminate, replace the
X50A Fuse Block - Underhood. |
| 3. |
Verify that a test lamp does
not illuminate between the relay coil control circuit terminal 85
and ground. |
| ⇒ |
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 X1 at the K20 Engine Control Module. Test for
infinite resistance between the relay coil control circuit terminal
85 and ground. |
| ⇒ |
If less than the specified value, test the relay
coil control circuit for a short to ground. |
| 5. |
Test for less than 5 Ω
between relay coil control circuit terminal 85 and K20 Engine
Control Module terminal 54 X1. |
| ⇒ |
If greater than the specified value, test the
relay coil control circuit for an open/high resistance. |
| 6. |
If all circuits test normal,
test or replace the KR20B Cooling Fan Medium Speed 2 Relay and
verify the DTC does not reset. |
| ⇒ |
If the DTC resets, replace the K20 Engine Control
Module. |
P0693 and P0694 w/o AC
| 1. |
Ignition OFF, disconnect the
KR20D Cooling Fan High Speed Relay. |
| 2. |
Ignition ON, verify that a
test lamp illuminates between the relay coil ignition circuit
terminal 86 and ground. |
| ⇒ |
If the test lamp does not illuminate, replace the
X50A Fuse Block - Underhood. |
| 3. |
Verify that a test lamp does
not illuminate between the relay coil control circuit terminal 85
and ground. |
| ⇒ |
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 X1 at the K20 Engine Control Module. Test for
infinite resistance between the relay coil control circuit terminal
85 and ground. |
| ⇒ |
If less than the specified value, test the relay
coil control circuit for a short to ground. |
| 5. |
Test for less than 5 Ω
between relay coil control circuit terminal 85 and K20 Engine
Control Module terminal 48 X1. |
| ⇒ |
If greater than the specified value, test the
relay coil control circuit for an open/high resistance. |
| 6. |
If all circuits test normal,
test or replace the KR20D Cooling Fan High Speed Relay and verify
the DTC does not reset. |
| ⇒ |
If the DTC resets, replace the K20 Engine Control
Module. |
P0695 and P0696
| 1. |
Ignition OFF, disconnect the
KR20D Cooling Fan High Speed Relay. |
| 2. |
Ignition ON, verify that a
test lamp illuminates between the relay coil ignition circuit
terminal 86 and ground. |
| ⇒ |
If the test lamp does not illuminate, replace the
X50A Fuse Block - Underhood. |
| 3. |
Verify that a test lamp does
not illuminate between the relay coil control circuit terminal 85
and ground. |
| ⇒ |
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 X1 at the K20 Engine Control Module. Test for
infinite resistance between the relay coil control circuit terminal
85 and ground. |
| ⇒ |
If less than the specified value, test the relay
coil control circuit for a short to ground. |
| 5. |
Test for less than 5 Ω
between relay coil control circuit terminal 85 and K20 Engine
Control Module terminal 48 X1. |
| ⇒ |
If greater than the specified value, test the
relay coil control circuit for an open/high resistance. |
| 6. |
If all circuits test normal,
test or replace the KR20D Cooling Fan High Speed Relay and verify
the DTC does not reset. |
| ⇒ |
If the DTC resets, replace the K20 Engine Control
Module. |
Component Testing
Dynamic Test
| 1. |
Ignition OFF, disconnect the
applicable relay. |
| 2. |
Test for 70-110 Ω
between terminals 85 and 86 of the relay. |
| ⇒ |
If the resistance is not within the specified
range, replace the relay. |
| 3. |
Test for infinite resistance
between the following terminals: |
| ⇒ |
If not the specified value, replace the relay. |
| 4. |
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 Ω
between terminals 30 and 87. |
| ⇒ |
If greater than the specified value, replace the
relay. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Repair Verification
| 1. |
Ignition ON, verify with a
scan tool that the ECM is not commanding fan activation.
|
| 2. |
Ignition ON, observe that the
fan is not activated. |
Ignition ON, verify with a scan tool that the ECM is not
commanding fan activation. Ignition ON, observe that the fan is not
activated.
|
