Tuesday, October 20, 2020

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1586

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1586



1. Test for one of the following resistance specifications between terminals 85 and 86 of the KR75 powertrain relay:



* 70-110 ohm



* 200-250 ohm



瀚慖f not within the specified range, replace the KR75 powertrain relay.



2. Test for infinite resistance between the following terminals of the KR75 powertrain relay:



* 30 and 86



* 30 and 87



* 30 and 85



* 85 and 87



瀚慖f not the specified value, replace the KR75 powertrain relay.



3. 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 ohm between terminals 30 and 87.



瀚慖f greater than the specified range, replace the KR75 powertrain relay.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay



Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power



Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))



* Control Module References (See: Testing and Inspection/Programming and Relearning) for K20 ECM replacement, setup, and



programming



P0686



DTC P0685, P0686, P0687, P0689, or P0690



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC P0685



- Engine Controls Ignition Relay Control Circuit



DTC P0686



- Engine Controls Ignition Relay Control Circuit Low Voltage



DTC P0687



- Engine Controls Ignition Relay Control Circuit High Voltage



DTC P0689



- Engine Controls Ignition Relay Feedback Circuit Low Voltage



DTC P0690



- Engine Controls Ignition Relay Feedback Circuit High Voltage



Diagnostic Fault Information

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