2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1530
Note: If you were sent here from Engine Cranks But Does Not Run proceed to Circuit/System Testing.
1. Engine running, command the Engine Controls (EC) Ignition Relay ON and OFF with a scan tool while observing the following EC Ignition
Relay control circuit status parameters:
* Engine Controls Ignition Relay Control Circuit Low Voltage Test Status
* Engine Controls Ignition Relay Control Circuit Open Test Status
* Engine Controls Ignition Relay Control Circuit High Voltage Test Status
Each parameter should display OK or Not Run.
2. Ignition ON, you should be able to communicate with the ECM using a scan tool.
3. Ignition ON, view the DTC information with a scan tool. DTC P0685, P0686, P0687, P0689, or P0690 should not set.
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the KR75 powertrain relay.
2. Ignition ON, verify a test lamp illuminates between both of the following relay battery voltage circuit terminals and ground.
* Terminal 86
* Terminal 87
瀚慖f the test lamp does not illuminate, test the relay battery voltage circuit for a short to ground or an open/high resistance.
Note: The ignition voltage circuit is between the powertrain relay and the ECM. The ignition voltage circuit is a feedback circuit.
3. Ignition OFF, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 30 and ground.
瀚慖f the test lamp illuminates, test the ignition voltage circuit for a short to voltage.
4. Connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 87 and the relay switch ignition voltage circuit terminal 30.
5. Ignition ON, observe the scan tool EC Ignition Relay Feedback Signal parameter. The ECM should communicate, and the parameter should
display 9-14 V.
瀚慖f not the specified range, or the ECM does not communicate, test the ignition voltage circuit between the powertrain relay and the ECM
for a short to ground or for an open/high resistance. If the circuit/connections test normal, replace the K20 ECM.
6. Ignition OFF, verify that a test lamp does not illuminate between the control circuit terminal 85 and B+.
瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
7. Connect a DMM set to the diode setting between the control circuit terminal 85 and ground.
8. Ignition ON, verify the DMM does not display OL.
瀚慖f the DMM displays OL, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the
K20 ECM.
9. If all circuits test normal, replace the KR75 powertrain relay.
Component Testing
Note: Depending on the application, the relay coil resistance will be within one of the following ranges.
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. Measure 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 continuity is detected, replace the KR75 powertrain relay.
