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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Control System - 4.6L (LH2) - DTC P0420 To P0689) >> DTC P0689 >> Diagnostic Aids

Diagnostic Aids

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DTC P0689

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference: Engine Control Module Connector End Views and Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 If DTCs P0686 or DTC P0687 are set along with DTC P0689, then DTC P0686 or DTC P0687 must be diagnosed first.
Is DTC P0686 or DTC P0687 also set?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle Go to Step 3 
3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze/Frame Failure Records.
Did the DTC fail this ignition?		 - Go to Step 4  Go to Intermittent Conditions
4
  1. Turn ON the ignition, with the engine OFF.
  2. Probe both test points of the V8 ECM fuse in the underhood fuse block with a test lamp that is connected to a good ground. Refer to Troubleshooting with a Test Lamp .
Does the test lamp illuminate on both test points of the V8 ECM fuse?		 - Go to Step 8  Go to Step 5 
5 Does the test lamp illuminate on one test point of the V8 ECM fuse? - Go to Step 6  Go to Step 10 
6
  1. Turn OFF the ignition.
  2. Disconnect the negative battery cable at the battery. Refer to Battery Negative Cable Disconnection and Connection .
  3. Disconnect the underhood fuse block electrical connector that contains the ignition 1 voltage circuit from the V8 ECM fuse to the engine control module (ECM). Refer to Underhood Electrical Center or Junction Block Replacement .
  4. Disconnect the ECM electrical connector that contains the ignition 1 voltage circuit from the V8 ECM fuse. Refer to Engine Control Module Replacement .
  5. Probe the ignition 1 voltage circuit at the ECM electrical connector with a test lamp that is connected to battery positive voltage. Refer to Probing Electrical Connectors .
Does the test lamp illuminate?		 - Go to Step 20  Go to Step 7 
7 Test the underhood fuse block bus bar circuit from the V8 ECM fuse to the underhood fuse block electrical connector for a short to ground. Refer to Circuit Testing .
Did you find a condition?		 - Go to Step 22  Go to Step 19 
8
  1. Turn OFF the ignition.
  2. Disconnect the negative battery cable at the battery. Refer to Battery Negative Cable Disconnection and Connection .
  3. Disconnect the underhood fuse block electrical connector that contains the ignition 1 voltage circuit from the V8 ECM fuse to the ECM. Refer to Underhood Electrical Center or Junction Block Replacement .
  4. Disconnect the ECM electrical connector that contains the ignition 1 voltage circuit from the V8 ECM fuse. Refer to Engine Control Module Replacement .
  5. Measure the resistance of the ignition 1 voltage circuit from the underhood fuse block electrical connector to the ECM electrical connector with a DMM. Refer to Troubleshooting with a Digital Multimeter .
Does the resistance measure the more than the specified value?		 3 ohm Go to Step 21  Go to Step 9 
9 Test the underhood fuse block ignition 1 voltage bus bar circuit from the V8 ECM fuse to the underhood fuse block electrical connector for a high resistance or an open. Refer to Circuit Testing .
Did you find a condition?		 - Go to Step 22  Go to Step 19 
10
  1. Turn OFF the ignition.
  2. Remove the powertrain relay from the underhood fuse block with the J 43244  Relay Puller Pliers. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) .
    3. NOTE: Refer to Test Probe Notice .
  3. Probe the battery positive voltage terminal for the main relay armature at the underhood fuse block with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 - Go to Step 11  Go to Step 12 
11 Test the underhood fuse block ignition 1 voltage bus bar circuit between the main relay and the V8 ECM fuse for a high resistance or an open. Refer to Circuit Testing .
Did you find a condition?		 - Go to Step 22  Go to Step 13 
12 Probe the mounting stud for the battery positive cable at the underhood fuse block with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 - Go to Step 22  Go to Symptoms - Engine Electrical
13 Measure the resistance from terminal #85 of the powertrain relay to terminal #86 with a DMM. Refer to Troubleshooting with a Digital Multimeter .
Does the resistance measure within the specified range?		 70-110 ohm Go to Step 14  Go to Step 23 
14 Measure the resistance from terminal #30 of the powertrain relay to terminal #87 with a DMM.
Does the DMM display the specified value?		 infinity ohm Go to Step 15  Go to Step 23 
15 Measure the resistance from terminal #30 of the powertrain relay to terminal #85 with a DMM.
Does the DMM display the specified value?		 infinity ohm Go to Step 16  Go to Step 23 
16 Measure the resistance from terminal #85 of the powertrain relay to terminal #87 with a DMM.
Does the DMM display the specified value?		 infinity ohm Go to Step 17  Go to Step 23 
17
  1. Connect a 20-amp fused jumper wire from the battery positive cable at the battery to the main relay terminal #85. Refer to Using Fused Jumper Wires .
  2. Connect a jumper wire from the negative battery cable at the battery to the powertrain relay terminal #86.
  3. Measure the resistance from terminal #30 of the powertrain relay to terminal #87 with a DMM.
Does the resistance measure greater than the specified value?		 3 ohm Go to Step 23  Go to Step 18 
18 Test for an intermittent and for a poor connection at the powertrain relay location on the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections .
Did you find a condition?		 - Go to Step 22  Go to Intermittent Conditions
19 Test for shorted terminals and poor connection at the ECM electrical connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Delphi Connectors (Micro .64) or Delphi Connectors (Micro-Pack 100W) or Delphi Connectors (Pull To Seat) or Delphi Connectors (Push To Seat) or Delphi Connectors (Weather Pack) or Delphi Connectors (12-Way) .
Did you find and correct the condition?		 - Go to Step 25  Go to Step 24 
20 Repair the short to ground in the main voltage circuit between the underhood fuse block electrical connector and the ECM electrical connector. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 25  -
21 Repair the high resistance or an open in the ignition 1 voltage circuit between the underhood fuse block electrical connector and the ECM electrical connector. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 25  -
22 Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement .
Did you complete the replacement?		 - Go to Step 25  -
23 Replace the powertrain relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) .
Did you complete the replacement?		 - Go to Step 25  -
24 Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 25  -
25
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze/Frame Failure Records.
Did the DTC fail this ignition?		 - Go to Step 4  Go to Step 26 
26 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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