Circuit/System Testing

• If 10 ohms or greater 

1. Disconnect the electrical connector: K20 Engine Control Module
2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 10 @ Component harness & The other end of the circuit @ Control module harness
   • If 2 ohms or greater - Repair the open/high resistance in the circuit.
   • If less than 2 ohms - Replace the component: K20 Engine Control Module

• Go to next step: If less than 10 ohms 

• If less than 4.8 V 

1. Ignition/Vehicle - Off
2. Disconnect the appropriate electrical connector: K20 Engine Control Module
3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 11 @ Component harness & Ground
   • If less than infinite resistance - Repair the short to ground on the circuit.
   • Go to next step: If infinite resistance
4. Test for less than 2 ohms between the test points: 5 V Reference circuit terminal 11 @ Component harness & The other end of the circuit @ Control module harness
   • If 2 ohms or greater - Repair the open/high resistance in the circuit.
   • If less than 2 ohms - Replace the component: K20 Engine Control Module

• If greater than 5.2 V 

1. Disconnect the appropriate electrical connector: K20 Engine Control Module
2. Ignition - On / Vehicle - In Service Mode
3. Test for less than 1 V between the test points: 5 V Reference circuit terminal 11 @ Component harness & Ground
   • If 1 V or greater - Repair the short to voltage on the circuit.
   • If less than 1 V - Replace the component: K20 Engine Control Module

• Go to next step: If between 4.8 and 5.2 V 

• Voltage - 5 V
• Frequency - 300 Hz
• Duty Cycle - 50%
• Red lead @
  • {P0707, P0708} Signal circuit terminal 9
  • {P2802, P2803} Signal circuit terminal 8
• Black lead @ Ground

Transmission Range Sensor 1, 2 = 48 to 52%

• If not between 48 and 52% 

1. Ignition/Vehicle - Off
2. Disconnect the appropriate electrical connector:
   • {P0707, P0708} K71 Transmission Control Module
   • {P2802, P2803} K20 Engine Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points:
   • {P0707, P0708} Signal circuit terminal 9 @ Component harness & Ground
   • {P2802, P2803} Signal circuit terminal 8 @ Component harness & Ground
   • If 1 V or greater - Repair the short to voltage on the circuit.
   • Go to next step: If less than 1 V
5. Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
6. Ignition/Vehicle - Off
7. Disconnect the electrical connector: X1 @ T12 Automatic Transmission Assembly
8. Test for infinite resistance between the test points:
   • {P0707, P0708} Signal circuit terminal 9 @ Component harness & Ground
   • {P2802, P2803} Signal circuit terminal 8 @ Component harness & Ground
   • If less than infinite resistance - Repair the short to ground on the circuit.
   • Go to next step: If infinite resistance
9. Test for less than 2 ohms between the test points:
   • {P0707, P0708} Signal circuit terminal 9 @ Component harness & The other end of the circuit
   • {P2802, P2803} Signal circuit terminal 8 @ Component harness & The other end of the circuit
   • If 2 ohms or greater - Repair the open/high resistance in the circuit.
   • If less than 2 ohms - Replace the component:
   • {P0707, P0708} K71 Transmission Control Module
   • {P2802, P2803} K20 Engine Control Module

• Go to next step: If between 48 and 52% 

• Voltage - 5 V
• Frequency - 300 Hz
• Duty Cycle - 50%
• Black lead @ Ground
• Red lead @
  • {P0707, P0708} Signal circuit terminal 2
  • {P2802, P2803} Signal circuit terminal 4

• If not between 48 and 52% 

  Replace the component: Automatic Transmission Wiring Harness

• Go to next step: If between 48 and 52%