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 & Terminal 23 @ 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. Connect the electrical connector : X1 @ T12 Automatic Transmission Assembly
2. Ignition/Vehicle - Off
3. Disconnect the electrical connector : X1 @ T12 Automatic Transmission Assembly
4. Disconnect the appropriate electrical connector : K20 Engine Control Module
5. 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
6. Test for less than 2 ohms between the test points : 5 V Reference circuit terminal 11 @ Component harness & Terminal 39 @ 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. Connect the electrical connector : X1 @ T12 Automatic Transmission Assembly
2. Ignition/Vehicle - Off
3. Disconnect the electrical connector : X1 @ T12 Automatic Transmission Assembly
4. Disconnect the appropriate electrical connector :
   • { P0707, P0708 } K71 Transmission Control Module
   • { P2802, P2803 } K20 Engine Control Module
5. Disconnect the electrical connector : X1 @ T12 Automatic Transmission Assembly
6. Ignition - On / Vehicle - In Service Mode
7. 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
8. Connect the electrical connector : X1 @ T12 Automatic Transmission Assembly
9. Ignition/Vehicle - Off
10. Disconnect the electrical connector : X1 @ T12 Automatic Transmission Assembly
11. 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
12. 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%