Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Ignition/Vehicle & All vehicle systems - Off
NOTE: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
Disconnect the electrical connector: X175 @ T12 Automatic Transmission Assembly
Ignition - On / Vehicle - In Service Mode
Test for 8.3 to 9.6 V between the test points: 9 V Reference circuit terminal 7 & Ground
- If less than 8.3 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: K71 Transmission Control Module
3. Test for infinite resistance between the test points: 9 V Reference circuit terminal 7 @ Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance
4. Test for less than 2 Ω between the test points: 9 V Reference circuit terminal 7 @ Component harness & Terminal 7 @ Control module harness
  - If 2 Ω or greater - Repair the open/high resistance in the circuit.
  - If less than 2 Ω - Replace the component: K71 Transmission Control Module
- If greater than 9.6 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: K71 Transmission Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: 9 V Reference circuit terminal 7 @ Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - If less than 1 V - Replace the component: K71 Transmission Control Module
- If between 8.3 and 9.6 V
Ignition/Vehicle - Off
Install the special tool: EL-38522 Variable Signal Generator
- Set the voltage to 5 V
- Set the frequency to 300 Hz
- Set the duty cycle to 50%
- Black lead @ Ground
- Red lead @ Signal circuit terminal 6
Ignition - On / Vehicle - In Service Mode
Verify the scan tool parameter: Transmission OSS=640 to 700 RPM
- If not between 640 and 700 RPM
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: K71 Transmission Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: Signal circuit terminal 6 @ Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - If less than 1 V
5. Ignition/Vehicle - Off
6. Test for infinite resistance between the test points: Signal circuit terminal 6 @ Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance
7. Test for less than 2 Ω between the test points: Signal circuit terminal 6 @ Component harness & Terminal 14 @ Control module harness
  - If 2 Ω or greater - Repair the open/high resistance in the circuit.
  - If less than 2 Ω - Replace the component: K71 Transmission Control Module
- If between 640 and 700 RPM
Ignition/Vehicle - Off
Connect the electrical connector: X175 T12 Automatic Transmission Assembly
Remove the component: Transmission Cover
Disconnect the electrical connector: B14A Transmission Output Shaft Speed Sensor
Ignition - On / Vehicle - In Service Mode
Test for 8.3 to 9.6 V between the test points: 9 V Reference circuit terminal 1 & Ground
- If not between 8.3 and 9.6 V
  Replace the component: Automatic Transmission Wiring Harness
- If between 8.3 and 9.6 V
Ignition Off
Install the special tool: EL-38522 Variable Signal Generator
- Set the voltage to 5 V
- Set the frequency to 300 Hz
- Set the duty cycle to 50%
- Black lead @ Ground
- Red lead @ Signal circuit terminal 2
Ignition - On / Vehicle - In Service Mode
Verify the scan tool parameter: Transmission OSS=640 to 700 RPM
- If not between 640 and 700 RPM
  Replace the component: Automatic Transmission Wiring Harness
- If between 640 and 700 RPM
Test or replace the component: B14A Transmission Output Shaft Speed Sensor