Circuit/System Testing

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

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.

Ignition = Off
Disconnect the electrical connector: X175@T12 Automatic Transmission Assembly
Test for less than 5 ohms between the test points: Ground circuit terminal 30 & Ground
- If 5 ohms or greater
1. Disconnect the appropriate electrical connector: K71 Transmission Control Module
2. Test for less than 2 ohms between the test points: Ground circuit terminal 30 & 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: K71 Transmission Control Module
- Go to next step: If less than 5 ohms
Ignition = On
Test for 8. 3 to 9. 3 V between the test points: 9V Reference Circuit 1 Terminal 31 & Ground
- If 9. 3 V or greater
1. Ignition = Off
2. Disconnect the appropriate electrical connector: K71 Transmission Control Module
3. Ignition = On
4. Test for less than 1 V between the test points: 9V Reference Circuit 2 Terminal 29 & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - If less than 1 V, replace the K71 Transmission Control Module.
  - Go to next step: If less than 1 V
- If less than 8. 3 V
1. Ignition/Vehicle - Off
2. Disconnect the appropriate electrical connector: K71 Transmission Control Module
3. Test for infinite resistance between the test points: 9V Reference Circuit 1 Terminal 31 & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
4. Ignition/Vehicle - Off
5. Disconnect the appropriate electrical connector: K71 Transmission Control Module
6. Test for infinite resistance between the test points: 9V Reference Circuit 2 Terminal 29 & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
7. Test for less than 2 ohms between the test points: 9V Reference Circuit 1 Terminal 31 & The other end of the circuit
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K71 Transmission Control Module.
  - Go to next step: If less than 2 ohms
8. Test for less than 2 ohms between the test points: 9V Reference Circuit 2 Terminal 29 & 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: K71 Transmission Control Module
- Go to next step: If between 8. 3 and 9. 3 V
Verify the scan tool parameter: Internal Mode Switch = High
- If not the specified state
1. Ignition/Vehicle - Off
2. Disconnect the appropriate electrical connector: K71 Transmission Control Module
3. Test for infinite resistance between the test points: 9V Reference Circuit 1 Terminal 31 & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
4. Test for infinite resistance between the test points: 9V Reference Circuit 2 Terminal 29 & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance - Replace the component: K71 Transmission Control Module
- Go to next step: If the specified state
Connect a 3 A fused jumper wire between the test points: 9V Reference Circuit 1 Terminal 31 & Ground
Verify the scan tool parameter: 9V Reference Circuit 1 = Low
- If not the specified state
1. Ignition/Vehicle - Off
2. Remove - Jumper Wire
3. Disconnect the appropriate electrical connector: K71 Transmission Control Module
4. Test for less than 1 V between the test points: 9V Reference Circuit 1 Terminal 31 & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - Go to next step: If less than 1 V
5. Test for less than 2 ohms between the test points: 9V Reference Circuit 1 Terminal 31 & The other end of the circuit
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - Go to next step: If less than 2 ohms
Connect a 3 A fused jumper wire between the test points: 9V Reference Circuit 2 Terminal 29 & Ground
Verify the scan tool parameter: 9V Reference Circuit 2 = Low
- If not the specified state
1. Ignition/Vehicle - Off
2. Remove - Jumper Wire
3. Disconnect the appropriate electrical connector: K71 Transmission Control Module
4. Test for less than 1 V between the test points: 9V Reference Circuit 2 Terminal 29 & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - Go to next step: If less than 1 V
5. Test for less than 2 ohms between the test points: 9V Reference Circuit 2 Terminal 29 & 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: K71 Transmission Control Module
- Go to next step: If the specified state
Test for 11 to 13 V between the test points: Signal circuit terminal 35@X175 & Ground
- If not between 11 and 13 V
1. Ignition/Vehicle - Off
2. Disconnect the appropriate electrical connector: K71 Transmission Control Module
3. Test for infinite resistance between the test points: Signal circuit terminal 35@X175 & 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: Signal circuit terminal 35@X175 & Ground
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K71 Transmission Control Module
- Go to next step: If between 11 and 13 V
Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 35 & Ground circuit terminal 30@X175
Verify the scan tool parameter: Park/Neutral Position Switch = Park/Neutral
- If not the specified state
  Replace the component: K71 Transmission Control Module
- Go to next step: If the specified state
Refer to: Component Testing