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/Vehicle & All vehicle systems - Off
Disconnect the electrical connector: X1 @ 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 18 & 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 18 @ 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: 9 V Reference circuit terminal 18 @ 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: 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 18 @ 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
- Go to next step: If between 8.3 and 9.6 V
Ignition/Vehicle - Off
Install & Setup - EL-38522 Variable Signal Generator
- Voltage - 5 V
- Frequency - 300 Hz
- Duty Cycle - 50%
- Black lead @ Ground
- Red lead @ Signal circuit terminal 6
Ignition - On / Vehicle - In Service Mode
Verify the scan tool parameter: Transmission Input Speed = 290 to 310 RPM
- If not between 290 and 310 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.
  - Go to next step: 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.
  - Go to next step: If infinite resistance
7. Test for less than 2 ohms between the test points: Signal circuit terminal 6 @ 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: K71 Transmission Control Module
- Go to next step: If between 290 and 310 RPM
Remove the component: Control Valve Body Cover
Connect the electrical connector: X1 @ T12 Automatic Transmission Assembly
Disconnect the electrical connector: B14C Transmission Input Shaft Speed Sensor
Install & Setup - EL-38522 Variable Signal Generator
- Voltage - 5 V
- Frequency - 300 Hz
- Duty Cycle - 50%
- Black lead @ Ground
- Red lead @ Signal circuit terminal 1
Ignition - On / Vehicle - In Service Mode
Verify the scan tool parameter: Transmission Input Speed = 290 to 310 RPM
- If not between 290 and 310 RPM
  Replace the component: Automatic Transmission Wiring Harness
- Go to next step: If between 290 and 310 RPM
Test for 8.3 to 9.6 V between the test points: 9 V Reference circuit terminal 2 & Ground
- If not between 8.3 and 9.6 V
  Replace the component: Automatic Transmission Wiring Harness
- Go to next step: If between 8.3 and 9.6 V
Test or replace the component: B14C Transmission Input Shaft Speed Sensor