Circuit/System Testing

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

Ignition Off
Disconnect the electrical connector: Q8 Control Solenoid Valve Assembly

NOTE:

When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J-35616 GM-Approved Terminal Test Kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.
Testing for steps 2 - 5 is performed on the Q8 Control Solenoid Valve Assembly harness connector using the GY probe J-35616-2A.
Chassis ground to battery ground 25 - 35 Ω.

Test for less than 10 ohms between the test points: Low Reference circuit terminal 18 & Ground
- If 10 ohms or greater
1. Disconnect the X2 harness connector at the K71 Transmission Control Module.
2. Test for less than 10 Ω in the low reference circuit end to end.
  - If 10 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 10 Ω, replace the transmission control module.
- Go to next step: If less than 10 ohms
Ignition - On/Vehicle - In Service Mode
Test for 2.4 to 2.8 V between the test points: Signal circuit terminal 12 & Ground
- If less than 2.4 V
1. Ignition OFF, disconnect the X2 harness connector at the K71 Transmission Control Module.
2. Test for less than 10 Ω in the Sensor Signal circuit end to end.
  - If 10 Ω or greater, repair the open/high resistance in the circuit.
  - Go to next step: If less than 10 Ω.
3. Test for infinite resistance between the Sensor Signal circuit terminal 12 and chassis ground.
  - If less than infinite resistance, repair the short to ground in the circuit.
  - Go to next step: If infinite resistance.
4. Test for infinite resistance between the test points: Signal circuit terminal 12 and all other terminals of the Q8 Control Solenoid Valve Assembly harness connector.
  - If less than infinite resistance, repair the shorted together condition in the affected circuits.
  - If infinite resistance, test the K71 Transmission Control Module. Refer to Component Testing - K71 Transmission Control Module.
- If greater than 2.8 V
1. Ignition OFF, disconnect the X2 harness connector at the K71 Transmission Control Module.
2. Test for infinite resistance between the test points: Signal circuit terminal 12 and all other terminals of the Q8 Control Solenoid Valve Assembly harness connector.
  - If less than infinite resistance - Repair the short between the circuits.
  - If infinite resistance - Test or replace the component: K71 Transmission Control Module Refer to: Component Testing - K71 Transmission Control Module
- Go to next step: If between 2.4 and 2.8 V
Test for 2.4 to 2.8 V between the test points: Signal circuit terminal 12 & Low Reference circuit terminal 18
- If less than 2.4 V
1. Test for infinite resistance between the test points: Low Reference terminal 18 and all other terminals of the Q8 Control Solenoid Valve Assembly harness connector.
  - If less than infinite resistance - Repair the short between the circuits.
  - If infinite resistance - Test or replace the component: K71 Transmission Control Module Refer to: Component Testing - K71 Transmission Control Module
- If greater than 2.8 V
1. Test for infinite resistance between the test points: Low Reference terminal 18 and all other terminals of the Q8 Control Solenoid Valve Assembly harness connector.
  - If less than infinite resistance - Repair the short between the circuits.
  - If infinite resistance - Test or replace the component: K71 Transmission Control Module Refer to: Component Testing - K71 Transmission Control Module
- Go to next step: If between 2.4 and 2.8 V
All OK.