Circuit/System Testing

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

Vehicle OFF, remove the control valve body cover. Refer to Control Valve Body Cover Replacement .
NOTE: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
Disconnect the harness connector at the B15 Transmission Internal Mode Switch.
Vehicle in Service Mode.
Test for 8.3V to 9.4V between both 9V reference circuits terminal 1, terminal 8 and ground.
- If not within the specified range
  Test the voltage circuits for an open/high resistance end to end.
- If 2 Ω or greater, replace the A/Trans Wiring Extension Harness Assembly.
- If 2 Ω or less, replace the T6 Power Inverter Module.
- If within the specified range
Vehicle ON.
Install a 3 A fused jumper wire between each signal circuit listed below and the 9V reference circuit:
- Switch Signal A: terminal 2 and terminal 1
- Switch Signal B: terminal 6 and terminal 8
- Switch Signal C: terminal 3 and terminal 1
- Switch Signal P: terminal 7 and terminal 8
- Switch Signal S: terminal 5 and terminal 8
Verify each scan tool Internal Mode Switch A/B/C/P/S voltage parameter displays 4.88 - 5.12 V when jumped.
- If any parameter does not display 4.88 - 5.12 V when jumped
  Test the signal circuit for an open/short to voltage or short together.
- If an open/short to voltage or short together is found, replace the Automatic Transmission Wiring Harness - Shift Shaft Position Switch.
- If an open/short to voltage or short together is not found, replace the T6 Power Inverter Module.
- If each signal circuit parameter displays 4.88 - 5.12 V when jumped
Replace the B15 Transmission Internal Mode Switch.