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Home >> Chevrolet >> 2012 >> Camaro ZL1, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Transmission Fluid Temperature Gauge Malfunction >> Circuit/System Testing

Circuit/System Testing

Manual Transmission

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B173 Manual Transmission Fluid Temperature Sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 1 V between the low reference circuit terminal A and ground.
    • If 1 V or greater 

      repair the short to voltage on the circuit.

    • If less than 1 V 
  3. Test for less than 10 Ω between the low reference circuit terminal A and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 10 Ω 
  4. Ignition ON.
  5. Verify the scan tool Transmission Fluid Temperature parameter is greater than 155 degrees C.
    • If 155 degrees C or less 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • If greater than 155 degrees C 
  6. Install a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A.
  7. Verify the scan tool Transmission Fluid Temperature parameter is less than 5 degrees C.
    • If 5 degrees C or greater 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Ignition OFF
    4. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 5 degrees C 
  8. Test or replace the B173 Manual Transmission Fluid Temperature Sensor.
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