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1-4 Shift Light (Man. Trans. Corvette)

  1. This testing procedure assumes that a problem exists with the 1-4 shift light. Use this procedure only if the light will not illuminate or illuminates all of the time.
  2. Turn ignition on, with engine off. Note shift light. If shift light comes on, go to next step. If shift light does not come on, go to step 4).
  3. Turn ignition off. Disconnect ECM connector "A". Turn ignition on. Note shift light. If shift light comes on, repair short to ground in circuit No. 776 (White wire). See Figure. If shift light is off, replace ECM.
  4. Ground ALDL test terminals "A" and "B". See Figure. Note shift light. If shift light comes on, shift light circuit is okay, and no further testing is required. If shift light does not come on, go to next step.
  5. Turn ignition off. Disconnect ECM connector "A". Turn ignition on. Jumper circuit No. 776 (White wire) to ground. See Figure. Note shift light. If shift light does not come on, check for open in circuits No. 439 (Pink/Black wire) and No. 776 (White wire) or for faulty shift light bulb. If shift light comes on, check for faulty ECM connection or faulty ECM.
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