GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Body 🢒 Instrument Panel, Gages, and Console 🢒 Wait to Start Indicator Inoperative

Diagnostic Aids
    • The wait to start indicator illuminates with the ignition ON and the engine OFF. The wait to start indicator will not illuminate during post-start glow plug operation.
    • Ensure that the engine is not at full operating temperature before performing this diagnostic. The wait to start indicator will stay ON longer at lower engine temperatures.
    • For intermittent diagnosis, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Step

Action

Yes

No

Schematic Reference: Driver Information System Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Instrument Cluster Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2
  1. Turn the ignition ON, with the engine OFF.
  2. Observe the wait to start indicator in the message center.

Does the wait to start indicator not illuminate in the message center and then turn OFF?

Go to Step 3

Go to Diagnostic Aids

3
  1. Turn the ignition OFF.
  2. Disconnect the engine control module (ECM).
  3. Connect a 3 ampere fused jumper wire between the wait to start indicator control circuit and a good ground.
  4. Turn the ignition ON, with the engine OFF.

Does the wait to start indicator illuminate in the message center and then turn OFF?

Go to Step 6

Go to Step 4

4

Test the wait to start indicator control circuit for an open, for a short to voltage or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 5

5

Inspect for poor connections at the harness connector of the message center. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the message center. Refer to Telltale Circuit Board Replacement .

Did you complete the replacement?

Go to Step 9

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8

Important: Program the replacement ECM.

Replace the ECM. Refer to Engine Control Module Replacement/Restore Fuel Rate Data in Engine Controls - 7.8L.

Did you complete the replacement?

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2