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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1074 (Engine Controls Diagnosis - 6.6L (LLY) (DTC P0653 To DTC P2228)) >> Diagnosis >> DTC P0700 >> Test Description

Test Description

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The number below refers to the step number on the diagnostic table.

  1. 2:  If the TCM has diagnostic trouble codes (DTCs) set that are requesting MIL illumination, those DTCs must be diagnosed first.
DTC P0700

Step Action Values Yes No
Schematic Reference:  Engine Controls Schematics 
Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2  Connect a scan tool.
Are there any transmission DTCs set?		 - Go to Step 3  Go to Step 5 
3 Diagnose and repair any transmission DTCs.
Are there any transmission DTCs?		 - Go to Diagnostic Trouble Code (DTC) List/Type in Automatic Transmission - Allison Go to Step 4 
4
  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Does the DTC fail this ignition?		 - Go to Step 5  Go to Intermittent Conditions
5
  1. Disconnect the transmission control module (TCM). Refer to Transmission Control Module (TCM) Replacement in Automatic Transmission - Allison.
  2. Connect a DMM from the malfunction indicator lamp (MIL) request circuit in the TCM harness connector to a good ground.
  3. Turn ON the ignition, with the engine OFF.
Does the voltage measure near the specified value?		 B+ Go to Step 7  Go to Step 6 
6 Test the MIL request circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
7 Test for shorted terminals and for intermittent and poor connections at the TCM. Refer to Testing for Intermittent Conditions and Poor Connections , Repairing Connector Terminals , and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 9 
8 Test for shorted terminals and for intermittent and poor connections at the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections , Repairing Connector Terminals , and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
9 Replace the TCM. Refer to Transmission Control Module (TCM) Replacement in Automatic Transmission - Allison.
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 - Go to Step 11  -
11
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 12 
12 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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