LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 996 (Engine Controls Diagnosis - 6.6L (Lb7) (DTCS P0612 To P2141)) >> Diagnosis >> DTC P0700 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

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 TCM. Refer to Transmission Control Module (TCM) Replacement in Automatic Transmission-Allison.
  2. Connect a DMM from the 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 9  Go to Step 8 
7 Replace the TCM. Refer to Transmission Control Module (TCM) Replacement in Automatic Transmission-Allison.
Did you complete the replacement?		 - Go to Step 9  -
8 Replace the ECM. Refer to Engine Control Module (ECM) Replacement .
Did you complete the replacement?		 - Go to Step 9  -
9
  1. Use a scan tool to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC run and pass?		 - Go to Step 10  Go to Step 2 
10 With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
scientia non olet · About LEMON Manuals