LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1170 (Engine Controls Diagnosis - 6.0L - Alternative Fuels (DTC P0005-DTC P2665)) >> Diagnosis >> DTC P1207: Fuel Injector Control Module Sensor Signal Circuit 1 >> Test Description

Test Description

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

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step determines if the fuel injector control module (FICM) is powered ON. A loss of power or ground to the FICM may set this DTC. A KL6 vehicle may start on gasoline after several seconds.
  2. 3:  This step determines if the condition is present.
  3. 5:  This step verifies that the PCM is supplying the correct output voltage. The open circuit voltage should be 5 volts.
DTC P1207

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check Alternative Fuels - Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Alternative Fuels (Engine Controls)
2 
  1. Clear the DTC information with a scan tool.
  2. Turn the ignition OFF for 30 seconds.
  3. Attempt to start and idle the engine on compressed natural gas (CNG). Crank the engine for up to 15 seconds if required.
Does the engine only operate on gasoline or is DTC P0611 set?		 - Go to DTC P0611  Go to Step 3 
3  Observe the FICM odd bank circuit status with a scan tool.
Does the scan tool display FAULT?		 - Go to Step 5  Go to Step 4 
4
  1. Observe the Freeze Frame and/or the Failure Records data for this DTC.
  2. Turn the ignition OFF 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 and/or the Failure Records data.
Does the DTC fail this ignition cycle?		 - Go to Step 5  Go to Intermittent Conditions
5 
  1. Turn OFF the ignition.
  2. Disconnect the fuel injector control module (FICM) harness connector. Refer to Fuel Injection Control Module Replacement .
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the pulse width modulated (PWM) output circuit with a DMM.
Does the DMM display the voltage at the specified value?		 5 V Go to Step 10  Go to Step 6 
6 Is the voltage more than the specified value? 5.3 V Go to Step 8  Go to Step 7 
7 Test for an open, or a short to ground on the PWM output circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems in the C/K Pickup Service Manual.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 9 
8 Test for a short to voltage on the PWM output circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems in the C/K Pickup Service Manual.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 11 
9 Inspect for proper terminal contact at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems in the C/K Pickup Service Manual.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 11 
10 Inspect for proper terminal contact at the harness connector of the FICM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems in the C/K Pickup Service Manual.
Did you find and correct the condition?		 - Go to Step 13  Go to Step 12 
11 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls in the C/K Pickup Service Manual.
Did you complete the replacement?		 - Go to Step 13  -
12 Replace the FICM. Refer to Fuel Injection Control Module Replacement .
Did you complete the replacement?		 - Go to Step 13  -
13
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
  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 14 
14 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
scientia non olet · About LEMON Manuals