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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1350 (Engine Control System (Troubleshooting & Diagnosis) -- 1.8L (LNK)) >> Troubleshooting >> Auxiliary Intake Air System Diagnosis >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This step verifies that the vent port of the solenoid is open.
  2. 3:  This step verifies that the vent port of the solenoid is now closed.
  3. 7:  This step tests the control circuit of the solenoid.
Auxiliary Intake Air System Diagnosis

Step Action Value(s) Yes No
Schematic Reference:  Engine Controls Schematics 
1
  1. Turn OFF the ignition.
  2. Disconnect the electrical connector from the auxiliary intake air control solenoid.
  3. Measure the resistance of the solenoid using a DMM.
Is the resistance within the specified range?		 37-44 Ω at 20° C (68° F) Go to Step 2  Go to Step 10 
2 
  1. Disconnect the two vacuum hoses from the intake air control solenoid.
  2. Connect a J 23738-A  hand vacuum pump to the inboard port of the intake air control solenoid.
  3. Plug the outboard port of the intake air control solenoid.
  4. Observe the vacuum pump gage while attempting to apply the specified value of vacuum.
Did the vacuum indicated by the vacuum pump remain at zero?		 51 kPa (15 in Hg) Go to Step 3  Go to Step 10 
3 
  1. Install the scan tool.
  2. Connect the solenoid electrical connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Command the intake air control solenoid ON with the scan tool. Refer to Scan Tool Output Controls .
  5. Observe the vacuum pump gage while attempting to apply the specified value of vacuum.
Did the vacuum indicated by the vacuum pump reach the specified value?		 51 kPa (15 in Hg) Go to Step 4  Go to Step 5 
4 Command the intake air control solenoid OFF with the scan tool.
Did the vacuum indicated by the vacuum pump drop to zero?		 - System OK Go to Step 9 
5
  1. Disconnect the electrical connector from the auxiliary intake air control solenoid.
  2. Turn ON the ignition, leaving the engine OFF.
  3. Probe the ignition positive voltage circuit at the solenoid electrical connector with a test lamp connected to ground.
Does the test lamp illuminate?		 - Go to Step 6  Go to Step 8 
6
  1. Connect the test lamp across the terminals of the solenoid electrical connector.
  2. Command the solenoid ON using the scan tool.
Does the test lamp illuminate?		 - Go to Step 10  Go to Step 7 
7 
  1. Test for an open or a short to voltage in the solenoid control circuit.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 3  Go to Step 11 
8 Repair the open in the ignition positive voltage circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 3  -
9
  1. Test for a short to ground in the solenoid control circuit.
  2. Repair as necessary. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct a condition?		 - Go to Step 3  Go to Step 11 
10 Replace the auxiliary intake air control solenoid. Refer to Auxiliary Intake Air Control Solenoid Replacement .
Did you complete the replacement?		 - Go to Step 2  -
11 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - Go to Step 3  -
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