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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1472 (Engine Control System - Diagnosis - 4.2L (DTC P0140 To DTC P0506)) >> Diagnosis >> DTC P0410 >> Test Description

Test Description

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

  1. 9:  This step determines if excessive resistance on the supply voltage circuit between the AIR fuse and the AIR pump relay is the cause for an inoperative AIR pump. Two ohms of resistance on this circuit can prevent the AIR pump from running.
  2. 13:  This step determines if excessive resistance on the AIR pump relay circuit and PCM driver is the cause for an inoperative AIR pump relay. The test lamp in series is intended to generate a electrical load on this circuit. 90 ohms of resistance on this circuit can prevent the AIR pump relay from operating.
  3. 17:  This step determines if excessive resistance on the supply circuit is the cause for an inoperative AIR pump. Two ohms of resistance on this circuit can prevent the AIR pump from running.
  4. 18:  This step determines if excessive resistance on the ground circuit is the cause for an inoperative AIR pump. Two ohms of resistance on this circuit can prevent the AIR pump from running.
  5. 19:  This step determines if the AIR system is operating normally.
DTC P0410

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module (PCM) 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
  1. Turn ON the ignition, with the engine OFF.
  2. Listen for secondary air injection (AIR) pump operation.
Does the AIR pump run continuously?		 - Go to Step 3  Go to Step 4 
3 Remove the AIR pump relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems.
Does the AIR pump continue to operate?		 - Go to Step 52  Go to Step 5 
4
IMPORTANT: The AIR pump has an internal circuit breaker to protect the pump from overheating. Intermittent AIR pump operation during testing may be normal.
  1. Command the AIR pump relay ON and OFF with a scan tool.
  2. Listen for AIR pump operation.
Does the AIR pump turn ON and OFF when commanded with a scan tool?		 - Go to Step 19  Go to Step 6 
5
  1. Turn OFF the ignition.
  2. Probe the control circuit of the AIR pump relay with a test lamp that is connected to battery voltage. Refer to Probing Electrical Connectors in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 38  Go to Step 54 
6
  1. Remove the underhood fuse block cover.
  2. Inspect the AIR fuse.
Is the fuse open?		 - Go to Step 34  Go to Step 7 
7 Probe both test points of the AIR SOL fuse at the underhood fuse block.
Does the test lamp illuminate at both test points?		 - Go to Step 8  Go to Step 31 
8
  1. Turn OFF the ignition.
  2. Remove the AIR pump relay located near the AIR pump. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems.
  3. Probe the battery positive voltage circuit, switched side, of the AIR pump relay with a test lamp that is connected to a good ground. Refer to Probing Electrical Connectors in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 9  Go to Step 46 
9 
  1. Connect a J 36169-HD  Heavy Duty Fused Jumper Wire between the battery positive voltage circuit and the AIR pump supply voltage circuit at the AIR relay connector. Refer to Using Fused Jumper Wires in Wiring Systems.
  2. Measure the voltage drop from the battery positive circuit, switched side, of the AIR pump relay at the relay connector to battery voltage. Refer to Circuit Testing and Measuring Voltage Drop in Wiring Systems.
Is the voltage drop less than the specified value?		 0.6 V Go to Step 10  Go to Step 46 
10
  1. Remove the J 36169-HD  .
  2. Turn ON the ignition, with the engine OFF.
  3. Probe the ignition 1 voltage circuit, coil side, of the AIR pump relay with a test lamp that is connected to a good ground. Refer to Probing Electrical Connectors in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 11  Go to Step 48 
11 Measure the resistance of the ignition 1 voltage circuit from the AIR relay connector to the AIR SOL fuse.
Is the resistance less than the specified value?		 10 ohm Go to Step 12  Go to Step 48 
12
  1. Probe the control circuit of the AIR pump relay with a test lamp that is connected to battery voltage. Refer to Probing Electrical Connectors in Wiring Systems.
  2. Command the AIR pump relay ON and OFF with a scan tool.
Does the test lamp turn ON and OFF when commanded with a scan tool?		 - Go to Step 13  Go to Step 30 
13  Measure the resistance of the AIR pump relay control circuit from the AIR pump relay connector to the PCM connector with a DMM. Refer to Circuit Testing in Wiring Systems.
Is the resistance less than the specified value?		 10 ohm Go to Step 14  Go to Step 47 
14
  1. Connect a J 36169-HD  between the battery positive voltage circuit, switched side, and the AIR pump supply voltage circuit at the AIR pump relay connector. Refer to Using Fused Jumper Wires in Wiring Systems.
  2. Listen for AIR pump operation.
Does the AIR pump turn ON?		 - Go to Step 42  Go to Step 15 
15
  1. Ensure the J 36169-HD  is installed.
  2. Disconnect the AIR pump connector.
  3. Probe the AIR pump supply voltage circuit with a test lamp connected to a good ground. Refer to Probing Electrical Connectors in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 16  Go to Step 49 
16 Connect a test lamp between the AIR pump supply voltage circuit and the AIR pump ground circuit at the AIR pump harness connector.
Does the test lamp illuminate?		 - Go to Step 17  Go to Step 50 
17 
  1. Remove the J 36169-HD  from the relay connector.
  2. Connect a J 35616  GM Approved Terminal Test Kit to each of the terminals at the AIR pump harness connector and the corresponding terminal at the AIR pump. Refer to Using Connector Test Adapters in Wiring Systems.
  3. Connect the fused jumper wire J 36169-HD  at the AIR pump relay connector.
  4. Measure the voltage drop from the AIR pump supply circuit of the AIR pump connector to the AIR pump supply circuit at the AIR pump relay, with a DMM. Refer to Measuring Voltage Drop in Wiring Systems.
Is the voltage drop less than the specified value?		 0.6 V Go to Step 18  Go to Step 49 
18  Measure the voltage drop from the AIR pump ground circuit of the AIR pump, to a good ground with a DMM. Refer to Measuring Voltage Drop in Wiring Systems.
Is the voltage drop less than the specified value?		 0.6 V Go to Step 43  Go to Step 50 
19 
  1. Start and idle the engine until Closed Loop operation is achieved.
  2. Monitor the HO2S 1 voltage parameter with a scan tool.
  3. Command the AIR pump system ON with a scan tool.
Does the HO2S 1 voltage parameter decrease below the specified value?		 75 mV Go to Diagnostic Aids Go to Step 20 
20
  1. Turn OFF the ignition.
  2. Disconnect the AIR pump outlet hose from the AIR shut-off valve.
  3. Start and idle the engine.
  4. Command the AIR pump relay ON with a scan tool.
Is a pressurized airflow present at the AIR pump outlet hose?		 - Go to Step 21  Go to Step 40 
21
  1. Turn OFF the ignition.
  2. Disconnect the AIR solenoid connector at the AIR shut-off valve.
  3. Probe the AIR solenoid ground circuit with a test lamp that is connected to battery voltage. Refer to Probing Electrical Connectors in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 22  Go to Step 47 
22
  1. Turn the ignition to the ON position.
  2. Probe the AIR solenoid supply voltage circuit at the solenoid with a test lamp that is connected to a good ground. Refer to Probing Electrical Connectors in Wiring Systems.
  3. Command the AIR pump relay ON with a scan tool.
Does the test lamp illuminate?		 - Go to Step 23  Go to Step 25 
23 Measure the resistance of the following circuits:
  • The AIR solenoid supply voltage circuit
  • The AIR solenoid ground circuit

Is the resistance on each circuit less than the specified amount?		 10 ohm Go to Step 24  Go to Step 47 
24
  1. Ensure the AIR outlet hose is removed from the AIR shut-off valve.
  2. Connect a J 36169-A  Fused Jumper Wire from battery positive voltage to either terminal of the AIR solenoid.
  3. Start and idle the engine.
  4. Momentarily touch the other terminal of the AIR solenoid to a good ground with a jumper wire, 5 times for a duration of 2 seconds each.
Is an audible exhaust sound heard at the inlet of the AIR shut-off valve, each time the circuit is connected to a ground?		 - Go to Intermittent Conditions Go to Step 57 
25
  1. Turn ON the ignition, with the engine OFF.
  2. Connect the AIR solenoid.
  3. Remove the AIR solenoid relay.
  4. Probe both battery positive voltage circuits at the switched side and the coil side of the AIR solenoid relay connector with a test lamp that is connected to a good ground. Refer to Probing Electrical Connectors in Wiring Systems.
Does the test lamp illuminate?		 - Go to Step 26  Go to Step 53 
26
  1. Probe the control circuit of the AIR solenoid relay at the underhood fuse block with a test lamp connected to battery voltage. Refer to Probing Electrical Connectors in Wiring Systems.
  2. Command the AIR system ON and OFF with a scan tool.
Does the test lamp turn ON and OFF?		 - Go to Step 28  Go to Step 27 
27 Does the test lamp remain illuminated? - Go to Step 38  Go to Step 30 
28 Measure the resistance of the AIR solenoid relay control circuit from the AIR solenoid relay connector to the PCM connector with a DMM. Refer to Circuit Testing in Wiring Systems.
Is the resistance less than the specified value?		 10 ohm Go to Step 29  Go to Step 47 
29
IMPORTANT: The fuse rating shall not exceed the load rating of the jumper wire.
  1. Connect a J 36169-A  between the switched side voltage circuit and the AIR solenoid supply voltage circuit at the AIR solenoid relay connector in the underhood fuse block.
  2. Disconnect the AIR solenoid connector.
  3. Probe the AIR solenoid supply voltage circuit at the solenoid connector.
Does the test lamp illuminate?		 - Go to Step 45  Go to Step 51 
30 Test the AIR relay control circuit for an open, short to voltage, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 59  Go to Step 44 
31 Does the test lamp illuminate at one side of the AIR SOL fuse? - Go to Step 32  Go to Step 53 
32
  1. Test the AIR solenoid supply voltage circuit for a short to ground. Refer to Wiring Repairs and Circuit Testing in Wiring Systems.
  2. Replace the AIR solenoid fuse as necessary.
Did you find and correct the condition?		 - Go to Step 60  Go to Step 33 
33 Measure the resistance of the AIR solenoid.
Is the resistance within the specified range?		 4-8 ohm Go to Step 39  Go to Step 57 
34
  1. Test the battery positive voltage circuit between the AIR fuse and the relay for a short to ground. Refer to Wiring Repairs andCircuit Testing in Wiring Systems.
  2. Replace the AIR fuse as necessary.
Did you find and correct the condition?		 - Go to Step 60  Go to Step 35 
35 Test the AIR pump supply voltage circuit for a short to voltage. Refer to Wiring Repairs and Circuit Testing in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 59  Go to Step 36 
36 Test the AIR pump supply voltage circuit for a short to ground. Refer to Wiring Repairs and Circuit Testing in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 60  Go to Step 37 
37
  1. Install the AIR pump relay.
  2. Replace the AIR fuse as necessary.
  3. Connect the AIR pump, as necessary.
  4. Turn ON the ignition, with the engine OFF.
  5. Command the AIR pump system ON with a scan tool.
Does the AIR pump turn ON with a scan tool?		 - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 56 
38 Test the AIR relay control circuit for a short to ground. Refer to Wiring Repairs and Circuit Testing in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 59  Go to Step 44 
39
  1. Test all of the ignition 1 voltage circuits supplied by the AIR SOL fuse for a short to ground. Refer to Wiring Repairs and Circuit Testing in Wiring Systems.
  2. Replace the AIR SOL fuse as necessary.
Did you find and correct the condition?		 - Go to Step 60  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
40 Inspect the AIR pump outlet hose for the following conditions:
  • Restrictions
  • Leaks

Did you find and correct the condition?		 - Go to Step 60  Go to Step 41 
41 Inspect for a restriction at the following locations:
  • The AIR pump inlet hose
  • The engine air cleaner housing

Did you find and correct the condition?		 - Go to Step 60  Go to Step 56 
42 Test for an intermittent and for a poor connection at the AIR pump relay. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 59  Go to Step 54 
43 Test for an intermittent and for a poor connections at the AIR pump. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 59  Go to Step 56 
44 Test for shorted connections or for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 59  Go to Step 58 
45 Test for an intermittent and for a poor connection at the AIR solenoid relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 60  Go to Step 55 
46 Repair the open or high resistance in the battery positive circuit between the AIR pump fuse and the AIR pump relay. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 60  -
47 Repair the circuit with the open or high resistance. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 60  -
48 Repair the open or high resistance in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 60  -
49 Repair the open or high resistance in the AIR pump supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 60  -
50 Repair the open or high resistance in the AIR pump ground circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 60  -
51 Repair the open or high resistance in the AIR solenoid supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 - Go to Step 60  -
52
  1. Repair the short to voltage in the AIR pump supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.
  2. Replace the AIR solenoid fuse as necessary.
Did you complete the repair?		 - Go to Step 59  -
53 Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.
Did you complete the replacement?		 - Go to Step 60  -
54 Replace the AIR pump relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems.
Did you complete the replacement?		 - Go to Step 59  -
55 Replace the AIR solenoid relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) in Wiring Systems.
Did you complete the replacement?		 - Go to Step 60  -
56 Replace the AIR pump. Refer to Secondary Air Injection (AIR) Pump Replacement .
Did you complete the replacement?		 - Go to Step 59  -
57 Replace the AIR electronic shut-off valve assembly. Refer to Secondary Air Injection (AIR) Solenoid Valve Replacement .
Did you complete the replacement?		 - Go to Step 60  -
58 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - Go to Step 59  -
59
  1. Ensure all components and connectors are installed and secured.
  2. Replace fuses, as necessary.
  3. Turn the ignition ON, with the engine OFF.
  4. Command the AIR pump relay ON and OFF.
  5. Listen for AIR pump operation.
Does the AIR pump turn ON and OFF when commanded with a scan tool?		 - Go to Step 60  Go to Step 2 
60
  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 61 
61 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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