Circuit Description
The PCM controls the relay by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the controlled component. Each driver has a fault line which the PCM monitors. When the PCM commands a component ON, the voltage of the control circuit should be low (near 0 volts). When the PCM commands the control circuit to a component OFF, the voltage potential of the circuit should be high (near the battery voltage). If the fault detection circuit senses a voltage other than what the PCM is expects, the fault line status changes causing the DTC to set.
The relay controls the high current flow to the AIR injection pump. This allows the PCM driver to only have to control the relatively low current used by the relay.
Conditions for Running the DTC
| • | The engine speed is greater than 400 RPM. |
| • | The ignition voltage is between 6.0 volts and 18 volts |
Conditions for Setting the DTC
| • | The PCM detects that the commanded state of the driver and the actual state of the control circuit do not match. |
| • | All the above conditions are present for a minimum of 5.0 seconds. |
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | A last test failed, or the current DTC, clears when the diagnostic runs and does not fail. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other emission related diagnostic. |
| • | Use a scan tool in order to clear the MIL/DTC. |
Diagnostic Aids
Important:
• Remove any debris from the PCM connector surfaces before servicing
the PCM. Inspect the PCM connector gaskets when diagnosing/replacing
the PCM. Ensure that the gaskets are installed correctly. The gaskets
prevent contaminate intrusion into the PCM. • For any test that requires probing the PCM or a component
harness connector, use the Connector Test Adapter Kit J 35616
. Using this kit prevents damage
to the harness/component terminals. Refer to
Using Connector Test Adapters
in Wiring Systems.
| • | The scan tool offers three modes of AIR output controls. AIR pump relay, AIR solenoid, and AIR system. |
| • | For underhood fuseblock terminal identification, refer to Electrical Center Identification Views in Wiring Systems. |
| • | Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed. |
| • | For an intermittent, refer to Symptoms . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Listen for an audible click when the relay operates. Command both the ON and the OFF states. Repeat the commands as necessary.
-
This test can detect a partially shorted coil which would cause an excessive current flow. Leaving the circuit energized for 2 minutes allows the coil to warm up. When warm the coil may open (current drops to 0), or short (current goes above 0.75 Amp).
-
Identify and test the correct relay terminals in order to avoid improper diagnosis.
-
Listen for an audible click as the relay turns ON and OFF. Repeat the procedure as necessary.
-
If DTCs P0412 and P0418 are set at the same time, inspect the AIR pump fuse for an open. If the fuse is open repair the grounded circuit.
-
If no trouble is found in the control circuit or the connection at the PCM, the PCM may be faulty. However, this is an extremely unlikely failure.
-
The repair is not complete if the scan tool indicates that the diagnostic ran and failed.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
Does the relay turn ON and OFF when commanded? | -- | |||
Important: If the DMM goes to 0, replace the relay. Does the current draw measure less than the specified value? | 0.75 A | Go to Diagnostic Aids | ||
4 |
Does the DMM display infinite resistance? | -- | ||
|
Important: For underhood electrical center relay terminal identification, refer to Electrical Center Identification Views in Wiring Systems.
Does the test lamp turn ON and OFF when commanded? | -- | |||
6 | Probe the ignition feed circuit at the underhood electrical 2 with the test lamp J 35616-200 connected to ground. Is the test lamp illuminated? | -- | ||
Does the relay turn ON when the circuit is grounded and OFF when the circuit is opened? | -- | |||
8 |
Did you find and correct the condition? | -- | ||
9 |
Did you find and correct the condition? | -- | ||
10 | Repair the faulty relay control circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
Repair the faulty relay ignition feed circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | ||
12 | Replace the relay. Refer to Secondary Air Injection Pump Relay Replacement . Is the action complete? | -- | -- | |
|
Important:: Program the replacement PCM. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Is the action complete? | -- | -- | ||
Does the scan tool indicate that this test passed? | -- | |||
15 | Select the Capture Info option and the Review Info option using the scan tool. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to the applicable DTC table | System OK |
