Circuit Description
The ENG IGN 1 fuse supplies a battery voltage directly to the AIR Pump relay coil. 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 integral bypass valve. This allows the PCM driver to only have to control the relatively low current used by the relay.
Conditions for Setting the DTC
| • | Engine speed is greater than 600 RPM. |
| • | The PCM detects that the commanded state of the driver and the actual state of the control circuit do not match. |
| • | Condition exists for a minimum of 10 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
AIR Pump Relay Terminal Identification | |||
|---|---|---|---|
Front of Vehicle | |||
Left Side of Vehicle | Ignition | B+ | Right Side of Vehicle |
Load | Control | ||
If you can not find a problem with the ignition feed circuit to the component, inspect the circuit between the IGN 1 mini relay and the fuse for an open. Probe both sides of the ENG IGN1 fuse in order to determine if the IGN 1 mini relay is suppling power to the fuse. Refer to Ignition Relay Diagnosis for further diagnosis of the IGN 1 mini relay. Also inspect the IGN 1 fuse for being open.
If the ENG IGN 1 fuse is open or the IGN 1 mini relay is faulty, the following DTCs may set:
| • | P0102 |
| • | P0412 |
| • | P0418 |
| • | P0443 |
| • | P0740 |
| • | P1860 |
This DTC will not report a pass. The scan tool status for this DTC will never report a pass so it would appear that the diagnostic never runs. This causes the MIL to remain ON until a DTC clear command or battery disconnect occurs.
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 check 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 relay coil terminals in order to avoid improper diagnosis.
-
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.
-
This DTC will not report a pass. The scan tool status for this DTC will never report a pass. The scan tool will only display when the diagnostic fails. 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? | -- | |||
Does the current draw measure less than the specified value shown (but not 0)? | 0.75 A | Go to Diagnostic Aids | ||
4 |
Does the DMM display infinite resistance? | -- | ||
Is the test lamp turn ON and OFF when commanded? | -- | |||
6 | Probe the ignition feed circuit at the underhood electrical center with the test lamp J 35616-200 connected to ground. Refer to Diagnostic Aids for terminal identification. Is the test lamp illuminated? | -- | ||
7 |
Does the relay operate? | -- | ||
8 | Check the connections at the relay. Did you find and correct the condition? | -- | ||
9 | Check the connections at the PCM. Did you find and correct the condition? | -- | ||
10 | Repair the faulty relay control circuit. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | -- | |
11 | Repair the faulty relay ignition feed circuit. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | -- | |
12 | Replace the relay. Is the action complete? | -- | -- | |
|
Important:: Program the replacement PCM. Refer to Powertrain Control Module/Throttle Actuator Control Module Replacement . Replace the PCM. Is the action complete? | -- | -- | ||
Does the scan tool indicate that this test failed? | -- | |||
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 |
