P1130

Circuit Description
The Engine Control Module (ECM) monitors the Oxygen Sensor (O2S) to determine the time taken for the O2S to become active after a cold start. The ECM supplies a reference voltage of about 4.5 volts to the O2S. During the monitoring period, the ECM measures the elapsed time taken for the O2S output voltage to vary by ±0.126 volts from the mean bias voltage (0.45 volts). With this information, the ECM can determine if the O2S is functioning properly and has become active within the specified time limit. If too much time is needed for the O2S output voltage to vary, DTC P1130 will be set.

Conditions for Setting the DTC
- Start up Engine Coolant Temperature (ECT) is less than 90 °F (32 °C).
- Start up Intake Air Temperature (IAT) is less than 90 °F (32 °C).
- Difference between the start up ECT and IAT is less than 45 °F (7 °C).
- Voltage before start is between 11 and 16 volts.
- O2S 1 output voltage with ignition ON is between 400 and 500 millivolts.
- Throttle Position (TP) Sensor is less than 50%.
- DTCs P0131, P0132 and P0134 are not set.
- Average air flow is greater than 1 g/sec.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the freeze frame and failure records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF after three consecutive ignition cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm-up cycles without a fault.
- The DTC(s) can be cleared by using the scan tool.

Diagnostic Aids
Check for a poor connection or damaged ECM harness.

Inspect the O2S sensor signal circuit and ground circuit terminals for the following conditions:
- Improper mating.
- Broken locks.
- Improperly formed.
- Damaged terminals.
- Poor terminal-to-wire connection.
- Damaged harness.

Steps 1 - 6:

Steps 7 - 12:

Test Description
The number(s) below refer to step(s) on the diagnosis table.
1. On-Board Diagnostic (OBD II) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
2. Make sure DTCs P0131, P0132 and P0134 are not set.
3. If the O2S pigtail wiring, connector or terminals are damaged, the entire O2S assembly must be replaced. Do not attempt to repair the wires, connector or terminals. For the sensor to function properly, a clean air reference must be provided to it. This clean air reference is obtained through the O2S wire(s). Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade O2S performance. An intermittent may be caused by a poor connection, rubbed-through wire insulation or a wire broken inside the insulation.
9. Perform an intermittent test. If the connections and the harness check OK, monitor a Digital Voltmeter (DVM) connected between the ECT sensor signal circuit and ground circuit terminals while moving the related connectors and the wiring harness. If a fault is induced, the resistance reading will change. This may help to isolate the location of the malfunction.
10. The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for reprogramming the ECM.