For 1990-2009 cars
Engine Controls Components
Cell 20: Generator, Oil Level Switch, EBTCM
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

### Circuit Description

The PCM uses the Output Driver Modules (ODMs) to turn ON many of the current-driven devices that the system needs to control various engine and Transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON.

Unlike the Quad Driver Modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. DTC P1653 set indicates an improper voltage level has been detected on the low engine oil level lamp control circuit.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

• | An improper voltage level has been detected on the low engine oil level lamp control circuit.

• | Above conditions for at least 30 seconds.

### Action Taken When the DTC Sets

The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

### Conditions for Clearing the MIL/DTC

• | The DTC becomes history when the conditions for setting the DTC are no longer present.

• | The history DTC clears after 40 malfunction free warm-up cycles.

• | The PCM receives a clear code command from the scan tool.

### Diagnostic Aids

Check for the following conditions:

• | Poor connection at the PCM.

| Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.

• | Damaged harness.

| Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a digital multimeter connected between the low engine oil level lamp control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the instrument panel. A change in voltage will indicate the location of the malfunction.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help you determine how often the condition that caused the DTC to set occurs. This may assist you in diagnosing the condition.

### Test Description

The numbers below refer to the step numbers on the Diagnostic Table.

1. Normally, the ignition feed voltage should be present on the control circuit with the PCM disconnected and the ignition turned ON.

2. This step checks for a shorted component or a short to B+ on the control circuit. Either condition would result in a measured current of over 500 milliamps. Also checks for a component that is causing an open circuit while being operated, resulting in a measured current of 0 milliamps.

3. This step checks for a short to voltage on the control circuit.

4. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

#### DTC P1653 - Engine Low Oil Level Lamp Control Circuit

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check
2 |

1. Turn OFF the ignition.
2. Disconnect the PCM.
3. Turn ON the ignition.
4. Use a J 39200 Digital Multimeter in order to measure the voltage between the engine low oil level lamp control circuit at the PCM harness connector and ground.

Is the voltage near the specified value?

B+

Go to Step 3

Go to Step 6

3 |

1. Connect the J 39200 DMM to measure current between the engine low oil level lamp control circuit at the PCM harness connector and ground.
2. Monitor the current reading on the J 39200 DMM for at least 2 minutes.

Does the current reading remain between the specified values?

0.05-0.5 Amps

(50-500 mA)

Go to Step 11

Go to Step 4

4 |

1. Turn OFF the ignition.
2. Disconnect the instrument panel (leave the PCM disconnected).
3. Turn ON the ignition.
4. Measure voltage between the engine low oil level lamp control circuit and ground using a J 39200 DMM.

Is voltage at the specified value?

0 V

Go to Step 10

Go to Step 5

5 | Locate and repair short to voltage in the engine low oil level lamp control circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | Go to Step 15 | --
6 | Check the ignition feed fuse for the instrument panel indicators. Is the fuse blown? | -- | Go to Step 7 | Go to Step 8
7 |

1. Locate and repair short to ground in ignition feed circuit for the instrument panel indicators. Refer to Wiring Repairs .
2. Replace fuse if necessary.

Is the action complete?

--

Go to Step 15

--

8 |

1. Disconnect the instrument cluster.
2. Turn ON the ignition.
3. Measure voltage between the ignition feed circuit for the instrument cluster indicators and ground.

Is the voltage near the specified value?

B+

Go to Step 9

Go to Step 13

9 |

1. Check the engine low oil level lamp control circuit for an open or a short to ground.
2. If you find a problem, repair as necessary. Refer to Wiring Repairs in Wiring Repairs.

Did you find a problem?

--

Go to Step 15

Go to Step 10

10 |

1. Check the engine low oil level lamp control circuit and the instrument panel indicators ignition feed circuit for a poor connection at the instrument panel and at the PCM.
2. If a problem is found, repair as necessary. Refer to Intermittents and Poor Connections Diagnosis and Repairing Connector Terminals .

Did you find a problem?

--

Go to Step 15

Go to Diagnostic System Check - Instrument Cluster .

11 |

1. Turn OFF the ignition.
2. Reconnect the PCM.
3. Disconnect the instrument cluster.
4. Turn ON the ignition.
5. Connect a J 35616-200 test lamp between the engine low oil level lamp control circuit and the ignition feed circuit at the instrument panel harness connector.
6. Using the scan tool outputs test function, cycle the engine low oil level lamp ON and OFF.

Does the J 35616-200 test lamp flash ON and OFF?

--

Go to Diagnostic Aids

Go to Step 12

12 |

1. Check the engine low oil level lamp control circuit for a poor connection at the PCM.
2. If you find a problem, repair as necessary. Refer to Intermittents and Poor Connections Diagnosis and Repairing Connector Terminals .

Did you find a problem?

--

Go to Step 15

Go to Step 14

13 | Locate and repair open in the ignition feed circuit to the I/P indicators. Refer to Wiring Repairs . Is the action complete? | -- | Go to Step 15 | --
14 | Important: The replacement PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Is the action complete? | -- | Go to Step 15 | --
15 |

1. Review and record the scan tool Fail Records data.
2. Clear the DTCs.
3. Operate the vehicle within Fail Records conditions.
4. Monitor Specific DTC info for DTC P1653 until the DTC P1653 test runs, using a scan tool.

Does the scan tool indicate DTC P1653 failed this ignition?

--

Go to Step 2

System OK