DTC P1107 Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent Low Voltage. Cadillac Concours 1996

For 1990-2009 cars
Engine Controls Components
IAT/ ECT/ TP/ MAP and BBV Sensors
OBD II Symbol Description Notice
ESD Notice
ESD Notice

### Circuit Description

The Manifold Absolute Pressure (MAP) sensor is a sensor that changes resistance based upon manifold vacuum. The PCM provides a 5 volt reference and ground. The MAP sensor signal varies between ground and 5 volts as manifold vacuum varies. As MAP decreases, voltage decreases (low engine load, high vacuum). As MAP increases, voltage increases (high engine load, low vacuum). The PCM uses the MAP sensor values as an indicator of engine load. DTC P1107 sets when the PCM detects a MAP sensor signal that is too low.

### Conditions for Setting the DTC

#### Test Conditions

• | DTC P0107, P0108, P0122 and P0123 not set.

• | Engine speed 700 RPM or less and throttle angle 18 degrees or less and transaxle in Park or Neutral.

OR

• | DTC P0107, P0108, P0122 and P0123 not set.

• | Engine speed 1800 RPM or less, throttle angle 13 degrees or greater and transaxle in Drive or Reverse.

#### Failure Condition

The MAP sensor reading has been 0.08 volts or less.

### Action Taken When the DTC Sets

• | The Malfunction Indicator Lamp (MIL) will not illuminate.

• | No message will be displayed.

### Conditions for Clearing the DTC

• | A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.

• | A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.

• | Use a scan tool to clear DTCs.

• | Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation.

### Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

1. If DTC P0106 or P0107 are also set, diagnose them first because it may help to diagnose an intermittent MAP sensor.

2. Checking for intermittent terminal contact at the fuel rail connector. Checking for intermittent terminal contact at the PCM.

3. Checking for intermittent terminal contact at the MAP sensor.

4. Checking for intermittent circuit faults that may cause a low MAP reading.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to A Powertrain On Board Diagnostic (OBD) System Check
2 | Turn the key ON. Is DTC P0106 or DTC P0107 also set? | -- | Go to DTCs that are set | Go to Step 3

3

1. Turn the key to OFF.
2. Disconnect the fuel rail connector.
3. Examine terminals M, R and S of both halves of the connector.
4. Repair terminal contact if needed.

Was terminal contact repaired?

--

Go to Powertrain Control Module Diagnosis for Verify Repair

Go to Step 4

4

1. Record the fluid life indexes, turn the key to OFF and wait 30 seconds.
2. Disconnect PCM connector C1.
3. Examine terminals 46, 64 and 69 of C1.
4. Repair terminal contact repaired.

Was terminal contact repaired?

--

Go to Powertrain Control Module Diagnosis for Verify Repair

Go to Step 5

5

1. Disconnect MAP sensor connector.
2. Examine all MAP sensor terminals.
3. Repair terminal contact if needed.

Was terminal contact repaired?

--

Go to Powertrain Control Module Diagnosis for Verify Repair

Go to Step 6

6 | Check the MAP sensor 5 volt reference circuit and MAP sensor signal circuit for an intermittent open or short to ground. Are any circuit failures found and repaired? | -- | Go to Powertrain Control Module Diagnosis for Verify Repair | Fault not present. Go to DTC P0106 Manifold Absolute Pressure (MAP) System Performance