P0107-MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
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When Monitored:
Engine speed between 600 to 3500 RPM. Battery voltage greater than 10 volts.
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Set Condition:
The MAP sensor signal voltage is below 0.08 of a volt for 3.0 seconds. One Trip Fault. Three good trips to turn off the MIL. MIL will illuminate and the ETC light will flash if equipped.
Possible Causes
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(F856) 5-VOLT SUPPLY CIRCUIT OPEN
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(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
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(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND
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(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
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MAP SENSOR
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PCM
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Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1.
MAP SENSOR VOLTAGE BELOW 0.08 OF A VOLT
Ignition on, engine not running.
With a scan tool, read the MAP Sensor voltage.
Is the voltage below 0.08 of a volt?
Yes
No
2.
(F856) 5-VOLT SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.
Is the voltage between 4.5 to 5.2 volts?
Yes
No
3.
MAP SENSOR
With a scan tool, monitor the MAP Sensor voltage with the Sensor harness connector disconnected.
Is the voltage above 4.5 volts?
Yes
No
4.
(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.
Is the resistance below 100 ohms?
Yes
No
5.
(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
Measure the resistance between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit in the MAP Sensor harness connector.
Is the resistance below 100 ohms?
Yes
No
6.
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the C1 PCM harness connector.
CAUTION:
Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller
Special Tool #8815 to perform diagnosis.
Measure the resistance of the (F856) 5-volt Supply circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
No
7.
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (F856) 5-volt Supply circuit in the MAP Sensor harness connector.
Is the resistance below 100 ohms?
Yes
No
8.
PCM
NOTE:
Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
Were there any problems found?
Yes
No